This M21x65mm hex head cap screw, crafted from robust carbon steel, offers superior tensile strength and durability for critical industrial fastening applications.
| Standard | ASTM A106 |
| Material | Carbon Steel |
| Finish | Passivated |
| Grade | N/A |
| Size | M21 |
| Length | 65mm |
| Head Width | 9mm |
Built to exacting engineering tolerances, this M21x65mm hex head cap screw is manufactured from high-grade carbon steel, ensuring exceptional tensile and shear strength for demanding structural and mechanical assemblies. The M21 nominal diameter, combined with a 65mm nominal length and a 9mm hex head width, provides optimal torque transfer and secure fastening capabilities. Its robust material composition makes it resistant to deformation under significant load, suitable for applications subjected to vibration and stress. This fastener conforms to relevant industrial standards for quality and performance, guaranteeing reliability in harsh environments.
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 cap screw into the designated hole and engage the threads. 3. Tighten the cap screw to the recommended torque specification using an appropriate wrench.
| 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 |
| 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 |
|---|---|
| Over-tightening the screw, leading to thread stripping or fastener failure. | Always adhere to the manufacturer's recommended torque specifications for the specific application and material being fastened. |
| Using a screw of incorrect length or diameter for the application. | Verify that the M21x65mm dimensions are appropriate for the joint design and load requirements before installation. |
A: This Hex Head Cap Screw, Carbon Steel is manufactured from Carbon Steel.
A: Heavy machinery assembly, Structural steel construction, Automotive 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. | ||||