# SK8 rod support for Ø8 rods

> What are the dimensions of an SK8 shaft support?

- Category: Hardware › Motion
- Kind: Hardware
- Basis: SK8 catalogue dimensions: 42 × 14 base, Ø8 rod at 20 mm, M5 base holes 32 apart, M4 pinch screw
- Page: https://xemstudio.com/objects/rod-support-sk8/ · JSON: https://xemstudio.com/api/geometry?object=rod-support-sk8 · Plain text: https://xemstudio.com/objects/rod-support-sk8/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 42 × 14 block, 32 tall in the middle and 27 at the two stepped ends, with a Ø8 bore across the 14 mm thickness 20 mm above the base.
- A 1.5 mm slot runs from the bore up through the top; an M4 pinch screw closes it on the rod: Ø4.5 clearance on one side of the slot, Ø3.3 tap drill on the other, 28 mm above the base.
- Two Ø5.5 holes (M5 clearance) through the stepped ends, 32 mm apart.

## 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 |
|---|---|---|---|---|
| rod clamp bore | Ø8 | Ø8 rod; the 1.5 split closes on it | clamp | rod-support-* |
| pinch screw holes | Ø4.5 / Ø3.3 | M4 clearance / M4 tap drill | designed | rod-support-* |
| base holes | Ø5.5 | M5 screw clearance | designed | rod-support-* |

## Sizes

| feature | value_mm |
|---|---|
| base | 42 × 14 |
| height | 32 (27 at the ends) |
| rod bore | Ø8 at 20 |
| clamp slot | 1.5 |
| pinch screw | M4: Ø4.5 / Ø3.3 at 28 |
| base holes | 2 × Ø5.5 at 32 |

## Where the files are

- McMaster-Carr: [Mounted bearings (free STEP per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/mounted-ball-bearings/) — STEP, PDF — McMaster-Carr site terms (verify at link)
- McMaster-Carr: [Sleeve bearings (free STEP per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/sleeve-bearings/) — STEP, PDF — McMaster-Carr site terms (verify at link)
- OpenBuilds: [Solid V wheel kit](https://openbuildspartstore.com/solid-v-wheel-kit/) — web, STEP — OpenBuilds site (verify at link)
- Wikipedia: [Plain bearing](https://en.wikipedia.org/wiki/Plain_bearing) — web — CC BY-SA 4.0 (text)
- Long Earth Society: [Engine and rig builds](https://longearthsociety.com/engineering/) — web, video — LES site

## Free STEP/STL (1 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/rod-support-sk8/index.json

- rod-support-sk8: [STEP](https://xemstudio.com/files/hardware/bearing-housings-and-rod-supports/rod-support-sk8.step) · [STL](https://xemstudio.com/files/hardware/bearing-housings-and-rod-supports/rod-support-sk8.stl) — SK8 rod support: Ø8 split clamp, 20 mm centre height, two Ø5.5 (M5 clearance) base holes 32 mm apart, M4 pinch (Ø4.5 clearance / Ø3.3 tap drill)

## How it fits

### Connects to
- [Linear rod Ø8 × 300](https://xemstudio.com/objects/linear-rod-8mm/): Ø8 rod clamped in the bore
- [SC8UU slide block for an LM8UU](https://xemstudio.com/objects/slide-block-sc8uu/): carriage on the same rod

### Also needed
- [LM8UU linear bearing Ø8 × Ø15 × 24](https://xemstudio.com/objects/lm8uu-bearing/): rides on the rod between two supports

## Questions

**What are SK8 dimensions?**

42 × 14 base, 32 tall, Ø8 rod 20 mm above the base, two M5 holes 32 mm apart, M4 pinch screw.

**How does an SK8 hold the rod?**

A 1.5 mm slot from the bore to the top; the M4 screw across it closes the bore on the Ø8 rod.

## Fits with

- [Linear rod Ø8 × 300](https://xemstudio.com/objects/linear-rod-8mm/)
- [LM8UU linear bearing Ø8 × Ø15 × 24](https://xemstudio.com/objects/lm8uu-bearing/)
- [SC8UU slide block for an LM8UU](https://xemstudio.com/objects/slide-block-sc8uu/)
- [Pillow block KP08 envelope with a 608 pocket](https://xemstudio.com/objects/pillow-block-kp08/)