This M21x105mm Hex Head Cap Screw, constructed from high-performance polycarbonate, offers exceptional impact resistance and dielectric strength. Its robust design ensures reliable fastening in demanding industrial applications.
| Standard | DIN 933 |
| Material | Polycarbonate |
| Finish | Black Oxide |
| Grade | N/A |
| Size | M21 |
| Length | 105mm |
| Head Width | 33mm |
A proven choice for industrial professionals, this M21x105mm Hex Head Cap Screw features a precisely machined M21 thread and a substantial 105mm length for secure engagement. Manufactured from advanced polycarbonate, it exhibits superior tensile strength, excellent chemical resistance, and inherent non-conductivity, making it ideal for environments where electrical insulation or resistance to corrosive agents is paramount. The 33mm head width ensures adequate torque transfer during installation and provides a stable bearing surface. Its lightweight nature further contributes to ease of handling and assembly in various industrial settings.
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 from debris. 2. Hand-thread the cap screw to engage initial threads, ensuring proper alignment. 3. Tighten using an appropriate wrench, applying gradual and even torque until the desired tightness is achieved. Avoid overtightening.
| 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 |
|---|---|
| Overtightening, which can lead to thread stripping or material deformation. | Use a torque wrench set to the manufacturer's recommended torque values for polycarbonate fasteners. Apply torque gradually. |
| Using the wrong tool size, potentially damaging the hex head. | Always use a wrench that precisely fits the 33mm head width to ensure proper engagement and prevent slippage. |
A: This Hex Head Cap Screw, Polycarbonate is manufactured from Polycarbonate.
A: Electrical enclosure assembly, Corrosive chemical processing equipment, Lightweight structural components.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||