Pocket-Hole Jig

identity

Name: Pocket-hole jig (also "pocket screw jig"). "Kreg" and "Kreg Jig" are trademarks of Kreg Tool Company, not the generic name for the category.

Family: Hidden-fastener joinery jigs. A clamp and drill-guide fixture that steers a stepped drill bit through a workpiece at a shallow oblique angle to bore a pilot path with a wider seat for the screw head. A compatible pocket screw is then driven through that board into a second board, with the head sitting inside the pocket. The exact angle, bit, seat shape, setup, screw and plug belong to the named system. Many Kreg jigs use about 15 degrees; other systems differ (Castle advertises a shallower geometry, about 6 degrees). Do not assume bits, guides, screws or plugs transfer between brands or machine types.

One line: A clamp-and-guide fixture that lets an ordinary drill and a matched screw make a fast, mostly hidden butt joint, the mechanized descendant of a trick furniture makers chopped by hand long before.

how NOT to use it

not-for

• Load-bearing or code-regulated connections (see matching). No explicit building-code section naming pocket-hole screws was located by either the first pass or this one; the rule is "needs an approved design," not "a code bans it."
• Chair frames and other racking or repeated-load joints where the maker of the independent test warns that screw joints may be a poor choice. Woodgears: "for furniture applications where strength is critical, screw joints should be avoided... you shouldn't rely on screws to hold a chair frame together" (quoted in the first pass [R26]; not re-read by Hewn).
• Outdoor use with the wrong screw coating. One long-time user reports a failure where the wood around the pocket rotted [R13]. Kreg's Blue-Kote screws are positioned by the maker for damp or wet service and treated material; that does not make them structural fasteners [R42].
• Plywood sheet edge-to-edge splices through end grain, per the RV forum caution [R14].

damaging

• Over-tightening can strip the pocket; a stripped pocket will not return to full holding strength (field fix: glue and toothpick, lower the clutch) [R29].
• A screw too long for the stock can come out the far face; setting the collar to nominal rather than measured thickness is a documented cause [R29].
• Wrong screw: a general wood or drywall screw can pull into the pocket or split the board [R14, R29]. Follow the screw rule in anatomy.
• Pocket too close to an edge can crack the wood; follow the minimum edge distance in the jig's manual (the first pass cited roughly 3/4 inch from a Kreg source [R29]; not re-verified).
• Bushing wear is a contested forum point; one view blames bushing wear, another a dull bit run too slowly (Kreg suggests 1,800 RPM or more, per the forum [R30]). Held open.
• In the Woodgears maple test, one joint failed with the wood around the pockets splitting [R26]. Failure can be the wood, not the screw.

beginner traps

• Not clamping tightly; trying to align by hand while driving. Several named readers describe boards creeping under screw torque [R31].
• Glue: see the glue note below. Edge-to-edge panels without glue can open a gap with seasonal movement [R29].
• End grain, corrected. The point is where the screw gets its holding, not where the pocket is drilled. Many normal pockets are drilled through the end region of one board; the screw must hold in the mating board's favorable grain. End-grain screw withdrawal is generally weak (the "box of drinking straws" picture from Kreg's teaching voice [R29] is a useful image). Arrange the joint so the screw bites across long or face grain, and validate unusual orientations.
• Reusing a removed pocket screw without accounting for lost purchase, especially on knock-down furniture [R32].
• MDF: use the current selector (coarse thread), conservative driving torque, enough edge distance, sound material, and adhesive where the joint has suitable bonding surfaces. Glue does not rescue a poor screw connection. One Kreg FAQ page appears inconsistent on MDF thread choice, per the reviewer [R43]; follow the current selector and manual.

glue note. Whether glue helps depends on species, grain direction, fit, bonding area, adhesive, cure, environment and load. In the one Woodgears test configuration, glue changed the pocket-joint result little (see test below). That does not make glue optional in general. Joint design and the project's requirements decide.

