Countersunk Blind Rivet

Countersunk blind rivets are a fastening element for joining thin sheet metal parts. Their distinctive feature is flush installation with the metal surface: thanks to the head shape, they fully recess into a pre-drilled hole countersunk at 120 degrees. This provides a joint that is invisible from the outside and expands the range of applications for rivets.

This type of fastener is in demand across various branches of mechanical engineering.

Design features

Blind rivets are a smooth cylindrical shank with a head that undergoes plastic deformation to form a permanent joint. The product consists of two elements: the body (sleeve) and the shank (mandrel). The body is installed into a pre-prepared hole in the material; during installation, the mandrel is pulled through the rivet body using a special tool — a rivet gun — and the remaining part of the mandrel is automatically snapped off. The tool allows the fastener to be installed even when only single-sided access is available.

Depending on the material used, several rivet variants are distinguished:

• Steel. Both parts of the product are made of carbon steel St, providing a reliable connection of materials.
• Aluminium. Aluminium or its alloy with magnesium is used for manufacturing; non-ferrous metals are not subject to corrosion and can be used in highly reactive environments.
• Combined. The body is made of steel, the mandrel of non-ferrous metal. As a result, the joint combines high strength with corrosion resistance. The body can additionally be fitted with a zinc or other protective coating.

Blind rivets can be used as an alternative to welding: they create a permanent joint with a long service life. Installation can be carried out by one person and does not take much time. Thanks to this, this type of fastener is widely used across various industries.

Application options

Countersunk blind rivets are used in mechanical engineering: in the automotive industry, machine tool building, production of special equipment, machinery and various instruments. They are used to fasten panels to frames, and the countersunk head shape provides an aesthetic appearance for the finished joint. The joint becomes resistant to external influences and withstands dynamic loads and vibration.

Rivets are also used in construction, furniture manufacturing and other fields. The protective coating ensures a long service life and reliability of the joint.

FLOK supplies blind rivets with a countersunk head in a wide size range, including wholesale lots.

Size d dk K d1 L1 Tensile strength N Shear strength N
2.4	2.4 +0.08-0.10	5.0 -0.4	0.9	1.40	27	355	315
3.0	3.0 +0.08-0.10	6.0 -0.4	0.9	1.75	27	810	620
3.2	3.2 +0.08-0.10	6.0 -0.4	0.9	1.95	27	980	760
4.0	4.0 +0.08-0.15	7.5 -0.5	1.0	2.10	27	1600	1200
4.8	4.8 +0.08-0.15	9.0 -0.5	1.2	2.70	27	2230	1690
5.0	5.0 +0.08-0.15	9.0 -0.5	1.2	2.70	27	2500	2000

Size Thickness of materials being joined Head diameter Hole diameter
2.4×6	1.5 - 4.0	5.0	2.5 - 2.6
2.4×8	4.0 - 6.0
2.4×10	6.0 - 8.0
3.0 x 6	1.5 - 3.5	6.0	3.1 - 3.2
3.0 x 8	3.5 - 5.5
3.0 x 10	5.5 - 7.0
3.0 x 12	7.0 - 9.0
3.0 x 14	9.0 - 12.0
3.2 x 6	1.5 - 3.5	6.0	3.3 - 3.4
3.2 x 8	3.5 - 5.0
3.2 x 10	5.0 - 7.0
3.2 x 12	7.0 - 9.0
3.2 x 14	9.0 - 10.5
3.2 x 16	10.5 - 13.0
4.0 x 6	1.5 - 3.0	7.5	4.1 - 4.2
4.0 x 8	3.0 - 5.0
4.0 x 10	5.0 - 6.5
4.0 x 12	6.5 - 8.5
4.0 x 14	8.5 - 10.5
4.0 x 16	10.5 - 12.5
4.8 x 6	1.0 - 3.5	9.0	4.9 - 5.0
4.8 x 8	2.0 - 4.5
4.8 x 10	4.5 - 6.0
4.8 x 12	6.0 - 8.0
4.8 x 14	8.0 - 10.0
4.8 x 16	10.0 - 12.0
5.0 x 8	2.5 - 4.5	9.0	5.1 - 5.2
5.0 x 10	4.5 - 6.0
5.0 x 12	6.0 - 8.0
5.0 x 14	8.0 - 10.0
5.0 x 16	10.0 - 12.0