... steel 2.Surface:Zinc Plated,self colour 3.Thread Size:1/4-M16 Spring Nut 1) Description:channel spring nuts , spring channel nuts , channel ... and material:a) normal strength: made from low carbon steel, C1015, Q235 etcb) high strength: made from high carbon ... C1035, C1045, etc, And with hardened treatment.-material: carbon steel, stainless steel, SS304, SS316. etc.-3) Surface treatment:plain/self colour ...