Tooth lock washers, inch (ASME B18.21.1): internal and external tooth star washers, #2 to 1 in, ID, OD, thickness + ring envelopes — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/tooth-lock-washers-inch-asme-b18-21-1/ (sheet CC BY 4.0) Basis: AFT Fasteners and Tanner Bolt (internal tooth, ASME B18.21.1-2009, identical numbers) and Tanner Bolt with Aspen Fasteners (external tooth, B18.21.1-2009 and -1999, identical numbers); 20 ring envelopes as files Catalog version: 2026-10-20 Overall (mm): length 31.6, width 31.6, height 1.7 - Inches (OD also in mm). Internal tooth: #2 to 1-1/4 in; external tooth: #2 to 1 in. Each row: nominal size, inside diameter max / min, outside diameter max / min, thickness max / min. AFT's and Tanner's internal-tooth tables carry the same numbers for every size. Tanner's external table (2009) and Aspen's (1999) also agree on every size, including the odd 'nominal' of 0.086 / 0.563 for #2 and 9/16 (Aspen rounds 9/16 to .563; Tanner prints .5625). - Column reading: the PDFs print a leading decimal that is the size's nominal diameter, then the inside diameter pair (larger first on the sources that label it 'max'), the outside pair and the thickness pair. The labels in the extracted PDFs are partly garbled, so max / min follow the larger / smaller of each pair; check against the standard if a figure matters. One AFT / Tanner row not tabulated: '1/8 pipe' (a pipe-size washer printed with a different column pattern). - Number of teeth is not printed in any table read here, and is left out. Tooth shape (twist angle, tooth width) is not published as numbers. - Files: rings (annuli) at the ID min and OD max of the washer and the maximum thickness, for #4, #6, #8, #10, 1/4, 5/16, 3/8, 1/2, 5/8 and 3/4 in, internal and external. Teeth, their twist and the washer's spring are not modelled. McMaster-Carr sells tooth lock washers with per-part STEP; linked, not copied. Metric forms: serrated-lock-washers-din-6798. Split washers: split-lock-washers-inch-asme-b18-21-1. type size nominal (in) ID max / min (in) OD max / min (in) thickness max / min (in) OD max (mm) internal tooth #2 0.086 0.095 / 0.089 0.200 / 0.175 0.016 / 0.010 5.08 internal tooth #3 0.099 0.109 / 0.102 0.232 / 0.215 0.016 / 0.010 5.89 internal tooth #4 0.112 0.123 / 0.115 0.270 / 0.245 0.018 / 0.012 6.86 internal tooth #5 0.125 0.136 / 0.129 0.280 / 0.255 0.020 / 0.014 7.11 internal tooth #6 0.138 0.150 / 0.141 0.295 / 0.275 0.022 / 0.016 7.49 internal tooth #8 0.164 0.176 / 0.168 0.340 / 0.325 0.023 / 0.018 8.64 internal tooth #10 0.19 0.204 / 0.195 0.381 / 0.365 0.024 / 0.018 9.68 internal tooth #12 0.216 0.231 / 0.221 0.410 / 0.394 0.027 / 0.020 10.41 internal tooth 1/4 0.25 0.267 / 0.256 0.478 / 0.460 0.028 / 0.023 12.14 internal tooth 5/16 0.312 0.332 / 0.320 0.610 / 0.594 0.034 / 0.028 15.49 internal tooth 3/8 0.375 0.398 / 0.384 0.692 / 0.670 0.040 / 0.032 17.58 internal tooth 7/16 0.438 0.464 / 0.448 0.789 / 0.740 0.040 / 0.032 20.04 internal tooth 1/2 0.5 0.530 / 0.512 0.900 / 0.867 0.045 / 0.037 22.86 internal tooth 9/16 0.5625 0.596 / 0.576 0.985 / 0.957 0.045 / 0.037 25.02 internal tooth 5/8 0.625 0.663 / 0.640 1.071 / 1.045 0.050 / 0.042 27.20 internal tooth 3/4 0.75 0.795 / 0.769 1.245 / 1.220 0.055 / 0.047 31.62 internal tooth 7/8 0.875 0.927 / 0.894 1.410 / 1.364 0.060 / 0.052 35.81 internal tooth 1 1. 