Engineered for critical connections, this M21 x 20mm Hex Head Cap Screw is precision-machined from Aerospace Grade Aluminum 6061. Offers superior strength-to-weight ratio for lightweight yet robust assemblies.
| Standard | DIN 933 |
| Material | Aluminum 6061 |
| Finish | Galvanized |
| Grade | N/A |
| Size | M21 |
| Length | 20mm |
| Head Width | 11mm |
Designed for demanding industrial environments, this M21 x 20mm Hex Head Cap Screw leverages the exceptional properties of Aluminum 6061, a precipitation-hardening alloy known for its moderate to high strength, excellent corrosion resistance, and good weldability. The M21 thread pitch ensures a secure and high-torque fastening solution, while the 20mm length provides ample grip for a variety of joint thicknesses. The 11mm hex head width is optimized for standard industrial tooling, facilitating efficient installation and disassembly in applications ranging from structural components in aerospace and automotive manufacturing to marine hardware and precision machinery.
This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.
1. Ensure mating surfaces are clean and free of debris. 2. Hand-thread the screw to engage the threads properly and prevent cross-threading. 3. Tighten the screw to the specified torque using a calibrated torque wrench, ensuring even pressure distribution.
| 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 |
| 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 | Excellent |
| Marine / Saltwater | Not Recommended |
| Chemical / Acidic | Not Recommended |
| ❌ Mistake | ✅ Correct Approach |
|---|---|
| Over-tightening the aluminum screw, leading to thread stripping or deformation. | Always use a calibrated torque wrench and adhere to recommended torque values for Aluminum 6061 fasteners to avoid damage. |
| Using the wrong size or type of tool on the hex head, causing cam-out and potential damage to the head. | Utilize a properly fitting socket or wrench for the 11mm hex head to ensure secure engagement and prevent slippage. |
A: This Hex Head Cap Screw, Aluminum 6061 is manufactured from Aluminum 6061.
A: Aerospace structural components, Automotive chassis and engine assemblies, Marine hardware and fittings, Precision machinery and tooling.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||