Allen Cap Screws
What are Allen Cap Screws
Allen Cap Screws, also known as socket head cap screws, are high-strength fasteners designed with a cylindrical head and internal hex drive. These screws are tightened using an Allen (hex) key, allowing for a secure and flush fit even in tight or recessed spaces. Their clean, compact design makes them ideal for machinery, automotive, electronics, and structural applications requiring precision and aesthetics.
Allen Cap Screws are widely used in high-torque and high-performance environments due to their superior clamping force and space-efficient profile.
Key Features
- Hex Drive Design – Enables torque transfer in limited spaces
- High Strength – Suitable for load-bearing assemblies
- Clean Appearance – Ideal for exposed and aesthetic applications
- Material Versatility – Available in stainless steel, alloy steel, and carbon steel
- Custom Sizes – Wide range of lengths, threads, and diameters
Specifications
Mechanical Properties
Chemical Composition
Equivalent Grades
Weight Chart
Specifications
| Parameter | Specification |
|---|---|
| Size Range | M3 to M48 |
| Thread Type | Metric, UNC, UNF |
| Head Style | Cylindrical Head |
| Drive Type | Internal Hex (Allen) |
| Material Options | Stainless Steel, Alloy Steel, Carbon Steel |
| Standards | DIN 912, ISO 4762, ASTM A574, ASME B18.3 |
| Finishes Available | Zinc Plated, Black Oxide, Plain, Hot-Dip Galvanized |
| Property | Value |
|---|---|
| Tensile Strength | 800 – 1200 MPa (material-dependent) |
| Hardness | 20 – 45 HRC |
| Shear Strength | Up to 70% of tensile strength |
| Operating Temp. | -50°C to 300°C |
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.15 – 0.50 |
| Manganese (Mn) | 0.60 – 1.20 |
| Silicon (Si) | 0.10 – 0.35 |
| Chromium (Cr)* | 16.00 – 18.00 (SS grades) |
| Nickel (Ni)* | 8.00 – 10.00 (SS grades) |
| Iron (Fe) | Balance |
| Standard | Equivalent Grade |
|---|---|
| ASTM | A574 (Alloy Steel), A193 B8 (SS) |
| DIN | 912 |
| ISO | 4762 |
| JIS | B1176 |
| BS | 2470 |
| Screw Size (mm) | Length (mm) | Approx. Weight (kg/1000 pcs) |
|---|---|---|
| M6 | 20 | 4.80 |
| M8 | 25 | 8.20 |
| M10 | 30 | 13.10 |
| M12 | 35 | 19.70 |
| M16 | 40 | 35.60 |
| M20 | 50 | 57.80 |
Applications of Allen Cap Screws
Construction &
Infrastructure
Automotive & Heavy
Equipment
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
Why are Allen Cap Screws preferred in machinery?
Because of their high strength and compact head design, Allen Cap Screws are ideal for precise fits in machinery and equipment with limited access.
Are stainless steel Allen Cap Screws rust-resistant?
Yes, stainless steel variants offer excellent corrosion resistance for both indoor and outdoor applications.
Can Allen Cap Screws be reused?
Yes, if not overtightened or damaged, they can be reused in most non-critical applications.
Do you offer custom threads or lengths?
Absolutely. We provide Allen Cap Screws in custom thread types, lengths, and coatings based on your project requirements.
