Nuts and bolts: hex bolts, hex bolts, cup head bolts, countersunk head bolts, T-bolts, carriage bolts, hex flange bolts, set of pads combination bolts, bolts of various lathes, and special non-standard screws, bolts and other environmental protection . 
 Screw type: general machine screws, hex machine screw, high strength machine screw, set screw machines, combined screws, countersunk head screws, machine screws, electronic screws, washers combination of machine screws, screw machine lathes, and special non- standard machine screws. 
 Self-tapping screw type: semi-circular self-tapping screws, pan head self-tapping screws, countersunk head self-tapping screws, hex furniture screws, hex self-tapping screws, slotted screws, wallboard screws, dry wall screws self-tapping screws, self tapping a variety of drilling, plastic screws, a combination of self-tapping screw washer, instrument lathe self-tapping screws, all kinds of special non-standard self-tapping screws, self tapping screw environmental protection. 
 Nuts: Hexagon nuts, Hexagon thick nuts, flange nuts, weld nuts, self-locking nuts, disc nut, cap nut, slotted nut, hex nut with precision machinery, a variety of instrument lathe nuts, all kinds of special non-standard nuts, green nut. 
 Washer categories: spring washer, internal and external daisy washers, lock washers, washer, tapered serrated lock washers, wave washers, lock washers and external tooth, large washers, flat washers, small washers, special-shaped non-standard washer and environmental protection washers and so on.