# Clevises with M3 tapped shank: Ø3, Ø5 and Ø6 pins, 5 to 12 mm gaps

> What are the dimensions of a small clevis fork for a pushrod?

- Category: Hardware › Motion
- Kind: Hardware
- Basis: Fork with a cross pin hole at the pin Ø and a gap equal to the link thickness; Ø8 shank boss tapped M3 (Ø2.5 tap drill)
- Page: https://xemstudio.com/objects/clevises/ · JSON: https://xemstudio.com/api/geometry?object=clevises · Plain text: https://xemstudio.com/objects/clevises/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 fork 18 long × 12 tall with two 4 mm tines; the gap between the tines is the link thickness and the cross hole is the pin Ø, 6 mm in from the open end at mid-height.
- A Ø8 × 10 shank boss on the closed end carries a Ø2.5 hole 10 deep, the M3 tap drill, for a threaded pushrod. Every file is 28 long overall.
- Sizes: Ø3 pin with a 5 or 8 mm gap; Ø5 pin with 8 or 10; Ø6 pin with 12. Width across the tines is gap + 8 (13, 16, 16, 18, 20).

## 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 |
|---|---|---|---|---|
| pin hole | Ø3 / Ø5 / Ø6 | clevis pin (turns in it) | run | clevis-* |
| fork gap | 5 / 8 / 10 / 12 | link of that thickness | run | clevis-* |
| shank thread hole | Ø2.5 | M3 tap drill (pushrod) | designed | clevis-* |

## Sizes

| file | pin hole Ø | gap | width | length | height | shank |
|---|---|---|---|---|---|---|
| clevis-3-gap5 | 3 | 5 | 13 | 28 | 12 | Ø8, M3 tap Ø2.5 × 10 |
| clevis-3-gap8 | 3 | 8 | 16 | 28 | 12 | Ø8, M3 tap Ø2.5 × 10 |
| clevis-5-gap8 | 5 | 8 | 16 | 28 | 12 | Ø8, M3 tap Ø2.5 × 10 |
| clevis-5-gap10 | 5 | 10 | 18 | 28 | 12 | Ø8, M3 tap Ø2.5 × 10 |
| clevis-6-gap12 | 6 | 12 | 20 | 28 | 12 | Ø8, M3 tap Ø2.5 × 10 |

## Where the files are

- Wikipedia: [Clevis fastener](https://en.wikipedia.org/wiki/Clevis_fastener) — web — CC BY-SA 4.0 (text)
- Wikipedia: [Universal joint](https://en.wikipedia.org/wiki/Universal_joint) — web — CC BY-SA 4.0 (text)
- Wikipedia: [Rod end bearing](https://en.wikipedia.org/wiki/Rod_end_bearing) — web — CC BY-SA 4.0 (text)
- McMaster-Carr: [Clevis pins (free STEP per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/clevis-pins/) — STEP, PDF — McMaster-Carr site terms (verify at link)
- McMaster-Carr: [Rod ends (free STEP per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/ball-joint-rod-ends/) — 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 (5 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/clevises/index.json

- clevis-3-gap5: [STEP](https://xemstudio.com/files/hardware/pins-clevises-and-joints/clevis-3-gap5.step) · [STL](https://xemstudio.com/files/hardware/pins-clevises-and-joints/clevis-3-gap5.stl) — clevis for a Ø3 pin (Ø3 hole), 5 mm gap for a 5 mm link, M3 tapped shank (Ø2.5)
- clevis-3-gap8: [STEP](https://xemstudio.com/files/hardware/pins-clevises-and-joints/clevis-3-gap8.step) · [STL](https://xemstudio.com/files/hardware/pins-clevises-and-joints/clevis-3-gap8.stl) — clevis for a Ø3 pin (Ø3 hole), 8 mm gap for a 8 mm link, M3 tapped shank (Ø2.5)
- clevis-5-gap8: [STEP](https://xemstudio.com/files/hardware/pins-clevises-and-joints/clevis-5-gap8.step) · [STL](https://xemstudio.com/files/hardware/pins-clevises-and-joints/clevis-5-gap8.stl) — clevis for a Ø5 pin (Ø5 hole), 8 mm gap for a 8 mm link, M3 tapped shank (Ø2.5)
- clevis-5-gap10: [STEP](https://xemstudio.com/files/hardware/pins-clevises-and-joints/clevis-5-gap10.step) · [STL](https://xemstudio.com/files/hardware/pins-clevises-and-joints/clevis-5-gap10.stl) — clevis for a Ø5 pin (Ø5 hole), 10 mm gap for a 10 mm link, M3 tapped shank (Ø2.5)
- clevis-6-gap12: [STEP](https://xemstudio.com/files/hardware/pins-clevises-and-joints/clevis-6-gap12.step) · [STL](https://xemstudio.com/files/hardware/pins-clevises-and-joints/clevis-6-gap12.stl) — clevis for a Ø6 pin (Ø6 hole), 12 mm gap for a 12 mm link, M3 tapped shank (Ø2.5)

## How it fits

### Connects to
- [Clevis pins ISO 2341 B, Ø3 to Ø8](https://xemstudio.com/objects/clevis-pins/): Ø3 / Ø5 / Ø6 pin across the fork
- [Four-bar links: flat links with 20 to 100 mm hole centres](https://xemstudio.com/objects/four-bar-links/): link of the gap's thickness between the tines

### Alternatives
- [Rod ends (heim joints) M3 to M8](https://xemstudio.com/objects/rod-ends-heim-joints/): ball joint on a threaded shank

### Also needed
- [R-clips (hairpin cotters) for Ø2 to Ø6 pins](https://xemstudio.com/objects/r-clips/): retains the pin

## Questions

**What clevis fits a 5 mm thick link?**

clevis-3-gap5: 5 mm gap, Ø3 pin hole, 13 × 28 × 12 overall.

**What thread is the clevis shank?**

M3: a Ø2.5 tap-drill hole 10 deep in a Ø8 boss.

## Fits with

- [Clevis pins ISO 2341 B, Ø3 to Ø8](https://xemstudio.com/objects/clevis-pins/)
- [R-clips (hairpin cotters) for Ø2 to Ø6 pins](https://xemstudio.com/objects/r-clips/)
- [Rod ends (heim joints) M3 to M8](https://xemstudio.com/objects/rod-ends-heim-joints/)
- [Four-bar links: flat links with 20 to 100 mm hole centres](https://xemstudio.com/objects/four-bar-links/)
- [Bell cranks: 30 × 30 and 20 × 40 mm arms at 90°](https://xemstudio.com/objects/bell-cranks/)