Nuts are perforated metal blocks with internal or female threads which are used with bolts and some screws in order to secure components. There are many sizes and varieties of nuts; each with a particular fastening purpose. Some nuts can be applied without tools, and others may have special designs to prevent the nut from loosening.
Main Manufacturing processes
- Cold forming
It is the most common method. Machinery cuts round wire to the proper length, shapes the wire into a hexagon nut and punches the hole
- Hot forming
It is similar to cold forming method except that the raw material is heated to forging temperature before being fed into the machine
- Cold punching
Rectangular bar stock is fed into the machine and, in successive steps, a hole is punched and countersunk. The bar is sheared and the nut is beveled and trimmed
Classification and Standards
The main variances in nuts are those with locking mechanisms and those without locking mechanisms. It would be impossible to create an unabridged listing of every type of nut available, but some of the most common are featured below:
- Non-Locking Nuts
Acorn nuts (DIN 1587), Anchor nuts (DIN 7965, DIN 65243 aerospace), Coupling nuts (DIN 6334), Hex nuts (DIN 934), Round nuts (DIN 546, DIN 1804), Square nuts (DIN 557, DIN 562), Weld nuts (DIN 929), Wing nuts (DIN 315)...
- - Locking Nuts
Castle nuts (DIN 935), Flange nuts (DIN 6923), Insert / Self-locking nuts (DIN 985, DIN 982), Jam nuts (DIN 936, DIN 439), Pal nuts (DIN 7967), Tee nuts (DIN 508)...
Nuts can be made in a huge range of materials such as steel, hardened steel, stainless steel, aluminum, brass, copper alloy, plastic, reinforced plastic, Nylon, Polyvinyl chloride (PVC), Rubber, Titanium, ...