Engineered for demanding industrial environments, this M21x75mm hex head cap screw provides exceptional tensile strength and durability. Constructed from high-grade carbon steel for reliable load-bearing.
| Standard | ISO 9001 |
| Material | Carbon Steel |
| Finish | Passivated |
| Grade | N/A |
| Size | M21 |
| Length | 75mm |
| Head Width | 15mm |
Precision-manufactured to tight tolerances, this M21x75mm hex head cap screw is fabricated from robust carbon steel, offering superior shear and tensile strength for critical structural connections. The 15mm head width ensures effective torque transfer via standard hex tooling, facilitating secure and reliable assembly. Its standardized M21 thread pitch guarantees compatibility with a wide range of metric nuts and tapped holes. Ideal for heavy machinery, structural framing, and automotive applications where vibration resistance and long-term performance are paramount.
This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.
1. Select appropriate tooling (e.g., socket wrench) for the 15mm hex head. 2. Ensure mating threads are clean and free of debris. 3. Engage the cap screw fully and tighten to the specified torque value, ensuring secure fastening without over-stressing the material.
| 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 |
| Carbon (C) | 0.28 - 0.55% |
| Manganese (Mn) | 0.60 - 0.90% |
| Phosphorus (P) | 0.04% max |
| Sulfur (S) | 0.05% max |
| 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 |
|---|---|
| Using incorrect torque, leading to fastener failure or stripping. | Always consult engineering drawings or torque charts for the recommended torque specification for this M21x75mm carbon steel fastener. |
| Cross-threading the screw, damaging both the screw and the mating component. | Start threading the cap screw by hand to ensure proper alignment before applying any torque. |
A: This Hex Head Cap Screw, Carbon Steel is manufactured from Carbon Steel.
A: Heavy Machinery Assembly, Structural Steel Connections, Automotive Chassis 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. | ||||