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Spring lock washers, DIN 127 B (split washers, rectangular section): M2–M100 bore, outside diameter, width, thickness, free height
What are the dimensions of a DIN 127 B spring washer, and what is the outside diameter of an M8 split lock washer? · Standard part · 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
Also called: din 127 b dimensions, m8 spring washer dimensions, m10 split lock washer outside diameter, m6 spring washer thickness, din 127 m12, lock washer m5 dimensions, m3 split washer size, din 127 b m16 17 mm, spring washer free height, split lock washer metric size chart, din 127 b vs din 6798
Exact dimensions. True size, with no tolerance added.
- sizes
- 34 in table
Notes
- 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.
Spring lock washers, DIN 127 B (split washers, rectangular section)… size chart
| 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 | — |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| 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 |
| 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 |
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Questions
What are the dimensions of an M8 DIN 127 B spring washer?
Bore 8.1 to 8.5 mm, outside diameter 14.8 mm max, width b 3, thickness s 2, free height 4 to 4.7 mm (Westfield); McMaster lists 8.5 ID, 14.8 OD, thickness 1.9 to 2.1.
What is the outside diameter of an M10 split lock washer?
18.1 mm max (DIN 127 B, Westfield and McMaster agree); bore 10.2 to 10.7 mm, s 2.2.