Fasteners
Connections that come apart with a tool. A joint is permanent, a latch releases with a thumb, a fastener wants a screwdriver — and that difference is the whole shelf. It is about service: something taken apart on a bench, six months later, by someone who has to get a driver onto it.
Every other catalogue asks whether it holds. This one also asks whether a hand and a tool can get to it, and get it out again. So the tool is drawn as a part of each model — the swept cone of a driver, the barrel of a bit holder — and it moves, which means the same check that catches two parts sharing space also catches a boss standing in the way of the screwdriver.
116 rows; 77 built so far, all of them in F4, the section about reach.
F1 — Threads in plastic
Threads in plastic — a thread you print, tap or form, where the screw makes its own home.
- F1-01Truncated metric pair; ISO 68-1 analogue
Joins print/print · Takes T+Z · Fails by crest shear
- F1-02Trapezoidal pair; ISO 2901 analogue
Joins print/print · Takes T±Z · Fails by flank wear
- F1-03ACME pair; ASME B1.5 analogue
Joins print/print · Takes T±Z · Fails by root shear
- F1-04Rounded thread; DIN 405 analogue
Joins print/print · Takes T±Z · Fails by flank crushing
- F1-05Buttress retention; DIN 513 analogue
Joins plug/print · Takes T+Z primarily · Fails by loaded-flank peel
- F1-06Two-start service plug; ISO 2901 analogue
Joins plug/housing · Takes T+Z · Fails by backdrive
- F1-07Interrupted tool plug; ISO 2901 adaptation
Joins plug/housing · Takes T+Z · Fails by sector shear
- F1-08Through tapped boss; ISO metric tap
Joins plate/print · Takes T+Z · Fails by strip
- F1-09Blind tapped boss; ISO metric tap
Joins plate/print · Takes T+Z · Fails by bottoming
- F1-10Plastic thread former; EJOT DELTA PT
Joins lid/print · Takes T+Z · Fails by hoop split
- F1-11Trilobular former; PLASTITE
Joins lid/print · Takes T+Z · Fails by displacement cracking
- F1-12Cutting screw; Type F example
Joins plate/print · Takes T+Z · Fails by chips/jamming
- F1-13High-low screw; Hi-Lo example
Joins cover/print · Takes T+Z · Fails by worn helix
- F1-14Replaceable threaded cartridge; ISO metric interface
Joins cartridge/housing · Takes T+Z,QZ · Fails by cartridge rotation
F2 — Inserts
Inserts — a metal thread put into plastic, because plastic threads wear out.
- F2-01Straight-knurl heat insert; SPIROL
Joins bolt/print · Takes T+Z,QZ · Fails by spin/pull-out
- F2-02Opposed-helical heat insert; SPIROL
Joins bolt/print · Takes T+Z,QZ · Fails by melt voids
- F2-03Diamond-knurl heat insert; [PEM SI](https://www.pemnet.com/eu/wp-content/uploads/sites/24/2022/06/sidata.pdf)
Joins bolt/print · Takes T+Z,QZ · Fails by spin
- F2-04Headed heat insert; SPIROL
Joins bolt/print · Takes T+Z · Fails by flange pull-through
- F2-05Tapered heat insert; SPIROL
Joins bolt/print · Takes T+Z,QZ · Fails by wedge split
- F2-06Ultrasonic insert; PEM SI
Joins bolt/polymer · Takes T+Z,QZ · Fails by interface damage
- F2-07Symmetric press insert; SPIROL 50
Joins bolt/print · Takes T+Z,QZ · Fails by hoop split
- F2-08Headed press insert; SPIROL 51
Joins bolt/print · Takes T+Z · Fails by boss fracture
- F2-09Expansion insert; Dodge Spred-Lok
Joins bolt/print · Takes T+Z,QZ · Fails by hoop split
- F2-10Cutting insert; Ensat
Joins bolt/print · Takes T+Z,QZ · Fails by back-out/chips
- F2-11Forming insert; SPIROL 10
Joins bolt/polymer · Takes T+Z,QZ · Fails by boss burst
- F2-12Open moulded-in insert; SPIROL
Joins bolt/moulding · Takes T+Z,QZ · Fails by knit-line fracture
- F2-13Blind moulded-in insert; SPIROL
Joins bolt/moulding · Takes T+Z,QZ · Fails by screw bottoming
- F2-14Bonded threaded bush; LOCTITE EA adhesive analogue
Joins bolt/print · Takes T+Z,QZ · Fails by debond
F3 — Captive nuts and trapped hardware
Captive nuts and trapped hardware — a nut the assembly holds so you only need one hand.
