# Linear rod Ø8 × 300

> What size rod does an LM8UU run on?

- Category: Hardware › Motion
- Kind: Hardware
- Basis: Plain round Ø8 rod at the LM8UU bore
- Page: https://xemstudio.com/objects/linear-rod-8mm/ · JSON: https://xemstudio.com/api/geometry?object=linear-rod-8mm · Plain text: https://xemstudio.com/objects/linear-rod-8mm/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 plain Ø8 rod, 300 long, square ends.
- It carries LM8UU bearings and is held at the ends by SK8 supports.
- For Ø8 shafts with D-flats or clip grooves see the metric shafts page.

## 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 | Ø8 | LM8UU and 8 mm bores | slide | rod-8x300* |

## Sizes

| file | Ø | length |
|---|---|---|
| rod-8x300 | 8 | 300 |

## Where the files are

- McMaster-Carr: [Linear ball bearings (free STEP/IGES/STL per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/linear-bearings/) — STEP, IGES, STL, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)
- Wikipedia: [Linear-motion bearing](https://en.wikipedia.org/wiki/Linear-motion_bearing) — web — CC BY-SA 4.0 (text)

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

Index: https://xemstudio.com/files/hardware/linear-rod-8mm/index.json

- rod-8x300: [STEP](https://xemstudio.com/files/hardware/lm8uu-linear-bearing/rod-8x300.step) · [STL](https://xemstudio.com/files/hardware/lm8uu-linear-bearing/rod-8x300.stl) — 8 mm rod, 300 mm

## How it fits

### Parts that fit it
- [SC8UU slide block for an LM8UU](https://xemstudio.com/objects/slide-block-sc8uu/): rides the Ø8 rod

### Goes in or on
- [SK8 rod support for Ø8 rods](https://xemstudio.com/objects/rod-support-sk8/): clamped at each end

### Connects to
- [LM8UU linear bearing Ø8 × Ø15 × 24](https://xemstudio.com/objects/lm8uu-bearing/): LM8UU slides on it

### Alternatives
- [Metric shafts Ø3 to Ø10 with D-flats and clip grooves](https://xemstudio.com/objects/metric-shafts/): Ø8 shafts with flats and grooves

## Questions

**What rod fits an LM8UU?**

Ø8; this file is Ø8 × 300.

**What holds the rod ends?**

SK8 supports: Ø8 split clamp 20 mm above the base.

## Fits with

- [LM8UU linear bearing Ø8 × Ø15 × 24](https://xemstudio.com/objects/lm8uu-bearing/)
- [SK8 rod support for Ø8 rods](https://xemstudio.com/objects/rod-support-sk8/)
- [Metric shafts Ø3 to Ø10 with D-flats and clip grooves](https://xemstudio.com/objects/metric-shafts/)
- [SC8UU slide block for an LM8UU](https://xemstudio.com/objects/slide-block-sc8uu/)