CSK Phillips Screws
What are CSK Phillips Screws?
CSK Phillips Screws, also known as Countersunk Phillips Head Screws, feature a flat head with a Phillips (cross) drive. Designed to sit flush with the material surface, these screws are ideal for applications requiring a clean, smooth finish. The countersunk design ensures the screw head does not protrude, making it suitable for aesthetic and structural applications.
Asiad Steel Industries is a trusted manufacturer, supplier, and exporter of premium-quality CSK Phillips Screws in various sizes, materials, grades, and finishes, offering reliable fastening solutions across global industries.
Key Features
High
Grip
Durable
Construction
Easy Installation
& Removal
Wide
Compatibility
Corrosion
Resistant
Specifications
| Specification Category | Parameter / Feature | Details / Options |
|---|---|---|
| Size Range | Nominal Size | M3 to M36 (custom sizes available) |
| Pressure Ratings | ANSI / ASME Class | Class 150, 300, 600, 900, 1500, 2500 (when used in pressure-retaining assemblies) |
| PN Ratings | PN6, PN10, PN16, PN25, PN40, PN64 | |
| Product Types | CSK Screws Variants | Countersunk Phillips Head Screws, Flat Head Phillips Screws |
| Head Angle | Standard | 90° (82° & 100° available on request) |
| Thread Types | Available Threads | Metric Coarse, Metric Fine, UNC, UNF |
| Material Options | Carbon Steel | Grades 8.8, 10.9, 12.9 |
| Stainless Steel | A2-70, A4-70, A4-80 | |
| Standards & Certifications | ASTM | ASTM F835, ASTM F912 |
| ASME / ANSI | ASME B18.3 | |
| ISO / DIN | ISO 10642, DIN 7991 | |
| Certifications | Compliance | ISO 9001, PED 2014/68/EU, NACE MR0175, RoHS, CE |
| Design Features | Head Type | Flat / Countersunk with Phillips drive |
| Drive Type | Phillips | |
| Tolerance | As per ISO 4759 / ASME B18.3 | |
| Thread Fit | 6g / UNC-2A, UNF-2A | |
| Coating & Surface Finish | Anti-Corrosion Coating | Zinc Plated, Black Oxide, Hot Dip Galvanized |
| Optional Coatings | PTFE, Geomet, Dacromet, Anodized (for Aluminium/Titanium) | |
| Surface Finish | Polished, Self-Colored, Passivated | |
| Testing & Inspection | Mechanical Testing | Tensile, Proof Load, Hardness, Wedge Tensile |
| Non-Destructive Testing | Magnetic Particle (MPI), Dye Penetrant (DPT), Ultrasonic (UT) | |
| Dimensional Inspection | GO/NO-GO Gauges, Micrometer Verification |
Dimensions
| Nominal Diameter (d) | Thread Pitch (mm) | Head Diameter (dk) (mm) | Head Height (k) (mm) | Recess Width (n) (mm) | Recess Depth (t) (mm) | Standard Thread Length (b) (mm) |
|---|---|---|---|---|---|---|
| M2 | 0.40 | 4.0 | 1.2 | 1.2 | 0.6 | 6–12 |
| M2.5 | 0.45 | 5.0 | 1.5 | 1.6 | 0.8 | 8–16 |
| M3 | 0.50 | 6.0 | 1.7 | 2.0 | 1.0 | 10–18 |
| M4 | 0.70 | 8.0 | 2.3 | 2.5 | 1.2 | 12–22 |
| M5 | 0.80 | 9.5 | 2.8 | 3.0 | 1.6 | 14–25 |
| M6 | 1.00 | 11.5 | 3.3 | 3.5 | 2.0 | 16–28 |
| M8 | 1.25 | 15.0 | 4.4 | 4.5 | 2.5 | 20–32 |
| M10 | 1.50 | 18.0 | 5.0 | 5.5 | 3.0 | 24–36 |
| M12 | 1.75 | 22.0 | 6.0 | 6.5 | 3.5 | 28–40 |
| M16 | 2.00 | 29.0 | 8.0 | 8.0 | 4.5 | 36–48 |
| M20 | 2.50 | 36.0 | 10.0 | 10.0 | 5.5 | 44–56 |
Mechanical Properties
| Property | Value | Unit / Standard |
|---|---|---|
| Tensile Strength | 400 – 1200 | MPa (depending on material & grade) |
| Yield Strength | 200 – 1000 | MPa |
| Hardness | 120 – 420 | HB / HRC (Brinell / Rockwell, grade-dependent) |
| Elongation | ≥ 10 – 25 | % |
| Density | 7.8 – 8.0 | g/cm³ (Carbon & Alloy Steel), 7.9 |
| Impact Toughness | ≥ 20 – 70 | J (Charpy, grade-dependent) |
| Modulus of Elasticity (E) | ~200 | GPa |
| Fatigue Strength | 200 – 500 | MPa |
| Corrosion Resistance | Moderate to Excellent | SS > CS > Alloy Steel |
| Thermal Conductivity | 15 – 50 | W/m·K |
| Coefficient of Thermal Expansion | 11 – 17 ×10⁻⁶ | /°C |
| Yield Ratio (YS/UTS) | 0.40 – 0.85 | – |
| Poisson’s Ratio | 0.27 – 0.30 | – |
| Brinell Hardness Range | 120 – 420 | HB / HRC |
| Surface Finish | Smooth / Polished / Coated | Zinc Plated, Black Oxide, Galvanized |
| Operating Temperature Range | -40 to 400 | °C (depending on material & coating) |
| Pressure Rating | Class 150, 300, 600, 900, 1500, 2500 | ASME B18.3 / ISO Standards |
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 Philips 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 Phillips Screw used for?
What materials are available for CSK screws?
Are these suitable for outdoor use?
Can I get custom lengths or coatings?
