How to identify your PU Timing Belt
Understanding how to identify your PU Timing Belt, is an important first step when purchasing replacement belts.
Synchroflex®, Breco®/Brecoflex® and Conti® 8M & 14M PU timing belts all have a groove between the teeth. Firstly, count eleven grooves and accurately measure the distance between the first and last groove, then divide the measurement by ten. This will give you the pitch of the belt in mm. Next, using a vernier or digital calliper measure the thickness of the belt. Common combinations are in the table below;
| Toothform | Pitch (mm) | Thickness (mm) | Brand(s) |
| K1.5 | 1.5 | 1.2 | S |
| T2 | 2 | 1.1 | S |
| Minipitch – MP (MXL) | 2.032 | 1.15 | S |
| T2.5 | 2.5 | 1.3 / 1.7 | S/B |
| AT3 | 3 | 1.9 | S/B |
| 3M | 3 | 2.4 | CS |
| T5 | 5 | 2.2 | S/B/BFX |
| AT5/ATK5 | 5 | 2.7 | S/B/BFX |
| ATL5 | 5 | 2.9 | B |
| 5M | 5 | 3.6 | CS |
| T1/5 (XL) | 5.08 | 2.54 | B/BFX/CS |
| 8M | 8 | 5.6 | CS |
| T3/8 (L) | 9.525 | 3.55 | B/BFX/CS |
| T10 | 10 | 4.5 | S/B/BFX |
| AT10/ATK10 | 10 | 5.0 / 4.5 | S/B/BFX |
| ATL10 | 10 | 4.8 | B |
| ATP10 | 10 | 5.0 / 4.7 | S/B/BFX |
| BAT10/BATK10 | 10 | 4.7 | B/BFX |
| T1/2 (H) | 12.7 | 4.18 | B/BFX/CS |
| 14M | 14 | 10.0 | CS |
| ATS15 | 15 | 6.5 | S/B/BFX |
| ATP15 | 15 | 6.6 | S/B/BFX |
| T20 | 20 | 8.0 | S/B/BFX |
| AT20/SFAT20/ATL20 | 20 | 8.0 / 8.4 / 9.0 | S/B/BFX |
| T7/8 (XH) | 22.225 | 11.07 | B/BFX/CS |
If you are at all unsure, please consult us, as the difference between many pitch/toothforms is tiny.
Brands – S = Synchroflex®, B = Breco®, BFX = Brecoflex®, CS = Conti® Synchrodrive
