Engineered for demanding applications, this M21 x 69mm Hex Cap Screw features superior corrosion resistance and a lightweight profile, leveraging the strength of Aluminum 6061.
| Standard | ASME B18 |
| Material | Aluminum 6061 |
| Finish | Plain |
| Grade | N/A |
| Size | M21 |
| Length | 69mm |
| Head Width | 21mm |
Manufactured under strict quality controls, this M21 x 69mm Hex Head Cap Screw is precisely machined from premium Aluminum 6061 alloy. This material offers an excellent balance of strength, lightness, and exceptional corrosion resistance, making it ideal for environments prone to oxidation. The M21 nominal diameter and 69mm nominal length, coupled with a 21mm head width, ensure robust and secure fastening in a wide range of structural and mechanical assemblies. Its low density minimizes overall component weight, a critical factor in aerospace, automotive, and marine industries.
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 from debris. 2. Hand-thread the screw to confirm proper engagement and alignment. 3. Torque the screw to the manufacturer's recommended specification using a calibrated torque wrench, ensuring the head is seated flush against the mating surface.
| 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-torquing the aluminum screw. | Always use a calibrated torque wrench and adhere to the specified torque values for Aluminum 6061 fasteners to prevent thread stripping or material deformation. |
| Using dissimilar metals in corrosive environments without proper isolation. | When joining Aluminum 6061 to other metals, consider using dielectric grease or isolating washers to prevent galvanic corrosion. |
A: This Hex Head Cap Screw, Aluminum 6061 is manufactured from Aluminum 6061.
A: Aerospace structural components, Automotive chassis and body assembly, Marine hardware and fittings, Lightweight industrial machinery.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||