This M21 x 28mm hex head cap screw is precision-engineered from high-performance polycarbonate. Offering exceptional strength-to-weight ratio and superior chemical resistance, it's ideal for environments where traditional metal fasteners fail.
| Standard | DIN 933 |
| Material | Polycarbonate |
| Finish | Plain |
| Grade | N/A |
| Size | M21 |
| Length | 28mm |
| Head Width | 27mm |
Manufactured under strict quality controls, this M21 x 28mm hex head cap screw features a 27mm head width. Constructed from advanced polycarbonate, it exhibits excellent dielectric properties, high impact strength, and remarkable resistance to a wide range of acids, alkalis, and solvents. Its lightweight nature simplifies handling and reduces overall assembly weight, making it suitable for applications in chemical processing, electronics, and marine environments where corrosion is a critical concern.
This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.
1. Select the appropriate mating component with a pre-tapped M21 thread or a clearance hole for a nut. 2. Insert the polycarbonate hex head cap screw, ensuring full thread engagement. 3. Tighten using a standard socket wrench to the recommended torque specification, avoiding overtightening to prevent material deformation.
| 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 the polycarbonate screw, leading to thread stripping or head cracking. | Use a torque wrench and adhere to the specified torque limits for polycarbonate fasteners to prevent damage. |
| Using in applications exceeding the maximum operating temperature range of polycarbonate. | Verify the operational temperature requirements and ensure they fall within the known capabilities of polycarbonate materials for long-term integrity. |
A: This Hex Head Cap Screw, Polycarbonate is manufactured from Polycarbonate.
A: Chemical processing equipment, Electrical enclosure assemblies, Marine and offshore hardware, Lightweight structural components, Medical device manufacturing.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||