# Knurled thumb screws, low type (DIN 653), M1–M10: head diameter, head height, shank, nominal lengths + 6 models

> What are the dimensions of a DIN 653 low-profile knurled thumb screw (M3, M4, M5, M6, M8)?

- Category: Hardware › Fasteners
- Kind: Standard part
- Basis: fasten.it's DIN 653 table (08/2006) and mass grid (nominal lengths) with Westfield Fasteners' table (dk nominal / max / min, k min, knurl pitch, shank limits); six envelope models as files
- Page: https://xemstudio.com/objects/thumb-screws-din-653-low-type/ · JSON: https://xemstudio.com/api/geometry?object=thumb-screws-din-653-low-type · Plain text: https://xemstudio.com/objects/thumb-screws-din-653-low-type/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/)

## Overall (mm)

| length | width | height |
|---|---|---|
| 36.0 | 36.0 | 28.0 |

**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

- Millimetres, M1 to M10. DIN 653 is the low type of the knurled thumb screw (DIN 464 is the high type: knurled-thumb-screws-din-464). Columns: pitch P, a1 max (neither source defines it), head diameter dk (nominal, with Westfield's max / min), shank diameter d max / min (Westfield's pair, from M2 up), head height k (nominal = max; Westfield also gives k min), top-edge radius r max, minimum knurl pitch, and the nominal length range from fasten.it's mass table. The lengths between the ends are not listed here (the mass grid was not reproduced).
- The two sources agree on dk, P, a1 and r for every size. Their column letters differ: what fasten.it labels 'e' (e.g. 4 for M6) Westfield labels 'ds', and what fasten.it labels 'k max' (5 for M6) Westfield labels 'e nom = max' and also gives 'k min' (4.7). Neither source defines these letters; the table uses k (5 mm for M6, the value both sources print as the head height max / nominal), and the third dimension is left out. The page does not give a thread length b, a slot size or a knurl profile (none is printed), so none is shown.
- Files: a plain head cylinder at dk (nominal) and k on a plain shank at the nominal thread diameter. Each is the shortest length in fasten.it's list for that size (an example, Xem's choice of the end of the range). No knurl, chamfer, edge radius or thread is modelled because none is published as numbers.
- McMaster-Carr sells DIN 653 thumb screws with per-part STEP, and Halder (maker) has a data sheet; both linked, not copied.

## 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 |
|---|---|---|---|---|
| shank (thread drawn as plain cylinder) | Ø3 (M3), 4, 5, 6, 8, 10 mm | tapped hole or nut of the same thread (plain cylinder at the major diameter) | designed | thumb-screw-din-653-* |
| head | Ø12 × 2.5 (M3), 16 × 3.5, 20 × 4, 24 × 5, 30 × 6, 36 × 8 mm | clearance round the head for fingers; counterbore if recessed | designed | thumb-screw-din-653-* |

## Sizes

| size | pitch P (mm) | a1 max (mm) | head dk nominal (max / min) (mm) | shank d max / min (mm, Westfield) | head height k nominal = max / min (mm) | r max (mm) | knurl pitch min (mm) | nominal lengths (mm, fasten.it) |
|---|---|---|---|---|---|---|---|---|
| M1 | 0.25 | 0.75 | 5.5 (5.74 / 5.26) | — | 1.5 / 1.25 | 0.5 | 0.5 | 2 – 6 |
| M1.2 | 0.25 | 0.75 | 6 (6.24 / 5.76) | — | 1.5 / 1.25 | 0.5 | 0.5 | 2 – 8 |
| M1.4 | 0.3 | 0.9 | 7 (7.29 / 6.71) | — | 2 / 1.75 | 0.5 | 0.5 | 3 – 10 |
| M1.6 | 0.35 | 1.05 | 7.5 (7.79 / 7.29) | — | 2 / 1.75 | 0.5 | 0.5 | 3 – 12 |
| M2 | 0.4 | 1.2 | 9 (9.29 / 8.71) | 2.00 / 1.86 | 2 / 1.75 | 0.5 | 0.5 | 4 – 16 |
| M2.5 | 0.45 | 1.35 | 11 (11.35 / 10.65) | 2.50 / 2.36 | 2.5 / 2.25 | 0.5 | 0.6 | 5 – 18 |
| M3 | 0.5 | 1.5 | 12 (12.35 / 11.65) | 3.00 / 2.86 | 2.5 / 2.25 | 0.5 | 0.6 | 6 – 20 |
| M4 | 0.7 | 2.1 | 16 (16.35 / 15.65) | 4.00 / 3.82 | 3.5 / 3.2 | 0.5 | 0.6 | 8 – 25 |
| M5 | 0.8 | 2.4 | 20 (20.42 / 19.58) | 5.00 / 4.82 | 4 / 3.7 | 1 | 0.6 | 10 – 30 |
| M6 | 1 | 3 | 24 (24.42 / 23.58) | 6.00 / 5.82 | 5 / 4.7 | 1 | 0.6 | 12 – 30 |
| M8 | 1.25 | 3.75 | 30 (30.42 / 29.58) | 8.00 / 7.78 | 6 / 5.7 | 2 | 0.6 | 16 – 35 |
| M10 | 1.5 | 4.5 | 36 (36.5 / 35.5) | 10.00 / 9.78 | 8 / 7.64 | 2 | 0.8 | 20 – 40 |

