Xem Studiomeasured geometryLibrary › Hardware › Bearings, rails & motion ·
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? · 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
Also called: ball transfer unit dimensions, ball transfer unit 15.8 mm, ball transfer 22 mm, alwayse 515, alwayse 522, alwayse ball transfer, omnitrack ball transfer, ball roller dimensions, ball transfer unit hole size, ball transfer unit seating hole, ball transfer flange mounting holes, ball transfer table ball size, ball transfer unit stud thread, omnitrack 91 series
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. Mating features
- sizes
- 8 in table
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.
Ball transfer units: Alwayse Euro units 515 / 522 / 530 / 545 and… size chart
| 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 |
Mating features
Drawn at the exact size. Open press, slide, run and socket features by your process's clearance (tolerances by process); leave designed gaps and clamp fits 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 |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
Xem scan
File coming
No downloadable true-size file yet: the published figures do not fix the whole shape, and Xem never guesses a number. A measured scan is planned; request it and it moves up.
https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.Plain text: sheet.txt · JSON: /api/geometry?object=ball-transfer-units
Fits with
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).