... 40Cr, 35CrMoA, 42CrMoA, 25Cr2MoVA, 35VB, 40CrNiMo,Stainless steel and so onSizeM6-M42 LengthM16-300Type of headSquare,Hex,Flange,Hex ... treatmentBlack Oxide,Zinc plated,hot dip galvanized,Dacrotizing plated and your requirementOthersWe can make accroding to your drawing ... wheel ,acorn,tapper,and so onRegarding to Washers Type of WasherRound ,Square,Plat,Friction,Plate ASTM A325 NUTS AND BOLTS HARDWARE