US Fasteners

Wood screw

Wood screws

Screws with a smooth shank and tapered point for use in wood.
Hex bolt

Hex bolts

Bolts with hexagonal heads and machine threads for use with a nut or in a tapped hole. Also known as hex cap screws or machine bolts.
Machine screw

Machine screws

Screws with machine threads for use with a nut or in a tapped hole.
Carriage bolt

Carriage bolts & Plow bolts

Bolts with no drive, and machine threads for use with a nut.
Lag bolt

Lag bolts

Large wood screws technically called lag screws.
Nut

Nuts

Nuts have internal machine threads, for use with machine thread bolts and screws.
Washer

Washers

Used to spread the load of a bolt or screw over a larger area or to help prevent loosening under vibration.
Rod & Stock

Studs, Rod & Stock

Studs, threaded rod, unthreaded rod and keystock for industrial, machining and manufacturing applications.
Cotter pin

Cotter pins

Cotter or split pins have two tines which are bent apart to hold them in place.