B.. Glossary of Fastener and Fixing Terminology
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GLOSSARY ALPHA LOCATOR
BARREL NUT
An internally threaded screw having a slotted head, used in the furniture industry. Product
BASIC THREAD PROFILE
This is the theoretical profile of external and internal threads with no manufacturing tolerance applied.
BEAM CLAMP ®
Fasteners used in steel construction that eliminate the need for drilling, welding and riveting. Product
BEARING NUTS
Bearing nuts are also known as slotted Hook nuts and are used to lock bearing onto shafts and shafts onto housings. Product
The surface pressure acting on a joint face directly as a result of the force applied by a fastener.
BELLEVILLE WASHER
A Belleville washer, also known as a coned-disc spring, conical spring washer, disc spring, or cupped spring washer, is a type of spring shaped like a washer. It has a frusto-conical shape which gives the washer a spring characteristic. The Belleville name comes from the inventor Julien Belleville who patented the design in France in 1867 Product
BIFURCATED RIVET
A small rivet having a split end for securing by spreading the ends called a Bifurcated rivet Product
BI-HEXAGON HEAD
Bolt or screw whose cross section of its head is in the shape of a 12 pointed star, also called 12 point bolts and Ferry bolts. Product
BI-LOCK ® NUTS
Centre lock and bi lock nuts have deformed threads in the centre of the nut acting as an all metal prevailing torque thread locking mechanism Product
BINDING HEAD
Rounded top surface and slightly tapered sides. The bearing surface is flat with annular undercut optional.
Generally used in electrical and radio work because of its identifying undercut beneath the head, which binds and eliminates fraying of stranded wire. Offers an attractively designed, medium-low head with ordinarily sufficient bearing surface. Not ordinarily recommended as a Phillips Recessed head, generally available slotted, often confused with the Pan Head. Product
BINX® NUT
Binx® nuts have two slots on the head of the nut and are dimensionally no bigger than a standard full nut. The Binx Nut’s design incorporates two opposing cantilevers which lock into the mating part with inward and downward pressure minimising thread wear and enabling the nut to be removed and replaced. Binx Nuts are also unaffected by minor temperature fluctuations or contaminants. Product
BLACK BOLTS AND NUTS
A traditional term relating to low grade 4.8 and below bolt and nut product that historically would have been black Today the word black refers to the comparatively wider tolerances and not necessarily to the colour of the surface finish of the fastener. Product
BLIND RIVET
Blind rivets, referred to by the generic name of "pop" rivets. POP® was the original brand name of Tucker in 1938.
Blind rivets are tubular and are supplied with a mandrel through the centre. The rivet assembly is inserted into a drilled hole and a tool is used to draw the mandrel into the rivet. This expands the blind end of the rivet and then the mandrel snaps off. Product
BOLT
Bolt is the term used for a partially threaded fastener, with a head; designed to be used with a nut. The American term for the same product is Cap Head but this generally only covers hexagon heads. Detail Product types
BREAKAWAY TORQUE
The torque necessary to put into reverse rotation a bolt that has not been tightened, the breakaway usually caused by vibration.
BREAK-LOOSE TORQUE
The torque required to effect reverse rotation when a pre-stressed threaded assembly is loosened.
BRINELL HARDNESS TEST
This test consists of forcing a ball of standard diameter into the specimen being tested under standard pressure and judging the hardness of the material by the amount of metal displaced.
BRITISH STANDARD BRASS
Specialist thread form based upon the Whitworth thread and consisting of 26 threads per inch whatever the thread diameter.
BRITISH STANDARD CYCLE THREAD BSC
BSC Thread has extra fine threads 26 TPI originally for use on Bicycles and motorcycles. the thread runs at a 60 degree rather than a 55 degree angle.
BROACHING
Broaching is the process of removing metal by forcing a cutting tool, called a broach, to form a profile, which will duplicate the profile of the broaching tool. It is used for the production of the internal drive for socket screws produced in small volumes.
BSF
British Standard Fine. A thread form based upon the British Standard Whitworth form but with a finer thread; more threads per inch and has the same thread angle as the BSW and smaller thread depth.
BSF was developed by R E B Crompton and his assistant George Field and was first introduced in 1908, the thread form is specified in BS 84: 1956. Detail
BSI BRITISH STANDARDS INSTITUTE
The United Kingdom authority for technical standards. Standards
BSW 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
BUGLE HEAD
Similar to countersunk head with a smooth progression from the shank to the angle of the head, similar to the bell of a bugle. Bugle heads that allows the screw to depress the wood surface without breaking it. Used with Decking and Drywall screws.
BUMP THREAD
A modified thread profile the Bump thread form has a small projection at the pitch diameter that eliminates the clearance from the thread assembly on both flanks. By doing this it is claimed that resistance to vibration loosening is significantly improved.
BUTTON HEAD
This is an internal socket (Allen) head screw type with a rounded head used in furniture assembly Product
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