strength: one independent test, bounded

• Source: Matthias Wandel, Woodgears.ca, "Testing pocket holes against mortise and tenon and dowel joints" [R26].
• As summarized by search results of that page: pocket-hole joints (no glue) failed completely at 95, 120, 75 and 105 pounds, average 99; dowel joints at 160, 160 and 149 pounds, average 156; mortise and tenon with yellow glue about 235, with Titebond III about 202, with epoxy about 236. The maker's reading is that mortise and tenon joints were about twice as strong as the pocket holes in this test, and that the pocket joints opened partially at much lower loads than complete failure.
• Carried from the first pass, not re-checked: a glued retest averaged 111 pounds, with the conclusion that glue did not make these pocket-hole joints stronger; partial opening began near 50 pounds; one maple joint failed at 220 pounds with the pockets splitting.
• Not verified by Hewn: specimen material and dimensions, joint geometry, load direction, test rig and sample count. These must be read from the source page before the numbers are reused. Until then the numbers apply only to that one small test and cannot rank all pocket-hole, dowel and mortise-and-tenon joints.
• Deleted: the first-pass "Rockler 707 pound" figure. It came from a secondary aggregator with no method or specimen description, and it is not carried.

correct use

What it is good at. A fast, hidden-fastener butt, T, edge, box, corner or mitered-frame joint with only a drill and a clamp, where the pocket can sit on a back, underside or interior face: face frames, cabinet and bookcase boxes, shelves, drawer boxes, repairs, shop fixtures, and many non-structural furniture parts.

How to use it well (short version; the workbench holds the deep operation). Follow the manual for your model.

• Clamp the jig to the work. Never hold the jig or the joint by hand while drilling or driving.
• Measure the actual stock thickness and set both the jig and the stop collar to it.
• Choose the screw for the jig, stock and exposure (see anatomy).
• Orient the joint so the screw gets good purchase in the mating member. Normally that means across long or face grain, not relying on weak end-grain withdrawal. Do not judge suitability by where the pocket is visible. Follow the jig maker's joint diagrams and test unusual orientations on scrap.
• Clamp the joint so it cannot shift under screw torque; set the drill clutch so you do not overdrive.

matching: the workbench's first read

does: Cuts an angled pocket (pilot path and head seat) in one workpiece so a compatible pocket screw fastens it to a mating workpiece, giving a mostly hidden joint. Needs a drill (or a model with one built in), clamps, matched bit and screws. No milling machine, router table or mortise cutter [R25].

suits (strong matches): face frames; cabinet and bookcase boxes; shelves; drawer boxes; non-structural repairs; edge banding; shop fixtures; mitered frames; concealed-side assembly, where the chosen jig, screw, stock, load and finish requirements fit.

conditional matches (need material-specific screw choice, edge distance, clamping, glue and finish decisions, and honest load and appearance limits): edge-to-edge panel assembly; outdoor furniture (a non-building use, with the correct coated or stainless screw, drainage, finish and joint design); RV and trailer interior cabinetry; plugged pockets on a visible face; thin stock; MDF; hardwood; repeated production.

model-specific matches: Micro for smaller pockets and thinner work as its manual permits; XL for its named 2x4 and 4x4 setup with XL bit and screws; 720 for benchtop automatic clamping; Foreman, Rebel and industrial machines as powered machines with their own manuals.

route elsewhere, or require design authority: The XL makes larger pocket holes in 2x4 and 4x4 stock for suitably designed large projects. For any load-bearing, code-regulated, exterior, guard, stair, wall, deck or post connection, use only a connection and fastener schedule accepted by the applicable code, engineered design, manufacturer approval and local authority. "Fits the lumber" is not structural approval. This covers load-bearing walls, decks and deck framing, guards and railings, stairs, posts, structural fence elements, overhead support, lifting and joints that carry a person. Do not match this tool to those on size alone.

