Plain washers, inch Type B (narrow, regular, wide): #0 to 3 in ID, OD, thickness + 12 washer files — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/plain-washers-inch-type-b/ (sheet CC BY 4.0) Basis: Tubing China's ANSI Type B flat washer table (#0 to 3 in), checked against Portland Bolt's Type B table (1/4 to 3 in, same ID, OD and thickness on every row read) and Fastener SuperStore's narrow-series limits; twelve washer files Catalog version: 2026-10-20 Overall (mm): length 63.5, width 63.5, height 4.1 - Type B plain washers come in three series for each screw size: narrow (N), regular (R) and wide (W), with a bore that is the same across the three. Dimensions are basic inches with computed mm columns. Basic ID, OD and thickness are the same in Tubing China's and Portland Bolt's tables for every size from 1/4 to 3 in. Fastener SuperStore's narrow-series table (labelled ASME B18.21.1-2009) prints limits that fit the same basics: 1/4 in ID 0.296 / 0.276 around 0.281, OD 0.515 / 0.495 around 0.500, thickness 0.071 / 0.056 around 0.063 (and the same pattern at 3/8, 1/2 in). Standard naming varies by source: Portland Bolt's page is titled 'Type B plain washers', Fastener SuperStore cites ASME B18.21.1-2009, and Engineers Edge's Type A table is credited to ANSI/ASME B18.22.1. Check the edition you buy to. - Portland Bolt prints some obvious slips (a tolerance of 0.303 and a 1-in narrow maximum thickness of 0.122); basic values are used, not tolerances. The Portland Bolt table has the thickness header shifted by one column; its 'basic' thickness (0.063 for 1/4 narrow) is the one used. Portland Bolt's 7/8 and 1 in series rows and the extra half sizes were not all compared. - Type A (SAE narrow / USS wide) washers, 1/4 to 3/4 in, are on flat-washers-inch. Type B is the series with a bore that is about 0.031 in over the screw for the same series, so the 1/4 in Type B wide washer (ID 0.281, OD 1.000) is not the 1/4 in USS Type A washer (ID 0.312, OD 0.734). - Files are Xem-drawn flat annuli at the basic sizes for 1/4, 3/8, 1/2 and 3/4 in in all three series; thickness is the basic value. McMaster-Carr sells these washers with per-part STEP; no category URL could be verified, so none is linked. screw size decimal size (in) series ID (in) OD (in) thickness (in) ID (mm) OD (mm) thickness (mm) #0 0.06 narrow 0.068 0.125 0.025 1.73 3.17 0.64 #0 0.06 regular 0.068 0.188 0.025 1.73 4.78 0.64 #0 0.06 wide 0.068 0.250 0.025 1.73 6.35 0.64 #1 0.073 narrow 0.084 0.156 0.025 2.13 3.96 0.64 #1 0.073 regular 0.084 0.219 0.025 2.13 5.56 0.64 #1 0.073 wide 0.084 0.281 0.032 2.13 7.14 0.81 #2 0.086 narrow 0.094 0.188 0.025 2.39 4.78 0.64 #2 0.086 regular 0.094 0.250 0.032 2.39 6.35 0.81 #2 0.086 wide 0.094 0.344 0.032 2.39 8.74 0.81 #3 0.099 narrow 0.109 0.219 0.025 2.77 5.56 0.64 #3 0.099 regular 0.109 0.312 0.032 2.77 7.92 0.81 #3 0.099 wide 0.109 0.406 0.040 2.77 10.31 1.02 #4 0.112 narrow 0.125 0.250 0.032 3.17 6.35 0.81 #4 0.112 regular 0.125 0.375 0.040 3.17 9.52 1.02 #4 0.112 wide 0.125 0.438 0.040 3.17 11.13 1.02 #5 0.125 narrow 0.141 0.281 0.032 3.58 7.14 0.81 #5 0.125 regular 0.141 0.406 0.040 3.58 10.31 1.02 #5 0.125 wide 0.141 0.500 0.040 3.58 12.70 1.02 #6 0.138 narrow 0.156 0.312 0.032 3.96 7.92 0.81 #6 0.138 regular 0.156 0.438 0.040 3.96 11.13 1.02 #6 0.138 wide 0.156 0.562 0.040 3.96 14.27 1.02 #8 0.164 narrow 0.188 0.375 0.040 4.78 9.52 1.02 #8 0.164 regular 0.188 0.500 0.040 4.78 12.70 1.02 #8 0.164 wide 0.188 0.625 0.063 4.78 15.88 1.60 #10 0.19 narrow 0.203 0.406 0.040 5.16 10.31 1.02 #10 0.19 regular 0.203 0.562 0.040 5.16 14.27 1.02 #10 0.19 wide 0.203 0.734 0.063 5.16 18.64 1.60 #12 0.216 narrow 0.234 0.438 0.040 5.94 11.13 1.02 #12 0.216 regular 0.234 0.625 0.063 5.94 15.88 1.60 #12 0.216 wide 0.234 0.875 0.063 5.94 22.22 1.60 1/4 0.25 narrow 0.281 0.500 0.063 7.14 12.70 1.60 1/4 0.25 regular 0.281 0.734 0.063 7.14 18.64 1.60 1/4 0.25 wide 0.281 1.000 0.063 7.14 25.40 1.60 5/16 0.3125 narrow 0.344 0.625 0.063 8.74 15.88 1.60 5/16 0.3125 regular 0.344 0.875 0.063 8.74 22.22 1.60 5/16 0.3125 wide 0.344 1.125 0.063 8.74 28.57 1.60 3/8 0.375 narrow 0.406 0.734 0.063 10.31 18.64 1.60 3/8 0.375 regular 0.406 1.000 0.063 10.31 25.40 1.60 3/8 0.375 wide 0.406 1.250 0.100 10.31 31.75 2.54 7/16 0.4375 narrow 0.469 0.875 0.063 11.91 22.22 1.60 7/16 0.4375 regular 0.469 1.125 0.063 11.91 28.57 1.60 7/16 0.4375 wide 0.469 1.469 0.100 11.91 37.31 2.54 1/2 0.5 narrow 0.531 1.000 0.063 13.49 25.40 1.60 1/2 0.5 regular 0.531 1.250 0.100 13.49 31.75 2.54 1/2 0.5 wide 0.531 1.750 0.100 13.49 44.45 2.54 9/16 0.5625 narrow 0.594 1.125 0.063 15.09 28.57 1.60 9/16 0.5625 regular 0.594 1.469 0.100 15.09 37.31 2.54 9/16 0.5625 wide 0.594 2.000 0.100 15.09 50.80 2.54 5/8 0.625 narrow 0.656 1.250 0.100 16.66 31.75 2.54 5/8 0.625 regular 0.656 1.750 0.100 16.66 44.45 2.54 5/8 0.625 wide 0.656 2.250 0.160 16.66 57.15 4.06 3/4 0.75 narrow 0.812 1.375 0.100 20.62 34.92 2.54 3/4 0.75 regular 0.812 2.000 0.100 20.62 50.80 2.54 3/4 0.75 wide 0.812 2.500 0.160 20.62 63.50 4.06 7/8 0.875 narrow 0.938 1.469 0.100 23.83 37.31 2.54 7/8 0.875 regular 0.938 2.250 0.160 23.83 57.15 4.06 7/8 0.875 wide 0.938 2.750 0.160 23.83 69.85 4.06 1 1 narrow 1.062 1.750 0.100 26.97 44.45 2.54 1 1 regular 1.062 2.500 0.160 26.97 63.50 4.06 1 1 wide 1.062 3.000 0.160 26.97 76.20 4.06 1-1/8 1.125 narrow 1.188 2.000 0.100 30.18 50.80 2.54 1-1/8 1.125 regular 1.188 2.750 0.160 30.18 69.85 4.06 1-1/8 1.125 wide 1.188 3.250 0.160 30.18 82.55 4.06 1-1/4 1.25 narrow 1.312 2.250 0.160 33.32 57.15 4.06 1-1/4 1.25 regular 1.312 3.000 0.160 33.32 76.20 4.06 1-1/4 1.25 wide 1.312 3.500 0.250 33.32 88.90 6.35 1-1/2 1.5 narrow 1.562 2.750 0.160 39.67 69.85 4.06 1-1/2 1.5 regular 1.562 3.500 0.250 39.67 88.90 6.35 1-1/2 1.5 wide 1.562 4.000 0.250 39.67 101.60 6.35 2 2 narrow 2.125 3.750 0.250 53.97 95.25 6.35 2 2 regular 2.125 4.500 0.250 53.97 114.30 6.35 2 2 wide 2.125 5.000 0.250 53.97 127.00 6.35 3 3 narrow 3.125 5.500 0.375 79.38 139.70 9.52 3 3 regular 3.125 6.500 0.375 79.38 165.10 9.52 3 3 wide 3.125 7.000 0.375 79.38 177.80 9.52 Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - Tubing China: Standard ANSI Type B flat washer sizes: No. 0 to 3 in, N / R / W series, ID, OD, thickness — web — Distributor table; numbers only — https://tubingchina.com/Standard-ANSI-Type-B-Flat-Washer-Sizes.htm - Portland Bolt: Dimensions of Type B plain washers: narrow / regular / wide, 1/4 to 3 in (ID, OD, thickness basic / max / min) — web — Distributor table; numbers only — https://www.portlandbolt.com/print/?table=9931 - Fastener SuperStore: Type B plain washers, narrow series (ASME B18.21.1-2009): ID, OD, thickness max / min — web — Distributor table; numbers only — https://www.fastenersuperstore.com/product_specs/washers-flat-type-b-narrow Free files (CC BY 4.0, Xem Studio; STEP + STL, 12 parts): https://xemstudio.com/files/hardware/plain-washers-inch-type-b/index.json API: https://xemstudio.com/api/geometry?object=plain-washers-inch-type-b