CSK Screws
What are CSK Screws?
CSK (Countersunk) Screws feature a flat head that sits flush with or below the surface after installation, providing a smooth and clean finish. These screws are ideal for applications where appearance and precision alignment are important.
At Asiad Steel Industries, we manufacture and supply a wide range of CSK Screws designed for reliability, corrosion resistance, and easy installation across industrial, construction, and engineering applications.
Key Features
High
Grip
Durable
Construction
Easy Installation
& Removal
Wide
Compatibility
Corrosion
Resistant
Specifications
| Specification Category | Parameter / Feature | Details / Options |
|---|---|---|
| Size Range | Diameter (Metric / Imperial) | M2 to M24 / #2 to 1” |
| Length Range | 4 mm to 200 mm (custom lengths available) | |
| Thread Types | Metric | ISO Metric Coarse / Fine Threads |
| Imperial | UNC, UNF | |
| Head Type | Countersunk (Flat Head) | 90° angle for flush fit |
| Drive Types | Slotted, Philips, Hex Socket | Based on standard or custom design |
| Material Options | Stainless Steel | SS 304, SS 316, SS 316L |
| Carbon Steel | Grade 8.8, 10.9 | |
| Alloy Steel | Zinc or Black Oxide Finish | |
| Standards & Certifications | ISO / DIN / ANSI | DIN 963, DIN 965, DIN 7991, ISO 2009, ISO 10642 |
| ASTM / ASME | ASTM A193, ASME B18.3 | |
| Certifications | ISO 9001, CE, RoHS Compliant | |
| Surface Finish | Standard | Polished, Zinc Plated, Black Oxide |
| Optional | Hot Dip Galvanized, Nickel Plated, PTFE Coated |
Dimensions
| Screw Type | Diameter (d) | Thread Pitch (P) | Length (L) | Head Diameter (D) | Head Height (H) | Drive Type | Standards | Material Options | Approx. Weight per 100 pcs (kg) |
|---|---|---|---|---|---|---|---|---|---|
| CSK Slotted (DIN 963) | M2 – M24 | 0.4 – 3.0 mm | 4 – 200 mm | 1.8d – 2.0d | Flush (90°) | Slotted | DIN 963 / ISO 2009 | SS 304, CS | 0.05 – 45 |
| CSK Philips (DIN 965) | M2 – M12 | 0.4 – 1.75 mm | 4 – 100 mm | 1.8d – 2.0d | Flush (90°) | Philips Cross | DIN 965 / ISO 7046 | SS 304, CS | 0.05 – 12 |
| Allen CSK (DIN 7991) | M3 – M24 | 0.5 – 3.0 mm | 6 – 200 mm | 2.0d | Flush (90°) | Hex Socket | DIN 7991 / ISO 10642 | SS 304, SS 316, Alloy Steel | 0.08 – 40 |
Mechanical Properties
| Property | Value | Unit / Standard |
|---|---|---|
| Tensile Strength | 400 – 1100 | MPa |
| Yield Strength | 240 – 900 | MPa |
| Hardness | 120 – 340 | HB |
| Elongation | ≥ 12 – 25 | % |
| Density | 7.8 – 8.0 | g/cm³ |
| Impact Toughness | ≥ 27 – 80 | J |
| Modulus of Elasticity (E) | ~200 | GPa |
| Fatigue Strength | 150 – 400 | MPa |
| Corrosion Resistance | Moderate to Excellent | — |
| Thermal Conductivity | 15 – 55 | W/m·K |
| Coefficient of Thermal Expansion | 11 – 17 ×10⁻⁶ | /°C |
| Operating Temperature Range | -50 to 400 | °C |
Chemical Composition
| Element | SS 304 (%) | SS 304L (%) | SS 316 (%) | SS 316L (%) |
|---|---|---|---|---|
| Chromium (Cr) | 18.0 – 20.0 | 18.0 – 20.0 | 16.0 – 18.0 | 16.0 – 18.0 |
| Nickel (Ni) | 8.0 – 10.5 | 8.0 – 12.0 | 10.0 – 14.0 | 10.0 – 14.0 |
| Carbon (C) | ≤ 0.08 | ≤ 0.03 | ≤ 0.08 | ≤ 0.03 |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 | ≤ 2.00 | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 | ≤ 1.00 | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 | ≤ 0.045 | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 | ≤ 0.030 | ≤ 0.030 | ≤ 0.030 |
| Iron (Fe) | Balance | Balance | Balance | Balance |
| Molybdenum (Mo) | — | — | 2.0 – 3.0 | 2.0 – 3.0 |
Applications of CSK Screws
Construction &
Infrastructure
Automotive & Heavy
Equipment
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
What is a CSK Screw used for?
Are CSK Screws available in stainless steel?
What’s the difference between CSK Philips and CSK Allen Screws?
Do you provide custom lengths or finishes for CSK Screws?
