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Specification:Name: HTD5M Timing Pulley Synchronous Wheel D HoleMain Material: Aluminum Alloy (The flange is inspired iron)Surface Treatment: UntreatedType: AF TypeTeeth Pitch: 5mmTeeth Number: sixteen TeethD Hole: d1xd26x5mm 8x7mm 8x7.5mm 10x9mm 12x11mm Slot Width: 16/21mm (suitable for timing belt width 15/20mm)Bore Tolerance: 0-0.03mmFeatures:Compared with the through hole + screw locking method, the D-type inner hole can resist torque extra and is not easy to slipNote:1.We will carry the fixed machine screws, and the most important for the keyway needs to be purchased separately.2.The synchronous wheel is manufactured from aluminum alloy with galvanized iron on the guard edge. The floor is not treated, and there may be a little oxidation.3.Overall dimensions (total thickness, screw hole, flange diameter, etc.) may exchange in step with diverse batches and won't be separately notified.Package:Packing : Plastic bag / Carton box.Quantity : According to your Choose!