Engineered for robust performance, this M21 x 51mm brass hex head cap screw offers exceptional corrosion resistance and reliable fastening for critical industrial assemblies. Its durable construction ensures long-term integrity in challenging environments.
| Standard | DIN 933 |
| Material | Brass |
| Finish | Galvanized |
| Grade | N/A |
| Size | M21 |
| Length | 51mm |
| Head Width | 24mm |
Purpose-built for heavy-duty applications, this M21 x 51mm brass hex head cap screw delivers superior strength and resistance to environmental degradation. Manufactured from high-grade brass, it exhibits excellent ductility and a high tensile strength suitable for demanding structural and mechanical connections. The 24mm head width provides ample surface area for torque application with standard tooling, ensuring secure and consistent assembly. Ideal for marine environments, chemical processing, and applications requiring non-sparking properties, this fastener maintains its integrity under significant load and exposure to corrosive elements.
This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.
1. Ensure the mating threads are clean and free of debris. 2. Apply appropriate lubricant if required by the application to facilitate proper torque. 3. Tighten the cap screw to the specified torque value 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 |
| 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 |
|---|---|
| Over-tightening the brass screw, which can strip threads or deform the fastener. | Always use a calibrated torque wrench and adhere to recommended torque specifications for brass fasteners. |
| Using the wrong size or type of wrench, leading to damaged hex heads. | Utilize a properly sized, high-quality hex socket or wrench to ensure a secure grip and prevent cam-out. |
A: This Hex Head Cap Screw, Brass is manufactured from Brass.
A: Marine Hardware and Fittings, Chemical Processing Equipment, Electrical Connectors and Busbars, Architectural Fixtures.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||