# Bearing pocket gauge for 623, 625 and 608 (Ø10 / Ø16 / Ø22, +0 / +0.2 / +0.4)

> How tight should a 3D printed 608 bearing pocket be?

- Category: Stirling engines › Generators & instruments
- Kind: Hardware
- Basis: Pockets at the bearing OD (623 Ø10, 625 Ø16, 608 Ø22) and +0.2 / +0.4, 6 deep
- Page: https://xemstudio.com/objects/bearing-pocket-gauge/ · JSON: https://xemstudio.com/api/geometry?object=bearing-pocket-gauge · Plain text: https://xemstudio.com/objects/bearing-pocket-gauge/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

- Every file on this site is drawn at exact size with no printing allowance; this gauge steps through sizes around the nominal so you can measure the allowance your process needs for one fit class, then apply it only to the features each object lists under Mating features.
- The gauge is a 100 × 36 × 8 mm block with nine pockets 6 mm deep: Ø10.0, 10.2, 10.4 (623), Ø16.0, 16.2, 16.4 (625), Ø22.0, 22.2, 22.4 (608).
- Press each bearing in with a thumb: the pocket that holds it, minus the bearing OD, is your bearing-pocket allowance.
- The three Ø22 pockets run out through the long edge of the block (they are 0.2–3.2 mm wider than the edge allows), which does not affect reading the bore.

## 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 |
|---|---|---|---|---|
| gauge sizes | stepped around nominal | the true pin, nut, bearing or extrusion slot being tested | designed | all |

## Sizes

| bearing | od_mm | pockets_mm | depth_mm |
|---|---|---|---|
| 623 | 10 | 10.0 / 10.2 / 10.4 | 6 |
| 625 | 16 | 16.0 / 16.2 / 16.4 | 6 |
| 608 | 22 | 22.0 / 22.2 / 22.4 | 6 |

## Where the files are

- Wikipedia: [Engineering tolerance](https://en.wikipedia.org/wiki/Engineering_tolerance) — web — CC BY-SA 4.0 (text)
- Prusa: [Knowledge base: XY size compensation](https://help.prusa3d.com/article/xy-size-compensation_125045) — web — Prusa KB (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/bearing-pocket-gauge/index.json

- bearing-pocket-gauge-623-625-608: [STEP](https://xemstudio.com/files/hardware/printer-calibration-coupons/bearing-pocket-gauge-623-625-608.step) · [STL](https://xemstudio.com/files/hardware/printer-calibration-coupons/bearing-pocket-gauge-623-625-608.stl) — bearing pocket gauge, 100 × 48 × 8 block: Ø10.0/10.2/10.4 (623) and Ø16.0/16.2/16.4 (625) in the top row, Ø22.0/22.2/22.4 (608) in the bottom row, 6 deep, every pocket separate with at least 2.9 mm of wall to its neighbours and the block edges

## How it fits

### Connects to
- [608 ball bearing](https://xemstudio.com/objects/608-bearing/): Ø22 OD into the 22.x pockets
- [Ball bearings, 683 to 6210 and flanged F6xx (ISO 15)](https://xemstudio.com/objects/ball-bearings-metric/): 623 Ø10 and 625 Ø16 into their pockets

### Also needed
- [Printed pin gauges 2.8–3.2 and 4.8–5.2 mm](https://xemstudio.com/objects/pin-gauges/): the bore side of the same bearings

## Questions

**What size pocket for a 608 bearing?**

The bearing is Ø22; the pocket is drawn at Ø22.000 and this gauge shows how much your process needs on top.

**Which bearings does the gauge cover?**

623 (Ø10), 625 (Ø16) and 608 (Ø22).

## Fits with

- [608 ball bearing](https://xemstudio.com/objects/608-bearing/)
- [Ball bearings, 683 to 6210 and flanged F6xx (ISO 15)](https://xemstudio.com/objects/ball-bearings-metric/)
- [Hole gauges for Ø3, Ø5 and Ø8 (0.1 mm steps)](https://xemstudio.com/objects/hole-gauges/)
- [Printed pin gauges 2.8–3.2 and 4.8–5.2 mm](https://xemstudio.com/objects/pin-gauges/)