Clutch button copper Friction coefficientμd 0.30-0.50Wear ratiocm3/nm ≤5×10-8Apparent hardness hb 30-55 Flexural strengthn/mm² ≥60 Our advantage: 1.Production experience:nearly 8years 2.Items' availability:Nearly 20 part numbers for clutch parts of heavy duty,tractor,,etc. 3.Production capacity:Over 2 million pcs annually 4.Delivery time:30days after prepayment received and order confirmed 5.Both smooth and rough are available About us: Our company is committed to development of the industry for many years,with advance technology and talents.To provide customers with the most satisfactory quality of product and thoughtful service. Material: Can be customized according to customers' requirement any specifications for your material product Function: Compliance with international safety certification,the product meet the national standards Supply capacity: Our company have been in this industy for many years,with advanced equipment and technology to ensure that the client within the required time to complete production Packing: Usually carton packaging,or PVC bag with a lable.Specifically according to the customer to your needs