Why the line is drawn here, from real sources:

• Kreg's own page for the discontinued Kreg Jig HD, a heavy-stock predecessor of the XL, said to check with your local building code authority before using it to build load-bearing objects such as interior walls or deck railings, because codes differ by area (Kreg HD discontinued-product page [R21]; wording confirmed by a search summary of that page).
• Under the International Residential Code, guards are structurally designed for the load in Table R301.5, commonly summarized as 200 pounds applied in any direction at the top, with section R312 covering guards (summaries from municipal and trade-press pages found by search: Lake Stevens WA guardrail handout, Seattle-area permit tip sheet TS 03 Residential Guardrails, Fine Homebuilding/JLC trade articles; none opened by Hewn because the network blocked them, so section numbers and load figures are not verified here against the code text). The point stands without the exact figures: guard-post connections are designed and inspected under the adopted local code, and tool marketing and a generic break test cannot approve one. Check your own jurisdiction's adopted code and building department.

pairs with: suitable drill/driver; sharp compatible bit; correctly set collar; correct pocket screws; clamps and workholding; thickness gauge; square and alignment checks; compatible plugs where appearance permits; dust extraction; required PPE. Wood glue where the joint design calls for it (edge-to-edge glue-ups, many joints with good bonding surfaces); see the glue note.

substitutes for: dowels, biscuits, loose tenons, housed joinery, confirmat screws, brackets or connectors, mortise and tenon, depending on alignment, strength, appearance, reversibility, production needs and code. These are not interchangeable strength classes.

not for: see next section.

appearance: Pockets are usually placed on a back, underside or interior face. Where that is impossible, compatible plugs (Kreg sells plugs and a custom plug cutter) can reduce visibility, but they may remain unsuitable for a continuously visible or finish-critical surface [R41].

access: Widely marketed and used as an accessible drill-and-screw joinery system. Ease depends on setup, stock, clamping, screw selection, finish expectations and the builder's access. The market scale is not quantified in any source consulted.

revival: It lets a first-time builder attempt cabinets, bookcases and tables without a milling setup. Named users describe workbenches and furniture they would not otherwise have started.

anatomy

• Clamping. Varies by model. Entry jigs (310, 320, R3 class) have no integrated clamp; the user supplies one against the anti-slip base [R17]. The K4 has a rear toggle clamp. The K5 added a front ratcheting clamp [R18]. On the 720, Automaxx automatically clamps the workpiece and sets jig height for 1/2 to 1-1/2 inch stock; it does not complete the setup. The drill-bit stop collar still has to be set to the material thickness, and screw choice is still the user's job [R7, R37].
• Guide block and bushings. Hold the bit at the model's built-in angle so it cannot flex off-line, the failure named in Sommerfeld's patent text [R4].
• Stepped bit. One plunge cuts a narrower pilot path and a wider seat for the screw head. Exact dimensions vary by jig class (Micro, standard, XL). No primary dimension chart was verified, so none is quoted.
• Stop collar. Set on the bit to the workpiece's actual measured thickness (3/4 inch plywood often measures thinner). Wrong setting is the common cause of breakthrough or a poorly seated screw.
• Screws. Use the screw specified for the jig, the stock thickness and material, the head-seat geometry and the exposure. Kreg pocket-hole screws use self-tapping points and model-specific head, thread, length and coating combinations. Do not substitute drywall screws or unapproved general screws just because length or shank looks similar. Per Kreg's current selector as relayed by the reviewer [R20, R39]: coarse thread for softwood, plywood, MDF and other sheet goods; fine thread for hardwood; washer or Maxi-Loc heads for most uses, pan heads for dense hardwood or thin stock; zinc for indoor, Blue-Kote for damp or wet, stainless for the harshest exposure. The selector page itself was not opened by Hewn. Always check the current selector and manual for the actual stock and thickness.

variations (living, dated snapshot 2026-10-03; not complete)

• Pocket-Hole Jig 310: single hardened-steel guide, entry level.
• Pocket-Hole Jig 320: two separable guide units with a removable spacer, allowing variable spacing and two registered hole positions. Holes are drilled one after the other with a single drill bit. One drill bit and one driver bit are included. Capacity per Kreg, 1/2 to 1-1/2 inch stock [R17, R40].
• Micro: smaller pocket for smaller, thinner or narrower work, as its own manual permits.
• XL (KPHJ920): intended for 2x4 and 4x4-class work, with 1-1/2 inch and 3-1/2 inch setup positions, and the matching XL bit and XL screws. No continuous intermediate capacity is claimed; follow the XL manual for any other thickness. It replaced the discontinued Kreg Jig HD [R21, R22]. See the structural limit below.
• K4: three-hole guide, rear toggle clamp, 1/2 to 1-1/2 inch. Currently sold (see history).
• 520PRO2, 720, 720PRO: built-in or auto-adjusting clamps; the 720 line has integrated chip collection.
• Rebel (cordless, drill built in), Foreman (benchtop powered): powered machines with their own manuals and hazards.
• Other makers (Massca, Milescraft, General Tools, UJK, Benchdog) exist; reviewer opinion that cheaper clones need more user skill is opinion, not measured.
• Castle TSM-series: industrial foot-pedal machines, a different branch.

