This M21 x 59mm Hex Head Cap Screw, crafted from Aluminum 6061, offers superior corrosion resistance and excellent strength-to-weight ratio. Engineered for reliable, lightweight fastening solutions.
| Standard | ASME B18 |
| Material | Aluminum 6061 |
| Finish | Black Oxide |
| Grade | N/A |
| Size | M21 |
| Length | 59mm |
| Head Width | 8mm |
Built to exacting engineering tolerances, this M21 x 59mm Hex Head Cap Screw is manufactured from Aerospace Grade Aluminum 6061-T6. This alloy provides a remarkable combination of strength, ductility, and corrosion resistance, making it ideal for applications where weight reduction is critical without compromising structural integrity. The precise M21 thread pitch and 59mm length, coupled with a nominal head width of 8mm, ensure secure and consistent engagement in demanding environments, from automotive and aerospace assemblies to marine hardware and custom fabrication projects requiring non-magnetic properties.
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 cap screw by hand to verify alignment and prevent cross-threading. 3. Tighten to the specified torque using an appropriate hex driver, avoiding over-tightening to prevent thread stripping or material deformation.
| 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 |
|---|---|
| Using excessive force leading to stripped threads. | Always adhere to the recommended torque specifications for Aluminum 6061 fasteners and use calibrated torque wrenches. |
| Not verifying compatibility of mating materials. | Ensure the mating component is designed to accommodate the thread pitch and material properties of Aluminum 6061 to prevent galvanic corrosion or premature failure. |
A: This Hex Head Cap Screw, Aluminum 6061 is manufactured from Aluminum 6061.
A: Aerospace structural components, Automotive lightweighting, Marine hardware and fittings, Custom fabrication and prototyping.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||