Engineered for demanding environments, this M21x39mm Polycarbonate Hex Head Cap Screw offers exceptional strength and corrosion resistance. Its lightweight design makes it ideal for applications where weight and chemical inertness are critical.
| Standard | ISO 9001 |
| Material | Polycarbonate |
| Finish | Anodized |
| Grade | N/A |
| Size | M21 |
| Length | 39mm |
| Head Width | 14mm |
Purpose-built for heavy-duty applications, this M21x39mm Hex Head Cap Screw leverages the superior properties of polycarbonate. With a head width of 14mm, it provides robust clamping force while maintaining excellent impact resistance and a high tensile strength-to-weight ratio. Polycarbonate's inherent dielectric strength makes it suitable for electrical applications, and its resistance to a wide range of chemicals and solvents ensures long-term performance in corrosive environments. Ideal for structural assemblies, machine building, and applications requiring non-metallic fastening solutions.
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 cap screw to the desired initial engagement. 3. Use an appropriate wrench or socket to tighten the cap screw to the specified torque, avoiding over-tightening.
| 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 | Moderate |
| Marine / Saltwater | Not Recommended |
| Chemical / Acidic | Not Recommended |
| ❌ Mistake | ✅ Correct Approach |
|---|---|
| Over-tightening the polycarbonate screw, leading to thread stripping or material deformation. | Always adhere to recommended torque specifications for polycarbonate fasteners. If unsure, start with a lower torque and incrementally increase while monitoring for signs of stress. |
| Using metal tools that can scratch or damage the polycarbonate surface, compromising its aesthetic or protective qualities. | Utilize non-marring tools or apply protective tape to the tool head when tightening to prevent surface damage. |
A: This Hex Head Cap Screw, Polycarbonate is manufactured from Polycarbonate.
A: Chemical processing equipment, Electrical enclosures and busbars, Marine and offshore structures.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||