Prices change. One shopping snapshot, from a search summary of Kreg's store on 2026-10-03 and not opened at the source: K4 about $99.99, K4 Plus about $124.99, K4 System about $139.99 (USD, Kreg store). Treat as volatile, not tool identity.

trades

• DIY and hobby furniture and cabinets; the largest visible user base.
• Cabinetmaking and production shops (face-framing equipment exists); also where the "is this cheating" debate is sharpest.
• RV, trailer and marine interior building (forum evidence).
• Industrial cabinet and furniture manufacturing, served by a parallel Castle branch.
• Outdoor furniture, as a conditional non-building use. Building framing is not listed here; see matching.

lineage

Ancestors

• Hand-chopped pocket screws, the technique, far older than the jig. Furniture historian Will Myers documents pocket screws in a Shaker side table dated to roughly 1840 (Hancock Shaker Village) and points to earlier Federal-period casework, including pieces attributed to Thomas Seymour. Before any jig, the pocket was chopped by hand with an incannel gouge, described as coarse, its floor typically 3/4 inch to 1 inch below the top edge of the rail [R1, read in the first pass]. These are documented examples, not the earliest known instances. The modern jig mechanized and standardized a hand technique; it did not invent pocket-screw joinery.
• West Products, drill-press fixture. US 4,466,601, "Holding fixture for drilling oblique holes," James G. Raines, assigned to West Products, continuation of an application first filed May 6, 1982. It clamped to a drill-press table [R2].
• West Products, hand-drill successor. US 4,842,453, "Guide apparatus for drilling oblique holes," Raines and Harry Coleman, filed Nov. 26, 1986, granted June 27, 1989. Its background says the earlier fixture "can only be used in conjunction with a drill press, making it unsuitable for those hobbyists... who do not wish to go to the expense of purchasing one," and the patent exists to allow the same oblique-hole job with an ordinary hand drill [R3]. These two patents are a documented West Products sequence, because the later one expressly discusses the earlier fixture.
• Sommerfeld's patent, a parallel entry in the same problem field. US 4,955,766, "Holding fixture for drilling pocket joints," Craig A. Sommerfeld, filed Nov. 6, 1989, granted Sept. 11, 1990. Its background says known devices include "complex specialized equipment that is expensive to acquire and maintain" and allow a spacing between guide and workpiece that lets the bit "flex or 'walk,' which causes erratic cutting and damage to the bit" [R4]. Its aims are a device usable with an ordinary hand drill, affordable, and precise. No consulted source proves that Sommerfeld knew of, licensed, or descended from the West Products work. Treat the three patents as an overlapping, parallel patent history unless a citation, assignment or other documentary link is found. The shared theme is useful: each patent names a failure of earlier practice (drill-press dependency, then bit walk).

Descendants and contemporaries

• Sommerfeld adjustable-jig family. US 6,481,937 and US 6,726,411, "Adjustable holding device," Craig A. and Todd Sommerfeld, granted 2002 and 2004; US 8,231,313, "Adjustable holding systems," Craig A. Sommerfeld and Scott L. Clark, granted July 31, 2012 [R5].
• US RE44289 E1, "Pocket hole drilling machine," a reissue originally credited to Joon Park (priority June 23, 2004, reissued June 11, 2013). It is currently assigned to Kreg Enterprises, Inc. The consulted record does not establish the transfer terms, the date or reason of transfer, or the final resolution of Park's litigation [R6]. Its background names the foot-switch and fixed-depth limits of industrial pocket-hole machines as what it improves on.
• Castle, Inc. (founded 1985, per its own about page as summarized in the first pass) makes foot-pedal production machines (TSM series, CSI 1.5D screw inserter) for cabinet, furniture, RV, marine and modular work, using a shallower angle than Kreg [R9]. A parallel branch, not a descendant.
• Siblings for comparison: the biscuit joiner, the Domino Joiner and the Electric Dowel Joiner solve a related fast-assembly problem by other mechanisms.

