# V-Slot wheels and eccentric spacers: Delrin mini, Delrin and solid V wheels, 625 and 105ZZ bearings, 7.12 mm spacer hole

> What are the OD, width, bore and bearing of OpenBuilds-style V-Slot wheels, and what hole does an eccentric spacer need?

- Category: Hardware › Bearings, rails & motion
- Kind: Standard part
- Basis: OpenBuilds Part Store kit pages (mini, Delrin), retailer kit pages (Rat Rig, MakerTechStore, Reach.dog, Grobotronics) and OpenBuilds' bearing page; numbers only. The wheel groove angle and depth are not published in any page read, so no wheel is drawn
- Page: https://xemstudio.com/objects/v-slot-wheels-eccentric-spacers/ · JSON: https://xemstudio.com/api/geometry?object=v-slot-wheels-eccentric-spacers · Plain text: https://xemstudio.com/objects/v-slot-wheels-eccentric-spacers/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

**Exact dimensions.** True size, with no tolerance added.

## Notes

- Rows give outside diameter, thickness ('Thick' on the kit page), the wheel's bore (the seat that holds the two bearings, with the printed tolerance), the bearings and shims in the kit, and the material. The Delrin Mini wheel is 15.23 x 8.8 mm with a 9.974 ± 0.026 mm bore (it holds a Ø10 bearing); the Delrin V wheel is 23.90 x 10.23 mm with a 15.974 ± 0.026 mm bore (it holds two Ø16 625 bearings). OpenBuilds prints 23.90 mm for the V wheel; the page bearing-housings-and-rod-supports prints 23.89, so both are shown.
- The mini kit page does not name its bearing; OpenBuilds sells a 105ZZ 5 x 10 x 4 mm mini bearing (OD 10, ID 5, 4 thick, 168 N dynamic, 430 N static load rating), but its compatibility field is blank, so it is listed as a sold part, not as the kit's bearing. Rat Rig's mini kit adds 'M5 lock nut and M5 x 25 mm low-profile screw' and a 1/4 in aluminium spacer; MakerTechStore's page prints the same three wheel numbers for the Delrin and the Xtreme mini.
- Eccentric spacers: OpenBuilds prints a 5 mm bore, a rim that 'fits into a 7.12 mm hole', a 6 mm (or 1/4 in) cam height and up to 1.5 mm of off-centre adjustment; the Grobotronics mini spacer prints a 6 mm height, a 5 mm bore, a 7.12 mm hole and 'approx 0.79 mm' of adjustment, and mentions a 10 mm flange. The spacer's outside diameter, hex size and thread are not printed by any page read. The 7.12 mm hole agrees with the Ø7.1 on bearing-housings-and-rod-supports.
- Not here: the V angle and groove depth of the wheels (no page read prints them), the solid wheel's OD and width (the Solid V kit page read does not print them), and bearing models for the mini wheel. McMaster-Carr has no V-Slot wheels; its T-slotted framing category is linked as the nearest family.

## Sizes

| part | OD (mm) | width / height (mm) | bore (mm) | bearing | shims / adjustment | material |
|---|---|---|---|---|---|---|
| Delrin Mini V wheel (OpenBuilds kit 495) | 15.23 | 8.8 | 9.974 ± 0.026 | 2 mini ball bearings (model not printed on the kit page); OpenBuilds sells a 105ZZ 5 x 10 x 4 separately | 2 precision shims (Rat Rig: 1 mm each) | Delrin, M80, 63 MPa |
| Xtreme Mini V wheel | 15.23 | 8.8 | 9.974 ± 0.026 | not printed | not printed | polycarbonate (clear), M75, 86 MPa |
| Delrin V wheel (OpenBuilds kit 500) | 23.90 (OpenBuilds page); 23.89 on bearing-housings-and-rod-supports | 10.23 | 15.974 ± 0.026 | 2 x 625 2RS (bearing ID 5 mm) | 2 x 5 mm precision shim | Delrin, M80, 63 MPa |
| Solid V wheel (OpenBuilds kit 480) | not printed | not printed | not printed | 2 x 625 2RS | 2 x 5 mm precision shim | not printed |
| — eccentric spacer, standard (OpenBuilds V7) | — | cam height 6 mm or 1/4 in | bore 5 mm; rim fits a 7.12 mm hole | — | up to 1.5 mm off-centre | stainless steel |
| — eccentric spacer, mini (Grobotronics) | 10 mm flange as printed (not labelled as OD) | height 6 mm | bore 5 mm; fits a 7.12 mm hole | — | about 0.79 mm adjustment range | — |
| — bearing 105ZZ (OpenBuilds) | 10 | 4 | ID 5 | Cr 168 N, Cor 430 N | sealed, shielded | chrome steel |