- F3-01Drop-in hex-nut trap; ISO 4032 style-1 hex (DIN 934). Shop default M5 AF 8 mm or M3 AF 5.5 mm
Joins Bolt through a printed part into a captured nut · Takes T along the bolt (+Z); Q resisted by the hex; shear only if the bolt is in a close hole · Fails by Pocket corners round; nut spins; roof-less pocket lets the nut fall out the moment the bolt backs off
- F3-02Side-entry hex trap; ISO 4032 nut, Prusa/Voron-style side slot
Joins Same, when the +Z face must stay closed · Takes T +Z into the roof; Q in the hex; peel on the slot lips · Fails by Roof peels / delaminates under T; slot lips yield; nut walks out the slot if the keeper is omitted
- F3-03Square-nut trap; DIN 557 (full) or DIN 562 (thin, M3–M10). Better anti-rotation than hex in FDM
Joins Bolt to print, where a hex would round the pocket · Takes T +Z; Q into four corners (higher bearing than hex) · Fails by Corner crack / hoop split of the square; thin DIN 562 nut crushes the floor
- F3-04T-slot hammer nut; Misumi HNTT / 20-series drop-in (OpenBuilds, 80/20 3276). Joinery already has A5-13 — this row is the nut
Joins Bolt to a printed (or aluminium) T-slot rail · Takes T +Z into the slot lips; Q on the nut's ears once it is turned 90° · Fails by Incomplete rotation (nut never cams square); printed lip peel; aluminium slot is fine, PETG lips are the question
- F3-05Cross-dowel / barrel nut; Häfele connecting bolt + barrel nut (the IKEA / bed-bolt one). Not the Minifix cam — that is A2-21 knockdown
Joins Rail to post, or print to print, with the nut's axis across the bolt · Takes T along the bolt; Q on the barrel's screwdriver slot as you clock it; shear in the wood/print around the cross-bore · Fails by Cross-bore misaligned with the bolt (thread never catches); barrel spins; wood/print splits on the cross-bore
- F3-06Clip-on speed nut / U-nut; Tinnerman U-type (Palnut, Auveco). Sheet-metal cage that clips over a panel edge
Joins Screw through a printed (or sheet) panel into a U-clip on the far edge · Takes T +Z; the U-spring is the nut; Q on the clip's ears · Fails by Clip walks off the edge; spring takes a set and the thread strips; wrong sheet gauge
- F3-07Weld-nut analogue; PEM WN / projection weld nut (real); printed stand-in is a closed hex trap
Joins Nut permanently on the far side of a panel, no far-side access later · Takes T +Z; Q on the weld (or on the printed roof) · Fails by Real: blown weld, spin-out. Print: roof peel, same as F3-02. Do not call a pause-nut a weld-nut on a public page
- F3-08Captive washer pocket; ISO 7089 plain washer (or ISO 7093 fender) sitting in a printed recess under the head
Joins Spreads bolt load onto print; stops the washer walking off during service · Takes T bearing on the floor; the washer is not the joint · Fails by Floor punch-through; washer dishes; MID-captured washer is lost if you ever need a different OD
- F3-09Trapped bolt head; ISO 4762 SHCS (socket) or ISO 4017 hex head in a printed pocket. Inverse of F3-01
