Allen CSK Screw
What are Allen CSK Screws
Allen CSK (Countersunk) screws are precision-engineered fasteners featuring a flat head with a hexagonal socket drive. Designed to sit flush with or below the surface of the material they’re installed into, these screws provide a neat, low-profile finish—ideal for applications where aesthetics and a snag-free surface are important.
Allen CSK screws are widely used in furniture, electronics, aerospace, and machine assemblies where flush-mounting and high-torque fastening are essential.
Key Features
- Flush Finish – The countersunk design ensures the screw head doesn’t protrude.
- Hex Socket Drive – Allows high torque transmission without damaging the screw.
- Strong Grip – Provides a secure and tamper-resistant connection.
- Material Flexibility – Available in stainless steel, carbon steel, and alloy steel.
- Corrosion Resistance – Coatings and stainless grades available for durability.
Specifications
Mechanical Properties
Chemical Composition
Equivalent Grades
Weight Chart
Specifications
| Parameter | Specification |
|---|---|
| Size Range | M3 to M24 |
| Head Type | Countersunk (Flat Head) |
| Drive Type | Hex Socket (Allen Key) |
| Thread Type | Metric Coarse, Fine |
| Material Options | Stainless Steel, Carbon Steel, Alloy Steel |
| Standards | DIN 7991, ISO 10642, ANSI B18.3 |
| Finishes Available | Zinc Plated, Black Oxide, Hot-Dip Galvanized, Plain |
| Property | Value |
|---|---|
| Tensile Strength | 800 – 1,200 MPa |
| Yield Strength | 600 – 1,000 MPa |
| Hardness | 22 – 35 HRC |
| Temp. Range | -50°C to 300°C (material-dependent) |
| Element | Percentage (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 18.0 – 20.0 |
| Nickel (Ni) | 8.0 – 10.5 |
| Iron (Fe) | Balance |
| Standard | Equivalent Grade |
|---|---|
| ASTM | A193 B8 (SS), A574 (Alloy) |
| DIN | 7991 |
| ISO | 10642 |
| JIS | B1176 |
| BS | 4168 |
| Screw Size (mm) | Length (mm) | Approx. Weight (kg/1000 pcs) |
|---|---|---|
| M4 | 12 | 1.10 |
| M5 | 16 | 1.75 |
| M6 | 20 | 3.20 |
| M8 | 25 | 6.10 |
| M10 | 30 | 9.50 |
| M12 | 40 | 14.20 |
Applications of Allen CSK Screws
Construction &
Infrastructure
Automotive & Heavy
Equipment
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
What does CSK mean in Allen CSK screws?
CSK stands for "Countersunk", referring to the screw head design that sits flush with the surface.
Are Allen CSK screws rust-resistant?
Yes, especially if made from stainless steel or coated with zinc or black oxide.
Where are Allen CSK screws commonly used?
They’re widely used in applications requiring a clean surface finish like furniture, electronics, and machines.
Do you offer custom lengths or coatings?
Yes, we can provide Allen CSK screws in custom sizes, materials, and surface finishes based on your project needs.
