# Bicycle bottle-cage bosses: M5 × 0.8 on 64 mm

> What is the bottle cage bolt spacing on a bike?

- Category: Everyday mounts › Bicycle
- Kind: Standard part
- Basis: Wikipedia, Bottle cage: two holes 64 mm (2 1/2 in) apart, threaded for M5 × 0.8; a standard cage holds a 73 mm bottle
- Page: https://xemstudio.com/objects/bicycle-bottle-cage-bosses/ · JSON: https://xemstudio.com/api/geometry?object=bicycle-bottle-cage-bosses · Plain text: https://xemstudio.com/objects/bicycle-bottle-cage-bosses/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

- Frames carry pairs of threaded bosses (or rivet nuts) for a bottle cage: M5 × 0.8, 64 mm between centres. The same pair is used for pumps, tool kits, accessory cages and many mounts.
- The 64 mm is the published metric figure; 2 1/2 in is 63.5 mm. Slotted cage holes take up the difference; for a part with round holes, check the frame.
- Files: the pattern as a DXF (two Ø5 circles, the M5 major diameter, 64.0 apart) and a template strip 80 × 12 × 3 (my size) with Ø5.5 holes, the ISO 273 medium clearance for M5.
- A standard cage holds a Ø73 mm bottle.

## 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 |
|---|---|---|---|---|
| holes | Ø5.5 on 64.0 | M5 × 0.8 screws into the frame bosses (ISO 273 medium clearance) | designed | bottle-boss-* |

## Sizes

| feature | mm | from |
|---|---|---|
| boss spacing | 64 (2 1/2 in) | Wikipedia, Bottle cage |
| thread | M5 × 0.8 | Wikipedia, Bottle cage |
| bottle a standard cage holds | Ø73 | Wikipedia, Bottle cage |
| clearance hole drawn | Ø5.5 (M5 medium, ISO 273) | ISO 273 |

## Where the files are

- Wikipedia: [Bottle cage: two M5 × 0.8 holes 64 mm apart; standard cage holds a 73 mm bottle](https://en.wikipedia.org/wiki/Bottle_cage) — web — CC BY-SA 4.0 (text) (verify at link)

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

Index: https://xemstudio.com/files/hardware/bicycle-bottle-cage-bosses/index.json

- bottle-boss-pattern-64-m5: [STEP](https://xemstudio.com/files/hardware/bicycle-bottle-cage-bosses/bottle-boss-pattern-64-m5.step) · [STL](https://xemstudio.com/files/hardware/bicycle-bottle-cage-bosses/bottle-boss-pattern-64-m5.stl) · [DXF](https://xemstudio.com/files/hardware/bicycle-bottle-cage-bosses/bottle-boss-pattern-64-m5.dxf) — Bottle-cage boss pattern: two holes 64.0 apart, Ø5.5 (M5 medium clearance, ISO 273) in an 80 × 12 × 3 round-ended template strip (the strip size is mine); DXF = two Ø5 circles (M5 major) 64.0 apart

## How it fits

### Connects to
- [Socket head cap screws, M2–M8 (ISO 4762 / DIN 912)](https://xemstudio.com/objects/socket-head-cap-screws-metric/): two M5 × 0.8 screws into the bosses

### Alternatives
- [Handlebar clamp rings: split rings for 22.2 to 35.0 mm bars, M4 / M5](https://xemstudio.com/objects/handlebar-clamp-rings/): a clamp on the bar or post where there are no bosses

## Questions

**What is the bottle cage bolt spacing?**

64 mm between centres (2 1/2 in), M5 × 0.8 screws.

**What size screws hold a bottle cage?**

M5 × 0.8, usually 10–12 mm long, into the frame's bosses.

**What diameter bottle does a cage hold?**

73 mm on a standard cage.

## Fits with

- [Bicycle handlebar diameters: 22.2, 23.8, 25.4, 26.0, 31.8 and 35.0 mm](https://xemstudio.com/objects/bicycle-handlebar-diameters/)
- [Bicycle seatpost diameters: 25.4, 26.8, 27.2, 28.6, 30.9, 31.6 and 34.9 mm](https://xemstudio.com/objects/bicycle-seatpost-diameters/)
- [Socket head cap screws, M2–M8 (ISO 4762 / DIN 912)](https://xemstudio.com/objects/socket-head-cap-screws-metric/)