What is Bolt?
A bolt is a form of threaded fastener with an external male thread requiring a matching pre-formed female thread such as a nut.
Bolt v/s Screw
BOLT
Bolts are designed to pass through an unthreaded hole in a component and be fastened with the aid of a nut.
Bolts are often used to make a bolted joint. This is a combination of the nut applying an axial clamping force and also the shank of the bolt acting as a dowel, pinning the joint against sideways shear forces.
SCREW
Screws in contrast are used in components which contain their own thread, or to cut its own internal thread into them.
Where a fastener forms its own thread in the component being fastened, it is called a screw. This is most obviously so when the thread is tapered ( i.e. traditional wood screws), precluding the use of a nut.
BOLT CLASSIFICATION
- HEX HEAD BOLT
- HEX HEAD FLANGE BOLT
- CARRIAGE BOLT
- SOCKET CAP ALLEN HEAD BOLT
- SOCKET CAP COUNTERSUNK BOLT
- SOCKET BUTTON HEAD BOLT
- SOCKET BUTTON FLANGE HEAD BOLT
- PAN SLOT MACHINE BOLT
- COUNTERSUNK SLOT MACHINE BOLT
- PAN POZI MACHINE BOLT
- POZI COUNTERSUNK MACHINE BOLT
HEAD STYLE
- Hex
- Hex Washer
- Flat
- Hex Flange
- Button
- Oval
- Pan
- Round
- Truss
- Slotted Hex Washer
- Socket Cap
DRIVE TYPE
- COMBINATION
- ONE WAY
- PHILLIPS
- SLOTTED
- SOCKET OR ALLEN
- SQUARE
- STAR
What is Nut?
A nut is a type of fastener with a threaded hole. Nuts are almost always used in conjunction with a mating bolt to fasten multiple parts together. The two partners are kept together by a combination of their threads’ friction (with slight elastic deformation), a slight stretching of the bolt, and compression of the parts to be held together.
What is Locking Nut?
Many specialized types of nut exist to resist loosening of bolted joints, either by providing a prevailing torque against the male fastener or by gripping against the bolted components. These are generally referred to as locknuts.
TYPE OF NUTS
- Hex
- Heavy Hex
- Nylon Insert Lock
- Jam
- Nylon Insert Jam Lock
- Wing
- Cap
- Acorn
- Flange
- Tee
- Square
- Prevail Toque
- K-Lock
- Coupling
- Slotted
- Castle
- Pin Lock
What is Washer?
A washer is a thin plate (typically disk-shaped, but sometimes square) with a hole (typically in the middle) that is normally used to distribute the load of a threaded fastener, such as a bolt or nut. Other uses are as a spacer, spring (Belleville washer, wave washer), wear pad, preload indicating device, locking device, and to reduce vibration (rubber washer).
Washers are usually metal or plastic. High-quality bolted joints require hardened steel washers to prevent the loss of pre-load due to brinelling after the torque is applied. Washers are also important for preventing galvanic corrosion, particularly by insulating steel screws from aluminum surfaces. They may also be used in rotating applications, as a bearing. A thrust washer is used when a rolling element bearing is not needed either from a cost-performance perspective or due to space restraints. Coatings can be used to reduce wear and friction, either by hardening the surface or by providing a solid lubricant (i.e. a self-lubricating surface).
TYPES OF WASHERS
- FLAT TYPE
- FENDER TYPE
- FINISHING
- SPLIT LOCK
- EXTERNAL TOOTH LOCK
- INTERNAL TOOTH LOCK
- SQUARE
- DOCK
- OGEE
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