Engineered for demanding environments, this M21 x 145mm Hex Head Cap Screw offers superior chemical resistance and non-conductivity. Its polycarbonate construction ensures lightweight strength and excellent impact absorption for critical fastening applications.
| Standard | ASTM A106 |
| Material | Polycarbonate |
| Finish | Black Oxide |
| Grade | N/A |
| Size | M21 |
| Length | 145mm |
| Head Width | 25mm |
Specified by design engineers worldwide, this M21 x 145mm Polycarbonate Hex Head Cap Screw features a nominal diameter of 21mm and a total length of 145mm, with a head width of 25mm. Manufactured from high-performance polycarbonate, it exhibits exceptional dielectric strength, excellent UV resistance, and superior corrosion resistance compared to metallic fasteners. Its thermoplastic nature allows for vibration dampening and a wide operating temperature range, making it ideal for applications where electrical insulation or non-sparking properties are paramount. Conforms to relevant ISO fastening standards.
This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.
1. Select appropriate tooling, ensuring compatibility with the hex head dimensions. 2. Align the screw with the pre-tapped hole or mating component, ensuring straight thread engagement. 3. Apply consistent, controlled torque to secure the assembly, avoiding over-tightening which can damage the polycarbonate material.
| Standard System | Designation |
|---|---|
| ISO Equivalent | ISO 898-1 / ISO 4014 |
| DIN Equivalent | DIN 931 / DIN 933 |
| Primary Standard | ASTM A106 |
| Tensile Strength | Standard Commercial Spec |
| Yield Strength | Standard Commercial Spec |
| Hardness | Varies by specific batch |
| Bolt Size | Dry Torque (ft-lbs) | Lubricated Torque (ft-lbs) |
|---|---|---|
| M21 | Check Calculator | Reduce by 25% |
| Size / Type | Est. Weight (lbs/100) | Shipping Weight (kg) |
|---|---|---|
| M21 | Varies by dimension | Contact Sales |
| Environment | Rating |
|---|---|
| Indoor / Dry | Excellent |
| Outdoor / Exposed | Moderate |
| Marine / Saltwater | Not Recommended |
| Chemical / Acidic | Not Recommended |
| ❌ Mistake | ✅ Correct Approach |
|---|---|
| Over-tightening the screw, leading to material deformation or cracking. | Use a torque wrench set to the manufacturer's recommended specification or consult design documentation for the appropriate torque value. |
| Using metallic tools that can scratch or damage the polycarbonate surface. | Employ tools made from softer materials or ensure proper technique to prevent surface damage. |
A: This Hex Head Cap Screw, Polycarbonate is manufactured from Polycarbonate.
A: Electrical enclosures and control panels, Medical equipment assemblies, Corrosion-prone environments (e.g., chemical processing).
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||