{"$schema":"nativecad-dfm-pack/1","id":"furniture","title":"Furniture — desks, chairs, tables, shelving, cabinets","sector":"furniture","version":"2026-09-03","summary":"Ergonomic and regulatory dimensions, joinery, materials and the BIFMA/EN/ADA tests a piece of furniture is held to, plus real build recipes for desks, task chairs and shelving.","aliases":["desk","chair","table","shelf","shelving","cabinet","office furniture","seating","casegoods"],"crossSector":false,"size":"core","sources":[{"id":"bifma-x5.1","title":"ANSI/BIFMA X5.1-2017 General-Purpose Office Chairs — Tests","url":"https://www.bifma.org/store/viewproduct.aspx?id=8391764","accessed":"2026-09-03"},{"id":"bifma-x5.5","title":"ANSI/BIFMA X5.5-2014 (R2019) Desk Products — Tests","url":"https://www.bifma.org/store/viewproduct.aspx?id=8391767","accessed":"2026-09-03"},{"id":"bifma-g1","title":"BIFMA G1-2013 Ergonomics Guideline for Furniture Used in Office Work Spaces","url":"https://www.bifma.org/","accessed":"2026-09-03"},{"id":"en-1335","title":"EN 1335-1:2020 Office furniture — Office work chair — Dimensions","url":"https://www.en-standard.eu/","accessed":"2026-09-03"},{"id":"en-527","title":"EN 527-1:2011 Office furniture — Work tables and desks — Dimensions","url":"https://www.en-standard.eu/","accessed":"2026-09-03"},{"id":"ada-2010","title":"2010 ADA Standards for Accessible Design, §306 knee/toe clearance & §902 dining/work surfaces","url":"https://www.ada.gov/law-and-regs/design-standards/2010-stds/","accessed":"2026-09-03"},{"id":"bifma-x5.9","title":"ANSI/BIFMA X5.9-2014 Storage Units — Tests","url":"https://www.bifma.org/","accessed":"2026-09-03"},{"id":"32mm-system","title":"The 32 mm cabinet construction system — shelf-pin hole spacing and line-boring convention","note":"industry convention, widely documented by cabinet-hardware makers (Blum, Hettich); no single normative document","accessed":"2026-09-03"},{"id":"wood-handbook","title":"USDA Forest Products Laboratory, Wood Handbook: Wood as an Engineering Material (FPL-GTR-282)","url":"https://www.fpl.fs.usda.gov/documnts/fplgtr/fpl_gtr282.pdf","accessed":"2026-09-03"},{"id":"lee-valley-confirmat","title":"Lee Valley / Häfele technical data — Confirmat (KD) screw hole drilling specification","url":"https://www.leevalley.com/en-us/shop/hardware/knock-down-fittings","accessed":"2026-09-03"}],"entries":[{"id":"seat-height","kind":"dimension","tier":1,"title":"Task chair seat height (adjustable range)","summary":"Adjustable seat height should span at least 380–510 mm above the floor (5th–95th percentile popliteal height); a fixed-height chair sits at 430–460 mm.","applies":["task chair","office chair","fixed-height chair"],"value":{"min":380,"max":510,"typical":450,"unit":"mm"},"basis":"Popliteal height 5th–95th percentile adult, seated, shod","sources":["bifma-g1","en-1335"],"tags":["ergonomics","seating","chair"]},{"id":"seat-depth","kind":"dimension","tier":1,"title":"Task chair seat depth","summary":"Usable seat pan depth (front edge to backrest) should be 380–440 mm, ideally adjustable, so the front edge clears the back of the knee by 40–70 mm.","applies":["task chair","office chair"],"value":{"min":380,"max":440,"typical":410,"unit":"mm"},"basis":"Buttock-popliteal length 5th percentile minus knee clearance margin","sources":["bifma-g1","en-1335"],"tags":["ergonomics","seating","chair"]},{"id":"seat-width","kind":"dimension","tier":1,"title":"Task chair seat