# Hexagon nuts with collar, 1.5 d high, DIN 6331: M6–M36 across flats, collar diameter, height > What are the DIN 6331 collar nut dimensions (across flats, height, collar diameter and height) for M6 to M36? - Category: Hardware › Fasteners - Kind: Standard part - Basis: fasteners.eu DIN 6331 table (a, d1, e, m, s), cross-checked against Ganter's and AMF's DIN 6331 tables - Page: https://xemstudio.com/objects/hex-nuts-collar-din-6331/ · JSON: https://xemstudio.com/api/geometry?object=hex-nuts-collar-din-6331 · Plain text: https://xemstudio.com/objects/hex-nuts-collar-din-6331/sheet.txt - License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license - Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/) **Exact dimensions.** Every file is drawn at true size with no tolerance added. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your process's clearance before making the part. ## Notes - Columns: thread, width across flats s, total height m (1.5 d), collar diameter d1, collar height a. Ganter and AMF give the same values (e.g. M12: SW18, m 18, collar Ø25 × 4). - M14 is omitted (sources disagree on the collar height); M10 and M12 are also sold as SW17 / SW19 variants. Thread drawn as a plain bore at the major diameter. ## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn) | feature | exact | mates with | fit | files | |---|---|---|---|---| | collar | Ø d1 × a: 14 × 3 (M6) to 68 × 10 (M36); M12 25 × 4 | workpiece or clamp-strap face (no washer) | designed | all | | thread (plain bore at the major Ø) | d: M6 to M36 | fixture stud of the same thread | designed | all | ## Sizes | thread | s | m | d1 | a | |---|---|---|---|---| | M6 | 10 | 9 | 14 | 3 | | M8 | 13 | 12 | 18 | 3.5 | | M10 | 16 | 15 | 22 | 4 | | M12 | 18 | 18 | 25 | 4 | | M16 | 24 | 24 | 31 | 5 | | M20 | 30 | 30 | 37 | 6 | | M24 | 36 | 36 | 45 | 6 | | M30 | 46 | 45 | 58 | 8 | | M36 | 55 | 54 | 68 | 10 | ## Where the files are - fasteners.eu: [DIN 6331 hexagon nuts with collar, height 1.5 d: a, d1, e, m, s](https://www.fasteners.eu/standards/DIN/6331/) — web — Publisher's page; dimensions are facts - Ganter: [DIN 6331 hex nuts with collar](https://reiman.pt/pub/media/technical_data/GANTER/datasheets/DIN 6331.pdf) — web — Publisher's page; dimensions are facts - AMF: [Hexagonal nuts with collar 1.5 d high](https://www.amf.de/en_us/hexagonal-nuts-with-collar-15-d-high-82230) — web — Publisher's page; dimensions are facts ## Free STEP/STL (9 parts, CC BY 4.0, Xem Studio) Index: https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/index.json - din6331-m6: [STEP](https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m6.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m6.stl) — DIN 6331 M6: SW10, height 9, collar Ø14×3 - din6331-m8: [STEP](https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m8.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m8.stl) — DIN 6331 M8: SW13, height 12, collar Ø18×3.5 - din6331-m10: [STEP](https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m10.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m10.stl) — DIN 6331 M10: SW16, height 15, collar Ø22×4 - din6331-m12: [STEP](https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m12.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m12.stl) — DIN 6331 M12: SW18, height 18, collar Ø25×4 - din6331-m16: [STEP](https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m16.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m16.stl) — DIN 6331 M16: SW24, height 24, collar Ø31×5 - din6331-m20: [STEP](https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m20.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m20.stl) — DIN 6331 M20: SW30, height 30, collar Ø37×6 - din6331-m24: [STEP](https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m24.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m24.stl) — DIN 6331 M24: SW36, height 36, collar Ø45×6 - din6331-m30: [STEP](https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m30.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m30.stl) — DIN 6331 M30: SW46, height 45, collar Ø58×8 - din6331-m36: [STEP](https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m36.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m36.stl) — DIN 6331 M36: SW55, height 54, collar Ø68×10 ## Questions **What are the dimensions of an M12 DIN 6331 nut?** 18 mm across flats, 18 mm tall, Ø25 × 4 mm collar. **Why use a collar nut on a fixture?** The collar spreads the clamping load without a loose washer, and the 1.5 d height takes repeated clamping. ## Fits with - [T-slot nuts, DIN 508: M4–M22 for 5–24 mm T-slots, neck width, base, height](https://xemstudio.com/objects/t-slot-nuts-din-508/) - [Hex flange nuts, DIN 6923: M3–M20 across flats, flange diameter, height, flange thickness + M5–M16 envelope files](https://xemstudio.com/objects/flange-nuts-din-6923/) - [Coupling nuts / long hex nuts: DIN 6334 M8–M36 (height 3 d) and inch rod coupling nuts 1/4 to 1 in — across flats, length + M8–M36 envelope models](https://xemstudio.com/objects/coupling-nuts-din-6334-and-inch/) - [Hex nuts, M10 to M24 (ISO 4032 / DIN 934)](https://xemstudio.com/objects/hex-nuts-metric-m10-m24/)