... or not the first, male and female screw series, ordinary screws Material:carbon steel Fasteners1. Products ... diametre rangethe largest is 35mm5Surface treatmentZinc,Nickle,Passivated,Tin-plated,Sandblast &Anodize,Chromate,6Heat treatmentsoft, case harden, Grade4 ... Phillips, Phillips tamper-resistant, Square,Square recess14webistewww.tf-screw.comScrew head styles:We are china factory,we have ...