# Catches, Stays, and Shelf Pins Hewn Shop Notes · https://hewn.build/shop-notes/catches-stays-and-shelf-pins AI-drafted, not yet checked: Drafted by Chip, the writing system Hewn runs on Claude, from Hewn's craft corpus. Jonathan Salomons has not read this note yet, and no outside reader has checked it. Read it as a shop note: check a number before you cut to it. Cite as: "Catches, Stays, and Shelf Pins." Hewn Shop Notes, hewn.build/shop-notes/catches-stays-and-shelf-pins. Drafted 2026-05-04; AI-drafted, not yet checked. --- Hinges and drawer slides carry the load. Everything else in the hardware category — catches, stays, shelf pins — is the part where people assume they can figure it out at the bench. They can't, or they wouldn't be reading notes like this after a lid slams shut on their kid's hand. These are functional requirements, not finishing details. Spec them before you mill the first piece. --- ## Door Catches Any door that doesn't stay closed under its own weight needs a catch. Any door without a handle also needs a catch — the handle gives you tactile confirmation the door is closed; without one, the catch does that job. Those are two separate problems that often share the same solution. **Rare-earth magnetic catches** are the default for most residential work. Magnet to the case, steel strike to the door interior. They tolerate misalignment, which matters in face-frame overlay work where tolerances are loose. They tolerate seasonal movement in inset doors, where the reveal changes a few thousandths through the year. One specification note: mount for full face contact between magnet and plate. Pull-off force drops sharply past 2mm gap. Here's the one failure mode worth knowing about inset doors specifically. In a heated BC Interior shop in winter, the door is at its loosest. Gap looks right. But in June, that same door is tighter — and without a magnetic catch providing closing force, a handleless inset door will gap open in January when the shop cools down at night. The catch is what keeps it closed. Without it, you'll get a callback. **Ball catches** give a tactile click at closure. Right for tool storage, utility drawers with doors, anywhere you want to feel the door close. Tension adjusts by tapping the bore in or out. **Touch latches** — the push-to-open mechanical type — are required for handleless Euro-style cabinetry. The release geometry is precise, and they don't tolerate seasonal movement well. Use them only with frameless work where the reveals are controlled. A tight inset door in dry season can bind before the release engages. **Bullet catches** are period furniture hardware. Spring-loaded bullet into a small bore, used for secretary doors, jewelry boxes, display cases. They disappear into the design. That's their only advantage; don't use them where anything else works. Selection logic: face-frame overlay with a handle — magnetic. Frameless inset handleless — magnetic. Handleless push-to-open Euro-style — touch latch. Tool storage, positive closure wanted — ball catch. Period furniture — bullet catch. --- ## Lid Stays and Flap Support Any lid over about 8 pounds that opens unsupported is a hazard at residential delivery. A heavy blanket chest lid slamming shut on a child's fingers is a piece that works fine in the shop and injures someone at the client's house six months later. Lid stay hardware is not an upgrade. The secondary argument is mechanical: an unsupported heavy lid stresses its hinges on every opening cycle. Stays extend hinge life. Spec them, build them into the price. **Lid stay arms** (friction-lock hinged arms) are right for blanket chests, storage ottomans, piano benches — anything that opens to roughly 90° and holds. Arms mount to the case sides, lock in the open position under friction. Straightforward. **Soft-close gas springs** are the residential standard for toy boxes, storage benches, laundry cabinets — anything where a heavy lid needs controlled opening and close. The critical thing: a gas spring is not a generic purchase. Specify by lid weight, lid dimensions, and desired open angle. An underrated spring slams the lid shut. An overrated one holds it open and needs force to close. Sugatsune and Salice both publish selection software; use it for anything over 15 pounds. **Fall-front support** is its own problem. A secretary writing surface or fall-front cocktail table needs to support the use load, not just the lid weight. A quadrant stay rated for lid weight is appearance hardware. For a fall-front that will be used as a writing surface, use drawer-slide-style pull-out supports rated for actual use load. The difference is whether someone leans on it. A good residential threshold: anything over 12 pounds in a piece going to a client gets soft-close or damped support. In toy boxes — regardless of lid weight — it gets a soft-close gas spring. Those are lids that trap small children. --- ## Shelf Pins Adjustable shelves require boring rows of holes in the case sides. Two pin systems exist, and the choice determines what jig you need and what pins are available. **The 5mm European system on a 32mm grid** is the current standard for residential cabinetry. Pin diameter 5mm, holes 32mm on center vertically, setback from front and back edge typically 37mm. This is the system that matches European concealed hinge boring equipment. Steel spoon pins are universal here; plastic sleeve collars reduce lateral play if you need precise positioning. **The 1/4-inch North American system** is the traditional furniture standard. Quarter-inch pin diameter, holes on 1-inch or 1-1/4-inch centers, setback 1 to 1-1/2 inches from each edge. Compatible with all North American tooling. Selection logic: frameless cabinetry — 5mm/32mm, full stop. Face-frame cabinetry — either works, 1/4-inch is the tradition. Solid wood furniture — 1/4-inch. **Use steel pins for any shelf carrying real weight.** Four steel spoon pins in the 5mm system carry 100–200 pounds per shelf. Plastic pins are not rated for that. Don't specify them where shelves will hold books, kitchen goods, anything with mass. Plastic is for light display shelving only. One boring detail that bites people: the holes on both case sides must be at the same height for the shelf to level. Misaligned holes produce a rocking shelf — invisible at installation, visible the first time there's an uneven load. Use a dedicated jig. The Rockler 5mm jig and Kreg shelf pin jig both work. Freehand boring is for utility shop work. Bore depth: pin length plus 2mm minimum. A shallow bore leaves the pin proud of the surface and the shelf rocks. Deeper is fine. --- ## Installation Timing This is where most hardware errors happen. Every hardware element has a timing: installed before finishing or after finishing. The rule is simple, but the cup hinge is the exception that confuses everyone. **Bore and mortise before finishing. Mount on the surface after finishing.** Hinge mortises cut after finishing leave finish residue in the mortise walls. The hinge leaf won't seat flush. Cup hinge bores through a finished door surface produce tearout at the top of the bore on the finished face. Shelf pin holes: same tearout problem. Bore everything before finishing, seal the raw bores with a thin coat, then finish. After the wood is finished, mount slides, hinge base plates, catches, stays, pulls, and knobs. The cup hinge specifically trips people because it has a split sequence: bore the cup hole in the door before finishing; mount the base plate to the case after finishing; clip the door to the base plate last. Most builders mount the base plate before finishing — which buries it under the finish and creates a shadow line at the plate edge — because they think of hinges as a single step. They're two steps separated by finishing. One more timing issue for inset doors. Install inset doors at the seasonal humidity median for the installation environment, not at the dry extreme. Fitting inset reveals in a heated Penticton shop in February means the reveals are at their winter maximum. Those same reveals will be tighter in June. Fit at the dry extreme, and the door binds in summer. Acclimate the piece to where it's going before you do final fitting. --- Before you mill the first piece: every door without a handle needs a catch specified. Any lid needs a stay specified; estimate the weight and confirm the type. Every shelf run needs the pin standard chosen, steel pins confirmed for loaded shelves, and boring method designated. Every hardware element needs its installation timing assigned: bore before finishing, surface-mount after. Split the cup hinge sequence. These aren't details you figure out at the bench. They're the plan.