This M21x47mm Hex Head Cap Screw, crafted from high-performance polycarbonate, provides a robust, lightweight, and non-conductive fastening solution. Engineered for superior chemical resistance and electrical insulation.
| Standard | ISO 9001 |
| Material | Polycarbonate |
| Finish | Galvanized |
| Grade | N/A |
| Size | M21 |
| Length | 47mm |
| Head Width | 30mm |
Precision-manufactured to tight tolerances, this M21x47mm Hex Head Cap Screw features a nominal thread diameter of 21mm and a length of 47mm. The polycarbonate material offers exceptional dielectric strength, excellent resistance to a broad range of chemicals, and a high impact strength. With a head width of 30mm, it ensures secure torque application. Ideal for environments where corrosion, electrical conductivity, or weight are critical concerns, such as chemical processing equipment, electrical enclosures, and specialized instrumentation.
This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.
1. Ensure mating threads are clean and free of debris. 2. Hand-thread the screw to engage initial threads, verifying smooth engagement. 3. Tighten using a properly sized hex driver, applying torque incrementally and avoiding over-tightening to prevent material deformation.
| Standard System | Designation |
|---|---|
| ISO Equivalent | ISO 898-1 / ISO 4014 |
| DIN Equivalent | DIN 931 / DIN 933 |
| Primary Standard | ISO 9001 |
| 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 | Excellent |
| Marine / Saltwater | Not Recommended |
| Chemical / Acidic | Not Recommended |
| ❌ Mistake | ✅ Correct Approach |
|---|---|
| Over-tightening, leading to thread stripping or head cracking. | Use a torque wrench set to the recommended specification for polycarbonate fasteners. Avoid excessive force. |
| Using incompatible solvents or cleaning agents that can degrade polycarbonate. | Consult the material data sheet for recommended cleaning agents. Avoid aggressive solvents like acetone or strong acids. |
A: This Hex Head Cap Screw, Polycarbonate is manufactured from Polycarbonate.
A: Chemical Processing Equipment, Electrical Enclosures & Assemblies, Medical Devices & Instrumentation.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||