# Gravity roller conveyor on 15-series side frames: 1.9 in rollers, 7/16 hex axles, 3 in pitch

> How do I build a roller conveyor from T-slot extrusion?

- Category: Hardware › Framing
- Kind: Hardware
- Basis: Xem Studio design: Ø1.9 in rollers on 7/16 in hex axles (the common gravity-conveyor sizes) between two 1515 side frames, holes at a 3 in pitch on the rail centre line; legs from 1515 set the roller-top height
- Page: https://xemstudio.com/objects/t-slot-gravity-roller-conveyor/ · JSON: https://xemstudio.com/api/geometry?object=t-slot-gravity-roller-conveyor · Plain text: https://xemstudio.com/objects/t-slot-gravity-roller-conveyor/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.** True size, with no printing tolerance added.

## Notes

- Roller top = side-frame centre line + 0.95 in. Set leg length so that sits at your bench height.

## Sizes

| between_frames_in | roller_in | axle_hex_in | pitch_in |
|---|---|---|---|
| 18 | 1.9 | 0.4375 | 3 |
| 24 | 1.9 | 0.4375 | 3 |
| 30 | 1.9 | 0.4375 | 3 |

## Where the files are

- 80/20: [15 series T-slot profiles and fasteners (1.5 in rail, 5/16-18 hardware)](https://8020.net/1515.html) — web — maker's catalogue; numbers cited

## Free STEP/STL (10 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/t-slot-gravity-roller-conveyor/index.json

- roller-1.9in-for-18in: [STEP](https://xemstudio.com/files/hardware/t-slot-gravity-roller-conveyor/roller-1.9in-for-18in.step) · [STL](https://xemstudio.com/files/hardware/t-slot-gravity-roller-conveyor/roller-1.9in-for-18in.stl) — Ø1.9 in roller, 18 in between frames, 1.65 wall, 7/16 hex bore
- hex-axle-7-16in-for-18in: [STEP](https://xemstudio.com/files/hardware/t-slot-gravity-roller-conveyor/hex-axle-7-16in-for-18in.step) · [STL](https://xemstudio.com/files/hardware/t-slot-gravity-roller-conveyor/hex-axle-7-16in-for-18in.stl) — 7/16 in hex axle, 21 in (through both 1515 side frames)
- roller-1.9in-for-24in: [STEP](https://xemstudio.com/files/hardware/t-slot-gravity-roller-conveyor/roller-1.9in-for-24in.step) · [STL](https://xemstudio.com/files/hardware/t-slot-gravity-roller-conveyor/roller-1.9in-for-24in.stl) — Ø1.9 in roller, 24 in between frames, 1.65 wall, 7/16 hex bore
- hex-axle-7-16in-for-24in: [STEP](https://xemstudio.com/files/hardware/t-slot-gravity-roller-conveyor/hex-axle-7-16in-for-24in.step) · [STL](https://xemstudio.com/files/hardware/t-slot-gravity-roller-conveyor/hex-axle-7-16in-for-24in.stl) — 7/16 in hex axle, 27 in (through both 1515 side frames)
- roller-1.9in-for-30in: [STEP](https://xemstudio.com/files/hardware/t-slot-gravity-roller-conveyor/roller-1.9in-for-30in.step) · [STL](https://xemstudio.com/files/hardware/t-slot-gravity-roller-conveyor/roller-1.9in-for-30in.stl) — Ø1.9 in roller, 30 in between frames, 1.65 wall, 7/16 hex bore
- hex-axle-7-16in-for-30in: [STEP](https://xemstudio.com/files/hardware/t-slot-gravity-roller-conveyor/hex-axle-7-16in-for-30in.step) · [STL](https://xemstudio.com/files/hardware/t-slot-gravity-roller-conveyor/hex-axle-7-16in-for-30in.stl) — 7/16 in hex axle, 33 in (through both 1515 side frames)
- side-frame-drill-plate-24in: [STEP](https://xemstudio.com/files/hardware/t-slot-gravity-roller-conveyor/side-frame-drill-plate-24in.step) · [STL](https://xemstudio.com/files/hardware/t-slot-gravity-roller-conveyor/side-frame-drill-plate-24in.stl) — drill plate for a 24 in 1515 side frame: 8 hex holes at 3 in pitch on the centre line
- side-frame-drill-plate-36in: [STEP](https://xemstudio.com/files/hardware/t-slot-gravity-roller-conveyor/side-frame-drill-plate-36in.step) · [STL](https://xemstudio.com/files/hardware/t-slot-gravity-roller-conveyor/side-frame-drill-plate-36in.stl) — drill plate for a 36 in 1515 side frame: 12 hex holes at 3 in pitch on the centre line
- side-frame-drill-plate-48in: [STEP](https://xemstudio.com/files/hardware/t-slot-gravity-roller-conveyor/side-frame-drill-plate-48in.step) · [STL](https://xemstudio.com/files/hardware/t-slot-gravity-roller-conveyor/side-frame-drill-plate-48in.stl) — drill plate for a 48 in 1515 side frame: 16 hex holes at 3 in pitch on the centre line
- side-frame-drill-plate-60in: [STEP](https://xemstudio.com/files/hardware/t-slot-gravity-roller-conveyor/side-frame-drill-plate-60in.step) · [STL](https://xemstudio.com/files/hardware/t-slot-gravity-roller-conveyor/side-frame-drill-plate-60in.stl) — drill plate for a 60 in 1515 side frame: 20 hex holes at 3 in pitch on the centre line

## Questions

**Roller top height?**

Side-frame centre line + 0.95 in.

## Fits with

- [1515 T-slot extrusion, 1.5 × 1.5 in (15-series inch)](https://xemstudio.com/objects/1515-t-slot-extrusion-inch/)
- [Slide-in T-nuts for 20, 30, 40, 45 mm and 1 in, 1.5 in T-slot extrusion](https://xemstudio.com/objects/slide-in-t-nuts/)
- [Socket head cap screws, inch: #10-24, #10-32, 5/16-18, 3/8-16, 1/2-13 (ASME B18.3)](https://xemstudio.com/objects/socket-head-cap-screws-inch/)
- [Button head socket cap screws, inch: #4-40 to 1/2-13 (ASME B18.3)](https://xemstudio.com/objects/button-head-socket-screws-inch/)
- [L corner brackets for 20, 30, 40, 45 mm and 1 in, 1.5 in T-slot extrusion](https://xemstudio.com/objects/t-slot-corner-brackets/)