Engineered for demanding environments, this M21x91mm polycarbonate hex head cap screw offers superior chemical resistance and electrical insulation. Its robust design ensures reliable fastening in corrosive and conductive applications.
| Standard | ASTM A106 |
| Material | Polycarbonate |
| Finish | Galvanized |
| Grade | N/A |
| Size | M21 |
| Length | 91mm |
| Head Width | 14mm |
Built to exacting engineering tolerances, this M21x91mm hex head cap screw is manufactured from high-performance polycarbonate. This thermoplastic polymer exhibits excellent impact strength, broad chemical resistance against acids, bases, and solvents, and superior dielectric properties, making it non-conductive and ideal for electrical insulation. The M21 thread standard ensures compatibility with standard metric nuts and tapped holes, while the 91mm length provides ample engagement. The 14mm head width allows for secure torque application with standard hex tools, minimizing risk of over-tightening and material damage.
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. Thread the M21x91mm polycarbonate hex head cap screw into the receiving component, applying steady, even torque. 3. Tighten to the recommended torque specification for polycarbonate fasteners to avoid stripping or cracking.
| Standard System | Designation |
|---|---|
| ISO Equivalent | ISO 898-1 / ISO 4014 |
| DIN Equivalent | DIN 931 / DIN 933 |
| Primary Standard | ASTM A106 |
| 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 the screw, leading to stripping or cracking the polycarbonate head. | Utilize a torque wrench set to the manufacturer's recommended torque value for polycarbonate fasteners to prevent overstressing the material. |
| Using incompatible tools that may damage the hex head profile. | Employ properly sized metric hex wrenches or sockets to engage the head fully and prevent slippage or deformation. |
A: This Hex Head Cap Screw, Polycarbonate is manufactured from Polycarbonate.
A: Electrical enclosures and equipment assembly, Chemical processing and laboratory fixtures, Corrosion-resistant 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. | ||||