history

Origin. Per Kreg's own company history page, tool-and-die maker Craig Sommerfeld, building kitchen cabinets at home in 1986, built a U-shaped single-hole aluminum jig to hide face-frame screws, and sold it at woodworking shows. The company was formally founded in 1989 [R10]. Every source located agrees on 1989; no source supports 1988.

Product milestones, company-sourced unless noted [R10]: 1995 Kreg Jig on a Wood magazine cover (not independently verified); 2000 K2000, injection-molded body; 2003 national distribution through Lowe's; 2005 K3.

Current product timeline, as a dated snapshot, not a break. Kreg introduced the 520/720 generation with Automaxx clamping around 2021 (trade coverage, ToolGuyd [R8]). Kreg lists the K5 as discontinued (Kreg discontinued-products page, per the reviewer's source notes [R38]). K4 products are on sale as of 2026-10-03 (a search summary of kregtool.com showed the K4, K4 Plus and K4 System listed and in stock; the reviewer's note says Kreg's K4 page said "In Stock" on 2026-07-30 and a 2025 K4 manual exists). The first-pass claim that Kreg discontinued the whole K4/K5 line in 2021 is withdrawn. Whether the K4 was ever briefly withdrawn or reintroduced is not resolved; no dated company announcement was found. Kreg's own K4 page and manual were not opened by Hewn.

Museum record. None located for an early pocket-hole jig, an industrial pocket-boring machine, or an accessioned hand-chopped pocket joint. Named as a gap.

human side

Is it "real" woodworking? Named readers, in their own words (Woodworker's Journal, "Pocket-Hole Pros and Cons" [R13]). This is cultural evidence only. It carries no mechanical, structural or safety conclusion.

• Andrew Dugas: "Pocket holes are excellent for a contractor... When building custom furniture or cabinetry, take the time. Do it right using mortises and tenons, lap joints and dovetails."
• Dan Larson: "I'm personally not fond of pocket screws because it feels like cheating," while still using them on a paid cabinet job.
• Jack Binder: "Pocket-hole joints are quick, strong and easy. They're also ugly."
• Doug Johnston: "...they are a legitimate means of joining wood. And that definitely qualifies as woodworking."
• John Weeder: "Don't let wood snobs dampen the enthusiasm of those who do not have the time, experience or the desire to hand cut dovetails... Pocket screws are no more of a cheat than a Domino, biscuit joiner or a dovetail jig for a router."
• Keith Mealy builds 1,100 to 1,600 utility tables a year for a charity, joining aprons to tops with pocket screws at roughly 5,000 screws a month: "Never had a call-back." One maker's account of one product, not a test.
• Steve Dragg, cautionary: a shop cart with butt joints reinforced only by pocket screws "slipped coming down the truck ramp, hit the bottom and exploded... I'd still have that cart if I had used proper joinery and glue."

RV and trailer builders use pocket screws for interior frames, bulkheads, cabinet faces and shelving (forum thread [R14]); the same thread has a builder warning against pocket screws into the end grain of spliced plywood, recommending biscuits or splines.

Production shops. Kreg sells a 4 by 8 foot face-framing table for production face frames [R15].

