Engineered for demanding environments, this M21x71mm hex head cap screw offers exceptional strength and chemical resistance. Its polycarbonate composition ensures non-conductivity and durability.
| Standard | ASME B18 |
| Material | Polycarbonate |
| Finish | Plain |
| Grade | N/A |
| Size | M21 |
| Length | 71mm |
| Head Width | 11mm |
Purpose-built for heavy-duty applications, this M21x71mm hex head cap screw features a robust polycarbonate construction. With a head width of 11mm, it provides superior torque transfer and resistance to corrosive chemicals and electrical currents. Its high impact strength and temperature stability make it suitable for extreme operational conditions where metal fasteners might fail or introduce conductivity risks. This screw is designed for secure fastening in industrial machinery, marine equipment, and environments requiring non-sparking components.
This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.
1. Ensure the mating threads are clean and free from debris. 2. Hand-thread the cap screw into the receiving component to avoid cross-threading. 3. Use an appropriate wrench or socket to tighten the screw to the specified torque, avoiding overtightening which can damage the polycarbonate.
| Standard System | Designation |
|---|---|
| ISO Equivalent | ISO 898-1 / ISO 4014 |
| DIN Equivalent | DIN 931 / DIN 933 |
| Primary Standard | ASME B18 |
| 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 |
|---|---|
| Overtightening the polycarbonate screw | Use a torque wrench set to the manufacturer's recommended torque value to prevent stripping threads or cracking the screw head. |
| Using metal tools that can damage the polycarbonate head | Employ non-marring tools or ensure a proper socket fit to prevent scratching or deforming the hex head. |
A: This Hex Head Cap Screw, Polycarbonate is manufactured from Polycarbonate.
A: Chemical processing equipment, Marine and offshore installations, Electrical enclosures and insulation.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||