# Ceramic standoff Ø10 × 20 mm, Ø4.3 hole (M4)

> What size ceramic standoff for M4 screws?

- Category: Stirling engines › Heat & regenerator
- Kind: Hardware
- Basis: Standoff Ø10 × 20 with an ISO 273 fine M4 clearance hole (Ø4.3)
- Page: https://xemstudio.com/objects/ceramic-standoff/ · JSON: https://xemstudio.com/api/geometry?object=ceramic-standoff · Plain text: https://xemstudio.com/objects/ceramic-standoff/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

- The file is a Ø10 × 20 mm cylinder with a Ø4.3 through hole, the ISO 273 fine clearance for an M4 screw.
- Standoffs of this kind come in Ø6–12 × 10–30 mm.
- They space the hot end off a frame so heat does not conduct into it; I use two on the cold-side mounts.

## 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 |
|---|---|---|---|---|
| standoff hole | Ø4.3 | M4 screw clearance (ISO 273 fine) | designed | ceramic-standoff-* |

## Sizes

| standoff | od_mm | length_mm | hole_mm | screw |
|---|---|---|---|---|
| ceramic-standoff-10x20 | 10 | 20 | 4.3 | M4 |

## Where the files are

- Wikipedia: [Mesh (scale)](https://en.wikipedia.org/wiki/Mesh_(scale)) — web — CC BY-SA 4.0 (text)
- Wikipedia: [Regenerative heat exchanger](https://en.wikipedia.org/wiki/Regenerative_heat_exchanger) — web — CC BY-SA 4.0 (text)
- Wikipedia: [Steel wool](https://en.wikipedia.org/wiki/Steel_wool) — web — CC BY-SA 4.0 (text)
- McMaster-Carr: [Wire cloth (free STEP per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/wire-cloth/) — 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 (1 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/ceramic-standoff/index.json

- ceramic-standoff-10x20: [STEP](https://xemstudio.com/files/hardware/regenerator-and-heat-materials/ceramic-standoff-10x20.step) · [STL](https://xemstudio.com/files/hardware/regenerator-and-heat-materials/ceramic-standoff-10x20.stl) — ceramic / steatite standoff Ø10 × 20, Ø4.3 hole (M4 clearance, ISO 273 fine)

## How it fits

### Connects to
- [Socket head cap screws, M2–M8 (ISO 4762 / DIN 912)](https://xemstudio.com/objects/socket-head-cap-screws-metric/): M4 screw through the Ø4.3 hole

### Alternatives
- [Threaded standoffs, M2.5 and M3 (hex and round)](https://xemstudio.com/objects/threaded-standoffs-metric/): metal standoffs where heat is not a concern

### Also needed
- [Insulating firebrick 230 × 114 × 64 mm (9 × 4.5 × 2.5 in)](https://xemstudio.com/objects/insulating-firebrick/): base under the burner

## Questions

**What hole size for an M4 ceramic standoff?**

Ø4.3, the ISO 273 fine clearance; the standoff is Ø10 × 20 mm.

**What sizes do high-temperature standoffs come in?**

Ø6–12 mm by 10–30 mm long; this file is Ø10 × 20.

## Fits with

- [Insulating firebrick 230 × 114 × 64 mm (9 × 4.5 × 2.5 in)](https://xemstudio.com/objects/insulating-firebrick/)
- [Socket head cap screws, M2–M8 (ISO 4762 / DIN 912)](https://xemstudio.com/objects/socket-head-cap-screws-metric/)
- [Threaded standoffs, M2.5 and M3 (hex and round)](https://xemstudio.com/objects/threaded-standoffs-metric/)
- [Tri-clamp (Tri-Clover) sanitary ferrule, 1/2 to 4 inch](https://xemstudio.com/objects/tri-clamp-ferrule/)