# Rotary shaft lip seal 8 × 22 × 7 (envelope)

> What size shaft seal fits an 8 mm shaft in a 22 mm bore?

- Category: Hardware › Stirling & thermoacoustic
- Kind: Standard part
- Basis: ISO 6194-1 nominal size 8 × 22 × 7; drawn as an envelope (case, lip bore, recess)
- Page: https://xemstudio.com/objects/rotary-shaft-seal-8x22x7/ · JSON: https://xemstudio.com/api/geometry?object=rotary-shaft-seal-8x22x7 · Plain text: https://xemstudio.com/objects/rotary-shaft-seal-8x22x7/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

**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 bought seal drawn as the space it takes: Ø22 × 7 case, the lip on the Ø8 shaft. The same bore as a 608 bearing, so one Ø22 bore takes both.

## 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 |
|---|---|---|---|---|
| case OD | Ø22 × 7 | cap bore Ø22 | press | all |
| lip | Ø8 | Ø8 crank shaft | run | all |

## Sizes

| d | D | b |
|---|---|---|
| 8 | 22 | 7 |

## Where the files are

- ISO: [ISO 6194-1 Rotary shaft lip-type seals: nominal dimensions (8 × 22 × 7 is a listed size)](https://www.iso.org/standard/41300.html) — standard — dimensions are facts (verify at link)
- Long Earth Society: [Engine 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/rotary-shaft-seal-8x22x7/index.json

- shaft-seal-8x22x7: [STEP](https://xemstudio.com/files/hardware/rotary-shaft-seal-8x22x7/shaft-seal-8x22x7.step) · [STL](https://xemstudio.com/files/hardware/rotary-shaft-seal-8x22x7/shaft-seal-8x22x7.stl) — rotary shaft seal 8 × 22 × 7 envelope: case Ø22 × 7, lip bore Ø8, Ø16 × 4 recess on the air side

## Questions

**Which way round?**

Lip toward the pressure: the case's plain face toward the crankcase.

## Fits with

- [3 in end caps with a bored 608 bearing boss: shaft-seal version and blind version with three 1/4 NPT bosses](https://xemstudio.com/objects/tri-clamp-bearing-cap-3in/)
- [Build list: Tri-clamp charged beta, 2 in](https://xemstudio.com/objects/list-tri-clamp-charged-beta/)