1.060 / 1.019 1.637 / 1.590 0.067 / 0.059 41.58 internal tooth 1-1/8 1.125 1.192 / 1.144 1.830 / 1.799 0.067 / 0.059 46.48 internal tooth 1-1/4 1.25 1.325 / 1.275 1.975 / 1.921 0.067 / 0.059 50.16 external tooth #2 0.086 0.095 / 0.086 0.189 / 0.177 0.013 / 0.010 4.80 external tooth #3 0.099 0.109 / 0.102 0.235 / 0.220 0.016 / 0.010 5.97 external tooth #4 0.112 0.123 / 0.115 0.260 / 0.245 0.018 / 0.012 6.60 external tooth #5 0.125 0.136 / 0.129 0.285 / 0.270 0.020 / 0.014 7.24 external tooth #6 0.138 0.150 / 0.141 0.320 / 0.305 0.022 / 0.016 8.13 external tooth #8 0.164 0.176 / 0.168 0.381 / 0.365 0.023 / 0.018 9.68 external tooth #10 0.19 0.204 / 0.195 0.410 / 0.395 0.024 / 0.018 10.41 external tooth #12 0.216 0.231 / 0.221 0.475 / 0.460 0.027 / 0.020 12.06 external tooth 1/4 0.25 0.267 / 0.256 0.510 / 0.494 0.028 / 0.023 12.95 external tooth 5/16 0.312 0.332 / 0.320 0.610 / 0.588 0.034 / 0.028 15.49 external tooth 3/8 0.375 0.398 / 0.384 0.694 / 0.670 0.040 / 0.032 17.63 external tooth 7/16 0.438 0.464 / 0.448 0.760 / 0.740 0.040 / 0.032 19.30 external tooth 1/2 0.5 0.530 / 0.513 0.900 / 0.880 0.045 / 0.037 22.86 external tooth 9/16 0.563 0.596 / 0.576 0.985 / 0.960 0.045 / 0.037 25.02 external tooth 5/8 0.625 0.663 / 0.641 1.070 / 1.045 0.050 / 0.042 27.18 external tooth 3/4 0.75 0.795 / 0.768 1.260 / 1.220 0.055 / 0.047 32.00 external tooth 7/8 0.875 0.927 / 0.897 1.410 / 1.380 0.060 / 0.052 35.81 external tooth 1 1. 1.060 / 1.025 1.620 / 1.590 0.067 / 0.059 41.15 Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - AFT Fasteners: Internal tooth lock washer (ASME B18.21.1-2009): nominal, ID max / min, OD max / min, thickness max / min — web — Publisher's page; dimensions are facts — https://www.aftfasteners.com/internal-tooth-lock-washer/ - Tanner Bolt: Internal tooth lock washers, ASME B18.21.1-2009 (PDF) — web — Maker datasheet; numbers only — https://www.tannerbolt.com/media/akeneo_connector/Washersinternal.pdf - Tanner Bolt: External tooth lock washers, ASME B18.21.1-2009 (PDF) — web — Maker datasheet; numbers only — https://www.tannerbolt.com/media/akeneo_connector/Washersexternal.pdf - Aspen Fasteners: External tooth lockwasher specification (ASME B18.21.1-1999) — web — Distributor datasheet; numbers only — https://www.aspenfasteners.com/content/pdf/external_tooth_lockwasher_specification.pdf - McMaster-Carr: Internal tooth 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/products/internal-tooth-lock-washers/ - McMaster-Carr: Internal-external tooth 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/shims/internal-external-tooth-lock-washers Free files (CC BY 4.0, Xem Studio; STEP + STL, 20 parts): https://xemstudio.com/files/hardware/tooth-lock-washers-inch-asme-b18-21-1/index.json API: https://xemstudio.com/api/geometry?object=tooth-lock-washers-inch-asme-b18-21-1