machining part 1.precise dimension 2 tight tolerance 3 heat treatment,blacked 4 good delivery machining part1.Material:AISI4140,4142,or4340 Alloy, or other material also can be available.2.Craft:Part cutting, CNC machining, drilling and reaming hole, heat treatment and blacken.3.Finish: heat treatment RC 50-55, Blacked, other coating also can use as per customer's requirement.4.various size can ...