Engineered for superior performance, this M4 x 21mm brass hex head cap screw provides robust fastening with excellent corrosion resistance. Its precise dimensions ensure reliable assembly in a variety of applications.
| Standard | ASME B18 |
| Material | Brass |
| Finish | Galvanized |
| Grade | N/A |
| Size | M4 |
| Length | 21mm |
| Head Width | 20mm |
Built to exacting engineering tolerances, this M4 x 21mm brass hex head cap screw offers exceptional dimensional stability and consistent performance. Crafted from high-grade brass, it exhibits superior corrosion resistance, non-magnetic properties, and excellent electrical conductivity, making it ideal for environments where rust and interference are critical concerns. The M4 thread size ensures compatibility with standard metric components, while the 21mm length provides ample engagement for secure joining. The broad 20mm head width distributes load effectively and allows for easy torque application with standard hex tools.
This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.
1. Select the appropriate hex wrench for the M4 screw head. 2. Align the screw with the pre-tapped hole or nut. 3. Gradually tighten the screw, applying consistent torque to secure the components without over-stressing the material. 4. Ensure the desired clamping force is achieved without stripping threads or damaging the workpiece.
| 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 |
| Copper (Cu) | 60.0 - 63.0% |
| Zinc (Zn) | Balance |
| Lead (Pb) | 2.5 - 3.7% |
| Bolt Size | Dry Torque (ft-lbs) | Lubricated Torque (ft-lbs) |
|---|---|---|
| M4 | Check Calculator | Reduce by 25% |
| Size / Type | Est. Weight (lbs/100) | Shipping Weight (kg) |
|---|---|---|
| M4 | Varies by dimension | Contact Sales |
| Environment | Rating |
|---|---|
| Indoor / Dry | Excellent |
| Outdoor / Exposed | Excellent |
| Marine / Saltwater | Not Recommended |
| Chemical / Acidic | Not Recommended |
| ❌ Mistake | ✅ Correct Approach |
|---|---|
| Using the wrong size hex wrench, leading to cam-out and potential damage to the screw head or tool. | Always use a correctly sized hex wrench that fits snugly into the screw head recess. |
| Over-tightening the brass screw, which can strip the threads or weaken the surrounding material. | Tighten the screw to the recommended torque specification for the application, avoiding excessive force. |
A: This Hex Head Cap Screw, Brass is manufactured from Brass.
A: Electrical connectors and busbars, Marine hardware and fittings, Artistic and decorative metalwork.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||