Joins Print to plate, when the nut is the serviceable side (or a heat-set insert in the other part) · Takes T +Z on the head's underside; Q on the hex/socket so the bolt does not spin while you turn the nut · Fails by Head pulls through a thin floor; hex well rounds; MID-trapped bolt is unreplaceable (same cost as F3-13)
- F3-10Keyhole slot + shoulder screw; ASME B18.3 socket shoulder screw (stripper bolt) into a printed keyhole. Furniture hanger / speaker-keyhole is the same geometry
Joins Print hangs on a shoulder, lifts off on purpose — service hang, not a latch (thumb would send it to latches) · Takes Shear in the slot; T on the shoulder only while seated. The slot does not take pry · Fails by Slot lips yield; keyhole mouth too tight (won't hang) or too loose (drops); shoulder length shorter than wall_t
- F3-11Self-clinching nut in sheet; PEM S (or CL clinch, SO standoff). The real far-side thread in thin steel/aluminium
Joins Bolt through print (or a second sheet) into a clinched nut in sheet · Takes T +Z; Q on the clinch (hex/broach in the sheet). Sheet in shear around the hole · Fails by Poor clinch (nut spins in the sheet); over-press dishes the sheet; wrong hardness/hole for the SKU
- F3-12Wing-nut pocket; DIN 315 wing nut (or ASME B18.17). Hand-service cousin of F3-01
Joins Bolt to print where a driver will not be available later · Takes T +Z; Q by fingers on the wings, not by a driver · Fails by Wings hit the walls; pocket too tight to start; PETG floor creeps and the wing nut backs off (preload, F7)
- F3-13Print-pause-and-drop-in nut; ISO 4032 nut captured at a printer layer pause (the Voron / Prusa trick)
Joins Bolt to print with a closed roof and no side slot · Takes T +Z into the printed-over roof; Q on the hex · Fails by Roof delamination at the pause layer; nut shifted off-axis; pause knit fails in T
- F3-14Square-hole cage nut; 19" rack cage nut (Hammond / Chatsworth, M6 or 12-24). Clip-in cousin of F3-06 for a punched square
Joins Bolt through a panel into a spring cage in a square hole (rack rail, sheet, printed analogue) · Takes T +Z; the cage springs against the square; Q on the captive nut · Fails by Cage escapes the square; nut rattles (float is a feature until it is too much); printed square yields
- F3-15End-fed T-slot sliding nut; Misumi HNTT end-slide / 80/20 3278 (not the hammer). Different service from F3-04
Joins Bolt to a slot that is only open at the end · Takes T +Z into the lips; Q once the bolt is snug · Fails by End cap glued (cannot service); nut dumped out when the cap comes off; lips peel
- F3-16Flange-nut pocket; ISO 4161
Joins bolt/print · Takes T+Z · Fails by seat creep
- F3-17Captured locknut; ISO 10511
Joins bolt/print · Takes T+Z,QZ · Fails by trap spins
- F3-18Square-neck seat; DIN 603
Joins print/wood · Takes T+Z,QZ · Fails by neck crush
- F3-19Retained panel screw; Southco captive screw
Joins cover/frame · Takes T+Z · Fails by retainer breaks
- F3-20Replaceable nut drawer; ISO 4032
Joins bolt/print · Takes T+Z,QZ · Fails by drawer ejection
F4 — Bosses, pilots, seats — and DRIVER ACCESS
Bosses, pilots, seats — and driver access. The section this shelf exists for: a fastener nobody can reach is a weld that took longer.
