# Ball transfer units: Alwayse Euro units 515 / 522 / 530 / 545 and 3000 flange unit, Omnitrack series: ball size, body, height, seating hole, fixing

> What are the dimensions of a ball transfer unit (ball roller): ball diameter, body diameter, height, seating hole or flange hole spacing, and stud thread?

- Category: Hardware › Bearings, rails & motion
- Kind: Standard part
- Basis: Alwayse's catalogue and maker data pages (tuli-shop, RS), Omnitrack's GlobalSpec series pages; rows with only one source are marked
- Page: https://xemstudio.com/objects/ball-transfer-units/ · JSON: https://xemstudio.com/api/geometry?object=ball-transfer-units · Plain text: https://xemstudio.com/objects/ball-transfer-units/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
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**Exact dimensions.** Every file is drawn at true size with no tolerance added. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your process's clearance before making the part.

## Notes

- Ball transfer units (ball rollers, ball casters, ball transfers, 'ball bearing tables') are a captive large ball on a bed of small balls in a housing, used to build omnidirectional load tables. They come in three mounting families: clip-in (Alwayse Euro units: the unit drops into a plain hole in the table and a 3-prong clip fixes it from the top face), flange (screws through two or four holes) and threaded stud. B is the height of the ball top above the mounting plane, C how far the ball stands out of the outer ring, A the largest diameter (the flange).
- Where the numbers come from and how far they can be trusted: the Alwayse catalogue (Euro units table) was read with a scrambled text extraction, so only rows whose columns could be matched to the maker's own product pages are shown: for 515-2 (ball 15.8: D 24, B 9.5, L 21, A 31, F 2.8, C 3.2, seating hole 25.0 to 25.5 for a 2 mm table, 60 kg) and 522-0 (ball 22.2: D 36, B 9.8, L 30, A 45, F 2.8, C 4.3, 160 kg) the catalogue row and the tuli-shop data page agree. The 530-0 and 545-0 rows are the catalogue's only (column order checked on 515 and 522, so the same order is read here); their loads and seating holes are not shown. The catalogue's load for 522-0 read 100 kg in the scrambled text; tuli-shop and RS both give 160 kg, which is used.
- Omnitrack's per-model data (ball, body, height, hole pattern) is behind a sign-in on the sources read; GlobalSpec's series pages give only ranges (ball 12.7 to 102 mm, body 23.8 to 228 mm, square flanges of 1-3/4, 2-1/4, 3, 5 and 7 in, fixing centres 'on request', load 100 to 10,000 lb). No hole spacing is claimed for Omnitrack. For a hole pattern from a published source use the Alwayse 3000: two holes Ø5.1 mm on 44.5 mm centres.
- Left out: Alwayse mini (11MI), thread, tube, base fixing, heavy duty 800, Hi-Tech, spring loaded and die lifter series (catalogue tables not readable), other makers' units, and the interior (inner race, balls, seals), which no source gives as numbers. No file: the ball position inside the housing and the outer ring profile are not published, so a solid would be guessed.

## 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 |
|---|---|---|---|---|
| seating hole (Euro clip units) | Ø25.0 to 25.5 for the 515-2 (body Ø24); Ø37 to 37.5 for the 522 (body Ø36), per RS | a plain hole in a table 2 to 3 mm thick, clip-in from the top | designed | all |
| flange holes (Alwayse 3000) | 2 × Ø5.1 on 44.5 mm centres; seating hole Ø30 | two screws through the flange; a Ø30 hole for the housing | designed | all |