width","summary":"Seat pan width at the front should be at least 400 mm (typical 460–510 mm) to clear the 95th-percentile hip breadth with clothing allowance.","applies":["task chair","office chair"],"value":{"min":400,"max":510,"typical":460,"unit":"mm"},"basis":"95th percentile seated hip breadth + clothing allowance","sources":["bifma-g1"],"tags":["ergonomics","seating","chair"]},{"id":"backrest-height-width","kind":"dimension","tier":1,"title":"Task chair backrest height and width","summary":"A mid-back backrest spans 450–500 mm above the seat and is 300–360 mm wide; lumbar support centre sits 150–250 mm above the seat, adjustable.","applies":["task chair","office chair"],"value":{"min":450,"max":500,"typical":480,"unit":"mm"},"basis":"Lumbar-to-scapula coverage for 5th–95th percentile torso length","sources":["en-1335","bifma-g1"],"tags":["ergonomics","seating","backrest"]},{"id":"armrest-height","kind":"dimension","tier":1,"title":"Armrest height above seat (adjustable)","summary":"Armrest top surface should adjust 200–280 mm above the compressed seat surface so forearms rest level with elbows at 90°, and clear the desk apron underside.","applies":["task chair","office chair"],"value":{"min":200,"max":280,"typical":230,"unit":"mm"},"basis":"Elbow rest height 5th–95th percentile seated, minus seat compression","sources":["bifma-g1","en-1335"],"tags":["ergonomics","seating","armrest"]},{"id":"desk-height-fixed","kind":"dimension","tier":1,"title":"Fixed desk / worksurface height","summary":"A non-adjustable desk or work table sits 720–760 mm above the floor, 730 mm typical, to clear a seated elbow with the chair at 450 mm seat height.","applies":["desk","table","workstation"],"value":{"min":720,"max":760,"typical":730,"unit":"mm"},"basis":"Seated elbow height above floor minus 20–30 mm worksurface clearance","sources":["en-527","bifma-x5.5"],"tags":["ergonomics","desk","worksurface"]},{"id":"desk-height-sit-stand","kind":"dimension","tier":1,"title":"Sit-stand desk height range","summary":"A sit-stand desk must adjust across 650–1250 mm to cover seated (5th percentile) through standing (95th percentile) elbow height.","applies":["sit-stand desk","height-adjustable desk"],"value":{"min":650,"max":1250,"unit":"mm"},"basis":"Seated 5th-percentile elbow height to standing 95th-percentile elbow height","sources":["bifma-x5.5","bifma-g1"],"tags":["ergonomics","desk","sit-stand"]},{"id":"desk-knee-clearance","kind":"dimension","tier":1,"title":"Desk knee and toe clearance (ADA 306)","summary":"Knee clearance under a worksurface needs ≥ 685 mm width, ≥ 635 mm depth at 230 mm height tapering to 480 mm depth at 685 mm height, with toe clearance to 230 mm.","applies":["desk","table","accessible workstation"],"value":{"min":685,"unit":"mm"},"basis":"ADA 2010 §306 knee and toe clearance for a forward wheelchair approach","sources":["ada-2010"],"tags":["accessibility","desk","clearance"]},{"id":"worksurface-thickness","kind":"dimension","tier":1,"title":"Desk / table worksurface thickness","summary":"A panel worksurface (particleboard or MDF core, laminate faced) runs 18–25 mm thick; 25 mm is standard for spans over 900 mm without a centre support.","applies":["desk","table","worksurface"],"value":{"min":18,"max":25,"typical":25,"unit":"mm"},"basis":"Deflection under 250 N point load stays under 6 mm at this thickness and span","sources":["bifma-x5.5"],"tags":["dimension","worksurface","panel"]},{"id":"leg-section-square","kind":"dimension","tier":1,"title":"Desk/table