... in manufacturing fasteners such as bolts,screws,studs,nuts,washers,threaded Rods,pins,rivets,stamping,circlips and other nonstandard ... , A4-80. Material: 304, 316, 316L.6. International internal and external hexagon bolt with the mechanical property of Grade 4.8 ... 5 and 8.7. Various nuts, flat gaskets, spring washers, mechanical bolts, tapping screws, fibreboard screws and hexagonal wood screws ...