Starter and alternator sizes
Typical starter motor and alternator commutators
Twelve groove-type sizes from 21 to 69 segments, named by segment count the way repairers search. Every one is made to order, priced on request in pounds and supplied with a UK VAT invoice. Can't see yours? We make to measure. Industrial or large commutator? Use the full data sheet.
All sizes
Dimensions are the A to E measurements in millimetres, as on the drawing. Check them against your armature, or send us a photo and we'll check for you. Pick a size and request a price; we send a firm price and lead time within 2 working days.
UK supplier
21 segment commutator
Price on request
UK supplier
24 segment commutator
Price on request
UK supplier
27 segment commutator
Price on request
UK supplier
30 segment commutator
Price on request
UK supplier
37 segment commutator, Bosch
Price on request
UK supplier
39 segment commutator
Price on request
UK supplier
41 segment commutator
Price on request
UK supplier
46 segment commutator
Price on request
UK supplier
49 segment commutator
Price on request
UK supplier
53 segment commutator
Price on request
UK supplier
58 segment commutator, Bosch
Price on request
UK supplier
69 segment commutator
Price on request
Can't see yours?
Your measurements and a photo, or the armature's OEM number. We'll match it and send a price within 2 working days.
Size table
All twelve at a glance. A riser diameter, B bore, C brush diameter, D total length, E riser width.
| Segments | A (mm) | B (mm) | C (mm) | D (mm) | E (mm) | Fits | Price |
|---|---|---|---|---|---|---|---|
| 21 | On request | On request | On request | On request | On request | Starter and alternator armatures | Price on request |
| 24 | On request | On request | On request | On request | On request | Starter and alternator armatures | Price on request |
| 27 | On request | 32 | 80 | 60 | 5 | Starter armatures | Price on request |
| 30 | 37 | 15.7 | 34 | 28.1 | 6 | Bosch starter armature 1104012061 | Price on request |
| 37 | 53 | 15.5 | 34.6 | 30 | 5 | Bosch starter armatures | Price on request |
| 39 | 48 | 19 | 42 | 28 | 4 | Bosch starter armatures | Price on request |
| 41 | 62 | 15.7 | 44 | 27.1 | 5 | Bosch 0010350 series dynastarters, 2014004001 | Price on request |
| 46 | 110 | 29 | 82 | 58 | 5 | Bosch starter armatures | Price on request |
| 49 | 110 | 37 | 81 | 70 | 8 | Starter armatures | Price on request |
| 53 | 82 | 29 | 66 | 46 | 6 | Starter armatures, Bosch 1004007014 type | Price on request |
| 58 | 116 | 34.5 | 79.5 | 78 | 8.5 | Bosch starter armature 1004007014 | Price on request |
| 69 | 112 | 32 | 80 | 60 | 5 | Bosch starter armatures | Price on request |
Typical dimensions. Every dimension is confirmed against your measurements or drawing with the quote.
Got a drawing, or just the old part? Send it over.
A drawing in any format, or photos of the old commutator with its dimensions, is enough for us to quote. Use the form or email it. We reply to every enquiry within one working day.
Monday to Friday, 8.30am to 5pm. Richmond, Surrey.