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"text": "Match the inner diameter (ID) to your fitting or barb OD
A complete coupling requires one matching plug and one socket of the same size code
The tooth count determines your drive ratio and belt speed
Use light pressure and appropriate speeds to avoid tearing the thin material
5M AF-Type Timing Belt Pulley 35T/40T Synchronous Wheel For 15mm/20mm Width Belt Tech Repair Accessories "text": "Match the inner diameter5M AF Type Timing Belt Pulley Precision Synchronous Drive for 15mm & 20mm Belts When your DIY automation project demands slip free, synchronized motion, a mismatched or poorly machined pulley is the first thing that will let you down. Whether you are a maker building a CNC router, a small workshop running a conveyor, or an engineer prototyping a linear actuator, the 5M AF Type Timing Belt Pulley gives you a reliable, drop in synchronous drive
