This M21x89mm Hex Head Cap Screw, crafted from high-performance polycarbonate, offers exceptional corrosion resistance and electrical insulation. Designed for reliable fastening in challenging environments.
| Standard | DIN 933 |
| Material | Polycarbonate |
| Finish | Plain |
| Grade | N/A |
| Size | M21 |
| Length | 89mm |
| Head Width | 24mm |
Built to exacting engineering tolerances, this M21x89mm polycarbonate hex head cap screw features a nominal diameter of 21mm and a thread length of 89mm, with a head width of 24mm. The advanced polycarbonate material provides superior resistance to a wide range of chemicals, solvents, and UV degradation, making it ideal for corrosive atmospheres and outdoor applications. Its excellent dielectric strength ensures safe use in electrical assemblies, while its lightweight yet robust construction offers a reliable alternative to metal fasteners in weight-sensitive designs.
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 threads properly. 3. Tighten using a standard hex wrench to the recommended torque specification for polycarbonate fasteners, avoiding over-tightening.
| Standard System | Designation |
|---|---|
| ISO Equivalent | ISO 898-1 / ISO 4014 |
| DIN Equivalent | DIN 931 / DIN 933 |
| Primary Standard | DIN 933 |
| 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 polycarbonate screw. | Utilize a torque wrench set to the appropriate low torque value for plastic fasteners to prevent stripping or cracking. |
| Using in applications with extreme impact or shear forces. | Evaluate load requirements and consider if polycarbonate's mechanical properties are sufficient, or opt for a higher-strength material if necessary. |
A: This Hex Head Cap Screw, Polycarbonate is manufactured from Polycarbonate.
A: Chemical processing equipment, Marine and offshore environments, Electrical enclosures and assemblies.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||