BRECOflex CO., L.L.C. offers the most precise tolerances for superior belt drive performance. BRECOflex metric pitch pulleys conform to DIN 7721 tolerances while English pitch pulleys conform to DIN ISO 5294 tooth forms. All other pulley dimensions conform to DIN 7168 standards. Choosing a BRECOflex belt and pulley guaranties optimal belt matching and low friction drive components.
Outside diameter and bore:
| Tolerance | |
| Outside Diameter | h8 |
| Bore | H7 |
Concentricity
| Outside Diameter | Max Concentricity |
| 0 to 200 | 0.05mm |
| Over 200 | Additional 0.005mm per 10mm of outside diameter |
Note: Made-Order-Pulleys: Outside diameer to Bore Stock Pulleys: Hub to Bore
Run-Out
| Outside Diameter | Max Run-out |
| 0 to 100 | 0.10mm |
| over 100 to 250 | 0.01mm per 10mm of outside diameter |
| over 250 | additional 0.005mm per 10mm of outside diameter |
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