Engineered for reliable fastening, this M21 x 128mm brass hex head cap screw offers exceptional corrosion resistance and electrical conductivity. Its robust construction ensures secure connections in demanding environments.
| Standard | ASME B18 |
| Material | Brass |
| Finish | Zinc Plated |
| Grade | N/A |
| Size | M21 |
| Length | 128mm |
| Head Width | 13mm |
Trusted by engineers across multiple sectors, this M21 x 128mm brass hex head cap screw is manufactured from high-grade brass, renowned for its excellent corrosion resistance, non-magnetic properties, and good electrical conductivity. The M21 nominal diameter and 128mm length provide substantial grip and clamping force, while the 13mm hex head width ensures compatibility with standard tooling for secure tightening. This specification is ideal for applications requiring resistance to moisture, chemicals, and where non-sparking properties are beneficial.
This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.
1. Select the appropriate tool (e.g., socket wrench) matching the 13mm hex head width. 2. Ensure the mating threads are clean and free of debris. 3. Thread the cap screw into the receiving component, applying consistent torque until the desired clamping force is achieved. Avoid over-tightening.
| 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) |
|---|---|---|
| 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 |
|---|---|
| Using excessive force, leading to stripped threads or fastener failure. | Apply torque gradually and refer to recommended torque specifications for the material and application to prevent damage. |
| Using the wrong size tool on the hex head, causing cam-out and potential damage. | Always use a properly sized socket or wrench that fully engages the 13mm hex head to ensure secure grip and efficient torque transfer. |
A: This Hex Head Cap Screw, Brass is manufactured from Brass.
A: Marine hardware and fittings, Electrical connectors and grounding systems, Decorative architectural elements, Plumbing and HVAC systems.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||