Teaching voice. Jeff Devlin, a carpenter and TV host, fronted Kreg's marketing and tutorials; several readers credit him by name [R13, R16]. There is no independent craftsman authority here separate from the maker's own marketing.

proof of existence

• Patents read in the first pass: US 4,466,601 [R2]; US 4,842,453 [R3]; US 4,955,766 [R4]; US RE44289 [R6].
• Two federal dockets, kept as proof of disputes and patent enforcement only. They do not measure sales, adoption or importance.
  • Park v. CAS Enterprises, Inc. dba Kreg Tool Company, No. 08-cv-0385 DMS (NLS), S.D. The reviewer., filed Feb. 2008; a June 10, 2010 order addresses summary judgment on Claim 5 of US 7,374,373 [R34, R35]. The reissue US RE44289 is now assigned to Kreg; transfer terms and final resolution are not established.
  • Kreg Enterprises, Inc. v. Armor Tool, LLC, No. 3:19-cv-01125-BAS-WVG, S.D. The reviewer., filed June 17, 2019, alleging infringement of US 8,231,313 and Design Patent D840,803. Final outcome not located [R36].
• Commercial scale is not quantified. No dated sales data, trade catalogue count, survey or production-machine census was found. Adoption is shown only qualitatively (readers, forums, a commercial face-framing table).
• No museum or collection holding located.

references

Carried from the first pass (R1 to R36), with the changes stated. New entries are R37 to R43.

