24x165 Screw Spike Grade 5.6 (35K Material) with Fe6 Spring Washer HDG – Railway Fastener Product Overview Our 24x165 Screw Spike Grade 5.6 is a professional railway fastener manufactured with 35K carbon steel (35# steel) and paired with Fe6 spring washer, featuring hot-dip galvanized (HDG) surface treatment. With a fixed size of 24mm diameter and 165mm length, grade 5.6 strength, this screw spike is engineered for railway track fastening to secure rails, sleepers, and rail