Full, Lock, Nyloc, and Flange (SERR). All materials and sizes available.
Material
Steel: C1008, C1015, C1022
Stainless steel: SUS302, SUS304, SUS316, SUS410, SUS430
Alloy steel: 35ACR, 40ACR, SCM435, 10B21, 10B22, 10B38
Others: Brass, Copper alloy, Nickel alloy
Surface treatment
Zinc Plated (Cr3+) (Cr6+), Nickel Plated, Black Zinc, Yellow
Zinc, Passivated, Anodizing.