## Where the files are

- OpenBuilds Part Store: [Delrin Mini V Wheel Kit: OD 15.23 mm, thick 8.8 mm, ID 9.974 ± 0.026 mm, M80, 63 MPa; kit has 2 mini ball bearings, 2 precision shims, lock nut](https://openbuildspartstore.com/delrin-mini-v-wheel-kit/) — web — Maker page; numbers only
- OpenBuilds Part Store: [Delrin V Wheel Kit: OD 23.90 mm, thick 10.23 mm, ID 15.974 ± 0.026 mm, 2 x 625 2RS (bearing ID 5 mm), 2 x 5 mm precision shim](https://openbuildspartstore.com/delrin-v-wheel-kit/) — web — Maker page; numbers only
- OpenBuilds Part Store: [Eccentric Spacer (V7): 6 mm or 1/4 in cam height, 5 mm bore, rim fits a 7.12 mm hole, up to 1.5 mm off-centre adjustment](https://openbuildspartstore.com/eccentric-spacer/) — web — Maker page; numbers only
- OpenBuilds: [Mini Ball Bearing 105ZZ 5x10x4: OD 10, ID 5, thickness 4 mm, Cr 168 N, Cor 430 N](https://us.openbuilds.com/mini-ball-bearing-105zz-5x10x4) — web — Maker page; numbers only
- Rat Rig: [Mini V Wheel Kit: OD 15.23, thick 8.8, bore 9.974 ± 0.026; 2 mini V bearings, 2 x 1 mm shims, M5 lock nut, M5 x 25 mm screw](https://ratrig.com/products/mini-v-wheel-kit) — web — Retailer page; numbers only
- MakerTechStore: [Mini Solid V Wheel kits: Delrin (black, M80, 63 MPa) and Xtreme polycarbonate (clear, M75, 86 MPa), both OD 15.23, thick 8.8, ID 9.974 ± 0.026](https://makertechstore.com/products/mini-v-wheel-kits) — web — Retailer page; numbers only
- Grobotronics: [OpenBuilds Eccentric Spacer Mini: height 6 mm, bore 5 mm, fits a 7.12 mm hole, about 0.79 mm adjustment range, 10 mm flange](https://grobotronics.com/eccentric-spacer-mini.html) — web — Retailer page; numbers only
- Reach.dog (MakerParts US): [Solid V Wheel Kit: 2 x 625 2RS bearings, 2 x 5 mm precision shim, nylon lock nut (no wheel OD or width printed)](https://reach.dog/shop/makerparts-us/products/solid-v-wheel-kit) — web — Retailer page; numbers only
- McMaster-Carr: [T-slotted framing (McMaster lists no V-Slot profile or V-wheel; this is the nearest family) (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/t-slotted-framing/) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)

## Questions

**What is the OD of an OpenBuilds Mini V wheel?**

15.23 mm, 8.8 mm thick, with a 9.974 ± 0.026 mm bore.

**What bearing does the Delrin V wheel use?**

Two 625 2RS bearings (5 mm bore), with two 5 mm precision shims, per OpenBuilds.

**What hole does an eccentric spacer fit?**

A 7.12 mm hole, 5 mm bore, 6 mm cam height (OpenBuilds); up to 1.5 mm off-centre adjustment.

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