# Set-screw shaft collars Ø3 to Ø12

> What are the dimensions of a shaft collar for a 5 mm or 8 mm shaft?

- Category: Hardware › Motion
- Kind: Hardware
- Basis: Metric set-screw collar envelopes; bore = shaft Ø, radial tapped hole at the ISO tap drill
- Page: https://xemstudio.com/objects/shaft-collars/ · JSON: https://xemstudio.com/api/geometry?object=shaft-collars · Plain text: https://xemstudio.com/objects/shaft-collars/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses

**Exact dimensions.** Every file is drawn at true size with no printing tolerance. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your printer's or process's clearance before making the part.

## Notes

- A ring with one radial tapped hole at mid-width: bore Ø × OD × width and screw: 3 × 8 × 5 M3; 4 × 9 × 5 M3; 5 × 10 × 6 M3; 6 × 12 × 7 M3; 8 × 16 × 8 M4; 10 × 20 × 10 M4; 12 × 22 × 10 M5.
- The bore is the shaft Ø exactly; the screw hole is drawn at the tap drill: Ø2.5 (M3), Ø3.3 (M4), Ø4.2 (M5).
- A collar each side of a bearing locates a shaft along its axis; the set screw seats on the shaft's D-flat.

## 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 bore | Ø3–Ø12 (= shaft Ø) | shaft of the same Ø | slide | collar-* |
| collar set-screw hole | Ø2.5 / Ø3.3 / Ø4.2 | M3 / M4 / M5 tap drill | designed | collar-* |

## Sizes

| file | bore | OD | width | screw | tap drill |
|---|---|---|---|---|---|
| collar-3mm | 3 | 8 | 5 | M3 | 2.5 |
| collar-4mm | 4 | 9 | 5 | M3 | 2.5 |
| collar-5mm | 5 | 10 | 6 | M3 | 2.5 |
| collar-6mm | 6 | 12 | 7 | M3 | 2.5 |
| collar-8mm | 8 | 16 | 8 | M4 | 3.3 |
| collar-10mm | 10 | 20 | 10 | M4 | 3.3 |
| collar-12mm | 12 | 22 | 10 | M5 | 4.2 |

## Where the files are

- Wikipedia: [Circlip](https://en.wikipedia.org/wiki/Circlip) — web — CC BY-SA 4.0 (text)
- Wikipedia: [Retaining ring](https://en.wikipedia.org/wiki/Retaining_ring) — web — CC BY-SA 4.0 (text)
- McMaster-Carr: [Shaft collars (free STEP per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/shaft-collars/) — STEP, PDF — McMaster-Carr site terms (verify at link)
- McMaster-Carr: [Retaining rings (free STEP per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/retaining-rings/) — STEP, PDF — McMaster-Carr site terms (verify at link)
- Long Earth Society: [Engine and rig builds](https://longearthsociety.com/engineering/) — web, video — LES site

## Free STEP/STL (7 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/shaft-collars/index.json

- collar-3mm: [STEP](https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-3mm.step) · [STL](https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-3mm.stl) — set-screw shaft collar Ø3 bore, OD 8, 5 wide, M3
- collar-4mm: [STEP](https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-4mm.step) · [STL](https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-4mm.stl) — set-screw shaft collar Ø4 bore, OD 9, 5 wide, M3
- collar-5mm: [STEP](https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-5mm.step) · [STL](https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-5mm.stl) — set-screw shaft collar Ø5 bore, OD 10, 6 wide, M3
- collar-6mm: [STEP](https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-6mm.step) · [STL](https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-6mm.stl) — set-screw shaft collar Ø6 bore, OD 12, 7 wide, M3
- collar-8mm: [STEP](https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-8mm.step) · [STL](https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-8mm.stl) — set-screw shaft collar Ø8 bore, OD 16, 8 wide, M4
- collar-10mm: [STEP](https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-10mm.step) · [STL](https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-10mm.stl) — set-screw shaft collar Ø10 bore, OD 20, 10 wide, M4
- collar-12mm: [STEP](https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-12mm.step) · [STL](https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-12mm.stl) — set-screw shaft collar Ø12 bore, OD 22, 10 wide, M5

## How it fits

### Goes in or on
- [Metric shafts Ø3 to Ø10 with D-flats and clip grooves](https://xemstudio.com/objects/metric-shafts/): bore = shaft Ø, screw on the D-flat

### Connects to
- [Pillow block KP08 envelope with a 608 pocket](https://xemstudio.com/objects/pillow-block-kp08/): one each side of the 608

### Alternatives
- [E-clips DIN 6799 for Ø2 to Ø10 shafts](https://xemstudio.com/objects/e-clips-din-6799/): clip in a groove

### Also needed
- [Set screws (grub screws), M3–M8 (ISO 4026)](https://xemstudio.com/objects/set-screws-metric/): M3 / M4 / M5 set screw

## Questions

**What size shaft collar for an 8 mm shaft?**

Ø8 bore, 16 OD, 8 wide, M4 set screw (Ø3.3 tap-drill hole).

**What size shaft collar for a 5 mm shaft?**

Ø5 bore, 10 OD, 6 wide, M3 set screw (Ø2.5 tap-drill hole).

## Fits with

- [Metric shafts Ø3 to Ø10 with D-flats and clip grooves](https://xemstudio.com/objects/metric-shafts/)
- [Set screws (grub screws), M3–M8 (ISO 4026)](https://xemstudio.com/objects/set-screws-metric/)
- [E-clips DIN 6799 for Ø2 to Ø10 shafts](https://xemstudio.com/objects/e-clips-din-6799/)
- [External circlips DIN 471 for Ø4 to Ø20 shafts](https://xemstudio.com/objects/circlips-din-471/)
- [Pillow block KP08 envelope with a 608 pocket](https://xemstudio.com/objects/pillow-block-kp08/)