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Taper-Lock bushings 1008 to 5050: bore range, length through bore, set screw and cap screw sizes
What are the dimensions of a Taper-Lock bushing (1008, 1108, 1210, 1610, 2012, 2517, 3020 and so on): bore range, length and screw size? · Standard part · basis: A-Metric Taper-Lock table (bore ranges, length, screws), length and 1008 to 1310 bore ranges confirmed by Tsubaki, 1108 by Martin's sheet; partial by design
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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. Mating features
- sizes
- 18 in table
Notes
- Taper-Lock (A-Metric, Tsubaki) or taper bushing (Martin) is a split tapered bushing that clamps a hub to a shaft; the table lists the sizes from 1008 to 5050. The bushing number is the style (1008, 1108, 1210 ... 5050); a hub or sprocket 'for 1210' fits any bore the 1210 bushing is cut to.
- Table: length through bore L and screw sizes from A-Metric's Taper-Lock page (inch group), bore ranges from the same page (metric group). L of the first five bushings equals the B column of Tsubaki's table (7/8, 7/8, 1, 1-1/2, 1 in; Tsubaki does not label the column), whose inch bore ranges (0.500 to 1.000, 1.125, 1.250, 1.250, 1.375 in for 1008 to 1310) are also used. Martin's 1108 sheet agrees on the 0.500 to 1.125 in range and on two 1/4-20 × 1/2 set screws tightened to 55 in-lb. Bores outside the table's range are special.
- Metric bore range note: A-Metric's metric group lists 2517 and 2525 as 'BSW' versions with the screw sizes in the inch rows differing slightly from the ANSI ones, and shows 3525 to 5050 with socket-head cap screws. The ranges are one maker's list; check the catalogue for the exact bore and keyway.
- Left out: flange diameter and bolt circle. Tsubaki and Martin print columns A and D (A 1.386 / 1.511 / 1.875 / 1.875 / 2.000 in and D 1.328 / 1.453 / 1.750 / 1.750 / 1.875 in for 1008 to 1310) but the pages read do not say which is which, so neither is shown; do not use them for a pocket. The tapered outside diameter, the taper, keyway sizes (only Martin's 1108 table was read) and weights are not tabulated.
- No files: the tapered outside diameter and the split are not published in the tables read, so a bushing file would be invented. For a hub drawing, take the dimensions from the maker's CAD or catalogue (links below).
- Keys: bushings use parallel keys; sizes are on the parallel-keys-din-6885 and square-keys-inch pages.
Taper-Lock bushings 1008 to 5050: bore range, length through bore… size chart
| bushing | length through bore L, in (mm) | inch bore range, in | metric bore range, mm | screws per bushing (A-Metric: qty × size) |
|---|---|---|---|---|
| 1008 | 0.875 (22.2) | 0.500 to 1.000 | 11 to 25 | 2 × 1/4-20 × 1/2 set |
| 1108 | 0.875 (22.2) | 0.500 to 1.125 | 11 to 28 | 2 × 1/4-20 × 1/2 set |
| 1210 | 1 (25.4) | 0.500 to 1.250 | 11 to 32 | 2 × 3/8-16 × 5/8 set |
| 1215 | 1.5 (38.1) | 0.500 to 1.250 | 14 to 32 | 2 × 3/8-16 × 5/8 set |
| 1310 | 1 (25.4) | 0.500 to 1.375 | 14 to 35 | 2 × 3/8-16 × 5/8 set |
| 1610 | 1 (25.4) | — | 12 to 42 | 2 × 3/8-16 × 5/8 set |
| 1615 | 1.5 (38.1) | — | 14 to 42 | 2 × 3/8-16 × 5/8 set |
| 2012 | 1.25 (31.8) | — | 15 to 50 | 2 × 7/16-14 × 7/8 set |
| 2517 | 1.75 (44.4) | — | 18 to 65 | 2 × 1/2-12 × 1 set |
| 2525 | 2.5 (63.5) | — | 20 to 60 | 2 × 1/2-12 × 1 set |
| 3020 | 2 (50.8) | — | 25 to 75 | 2 × 5/8-11 × 1-1/4 set |
| 3030 | 3 (76.2) | — | 35 to 75 | 2 × 5/8-11 × 1-1/4 set |
| 3525 | 2.5 (63.5) | — | 35 to 90 | 2 × 1/2 × 1-1/2 socket head cap |
| 3535 | 3.5 (88.9) | — | 35 to 90 | 2 × 5/8 × 1-3/4 socket head cap |
| 4030 | 4 (101.6) | — | 48 to 100 | 2 × 5/8 × 1-3/4 socket head cap |
| 4040 | 4 (101.6) | — | 48 to 100 | 2 × 3/4 × 2 socket head cap |
| 4545 | 4.5 (114.3) | — | 55 to 110 | 2 × 7/8 × 2-1/4 socket head cap |
| 5050 | 5 (127.0) | — | 70 to 125 | 2 × 7/8 × 2-1/4 socket head cap |
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 |
|---|---|---|---|---|
| keyway | parallel key per bushing bore (Martin 1108 sheet: 1/8 × 1/16 to 1/4 × 1/8 in by bore) | parallel key on parallel-keys-din-6885 / square-keys-inch | slide | all |
| set / cap screws | 2 per bushing: 1/4-20 × 1/2 (1008, 1108) to 7/8 × 2-1/4 (4545, 5050) | hub tapped holes of the same thread (see socket-head-cap-screws-inch) | designed | all |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| A-Metric | Taper-Lock type bushings: bore ranges (metric and inch), length through bore, set screw and cap screw sizes | web | Publisher's page; dimensions are facts |
| Tsubaki | TAPER-LOCK bushings 1008 to 1310 (dimension columns A, B, D, F2 and inch bore range) | web | Publisher's page; dimensions are facts |
| Martin Sprocket (via Raptor Supplies data sheet) | Taper bushing 1108: bore ranges, keyways, 1/4-20 × 1/2 set screws (2), 55 in-lb | web | Publisher's page; dimensions are facts |
| Tsubaki (US) | Roller chain, sprockets and TAPER-LOCK bushings: maker catalogue with CAD downloads | web | Publisher's page; dimensions are facts |
| Martin Sprocket | Martin Sprocket & Gear CAD library (sprockets, QD and taper bushings) | web | Publisher's page; dimensions are facts |
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=taper-lock-bushings-1008-to-5050
Fits with
Questions
What is the length of a 1210 Taper-Lock bushing?
1 in (25.4 mm) through the bore; the 1215 is 1-1/2 in. It takes 0.500 to 1.250 in bores and two 3/8-16 × 5/8 set screws.
What bore range does a 1108 Taper-Lock bushing cover?
0.500 to 1.125 in (A-Metric, Tsubaki and Martin's sheet agree); metric 11 to 28 mm.
What is the difference between Taper-Lock and QD bushings?
Both are split tapered bushings sized by a letter / number code. The QD (quick-disconnect) bushings in Martin's table use three cap screws on a bolt circle; the Taper-Lock bushings here use two set or cap screws. QD sizes are on the QD bushing page.