5/16-18 Hexagon Bolt Kit: BNUOK 5/16-18 x 1/2 Inch black bolts with hex nuts,Flat & Lock Washers Head Diameter,with bright finish,clean & smooth thread and no burrs,This Hexagon black bolts makes your project look more professional which are favoured for heavy-duty fastening applications. 304 Stainless Steel:This hex nuts and bolts, washers are 100% made of high quality 304 stainless steel,black zinc plated, which has superior anti-rust and abrasion resistance.Bolts hex head is not easy to strip,better torque transmission but also more stable performance Details:Thread Diameter: 5/16"; Thread Pitch: 1/18"; Screw Length: 1/2". Head Diameter: 0.5",Meet ASME B 18.2.1 specifications. Widely Use:This stainless steel 5/16 hex bolt sets are fit for precision mechanical and industrial applications,household appliances,engines,automotive part,motorcycle accessories repairs and small repairs such as door handles,lamps,locks. Quantity & Size: You will get 18 Sets 5/16-18 x 1/2 Inch bolts,SAE bolt nut kit provide 1:1:1 matching combination,each Bolts matching a hex nut ,Flat & Lock washers,Please connect us,if any problem. BNUOK 5/16-18 x 1/2" Hex Head Screws Bolts,Hex Nuts,Flat & Lock Washers,304 Stainless Steel 18-8,Black Zinc Plated,Fully Threaded(18 Sets)