W.. Glossary of Fastener and Fixing Terminology
GLOSSARY ALPHA LOCATOR
A washer is a part having a centrally located hole. The washer performs various functions when assembles between the bearing surface of a fastener and the part being attached. Insulation, lubrication, increasing the bearing area over large clearance holes to improved stress distribution are just a few design attributed. Products Technical dimensional detail
A washer head is a fastener head having a flanged collar under the head of the fastener to provide a bearing surface. Commonly known as a flange head, relative to the generic product type. Product
A washer face is a circular boss under the head of the fastener, providing a bearing surface. Applicable for a bolt or nut.
WAISTED SHANK BOLT
A bolt whose diameter is less than the minor diameter of the thread. Frequently the shank of the bolt is 0.9 times the root diameter.
Wave Spring Washers for pre-loaded bearings in electric motors Product
Regulations for those involved in the manufacture, sale and subsequent disposal of Waste Electrical and Electronic Equipment (WEEE) Details
These nuts are very similar to standard square or hex nuts, but have a locating boss and welding projections (lugs, nibs and pips). The bosses help to keep weld spatter out of the thread. Hexagon Square Round
Projection welding applied to screws offer a means of providing attached threaded members in sheet metal construction. Welding projections (lugs, nibs and pips) on the head of the screw reduce the amount of current required for surface welding and provide fusion of metal at predetermined points. Product
Stud welding is a process where the stud is welded onto another metal part. The studs are either threaded, un-threaded or tapped.
The different methods of stud welding are:
- Capacitor discharge CD weld studs have a projection tip at the end of the stud. This process uses a direct-current arc from a capacitor when the tip disintegrates, it melts and helps solidify the weld to the base material.
- Spot welding where the stud will have projections (lugs, nibs and pips) are melted to form the weld. Product
WHEEL NUTS & BOLTS
WHIT OR WHITWORTH
British Standard Whitworth. A thread form developed by Sir Joseph Whitworth in 1841. The thread form has rounded roots and crests, a thread angle of 55 degrees, the thread form is specified in BS 84: 1956. Product Detail
One-piece, round threaded nuts with wing lugs for ease of manual assembly. Particularly suited to applications where frequent removal and replacement or adjustment are required. Product
Special screws with projection heads. used in where a finger tightened screw is needed for frequent adjustments or for rapid removal and assembly applications. Product
WIRE THREAD INSERT
Threaded insert that is typically used for tapped hole repair or to improve the thread stripping strength of softer metals such as zinc and aluminium. The inserts are assembled into a previously tapped hole using a special driving tool. Thread locking compounds are frequently used to secure the insert if the assembly is subject to vibration. Product
A metal screw having a driver head, a gimlet point, and a sharp- crested, coarse pitch thread, for insertion in wood or resilient materials. It produces its own mating thread. Product
A semi-circular or half-round piece, resting in a circular groove cut in a shaft. Sometimes referred to as a half-moon key. Largely used in machine tool building. Product
WRENCH KEY HEXAGON
Hexagon wrench keys are available as individual 'L' keys, as keys with T handles, also as knife sets and can be produced with ball ends for flexible engagement. Product