This M21x120mm brass hex head cap screw is engineered for superior performance in corrosive environments. Its robust construction ensures reliable fastening for critical structural and mechanical assemblies.
| Standard | ASME B18 |
| Material | Brass |
| Finish | Plain |
| Grade | N/A |
| Size | M21 |
| Length | 120mm |
| Head Width | 10mm |
Purpose-built for heavy-duty applications, this M21x120mm hex head cap screw features a nominal diameter of M21 and a substantial 120mm length, providing deep thread engagement. The head measures 10mm across flats, ensuring compatibility with standard hex drivers. Constructed from high-grade brass, this fastener offers exceptional corrosion resistance, making it ideal for marine, chemical processing, and outdoor environments where rust and degradation are significant concerns. Brass also provides good electrical conductivity and is non-sparking. Its tensile strength, while not equivalent to steel, is sufficient for many demanding industrial applications requiring its unique material properties.
This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.
1. Ensure the tapped hole or nut is clean and free from debris. 2. Thread the cap screw by hand for the first few turns to prevent cross-threading. 3. Tighten the screw using an appropriate hex socket wrench, applying torque gradually to the specified value for the application, ensuring even pressure.
| 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 | Moderate |
| Marine / Saltwater | Not Recommended |
| Chemical / Acidic | Not Recommended |
| ❌ Mistake | ✅ Correct Approach |
|---|---|
| Using excessive force leading to over-tightening and potential thread stripping or bolt breakage. | Always adhere to recommended torque specifications for the material and application. Utilize a torque wrench for precise control. |
| Not verifying the compatibility of the thread size and pitch with the receiving component. | Confirm that the M21 thread size and pitch of the cap screw precisely match the internal threads of the nut or tapped hole. |
A: This Hex Head Cap Screw, Brass is manufactured from Brass.
A: Marine hardware and deck fittings, Chemical processing equipment, Outdoor structural components, Electrical grounding 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. | ||||