Stainless Steel Countersunk Head Rivet - Grade 202, 304, 316, A2, A2-70

CSK stands for Countersunk Head. These rivets have a 120°‑90° taper and sit flush with the surface, leaving no protruding head. This provides a smooth, safe finish ideal for layered assemblies or aerodynamic surfaces

Countersunk Head Rivet / CSK Head Rivets – Technical Specifications

Here is a detailed technical specification for CSK (Countersunk) Head Rivets, focusing on the most commonly used blind (pop) rivets and solid rivets:

Rivet Diameter (D)	Head Diameter (dk)	Head Height (k)	Recommended Hole (d₀)	Grip Range
2.4 mm (3/32")	4.8 – 5.0 mm	0.6 – 0.8 mm	2.5 – 2.6 mm	0.5 – 3.2 mm
3.2 mm (1/8")	6.5 – 6.8 mm	0.8 – 1.0 mm	3.3 – 3.4 mm	0.5 – 6.4 mm
4.0 mm (5/32")	7.8 – 8.0 mm	1.0 – 1.2 mm	4.1 – 4.2 mm	1.0 – 9.5 mm
4.8 mm (3/16")	9.2 – 9.5 mm	1.2 – 1.4 mm	4.9 – 5.0 mm	1.6 – 12.7 mm
6.4 mm (1/4")	12.5 – 13.0 mm	1.5 – 1.8 mm	6.5 – 6.6 mm	3.2 – 19.0 mm

Head Type : CSK (Countersunk Head) – Typically 90° or 120° taper
Head Angle : 90°, 100°, 120° (standard varies by application)
Shank Type : Plain cylindrical shank
Installation Type : Blind (Pop Rivet) or Solid Rivet
Material Types : Aluminum, Stainless Steel (A2/A4), Steel, Copper, Brass
Finish/Coating : Zinc Plated, Anodized, Plain, Nickel-Plated

CSK Head Solid Rivets

Diameter (D)	Head Diameter (dk)	Head Height (k)	Head Angle	Length Range (L)
3 mm	6 mm	1 mm	120°	6 mm – 50 mm
4 mm	8 mm	1.2 mm	120°	8 mm – 50 mm
5 mm	10 mm	1.5 mm	120°	10 mm – 60 mm
6 mm	12 mm	1.8 mm	120°	12 mm – 80 mm

Mechanical Properties

Material	Tensile Strength	Shear Strength	Temp. Resistance
Aluminum 5052	~150 MPa	~100 MPa	Up to 100°C
Stainless Steel A2	~500–600 MPa	~400 MPa	Up to 300°C
Mild Steel	~400 MPa	~300 MPa	Up to 250°C
Brass	~300 MPa	~200 MPa	Up to 200°C

CSK head rivets, or countersunk head rivets, are specifically crafted to seamlessly blend with the surface of the materials they are binding together. This results in a polished and neat appearance.

Head Type

90° or 120° taper

Diameter (D)

6 mm to 12mm

Head Angle

120°

Tensile Strength

~500–600 MPa

Countersunk Head

The head of the rivet has a conical shape, enabling it to fit snugly in a countersunk hole and create a smooth surface.

Flush Finish

This design is perfect for situations that call for a seamless appearance or a sleek finish, as it eliminates any bumps or protrusions.

Blind Rivets

Multiple CSK head rivets are considered blind, enabling installation from a single side of the material. This quality makes them ideal for use in situations where accessibility to both sides is restricted.

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