Rivets are used to join together two or more sheets of metal permanently. In sheet metal work riveting is done where: brazing is not suitable, the structure changes owing to welding heat, the distortion due to welding cannot be easily removed etc.
Specification of rivets
Rivets are specified by their length, material, size and shape of head.
Rivets are made of ductile materials like low carbon sheet (mild steel), brass, copper, yellow brass, aluminium are their alloys.
The length of the rivets ‘L” is indicated by the shank length.
Rivets are cylindrical rods having heads of various shapes.They are used for assembling the parts of a work-piece together.
Parts of Rivet
Shape of Rivet head
The shape of the rivet head is to be selected according to the intended use of the work-piece to be riveted.
Diameter of Rivet Head
The diameter is to be selected depending on the required strength.
Length of Rivet Head
Length is to be selected depending upon the thickness of the components to be riveted.
Types of Rivets and Use
- Snap Head Rivet
- Pan Head Rivet
- Conical Head Rivet
- Countersunk Head Rivet
- Bifurcated Rivet
1. Snap Head Rivet
Snap Head Rivet is the most commonly used form, and it gives a very strong joint.
2. Pan Head Rivet
Pan Head Rivet is used in heavy structural work where the strength of rivet
is very important.
3. Conical Head Rivet
It is generally used in light assembly where riveting is done by hand hammering.
4. Countersunk Head Rivet
It is used where projection of the rivet head is to be avoided.
5. Bifurcated rivet
The shape of the head is shown in the figure and the bifurcated portion is used for fastening light parts- tin plates, leather, plastics, etc.