Instrumentation, measurement and control of bio process parameters ( Temperat...
Fasteners.pptx
1. What are Fasteners?
• Fasteners are several parts of any machine whether it is big or small.
These parts are joined in different ways according to their role and
position in a machine.
• Such holding devices as nuts, bolts, screws, keys, washers, rivets,
anchors, studs, inserts, rings, and pins are called fasteners. The
process of holding together the different parts of a machine is called
fastening. Fastening can be of three kinds.
Temporary fastening
Semi-permanent fastening
Permanent fastening
2. Form of Bolts
• Hexagonal-headed bolt
• Square-headed bolt
• Cylindrical or cheese-headed bolt
• Cup-headed or round-headed bolt
• T-headed bolt
• Countersunk-headed bolt
3. Hexagonal-headed bolt
• This is the most common form of a bolt and is used for general fasting
purposes. The hexagonal head is chamfered at its upper end.
4. Square-Headed Bolt
• This bolt is commonly used when the head is to be accommodated in
a recess. This recess is made of square shape so that the bolt is
prevented from turning when the nut is screwed on or off.
5. Cylindrical or Cheese-Headed Bol
• This type of bolt is used where projecting corners are unacceptable,
and where the space for arranging the bolt-head is relatively limited.
The rotation of the bolt is prevented by means of a pin inserted into
the shank just below the head.
6. Cup-Headed or Round-Headed Bolt
This bolt is used when projecting are undesirable and where better
appearance is required.
7. T-Headed Bolt
• This type of bolt is used for securing clamps, vices, and other
accessories to the tables of machine tools.
8. Countersunk-Headed Bolt
• This form of a bolt is used where the head of the bolt must not
project above the surface of the connection piece.