## Sizes

| unit | ball Ø, mm | body Ø D, mm | max Ø A, mm | overall length L, mm | ball working height B, mm | ball exposure above outer ring C, mm | flange thickness F, mm | under flange to base E, mm | fixing | max load, kg | source |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Alwayse 515-2 (type 16), Euro unit | 15.8 | 24 | 31 | 21 | 9.5 | 3.2 | 2.8 | 11.5 | clip, seating hole Ø25.0 to 25.5 in a table 2 mm thick | 60 | Alwayse data via tuli-shop; catalogue 515-0 row has the same numbers |
| Alwayse 522-0 (type 13), Euro unit | 22.2 | 36 | 45 | 30 | 9.8 | 4.3 | 2.8 | — | 3-prong clip; RS: seating hole Ø37 to 37.5 in a 3 mm table | 160 | tuli-shop + RS; catalogue row agrees |
| Alwayse 530-0 (type 13), Euro unit | 30 | 45 | 55 | 37 | 13.8 | 5.5 | 4 | — | clip (CL14-30 in the catalogue) | — | catalogue row only |
| Alwayse 545-0 (type 13), Euro unit | 44.5 | 62 | 75 | 53.5 | 19 | 9 | 4 | — | clip (CL14-45 in the catalogue) | — | catalogue row only |
| Alwayse 3000 (type 14), flange unit | 19 | 29.1 | 61 | — | 10 | 3.2 | 3.2 | 12 | 2 flange holes Ø5.1 on 44.5 centres; seating hole Ø30 | 20 up / 10 down | tuli-shop (Alwayse data) |
| Omnitrack 91 series (threaded stud) | 12.7 – 76.2 | 19.99 – 160 | — | — | — | — | — | — | stud 5/16, 1/2, 3/4, 1 in UNF or ISO metric | 45 – 4535 (100 – 10,000 lb) | series ranges only |
| Omnitrack 92 series (flange mounted) | 12.7 – 102 | 23.83 – 228 | — | — | — | — | — | — | square flange 1-3/4, 2-1/4, 3, 5, 7 in (2 or 4 holes; models 9200 / 9210 round / oval, 2 holes) | 45 – 4535 | series ranges only |
| Omnitrack 93 series (flange socket) | 12.7 – 76.2 | 23.8 – 160 | — | — | — | — | — | — | square flange 1-3/4 to 7 in; models 9300 round, 9310 oval (2 holes) | 45 – 4535 | series ranges only |

## Where the files are

- Alwayse Engineering (catalogue PDF, loziska-policka.cz copy): [Ball transfer units catalogue: Euro units type 13 (515 / 522 / 530 / 545), flange, thread, tube and base fixings](https://www.loziska-policka.cz/user/documents/upload/ALWAYSE - Ball Tranfer Units.pdf) — web — Maker catalogue; numbers only. Text extraction partly scrambled
- tuli-shop (Alwayse data): [Alwayse 515-2 type 16: ball 15.8, D 24, B 9.5, L 21, A 31, F 2.8, E 11.5, C 3.2, seating hole 25.0 to 25.5, 60 kg](https://www.tuli-shop.com/alwayse-ball-transfer-unit-515-2-16) — web — Publisher's page; dimensions are facts
- tuli-shop (Alwayse data): [Alwayse 522-0 type 13: ball 22.2, D 36, B 9.8, L 30, A 45, F 2.8, C 4.3, 160 kg](https://www.tuli-shop.com/us/alwayse-ball-transfer-unit-522-0-13) — web — Publisher's page; dimensions are facts
- tuli-shop (Alwayse data): [Alwayse 3000 type 14 flange unit: ball 19, D 29.1, A 61, B 10, E 12, C 3.2, F 3.2, 2 holes on 44.5 centres, hole Ø5.1, seating hole 30](https://www.tuli-shop.com/us/alwayse-ball-transfer-unit-3000-14) — web — Publisher's page; dimensions are facts
- RS Components: [Alwayse 522213 (22.2 ball): 3-prong clip, suggested seating hole Ø37 to 37.5 for a 3 mm table, 160 kg](https://uk.rs-online.com/web/p/ball-transfer-units/2006368) — web — Publisher's page; dimensions are facts
- Omnitrack (GlobalSpec): [91 series threaded stud ball transfer units: series ranges for ball, body, stud threads (per-model data gated)](https://datasheets.globalspec.com/ds/omnitrack/91-series/90a15af7-ea0d-4199-8fac-82aa182d569d) — web — Publisher's page; dimensions are facts
- Omnitrack (GlobalSpec): [92 series flange mounted heavy duty units: ball 12.7 to 102 mm, square flanges 1-3/4 to 7 in](https://datasheets.globalspec.com/ds/omnitrack/92-series/e491017f-043f-4100-99fe-15c58b6e8a06) — web — Publisher's page; dimensions are facts
- Omnitrack (GlobalSpec): [93 series flange socket units: ball 12.7 to 76.2 mm, square flanges 1-3/4 to 7 in](https://datasheets.globalspec.com/ds/omnitrack/93-series/2ad37c64-c4b9-4e1a-9bc9-4bd8e908605e) — web — Publisher's page; dimensions are facts

## Questions

**What size hole does a 15.8 mm ball transfer unit need?**

Alwayse 515-2 (ball 15.8, body Ø24): a seating hole Ø25.0 to 25.5 in a 2 mm table.

**What is the flange hole spacing of an Alwayse 3000 ball transfer?**

Two holes Ø5.1 mm on 44.5 mm centres, flange Ø61 × 3.2, ball Ø19.

**Do Omnitrack ball transfer units have a standard hole pattern?**

Their flange units have square flanges of 1-3/4, 2-1/4, 3, 5 and 7 in; the per-model hole centres are not in the public data read (and 'alternative fixing centres' are offered on request).

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