• [R1] Will Myers, "A New Old Idea: Pocket Screws," Lost Art Press, Feb. 21, 2018, https://blog.lostartpress.com/2018/02/21/a-new-old-idea-pocket-screws/
• [R2] US 4,466,601, "Holding fixture for drilling oblique holes," Raines, https://patents.google.com/patent/US4466601A/en
• [R3] US 4,842,453, "Guide apparatus for drilling oblique holes," Raines and Coleman, https://patents.google.com/patent/US4842453A/en
• [R4] US 4,955,766, "Holding fixture for drilling pocket joints," Sommerfeld, https://patents.google.com/patent/US4955766A/en
• [R5] Justia Patents, Craig A. Sommerfeld inventor page, https://patents.justia.com/inventor/craig-a-sommerfeld
• [R6] US RE44,289 E1, "Pocket hole drilling machine," Park, https://patents.google.com/patent/USRE44289E1/en
• [R7] Kreg, jig comparison page, https://learn.kregtool.com/learn/pocket-hole-jigs/
• [R8] ToolGuyd, "A New Generation of Kreg Pocket Hole Drilling Jigs (2021)," https://toolguyd.com/kreg-pocket-hole-drilling-jigs-2021/
• [R9] Castle, Inc., Pocket Cutters category page, https://castleusa.com/categories/machines-and-tables/pocket-cutters.html
• [R10] Kreg, company History page, https://learn.kregtool.com/about/history/
• [R13] Woodworker's Journal, "Pocket-Hole Pros and Cons," https://www.woodworkersjournal.com/pocket-hole-pros-and-cons/
• [R14] Teardrops n Tiny Travel Trailers forum, "Pocket Hole Jigs," https://www.tnttt.com/threads/pocket-hole-jigs.1045816/
• [R15] Kreg, 4 x 8 Face-Framing Table, https://www.kregtool.com/shop/pocket-hole-joinery/commercial-machines/4-x-8-face-framing-table/KFT4X8.html
• [R16] Jeff Devlin profile, Kreg community site, https://kregjig.ning.com/main/mobilepage/desktopMode?target=%2Fprofile%2Fjeffdevlin
• [R17] Kreg, Pocket-Hole Jig 320 product page, https://www.kregtool.com/shop/pocket-hole-joinery/pocket-hole-jigs/kreg-pocket-hole-jig-320/KPHJ320.html
• [R18] Kreg K5 Owner's Manual, https://www.kregtool.com/on/demandware.static/-/Library-Sites-RefArchSharedLibrary/default/dwbda477b7/manuals/K5_NA.pdf
• [R20] Kreg, "How to Select the Right Pocket-Hole Screw," https://learn.kregtool.com/learn/how-to-select-right-pocket-hole-screw/
• [R21] Kreg Jig HD discontinued-product page, https://www.kregtool.com/support/faqs-product-info/discontinued-products/kreg-jig-hd/KJHD.html
• [R22] Kreg, Pocket-Hole Jig XL (KPHJ920), https://www.kregtool.com/shop/pocket-hole-joinery/pocket-hole-jigs/kreg-pocket-hole-jig-xl/KPHJ920.html
• [R25] Kreg, "Make 7 Simple Joints," https://learn.kregtool.com/learn/7-simple-joints-with-your-kreg-pocket-hole-jig/
• [R26] Woodgears.ca, "Wood joint strength testing," https://woodgears.ca/joint_strength/ and "Testing pocket holes against mortise and tenon and dowel joints," https://woodgears.ca/joint_strength/pockethole.html
• [R27] Saws on Skates, "Advice DIYers Want You to Know About Their Workshop Accidents," https://sawsonskates.com/workshop-accidents/
• [R29] Saws on Skates, "9 Pocket Hole Mistakes You Don't Want to Make," https://sawsonskates.com/pocket-hole-mistakes/
• [R30] SawdustZone, "Pocket hole jig drill bits," https://www.sawdustzone.org/forum/discussions/tool-talk/854110-pocket-hole-jig-drill-bits
• [R31] Saws on Skates, workpiece movement article, https://sawsonskates.com/how-to-prevent-pieces-from-moving-when-assembling-pocket-hole-joints/
• [R32] Saws on Skates, "Easiest Way to Fix a Stripped Pocket Hole," https://sawsonskates.com/fix-stripped-pocket-hole/
• [R34] Business Record, "A pocket (jig) of success," https://www.businessrecord.com/a-pocket-jig-of-success/
• [R35] Leagle, Park v. CAS Enterprises order summary, https://www.leagle.com/decision/infdco20100611b40
• [R36] Justia Dockets, Kreg Enterprises v. Armor Tool, https://dockets.justia.com/docket/california/casdce/3:2019cv01125/633639
• [R37] Kreg, 520/720 FAQ (collar setting separate from Automaxx), https://learn.kregtool.com/kreg-pocket-hole-jigs-520-720-faqs/ (via the reviewer's source note; not opened here)
• [R38] Kreg, Pocket-Hole Jig K5 discontinued-product page, https://www.kregtool.com/support/faqs-product-info/discontinued-products/kreg-pocket-hole-jig-k5/K5.html (via the reviewer's source note; not opened here)
• [R39] Kreg, current screw selector, https://www.kregtool.com/PLP-LB_selecting-the-right-pocket-hole-screw.html (via the reviewer's source note; not opened here)
• [R40] Kreg Pocket-Hole Jig 320 Owner's Manual, https://www.kregtool.com/on/demandware.static/-/Library-Sites-RefArchSharedLibrary/default/dw9c59dc24/manuals/KPHJ320_NA.pdf and Global edition https://www.kregtool.com/on/demandware.static/-/Library-Sites-RefArchSharedLibrary/default/dw95e197b0/manuals/KPHJ320_Global.pdf (safety wording via search summary; PDF not opened here)
• [R41] Kreg, Custom Pocket-Hole Plug Cutter, https://www.kregtool.com/support/faqs-product-info/discontinued-products/custom-pocket-hole-plug-cutter/KPCS.html (via the reviewer's source note; not opened here)
• [R42] Kreg, Blue-Kote Pocket-Hole Screws, https://www.kregtool.com/shop/pocket-hole-joinery/pocket-hole-screws-plugs/blue-kote-pocket-hole-screws/SML-C250B-50.html (via the reviewer's source note; not opened here)
• [R43] Kreg, "Answers to Pocket-Hole Questions," https://learn.kregtool.com/learn/answers-to-pocket-hole-questions/ (via the reviewer's source note; not opened here)
• Kreg K4 listing, https://www.kregtool.com/shop/pocket-hole-joinery/pocket-hole-jigs/kreg-pocket-hole-jig-k4/K4.html, and K4 manual, https://www.kregtool.com/on/demandware.static/-/Library-Sites-RefArchSharedLibrary/default/dw9c8fc95d/manuals/K4_NA.pdf (the search listed this older NK8448 manual; the reviewer cites a 2025 manual, K4_2025.pdf, not opened here)
• Guard design-load summaries (not opened; code text not verified): Lake Stevens WA, "Guardrails Handout," https://www.lakestevenswa.gov/DocumentCenter/View/13261/Guardrails-Handout; "Tip Sheet 03 Residential Guardrails," https://mybuildingpermit.com/sites/default/files/TS_03_Residential%20Guardrails_2021_Final.pdf; International Residential Code Table R301.5 and Section R312, current adopted edition for your jurisdiction.

