Spring lock washers, DIN 127 B (split washers, rectangular section): M2–M100 bore, outside diameter, width, thickness, free height — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/spring-lock-washers-din-127-b/ (sheet CC BY 4.0) Basis: Westfield Fasteners' DIN 127 table (type B, 2 to 100 mm), cross-checked on 15 sizes against McMaster-Carr's DIN 127B lock washer listing (ID, OD, thickness range); numbers only Catalog version: 2026-10-20 Sizes: see table below - DIN 127 B is the helical spring (split) lock washer with square ends and rectangular section. Columns (mm): d1 bore min and max; d2 outside max; b width of section; s thickness; h free height of type B, min and max; r as printed. Rows b and s are 19 values per table after the label cell: the page's own markup puts a dash in the label column (limit column), so the dash is not a value. McMaster-Carr's thickness ranges agree with s on all 15 sizes compared (e.g. M6 1.5 to 1.7 against s 1.6; M10 2.0 to 2.4 against s 2.2; M24 4.8 to 5.2 against s 5), and McMaster's ID / OD equal d1 max and d2 max for those sizes. - The last column shows McMaster-Carr's ID / OD / thickness range for the sizes it lists (M2, M2.5, M3, M4, M5, M6, M8, M10, M12, M16, M20, M24, M30, M36, M48). McMaster prints no width b. McMaster lists a few alternatives by finish (M3.5 3.9 or 3.6 mm bore in zinc steel; M27 27.5 or 28.5 mm) as printed there; Westfield's d1 for M27 is 27.5 min / 28.5 max, which explains the second value. - One printed anomaly dropped: Westfield's type B minimum free height for size 39 reads 2 (neighbours 12 and 14); it is shown as a typo and left out. Sizes above M24 are given by their nominal size only on the Westfield table (sizes 30 to 100 have no M prefix in the header). - Westfield's notes: DIN 127 applies to assemblies up to property class 5.8, reverse coil is recommended for left-hand threads, and type A (with prongs) is not tabulated here. The washer free height h is the coil height before tightening; the flat-state geometry (coil pitch, cut angle) is not given as numbers in the sources read, so no model is drawn. - McMaster-Carr sells DIN 127B lock washers with per-part STEP; its DIN 127B category is linked, not copied. size d1 min d1 max d2 max b s h type B min h type B max r McMaster ID / OD / thickness M2 2.1 2.4 4.4 0.9 0.5 1 1.2 0.1 2.4 / 4.4 / 0.4 to 0.6 M2.2 2.3 2.6 4.8 1 0.6 1.2 1.4 0.1 — M2.5 2.6 2.9 5.1 1 0.6 1.2 1.4 0.1 2.9 / 5.1 / 0.5 to 0.7 M3 3.1 3.4 6.2 1.3 0.8 1.6 1.9 0.2 3.4 / 6.2 / 0.7 to 0.9 M3.5 3.6 3.9 6.7 1.3 0.8 1.6 1.9 0.2 — M4 4.1 4.4 7.6 1.5 0.9 1.8 2.1 0.2 4.4 / 7.6 / 0.8 to 1.0 M5 5.1 5.4 9.2 1.8 1.2 2.4 2.8 0.2 5.4 / 9.2 / 1.1 to 1.3 M6 6.1 6.5 11.8 2.5 1.6 3.2 3.8 0.3 6.5 / 11.8 / 1.5 to 1.7 M7 7.1 7.5 12.8 2.5 1.6 3.2 3.8 0.3 — M8 8.1 8.5 14.8 3 2 4 4.7 0.5 8.5 / 14.8 / 1.9 to 2.1 M10 10.2 10.7 18.1 3.5 2.2 4.4 5.2 0.5 10.7 / 18.1 / 2.0 to 2.4 M12 12.2 12.7 21.1 4 2.5 5 5.9 1 12.7 / 21.1 / 2.3 to 2.7 M14 14.2 14.7 24.1 4.5 3 6 7.1 1 — M16 16.2 17 27.4 5 3.5 7 8.3 1 17.0 / 27.4 / 3.3 to 3.7 M18 18.2 19 29.4 5 3.5 7 8.3 1 — M20 20.2 21.2 33.6 6 4 8 9.4 1 21.2 / 33.6 / 3.8 to 4.2 M22 22.5 23.5 35.9 6 4 8 9.4 1 — M24 24.5 25.5 40 7 5 10 11.8 1.6 25.5 / 40.0 / 4.8 to 5.2 M27 27.5 28.5 43 7 5 10 11.8 1.6 — M30 30.5 31.7 48.2 8 6 12 14.2 1.6 31.7 / 48.2 / 5.8 to 6.2 M36 36.5 37.7 58.2 10 6 12 14.2 1.6 37.7 / 58.2 / 5.8 to 6.2 M39 39.5 40.7 61.2 10 6 — (printed 2; typo) 14.2 1.6 — 42 42.5 43.7 68.2 12 7 14 16.5 2 — 45 45.5 46.7 71.2 12 7 14 16.5 2 — 48 49 50.5 75 12 7 14 16.5 2 50.5 / 75.0 / 6.8 to 7.2 52 53 54.5 83 14 8 16 18.9 2 — 56 57 58.5 87 14 8 16 18.9 2 — 60 61 62.5 91 14 8 16 18.9 2 — 64 65 66.5 95 14 8 16 18.9 2 — 68 69 70.5 99 14 8 16 18.9 2 — 72 73 74.5 103 14 8 16 18.9 2 — 80 81 82.5 111 14 8 16 18.9 2 — 90 91 92.5 121 14 8 16 18.9 2 — 100 101 102.5 131 14 8 16 18.9 2 — Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - Westfield Fasteners: Helical spring washers, DIN 127 B rectangular section: d1 min / max, d2 max, b, s, h (type B), r, 2 to 100 mm — web — Publisher's page; dimensions are facts — https://www.westfieldfasteners.co.uk/Standards/Washer-SprgRec-M.html - McMaster-Carr: DIN 127 B split lock washers (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/din-127b-lock-washers No true-size file yet: the published figures do not fix the whole shape; a measured scan is planned. API: https://xemstudio.com/api/geometry?object=spring-lock-washers-din-127-b