SPSPP(镀硬铬产品,镀层厚度 t≧3μm)
Suj2
≧HRC58
g6 h5
6×2, 8×3, 10×4, 12×6, 13×7, 16×10, 20×14, 25×16, 30×17, 35×19, 40×20, 50×26