- F4-01Swept driver cone; Phillips #2 / ISO 8764, modelled on a real chuck and bit holder
Joins Tool to screw head — this is the access geometry · Takes none as a joint; it licenses every other row's Q · Fails by Collision with a boss, bin wall, brick, laptop; false PASS if the cone shares the base plane (the 0.0 mm sliver case)
- F4-02Straight-run bit + holder + ratchet; ¼″ hex bit in a bit holder, optional ¼″ ratchet
Joins Same, when the well is deep and a stubby still will not seat · Takes Q at the head, only if the holder is on-axis · Fails by Holder collides with the well mouth; bit unseats; cam-out on a flexing long bit
- F4-03Stubby-driver well; Wera Kraftform Stubby / Wiha Stubby
Joins Tool to head in a shallow overhead · Takes Q, with less leverage than a full handle · Fails by Handle OD hits the well; not enough leverage so you cam out and chew the head (no torque wrench to tell you)
- F4-04Right-angle / offset-bit access; ¼″ bit ratchet (Wera 8001 A, Vessel) or a hex T-handle on its side
Joins Tool to head when +Z is blocked and +X is open · Takes Q at 90° to the screw; feel and cam-out both get worse · Fails by Bit unseats under side load; ratchet cannot reset; side cover was glued
- F4-05Ball-end hex off-axis; Bondhus Balldriver / Wera Hex-Plus Ball, ISO 2936 / ASME B18.3 hex
Joins Tool to a socket-head cap screw (ISO 4762) that cannot be reached on-axis · Takes Q at the socket, derated off-axis · Fails by Ball slips and rounds ISO 4762 hex; used as an excuse to skip the cone; advertised 25° taken as a working angle under load
- F4-06
access_okservice-stage parameter — the check a real build had to invent, and a second one skippedJoins A predicate on (screw, tool, stage), not a part · Takes none; it is the gate · Fails by False PASS (coplanar cone, coincident faces, slider that opens a well into air — a real bin-floor case). Glued prerequisite. Unmeasured tool marked PASS
- F4-07Annular screw boss; EJOT DELTA PT / SPIROL boss rule of thumb (OD ≈ 2–3× insert/screw OD — speculative for FDM, not a shop number)
Joins Screw or insert to a printed wall/floor · Takes T +Z; Q; hoop (radial) from the thread or insert. Hoop is what splits it · Fails by Hoop split along a weak axis; FDM: split follows roads or layer lines. Ring analogy
σθ ≈ p·r/texplains the shape, not the number. Ribs do not replace wall - F4-08Ribbed / gusseted boss; a standing upright's root fillet — the worked example, and the defect
Joins Boss to a wall or floor, carrying bending as well as hoop · Takes T +Z in the bore; bending in the gusset; hoop still in the annulus · Fails by Root peel; gusset in the driver cone; buried fillet that the page claims and the part lacks. Moulding: rib ≈ 0.5–0.6× wall to limit sink (speculative, not FDM gospel)
- F4-09Countersink seat; ASME B18.6.1 82° (#8 wood screw) vs ISO 10642 90° (metric CSK). Do not infer angle from diameter
Joins Flush #8 (or CSK machine screw) through print into wood or an insert · Takes T +Z; the cone wedges a thin printed rim apart · Fails by Rim split from the wedge; 90° sink under an 82° head (or vice versa) that only bears on a knife edge; proud sink that is not a manifold
- F4-10Counterbore seat; ISO 4762 SHCS well, and a 9.0 mm × 5 mm well for a #8
Joins Print to wood (a dock, or a stand) or print to bolt · Takes T +Z on a flat floor — no wedge. This is the safer printed seat · Fails by Floor punch-through; well ID too tight for the head; well so deep the holder collides (F4-02)
- F4-11Pilot / clearance pair; ISO 273 medium clearance in the clamped part, pilot only in the receiver
Joins Clamped plate to boss, wood, or insert · Takes T only if the receiver has thread/nut; the clearance hole takes no T. Shear if the hole is close · Fails by False clamp (screw shoulders in the lid); oversize clearance that lets the joint walk; undersize that taps the lid
- F4-12Boss printed standing vs lying — orientation is a fastener parameter
Joins Same boss, two build axes, two failure modes · Takes T/Q as F4-07; the split plane rotates with build-Z · Fails by Standing: clean bore, splits along a road. Lying: sagged roof that nips the screw/insert; layer peel under T
- F4-13Bridged insert hole; gripper Ø4 × 6 mm for M3 brass heat-set, printed horizontal. SPIROL / ruthex / CNC Kitchen M3 SKU TBD
Joins Insert to printed finger/boss; screw to insert · Takes T +Z of the screw into the insert; the insert's pull-out is axial in the bore. Gripper: 2× M3 on 16 mm pitch, M3-in-PETG refused at 200 N grip (rule, unprinted) · Fails by Insert spun (bore too big / not melted); boss warped by hot air; sagged bridge nips the insert; M3 in PETG strips (the thing this row exists to avoid)