## Where the files are

- fasten.it: [DIN 653 knurled thumb screws, low type, 08/2006: pitch, a1, dk, ds, e, k max, r; mass table with nominal lengths (M1 to M10)](https://fasten.it/en/norms/norm/din_653) — web — Reference page; numbers only
- Westfield Fasteners: [DIN 653 knurled thumb screws, low type: p, a max, c, dk nom / max / min, k min, r max, knurl pitch (M1 to M10)](https://westfieldfasteners.co.uk/Standards/ScrewBolt-ThumbLow-M.html) — web — Publisher's page; dimensions are facts
- McMaster-Carr: [DIN 653 thumb screws (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/thumb-screws/specifications-met~din-653) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)
- Halder (maker): [DIN 653 knurled thumb screws, low type (maker data sheet / CAD)](https://halder.fr/en_fr/file-download/object_file_dsag_eh24770fr_en) — web, PDF — Maker / distributor page; dimensions are facts (verify at link)

## Free STEP/STL (6 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/thumb-screws-din-653-low-type/index.json

- thumb-screw-din-653-m3-x6-envelope: [STEP](https://xemstudio.com/files/hardware/thumb-screws-din-653-low-type/thumb-screw-din-653-m3-x6-envelope.step) · [STL](https://xemstudio.com/files/hardware/thumb-screws-din-653-low-type/thumb-screw-din-653-m3-x6-envelope.stl) — DIN 653 M3 knurled thumb screw envelope: plain head cylinder Ø12 × 2.5 mm (dk nominal, k nominal = max) on a plain Ø3 shank 6 mm under the head; the 6 mm length is the shortest in fasten.it's list for this size, an example; no knurl, slot, chamfer or edge radius, thread drawn plain
- thumb-screw-din-653-m4-x8-envelope: [STEP](https://xemstudio.com/files/hardware/thumb-screws-din-653-low-type/thumb-screw-din-653-m4-x8-envelope.step) · [STL](https://xemstudio.com/files/hardware/thumb-screws-din-653-low-type/thumb-screw-din-653-m4-x8-envelope.stl) — DIN 653 M4 knurled thumb screw envelope: plain head cylinder Ø16 × 3.5 mm (dk nominal, k nominal = max) on a plain Ø4 shank 8 mm under the head; the 8 mm length is the shortest in fasten.it's list for this size, an example; no knurl, slot, chamfer or edge radius, thread drawn plain
- thumb-screw-din-653-m5-x10-envelope: [STEP](https://xemstudio.com/files/hardware/thumb-screws-din-653-low-type/thumb-screw-din-653-m5-x10-envelope.step) · [STL](https://xemstudio.com/files/hardware/thumb-screws-din-653-low-type/thumb-screw-din-653-m5-x10-envelope.stl) — DIN 653 M5 knurled thumb screw envelope: plain head cylinder Ø20 × 4 mm (dk nominal, k nominal = max) on a plain Ø5 shank 10 mm under the head; the 10 mm length is the shortest in fasten.it's list for this size, an example; no knurl, slot, chamfer or edge radius, thread drawn plain
- thumb-screw-din-653-m6-x12-envelope: [STEP](https://xemstudio.com/files/hardware/thumb-screws-din-653-low-type/thumb-screw-din-653-m6-x12-envelope.step) · [STL](https://xemstudio.com/files/hardware/thumb-screws-din-653-low-type/thumb-screw-din-653-m6-x12-envelope.stl) — DIN 653 M6 knurled thumb screw envelope: plain head cylinder Ø24 × 5 mm (dk nominal, k nominal = max) on a plain Ø6 shank 12 mm under the head; the 12 mm length is the shortest in fasten.it's list for this size, an example; no knurl, slot, chamfer or edge radius, thread drawn plain
- thumb-screw-din-653-m8-x16-envelope: [STEP](https://xemstudio.com/files/hardware/thumb-screws-din-653-low-type/thumb-screw-din-653-m8-x16-envelope.step) · [STL](https://xemstudio.com/files/hardware/thumb-screws-din-653-low-type/thumb-screw-din-653-m8-x16-envelope.stl) — DIN 653 M8 knurled thumb screw envelope: plain head cylinder Ø30 × 6 mm (dk nominal, k nominal = max) on a plain Ø8 shank 16 mm under the head; the 16 mm length is the shortest in fasten.it's list for this size, an example; no knurl, slot, chamfer or edge radius, thread drawn plain
- thumb-screw-din-653-m10-x20-envelope: [STEP](https://xemstudio.com/files/hardware/thumb-screws-din-653-low-type/thumb-screw-din-653-m10-x20-envelope.step) · [STL](https://xemstudio.com/files/hardware/thumb-screws-din-653-low-type/thumb-screw-din-653-m10-x20-envelope.stl) — DIN 653 M10 knurled thumb screw envelope: plain head cylinder Ø36 × 8 mm (dk nominal, k nominal = max) on a plain Ø10 shank 20 mm under the head; the 20 mm length is the shortest in fasten.it's list for this size, an example; no knurl, slot, chamfer or edge radius, thread drawn plain

## Questions

**What are the DIN 653 M6 head dimensions?**

Head Ø24 mm (24.42 / 23.58), height 5 mm (4.7 min); lengths 12 to 30 mm (fasten.it).

**What is the difference between DIN 653 and DIN 464?**

DIN 653 is the low type (M6 head 5 mm high); DIN 464 is the high type with a slotted head.

**What head size is an M4 DIN 653 thumb screw?**

Ø16 mm (16.35 / 15.65), height 3.5 mm; lengths 8 to 25 mm.

## Fits with

- [Knurled thumb screws, high type (DIN 464), M2–M10: head diameter, head height, shank, thread length, slot](https://xemstudio.com/objects/knurled-thumb-screws-din-464/)
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- [Star knobs, DIN 6336 (cast iron), Ø32–80: thread, bore, height and depth](https://xemstudio.com/objects/star-knobs-din-6336/)
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