fasteners

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.

9. Special Purpose Bolts

10. Nuts

11. Screws

12. Washer

13. Stud

14. Rivets

15. Nails