- F4-14Bin-floor screw seat; a #8 in a bin floor (the access fix that deleted the 14 mm channel)
Joins Printed cradle to bench · Takes T +Z into the bench; the print only clears and seats · Fails by Inaccessible head because the bin is full and nobody modelled the prerequisite; a chamfer tangent to a neighbouring bore
- F4-15Through-feature driver channel; a 14 mm gap through a 25 mm boss and the cable rail
Joins Negative space so F4-01 can exist when a feature was built on the axis · Takes none; it is the patch · Fails by Channel too small (driver still hits); channel so big the boss stops being a boss; leftover channel that is now just a dirt trap
- F4-16Hand envelope + service sequence; "say where the driver's hand goes"
Joins The hand is part of the tool · Takes none; it is the rest of F4-06 · Fails by Hand hits a cup, a brick, a laptop; prerequisite glued; sequence not on the page so six months later nobody knows
- F4-17Nailer-nose window; framing-stud jig 50 mm cut-out, A2-25
Joins Tool (nailer) to as-ripped 2x, through a printed saddle · Takes Insertion −Z of a 16d; the jig takes racking during the shot, not after · Fails by Nose blocked; closed corner puts nails where the plate splits; palm nailer wants a wider window (the page slider)
- F4-18Washer / bearing floor; ISO 7089 under a hex head, or a bare floor without a washer
Joins Head or washer to print, so T does not punch through · Takes T bearing; this is the land F4-09/10 sit on · Fails by Punch-through; washer dishes; floor is a bridge that sags into the hole; a "floor" that is actually the screw hole next door
- F4-19Blind pilot/chip well; Type F screw
Joins cover/boss · Takes T+Z · Fails by bottoming
- F4-20Horizontal roof relief; ISO 4762 seat
Joins plate/print · Takes T+Z · Fails by sag blocks tool
- F4-21Ratchet pocket; ¼-inch drive socket
Joins tool/nut · Takes QZ · Fails by no reset arc
- F4-22Wrench-flat recess; ISO 4032
Joins tool/nut · Takes QZ · Fails by no swing
- F4-23Screw retrieval port; Southco captive analogue
Joins screw/cover · Takes T+Z · Fails by trapped loose screw
F5 — Fastening into wood and sheet
Fastening into wood and sheet — where the material, not the fastener, decides what holds.
- F5-01#8 wood screw into pine side grain; the screw this shelf is written around
Joins Printed part (clearance + CSK/CBORE) to a pine bench or 1x/2x face · Takes T along the screw (withdrawal); S in the bench face; Q only while driving · Fails by Withdrawal; split if no pilot near the end; PETG seat creeps (the print loosens, the pine may not)
- F5-02#8 into pine end grain (stud end, 2x cut face)
Joins Print or plate to the end of a 2x · Takes T poor; S slightly better. NDS-style rules treat end-grain withdrawal as a fraction of side grain — speculative, not a shop number; treat as "do not hang a life on it" · Fails by Withdrawal; split along the growth rings
- F5-03#8 into ¾″ ACX FACE (23/32 actual). Loft-bed decks: screwed every 8″
Joins Print or a second ply to the face of ACX · Takes T into the face (plies in the way of withdrawal); S in the plane. This is the ply joint that works · Fails by Veneer pull-through (use a washer / F4-18); screw too long for 23/32 and kisses whatever is behind
- F5-04#8 into ¾″ ACX EDGE — ⚠ the failure everyone hits. Joinery A5-32 exists because of this: face-fasten, do not edge-screw
Joins Print or a rail into the edge of 23/32 ACX (carcase, stair panel, crate) · Takes T poor; the screw is in glue lines and inner-ply voids. Loft-bed README says *"screws hold in the edges"* — that is a design assertion, not a coupon. Speculative: a fraction of F5-03, and a split/blow-out on the first over-torque. No torque wrench · Fails by Ply splits / blows out; screw wanders into a void; edge swells and the print cracks
- F5-05Pronged T-nut; McMaster 90946A / 4-prong furniture T-nut (M6 or ¼-20)
Joins Bolt through print or wood into a T-nut whose flange is on the far face · Takes T along the bolt, flange in bearing on the far face (the only way this works). Q on the prongs · Fails by Prongs spin (flange on the wrong face, or MDF); flange pulls through ply edge; over-press
- F5-06Screw-in threaded insert for wood; E-Z LOK knife-thread (brass, 308-series) or steel wood insert
Joins Bolt to pine or ply face, serviceable metal thread in wood · Takes T + Q on the insert's exterior thread into wood; the bolt sees metal · Fails by Wood splits on the knife thread; insert walks out; driven into ACX edge (F5-04 again)
