Screws
What are Screws?
Screws are externally threaded fasteners designed to be inserted into materials using torque, often without needing a nut. Used for joining wood, metal, plastic, or composites, screws provide both clamping force and resistance to loosening due to their helical thread.
Asiad Steel Industries manufactures and supplies premium-quality screws designed for precision, durability, and reliable performance. Available in a variety of materials, sizes, and specifications, our screws are engineered to meet the fastening needs of industries
Key Features
High
Grip
Durable
Construction
Easy Installation
& Removal
Wide
Compatibility
Corrosion
Resistant
Types of Screws
Specifications
| Specification Category | Parameter / Feature | Details / Options |
|---|---|---|
| Size Range | Diameter (Metric / Imperial) | M2 to M36 / #2 to 1-1/2” |
| Length Range | 4 mm to 300 mm (custom sizes available) | |
| Thread Types | Metric | ISO Metric Coarse / Fine Threads |
| Imperial | UNC, UNF | |
| Screw Types | Allen Cap | Hex Socket Cap Screws |
| CSK | Countersunk Screws | |
| Allen CSK | Countersunk Hex Socket Screws | |
| CSK Philips | Cross Recessed Countersunk Screws | |
| Cheese Head Screw | Cylindrical head with deep drive slot | |
| Pan Philips | Pan Head with Philips drive | |
| Material Options | Stainless Steel | SS 304, SS 316, SS 316L |
| Carbon Steel | Grade 8.8, 10.9, 12.9 | |
| Alloy Steel | Black Oxide Finish, Zinc Plated | |
| Standards & Certifications | ISO / DIN / ANSI | ISO 4762, DIN 912, DIN 7991, DIN 7984, DIN 7985 |
| ASTM / ASME | ASTM A193, ASME B18.3 | |
| Certifications | ISO 9001, CE, RoHS Compliant | |
| Design Features | Head Styles | Allen (Hex Socket), CSK (Flat), Philips, Cheese Head, Pan Head |
| Drive Types | Hex Socket, Philips | |
| Thread Tolerance | As per ISO 965 / ANSI B1.1 | |
| Coating & Surface Finish | Standard Finishes | Plain, Black Oxide, Zinc Plated |
| Optional Coatings | Hot Dip Galvanized, Nickel Plated, PTFE | |
| Surface Finish | Polished, Passivated | |
| Testing & Inspection | Mechanical Testing | Tensile, Proof Load, Hardness |
| Non-Destructive Testing | Magnetic Particle (MPI), Dye Penetrant (DPT) |
Dimensional Standards ANSI B18.21
| Screw Type | Diameter (d) | Thread Pitch (P) | Length (L) | Head Diameter (D) | Head Height (H) | Drive Size | Drive Type | Standards | Material Options | Tolerance Class | Approx. Weight per 100 pcs (kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Allen Cap (DIN 912) | M3 – M36 | 0.5 – 4.0 mm | 6 – 300 mm | 5.5d – 6d | 0.6d – 0.7d | Hex Socket (1.5–14 mm) | Internal Hex | DIN 912 / ISO 4762 | SS 304, SS 316, CS, Alloy Steel | 6g | 0.1 – 65 |
| CSK (DIN 963) | M2 – M24 | 0.4 – 3.0 mm | 4 – 200 mm | 1.8d – 2.0d | Flush (90°) | Slot / Hex | Slotted | DIN 963 / ISO 2009 | SS 304, CS | 6g | 0.05 – 45 |
| Allen CSK (DIN 7991) | M3 – M24 | 0.5 – 3.0 mm | 6 – 200 mm | 2.0d | Flush (90°) | Hex Socket (2–10 mm) | Internal Hex | DIN 7991 / ISO 10642 | SS 304, SS 316, CS, Alloy Steel | 6g | 0.08 – 40 |
| CSK Philips (DIN 965) | M2 – M12 | 0.4 – 1.75 mm | 4 – 100 mm | 1.8d – 2.0d | Flush (90°) | PH0–PH4 | Philips Cross | DIN 965 / ISO 7046 | SS 304, CS | 6g | 0.05 – 12 |
| Cheese Head (DIN 7984) | M2 – M20 | 0.4 – 2.5 mm | 4 – 120 mm | 1.8d – 2.0d | 0.4d – 0.5d | Slot / Hex | Slotted / Hex | DIN 7984 / ISO 1207 | SS 304, CS | 6g | 0.06 – 30 |
| Pan Philips (DIN 7985) | M2 – M12 | 0.4 – 1.75 mm | 4 – 100 mm | 1.7d – 2.0d | 0.5d – 0.6d | PH0–PH4 | Philips Cross | DIN 7985 / ISO 7045 | SS 304, CS | 6g | 0.05 – 15 |
Mechanical Properties
| Property | Value | Unit / Standard |
|---|---|---|
| Tensile Strength | 400 – 1100 | MPa (depends on grade: MS, SS 304/316, Alloy Steel, High-Tensile) |
| Yield Strength | 240 – 900 | MPa |
| Hardness | 120 – 340 | HB (Brinell) |
| Elongation | ≥ 12 – 25 | % |
| Density | 7.8 – 8.0 | g/cm³ |
| Impact Toughness | ≥ 27 – 80 | J (Charpy, varies with grade) |
| Modulus of Elasticity (E) | ~200 | GPa |
| Fatigue Strength | 150 – 400 | MPa |
| Corrosion Resistance | Moderate to Excellent | (plated, galvanized, or SS grades) |
| Thermal Conductivity | 15 – 55 | W/m·K |
| Coefficient of Thermal Expansion | 11 – 17 ×10⁻⁶ | /°C |
| Yield Ratio (YS/UTS) | 0.55 – 0.75 | – |
| Poisson’s Ratio | 0.27 – 0.30 | – |
| Brinell Hardness Range | 120 – 340 | HB |
| Surface Finish | Zinc plated, Hot-dip galvanized, Black oxide, SS polished | – |
| Operating Temperature Range | -50 to 400 | °C (depends on material) |
| Standards Covered | DIN, ISO, ASTM, ASME, BS | – |
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 Screws
Construction &
Infrastructure
Automotive & Heavy
Equipment
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
What is the difference between a machine screw and a self-tapping screw?
Do you offer corrosion-resistant screw coatings?
Can screws be ordered in bulk or project-specific kits?
Do your screws meet international standards?
