Specification: 1.Roundness:0.001 2.Roughness:ra1.0 3.Straightness:0.01 4.Hardness:hrc24-28 5.Diameter tolerance range :+0, -0.004 6.Heat treatment :point hardening;quenching hardening. Coupling shaft is made by cnc machine and we can produce as per your sample or drawing. Coupling shaft is made by cnc machine and we can produce as per your sample or drawing. The material available: c45, brass, stainless steel, 20crmnti, 40cr, 20cr and so on. Different surface treatment is available, such as: blackening, white zinc coating and so on. Different heat treatment is available: quenching, case hardening, nitriding, tempering and so on. Packaging & delivery Packaging detail: 1.Standard export packing; 2.According to clients' requirement; Packagings:polybag and carton, 0.5-15kg/carton , pallet or container, as per customized specifications. Delivery detail: Moq: 1pcs Lead time:15-30 days Qc system: 100% inspection before shipment Payment terms: 30% t/t in advance, 70% before shipment Place of origin: ningbo, china Shipment terms: 1)0-100kg: air freight priority, 2)>100kg: sea freight priority, 3)as per customized specifications.