- F5-07Pocket screw; Kreg (R3/K5, 15° in ¾″ stock, 1-¼″ fine-thread for ¾″ ply). Joinery A2-20 is the joint
Joins Wood to wood, butt, the screw in a 15° pocket · Takes T along the inclined axis (mostly clamping the butt); S in the joint. Honest name: fastener + butt · Fails by Head breakout of the pocket; boards walk (no clamp); pocket in ACX edge (F5-04)
- F5-08Confirmat; Häfele Confirmat (7 mm, e.g. 264.30) — the particleboard carcass screw
Joins Panel to panel, through-face into edge, in one shot · Takes T along the screw; the wide thread is supposed to grab chipboard/MDF. In ACX edge it is still F5-04 with a fancier thread — speculative, Häfele rates the substrates they name, not this shop's ACX · Fails by Edge blow-out; wrong bit so the head does not seat; used in 23/32 ACX edge as if it were 19 mm particleboard
- F5-09Cross-dowel / bed bolt in wood; Häfele connecting bolt + barrel nut, IKEA bed-rail bolt. Same fastener as F3-05, wood host. Joinery A2-21
Joins Rail to post in pine or ply · Takes T along the bolt, drawing the rail shoulder; Q while clocking the barrel · Fails by Cross-holes miss; barrel in ACX edge splits; bolt too short to catch
- F5-10Nailer into as-ripped 2x; 16d end-nail through a plate into a stud, jig-held (A2-25, framing-stud jig)
Joins 2x plate to 2x stud, wall built on the floor · Takes S in the plate face; T (withdrawal) of the nail is the weak direction. The jig takes racking during the shot · Fails by Split plate; nailer cannot reach (the window is the fastener); jig too tight on a fat stud, too sloppy on a thin one
- F5-11Printed-part-to-lumber saddle; a stud-jig T-saddle and a 15° saddle as the same module (grab a thing that already exists, then fasten)
Joins Printed saddle to as-ripped 2x or to a laptop lip / bench — then a #8 or a nail through the print · Takes The saddle locates (S, racking); the fastener takes T. A saddle with no fastener is a latch/gravity seat · Fails by Saddle sized to 38.1 on a 36.8 pile (sloppy) or 39.6 (will not drop on); fastener that fights the saddle (nailer nose vs wall); gravity saddle treated as a bolted joint
- F5-12Lag screw into 2x6 ledger; ⅜″ × 5″ lags, two per stud (loft-bed ledgers, ASME B18.2.1 lag). Washer under the head
Joins Ledger to a stud, or a printed bracket to a 2x · Takes T + S into side grain of the stud. Withdrawal speculative (NDS lag formula is not a shop number). This is the heavy cousin of F5-01 · Fails by Split; withdrawal; no washer so the head buries; pilot = major so it never bites
- F5-13Through-bolt + fender washer; ISO 4017 bolt, ISO 7093 large washer, nut on the far side
Joins Print or ply to pine/ply, both faces accessible · Takes T = bolt (the honest joint); S if close-fit. Wood/print only in bearing. This is the repair when F5-04 has already happened · Fails by Crushing (washer too small); nut spins (no trap, no second wrench); PETG under the washer creeps (F7)
- F5-14Construction / washer-head screw; SPAX or GRK RSS into pine or ACX face
Joins Print or wood to wood, structural-ish, no lag · Takes T + S, washer head does F4-18 without a loose washer. Still not a published kN here · Fails by Seat crush if you CSK a washer-head; ACX edge (don't); cam-out if you assume Phillips
- F5-15U-nut / clip-on on sheet; Tinnerman U-type into a painted or raw sheet edge (same fastener as F3-06, sheet host)
Joins Printed bracket to sheet metal, or two sheets, blind far side after clip-on · Takes T +Z into the clip; sheet in bearing · Fails by Clip walks; wrong gauge; screw strips the clip
- F5-16Printed ply-face saddle / edge channel; joinery A5-32 — the module you print instead of driving F5-04
Joins Printed channel grabs 23/32 ACX on the faces, #8s go into the face, never the edge · Takes S + racking in the channel; T in the face screws (F5-03). The edge of the ply is a register, not a thread · Fails by Channel sized to ¾″ on 23/32 stock (sloppy or split); screws secretly aimed at the edge; no lead-in so it will not drop on a swollen panel
- F5-17Face-loaded cleat seat; SPAX screw analogue
Joins print/wood · Takes T+Z,SXY · Fails by cleat split
- F5-18Blind threaded anchor; RIVNUT
Joins bolt/sheet · Takes T+Z,QZ · Fails by anchor spin
- F5-19Thread-forming sheet screw; ISO 1478
Joins print/sheet · Takes T+Z · Fails by thread strip
F6 — Permanent and semi-permanent
Permanent and semi-permanent — rivets, welds, glue: the ones that do not expect you back.