Dropped from the first pass: R11 (infomercial trade note), R12, R19, R23, R24, R28 (CPSC recall search, removed with the recall claim), R33 (Rockler 707 lb aggregator). The 2008 infomercial sales claim and the price ladder are not carried.

safety first (read before anything else)

This is a powered-drill operation with a sharp bit, a rotating driver, a possible breakthrough or exit point, workpiece movement, noise, chips and wood dust. The manufacturer's manual for your exact model is the rule source. When this entry and the manual differ, the manual wins.

What the Kreg 320 owner's manual requires (per the manual's text as relayed by a search summary of the official PDF, and by the reviewer's source note; the full PDF was not opened by Hewn):

• Follow your drill manufacturer's safety guidelines.
• Always wear eye, ear and respiratory protection designed and certified as safety equipment.
• Handle the sharp bit with care and avoid hand positions that sit in a possible slip path.
• Secure the workpiece.
• "Do not attempt to hold the pocket-hole jig in place with your hand while drilling. Secure it to the workpiece with a clamp."
• Wood dust warning: drilling, sawing, sanding or machining wood can expose you to wood dust, "a substance known to cause cancer"; avoid inhaling it or use a dust mask or other safeguards.

Good-practice steps consistent with those controls (the reviewer's Safety Notes; general shop practice, not a quote of any one manual):

• Disconnect the drill or remove its battery before fitting or adjusting the bit and stop collar.
• Clamp the jig and secure the work. Keep hands out of the bit path, the exit point, and any place a slipping drill or board could go.
• Inspect the bit, guide, collar, driver, clamp, cord or battery and the workpiece before starting. Stop if the bit binds, overheats, is dull or damaged, or the setup shifts.
• Use the drill maker's speed and clutch guidance. Do not operate while impaired.
• A vacuum port or integrated chip collection can reduce debris when connected to a suitable vacuum. It does not eliminate dust exposure and does not remove the need to assess respiratory protection.

Model-specific manuals are required. The XL, Micro, 720, Foreman, Rebel and any production machine have their own manuals and hazards. The XL manual (KPHJ920_Global.pdf, Kreg learn site) is named as the XL setup and safety source; it was not opened by Hewn.

Human-use texture, not a rule source. One named first-person account on a trade blog comment section describes holding a joint by hand while driving a screw: "The driver tip slipped on me and drove into my palm of my hand... Use a clamp to hold together for safety" (comment from "Scott C.", Saws on Skates [R27]). It agrees with the manual's clamping rule. It is an anecdote, not evidence about how common or severe such injuries are.

Structural and code-regulated work is a safety matter too. A jig that drills a bigger pocket in bigger lumber says nothing about allowable load, guard-post resistance, uplift, lateral load, fatigue, wet-service capacity or code acceptance. See the matching block and how NOT to use it.

evidence ledger and unresolved gaps

Read directly in the first pass (Run 261, 2026-07-12): R1, R3, R4, R6, R13 and the Woodgears pages; others consulted. In this fix pass: only search-result summaries could be reached for Kreg's 320 manual, Kreg's HD page, Kreg's K4 listing, the Woodgears results and IRC guard-load summaries; direct fetches of kregtool.com, learn.kregtool.com, woodgears.ca and a municipal code handout were blocked. Statements resting on those are marked above.

Unresolved:

• Exact K4 availability history around 2021; Kreg's own K4 page and the 2025 K4 manual not opened here.
• Woodgears specimen geometry, load setup, sample counts; glue retest and 50 pound opening figure not re-read.
• Full 320 and XL manual text (collar setup steps, XL setup positions) not re-read; only the safety controls via search summary.
• IRC section numbers and load figures for guards not verified against the code text; no building-code section naming pocket-hole screws was found.
• Current Kreg screw selector and the MDF FAQ discrepancy not re-read.
• Exact bit-diameter chart per jig class; Sommerfeld's awareness of West Products; Armor Tool outcome; assignment chain and terminating papers for Park's reissue; commercial scale; museum record.
• Milescraft and Massca patents not located.