Nylon washers and EPDM / neoprene flat sealing washers: M2–M12 sizes from two nylon makers, rubber washer sizes and what the standards say — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/nylon-and-rubber-sealing-washers/ (sheet CC BY 4.0) Basis: Jetpress's DIN 125 nylon table, an RS Components nylon 6,6 datasheet and Aspen Fasteners' M12 sheet (nylon); Polymax's EPDM solid-washer list (rubber); mm; 8 envelope files for sizes where the makers agree Catalog version: 2026-10-20 Overall (mm): length 24.0, width 24.0, height 2.5 - Nylon (polyamide) flat washers follow the DIN 125 form A pattern, but they are described by the makers as 'similar to' it (Westfield). The two tables read here agree for M2, M2.5, M4 and M12 and differ for M3 (OD 7 against 8 mm), M5 (10 against 11), M6 (12.5 × 1.6 against 12 × 1.5), M8 (17 × 1.6 against 18 × 2) and M10 (21 × 2 against 22 × 2.5). Both are shown; the files are drawn only where they agree. Aspen's M12 sheet (DIN 125 Type A / ISO 7089, nylon 6/6) matches 13 × 24 × 2.5 mm and prints the tolerances (ID 13 to 13.27, OD 23.48 to 24, T 2.3 to 2.7). - Rubber sealing washers (EPDM, neoprene, silicone) are plain flat rings, and no ISO or DIN dimension standard for them was found. Polymax's EPDM list (black, 60 ShA) shows that the same label covers several sizes: 'M6' is 6.4 × 14, 6.4 × 12.5 or 6 × 22 mm, and 'M8' is 8 × 20, 8 × 24 or 8.5 × 17 mm, all 1.5 mm thick. Four of them are drawn (M4 4 × 9, M5 5.3 × 10, M6 6.4 × 12.5, M8 8.5 × 17) as examples; the label is the maker's. A neoprene flat-washer list (Superior Washer, inch sizes) was read, but it printed no screw size, no durometer and no units, so it is not used. - Bonded (metal-and-rubber) sealing washers are a separate part: see iso-1179-bspp-ports-and-bonded-seals for the bonded seal sizes. McMaster-Carr lists EPDM and neoprene sealing washers for screw sizes No. 2 to 1-1/4 in and M3 to M30 (its filters; no per-part rows were read), with per-part STEP on its own site. - Not tabled: neoprene or silicone sizes, shore hardness other than the 60 ShA Polymax lists, and FDA grades. Files are plain annuli at the printed ID, OD and thickness. washer size ID × OD × T (mm): Jetpress / Polymax ID × OD × T (mm): RS datasheet makers nylon flat washer M2 2.2 × 5 × 0.3 2.2 × 5 × 0.3 agree nylon flat washer M2.5 2.7 × 6 × 0.5 2.7 × 6 × 0.5 agree nylon flat washer M3 3.2 × 7 × 0.5 3.2 × 8 × 0.8 differ nylon flat washer M4 4.3 × 9 × 0.8 4.3 × 9 × 0.8 agree nylon flat washer M5 5.3 × 10 × 1 5.3 × 11 × 1 differ nylon flat washer M6 6.4 × 12.5 × 1.6 6.4 × 12 × 1.5 differ nylon flat washer M8 8.4 × 17 × 1.6 8.4 × 18 × 2 differ nylon flat washer M10 10.5 × 21 × 2 10.5 × 22 × 2.5 differ nylon flat washer M12 13 × 24 × 2.5 13 × 24 × 2.5 agree EPDM flat washer (Polymax) M4 4 × 9 × 1.5 – one maker EPDM flat washer (Polymax) M5 5.3 × 10 × 1.5 – one maker EPDM flat washer (Polymax) M6 6.4 × 12.5 × 1.5 – one maker EPDM flat washer (Polymax) M8 8.5 × 17 × 1.5 – one maker nylon M12 (Aspen, DIN 125A / ISO 7089) M12 13 × 24 × 2.5; ID 13 to 13.27, OD 23.48 to 24, T 2.3 to 2.7 – tolerances Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - Jetpress (maker): Nylon washer, standard, DIN 125: M2 to M20 ID (D1), OD (D2), thickness (T), mm — web — Publisher's page; dimensions are facts — https://www.jetpress.com/component-and-fastener-products/nylon-washer-standard-din-125/WAS162 - RS Components (datasheet): Nylon 6,6 washers, natural: M2 to M12 I/D, O/D, thickness (standard not named on the sheet) — web — Publisher's page; dimensions are facts — https://assets.rs-online.com/v1678197688/Datasheets/5266a488e57b01381baaa7ce517eb610.pdf - Aspen Fasteners: M12 DIN 125 Type A / ISO 7089 nylon 6/6 washer: ID 13 (13 to 13.27), OD 24 (23.48 to 24), thickness 2.5 (2.3 to 2.7) — web — Publisher's page; dimensions are facts — https://www.aspenfasteners.com/m12-din-125-type-a-iso-7089-7090-metric-standard-flat-washers-nylon-6-6/ - Polymax (maker), EPDM solid washers: EPDM solid washers, black, 60 ShA: ID x OD x thickness, as printed (no standard stated; 28 of 99 items read) — web — Publisher's page; dimensions are facts — https://m2dev.polymax.co.uk/en/seals/washers/solid-washers/epdm - McMaster-Carr: EPDM rubber sealing washers (screw sizes No. 2 to 1-1/4 in and M3 to M30 listed as filters; no per-part rows read) (free STEP 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/epdm-rubber-sealing-washers Free files (CC BY 4.0, Xem Studio; STEP + STL, 8 parts): https://xemstudio.com/files/hardware/nylon-and-rubber-sealing-washers/index.json API: https://xemstudio.com/api/geometry?object=nylon-and-rubber-sealing-washers