- F6-01Blind rivet; POP
Joins sheet/print · Takes T+Z,SXY · Fails by pull-through
- F6-02Solid rivet; DIN 660
Joins sheet/sheet · Takes T+Z,SXY · Fails by shear
- F6-03Tubular rivet; eyelet
Joins sheet/print · Takes T+Z,SXY · Fails by flare tears
- F6-04Screw post; Chicago binding screw
Joins sheets/print · Takes T+Z,SXY · Fails by barrel spins
- F6-05Drive rivet; Essentra example
Joins panel/print · Takes T+Z,SXY · Fails by legs fracture
- F6-06Screw rivet; Essentra example
Joins panel/print · Takes T+Z · Fails by polymer screw wear
- F6-07Fir-tree trim pin; automotive clip
Joins panel/print · Takes T+Z · Fails by barb tear
- F6-08Heat-staked post; Branson staking
Joins sheet/print · Takes T+Z · Fails by head creep
- F6-09Ultrasonic stake; Branson
Joins sheet/polymer · Takes T+Z · Fails by weak upset
- F6-10Solvent seam; SCIGRIP analogue
Joins compatible prints · Takes SXY; peel weak · Fails by crazing/debond
- F6-11Epoxy lap; LOCTITE EA analogue
Joins print/wood · Takes SXY; peel weak · Fails by interface peel
- F6-12Wood-glue land; Titebond II
Joins wood/wood · Takes SXY grain-parallel · Fails by wood/glue failure
- F6-13Nailed seat; framing nail
Joins wood/wood · Takes SXY,T+Z limited · Fails by withdrawal/split
- F6-14Cut-release tie slot; cable tie
Joins bundle/print · Takes loop tension · Fails by creep/UV
F7 — Preload retention and anti-loosening
Preload retention and anti-loosening — keeping the tension you put in.
- F7-01Plain bolted pad; ISO 4017 control
Joins print/plate · Takes T+Z · Fails by relaxation
- F7-02Compression limiter; FASTEKS
Joins print/plate · Takes T+Z,SXY via location · Fails by wrong sleeve length
- F7-03Long-grip standoff; ISO 4017
Joins print/plate · Takes T+Z · Fails by bending
- F7-04Load-spreading washer; ISO 7093
Joins print/plate · Takes T+Z · Fails by washer dishes
- F7-05Nyloc capture; ISO 10511
Joins print/plate · Takes T+Z,QZ · Fails by lost prevailing torque
- F7-06Anaerobic lock; LOCTITE 243
Joins metal threads · Takes QZ · Fails by contamination/chemistry
- F7-07Serrated flange; DIN 6923 analogue
Joins metal seat/bolt · Takes QZ · Fails by polymer embedding
- F7-08Split washer; DIN 127 analogue
Joins bolt/seat · Takes axial spring initially · Fails by flattens
- F7-09Disc-spring stack; DIN EN 16983
Joins bolt/seat · Takes axial spring · Fails by flat/bottomed
- F7-10Wedge-lock pair; Nord-Lock
Joins bolt/metal seat · Takes QZ · Fails by seat slips
- F7-11Jam-nut pair; ISO 4035 analogue
Joins threaded rod/plate · Takes QZ · Fails by wrong jamming
- F7-12Positive tab washer; DIN 93 analogue
Joins nut/keyed seat · Takes QZ · Fails by tab fatigue