This M21x74mm hex head cap screw, crafted from robust carbon steel, offers superior tensile strength and reliability for critical industrial assemblies requiring precise load bearing.
| Standard | DIN 933 |
| Material | Carbon Steel |
| Finish | Passivated |
| Grade | N/A |
| Size | M21 |
| Length | 74mm |
| Head Width | 20mm |
Precision-manufactured to tight tolerances, this M21x74mm carbon steel hex head cap screw features a nominal diameter of M21 and a functional length of 74mm. The hex head, with a width across flats of 20mm, is designed for optimal torque application using standard tooling. Constructed from high-grade carbon steel, it exhibits excellent tensile strength and hardness, making it suitable for applications subject to significant mechanical stress and vibration. The material's inherent toughness ensures reliable performance in demanding environments, resisting deformation and fracture under heavy loads.
This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.
1. Ensure the mating threads are clean and free of debris. 2. Insert the hex head cap screw into the designated threaded hole or nut. 3. Tighten the screw to the specified torque using an appropriate wrench, ensuring consistent pressure.
| 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 |
| 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 the wrong size wrench, leading to head stripping. | Always use a wrench that properly fits the 20mm hex head to avoid damage and ensure correct torque application. |
| Over-tightening, causing thread damage or screw fracture. | Adhere to the recommended torque specifications for the application to prevent material fatigue and premature failure. |
A: This Hex Head Cap Screw, Carbon Steel is manufactured from Carbon Steel.
A: Structural steel connections, Heavy machinery assembly, Automotive and aerospace frameworks.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||