leg section, square steel tube","summary":"A steel-tube desk leg is typically 40×40 mm to 50×50 mm square, 1.5–2 mm wall, for a 720 mm leg under a 25 mm worksurface up to 1600×800 mm.","applies":["desk leg","table leg","steel-frame table"],"value":{"min":40,"max":50,"typical":40,"unit":"mm"},"basis":"Column buckling and racking stiffness for BIFMA X5.5 stability loads","sources":["bifma-x5.5"],"tags":["dimension","leg","steel"]},{"id":"shelf-span-sag","kind":"rule","tier":1,"title":"Shelf span vs. sag (particleboard/MDF)","summary":"An 18 mm particleboard shelf should not span more than 700–800 mm unsupported under normal book/storage load (≈0.6 mm sag per 100 mm span at mid-load); add a centre support beyond 900 mm.","applies":["shelf","shelving","cabinet shelf"],"value":{"max":800,"unit":"mm"},"basis":"Deflection limit L/300 under a uniform 40 kg/m distributed load, E ≈ 2500 MPa for particleboard","sources":["bifma-x5.9"],"tags":["rule","shelf","deflection"]},{"id":"shelf-thickness","kind":"dimension","tier":1,"title":"Cabinet/bookcase shelf thickness","summary":"Fixed or adjustable cabinet shelving runs 16–19 mm thick (18 mm nominal) for particleboard/MDF/plywood; glass shelves run 6–10 mm tempered.","applies":["shelf","cabinet","bookcase"],"value":{"min":16,"max":19,"typical":18,"unit":"mm"},"basis":"Standard panel stock thickness matching the 32 mm system's edge-band allowance","sources":["32mm-system"],"tags":["dimension","shelf","panel"]},{"id":"32mm-system-pitch","kind":"rule","tier":1,"title":"32 mm cabinet system: hole pitch and line-boring","summary":"Cabinet-side shelf-pin and hinge holes are line-bored on a 32 mm vertical pitch, ⌀5 mm × 12–13 mm deep, front row 37 mm from the front edge, back row 37 mm from the back edge.","applies":["cabinet","shelving","carcass"],"value":{"value":32,"unit":"mm"},"basis":"Industry-standard 32 mm system lets any panel width use the same boring template","sources":["32mm-system"],"tags":["fastener","shelf-pin","32mm-system","cabinet"],"check":{"process":"sheet","rule":"hole-edge-distance","params":{"minEdgeMm":8}}},{"id":"shelf-pin-hole","kind":"fastener","tier":1,"title":"Shelf-pin hole size","summary":"Shelf-pin holes are ⌀5 mm (metric pin system) or ⌀1/4 in (imperial), bored 12–13 mm deep in 18 mm stock, leaving ≥ 5 mm of material behind the hole.","applies":["shelf","cabinet","shelf pin"],"value":{"value":5,"unit":"mm"},"basis":"5 mm pin diameter is the de-facto metric standard across European cabinet hardware","sources":["32mm-system"],"tags":["fastener","shelf-pin"]},{"id":"cam-lock-fitting","kind":"fastener","tier":1,"title":"Cam-lock (cam-and-dowel) knock-down fitting","summary":"A cam-lock joint uses a ⌀15 mm × 12 mm deep cam housing bored face-on and a ⌀8 mm × 30–35 mm deep cam-bolt hole bored edge-on, tied together by an 8 mm locating dowel 25–30 mm from the panel edge.","applies":["cabinet","knock-down furniture","flat-pack"],"value":{"value":15,"unit":"mm"},"basis":"Standard RTA-furniture cam-lock hardware (e.g. Häfele/Blum minifix) hole set","sources":["lee-valley-confirmat"],"tags":["fastener","cam-lock","knock-down","flat-pack"]},{"id":"material-particleboard","kind":"material","tier":1,"title":"Particleboard (chipboard) core panel","summary":"Particleboard: density 650–750 kg/m³, MOE ≈ 2200–2800 MPa, stocked 16/18/25 mm, melamine- or laminate-faced; the default RTA-furniture and shelf