This M21x139mm brass hex head cap screw offers excellent corrosion resistance and non-magnetic properties. It is precisely engineered for secure fastening in demanding environments, ensuring reliable performance and a clean aesthetic.
| Standard | ISO 9001 |
| Material | Brass |
| Finish | Plain |
| Grade | N/A |
| Size | M21 |
| Length | 139mm |
| Head Width | 31mm |
Precision-manufactured to tight tolerances, this M21x139mm hex head cap screw is constructed from high-grade brass (e.g., UNS C36000), providing superior corrosion resistance to saltwater, chemicals, and atmospheric conditions. The hexagonal head, with a nominal width of 31mm, allows for high torque application via standard wrenches and sockets. Its M21 metric thread ensures a robust and secure connection in a variety of substrates. The inherent non-magnetic properties of brass make it ideal for applications where magnetic interference is a concern, such as in electrical components and sensitive equipment.
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. Hand-thread the screw to confirm proper engagement and alignment. 3. Tighten the screw using an appropriate wrench or socket to the recommended torque specification, avoiding over-tightening.
| Standard System | Designation |
|---|---|
| ISO Equivalent | ISO 898-1 / ISO 4014 |
| DIN Equivalent | DIN 931 / DIN 933 |
| Primary Standard | ISO 9001 |
| 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) |
|---|---|---|
| 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 thread stripping or material deformation. | Consult torque charts for brass fasteners or use a calibrated torque wrench to achieve the correct tension without damaging the components. |
| Mating brass screws with incompatible materials that can cause galvanic corrosion. | When joining dissimilar metals, consider isolating the brass fastener with non-conductive washers or coatings to mitigate galvanic corrosion risks. |
A: This Hex Head Cap Screw, Brass is manufactured from Brass.
A: Electrical conductivity components, Marine hardware and fittings, Decorative and architectural elements, Corrosion-resistant assemblies.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||