This M21x33mm Hex Head Cap Screw, crafted from robust Aluminum 6061, offers superior corrosion resistance and a lightweight design. Ideal for applications requiring reliable joining without the weight penalty of steel.
| Standard | ASME B18 |
| Material | Aluminum 6061 |
| Finish | Black Oxide |
| Grade | N/A |
| Size | M21 |
| Length | 33mm |
| Head Width | 12mm |
Precision-manufactured to tight tolerances, this M21x33mm Hex Head Cap Screw features a nominal diameter of M21, a length of 33mm, and a head width of 12mm. Constructed from Aluminum 6061, it exhibits excellent strength-to-weight ratio, good machinability, and high resistance to atmospheric corrosion. This material makes it particularly suitable for marine, aerospace, and automotive environments where weight reduction and environmental resilience are critical. The hex head design ensures secure torque application with standard tooling.
This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.
1. Ensure the mating threaded hole is clean and free from debris. 2. Insert the screw and engage the threads by hand for at least two full turns to prevent cross-threading. 3. Tighten the screw using an appropriate hex wrench or socket, applying torque gradually to the specified value for Aluminum 6061 fasteners to avoid over-stressing the material.
| Standard System | Designation |
|---|---|
| ISO Equivalent | ISO 898-1 / ISO 4014 |
| DIN Equivalent | DIN 931 / DIN 933 |
| Primary Standard | ASME B18 |
| 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 Aluminum 6061 fasteners. | Utilize a torque wrench to adhere to recommended torque specifications for Aluminum 6061 to prevent stripping threads or deforming the material. |
| Using standard steel torque values. | Aluminum 6061 has a lower yield strength than steel; consult fastener torque charts specifically for aluminum alloys to ensure proper clamping force without damage. |
A: This Hex Head Cap Screw, Aluminum 6061 is manufactured from Aluminum 6061.
A: Aerospace structural components, Automotive lightweight assemblies, Marine hardware and fixtures.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||