core.","applies":["shelf","cabinet","worksurface","flat-pack"],"value":{"table":[{"property":"density","min":650,"max":750,"unit":"kg/m3"},{"property":"MOE","min":2200,"max":2800,"unit":"MPa"}]},"basis":"Typical EN 312 particleboard grade P2, melamine faced","sources":["wood-handbook"],"tags":["material","particleboard","panel"]},{"id":"chair-base-diameter","kind":"dimension","tier":1,"title":"5-star chair base diameter","summary":"A 5-star swivel chair base spans 640–700 mm diameter — at least as wide as the seat plus armrests — to prevent tip-over per BIFMA X5.1.","applies":["task chair","office chair base"],"value":{"min":640,"max":700,"typical":660,"unit":"mm"},"basis":"Stability envelope must exceed the seated occupant's centre-of-gravity offset at max recline","sources":["bifma-x5.1"],"tags":["dimension","chair-base","stability"]},{"id":"tabletop-corner-radius","kind":"rule","tier":1,"title":"Tabletop and desk corner radius","summary":"Exposed tabletop and desk corners need ≥ 6 mm radius (BIFMA) to pass the sharp-edge/corner safety check; 12–20 mm is typical for a soft 'waterfall' front edge.","applies":["desk","table","worksurface"],"value":{"min":6,"max":20,"typical":12,"unit":"mm"},"basis":"BIFMA X5.5 sharp-edges-and-corners requirement","sources":["bifma-x5.5"],"tags":["rule","safety","corner","edge"]},{"id":"test-bifma-seating-drop","kind":"test","tier":1,"title":"BIFMA X5.1 drop test","summary":"BIFMA X5.1 drop test releases a 1500 N load onto the seat from a 100 mm drop height, once; the seat pan and its fixings must not fracture — the mounting boss under the pan needs ≥ 3 mm wall around fasteners.","applies":["task chair","office chair"],"value":{"value":1500,"unit":"N"},"basis":"BIFMA X5.1-2017 §11 drop test","sources":["bifma-x5.1"],"tags":["test","drop","chair","impact"]},{"id":"test-chair-tipover","kind":"test","tier":1,"title":"BIFMA X5.1 tip / stability test","summary":"BIFMA X5.1 stability test applies a 400 N side load at the armrest with the seat at max height; the base footprint must keep the chair from tipping — base radius ≥ 330 mm (⌀660 mm) typically passes.","applies":["task chair","office chair base"],"value":{"value":400,"unit":"N"},"basis":"BIFMA X5.1-2017 §17 stability test, worst-case recline and reach","sources":["bifma-x5.1"],"tags":["test","stability","tip-over","chair"]},{"id":"test-desk-load","kind":"test","tier":1,"title":"BIFMA X5.5 worksurface static load test","summary":"BIFMA X5.5 static worksurface load test applies 730 N distributed over the top for 24 h with ≤ 6 mm permanent set allowed, plus a 450 N edge-load test at the front corner without tipping.","applies":["desk","table","worksurface"],"value":{"table":[{"test":"static top load","load":730,"unit":"N"},{"test":"edge load","load":450,"unit":"N"}]},"basis":"BIFMA X5.5-2014 §4/§8 static load and stability","sources":["bifma-x5.5"],"tags":["test","desk","static-load"]},{"id":"standard-ada-306-902","kind":"standard","tier":1,"title":"ADA 2010 §306/§902 — Knee clearance and work surfaces","summary":"ADA 2010 §306 sets knee/toe clearance under accessible worksurfaces and §902 sets accessible dining/work surface height at 730–865 mm — a fixed constraint any accessible desk design must clear.","applies":["desk","table","accessible workstation"],"basis":"US federal accessibility requirement for forward wheelchair approach to a worksurface","sources":["ada-2010"],"tags":["standard","accessibility","ada"]}]}