This M21x137mm Hex Head Cap Screw, crafted from premium brass, offers exceptional corrosion resistance and durability. Its robust construction ensures reliable fastening in demanding applications.
| Standard | DIN 933 |
| Material | Brass |
| Finish | Passivated |
| Grade | N/A |
| Size | M21 |
| Length | 137mm |
| Head Width | 35mm |
Engineered for reliability and performance, this M21x137mm Hex Head Cap Screw boasts a substantial 35mm head width for optimal torque application and secure seating. Fabricated from high-grade brass, it exhibits excellent resistance to galvanic corrosion and chemical degradation, making it ideal for marine, chemical processing, and outdoor environments. The precisely machined threads conform to international standards, ensuring seamless integration with M21 tapped holes and nuts, providing a strong and stable mechanical joint with superior tensile and shear strength.
This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.
1. Select the appropriate mating component with an M21 internal thread. 2. Insert the cap screw through the components to be joined. 3. Tighten the cap screw using a suitable wrench applied to the 35mm hex head, ensuring the specified torque is achieved without over-tightening.
| 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 | Moderate |
| Marine / Saltwater | Not Recommended |
| Chemical / Acidic | Not Recommended |
| ❌ Mistake | ✅ Correct Approach |
|---|---|
| Using excessive force leading to thread stripping or component damage. | Apply the recommended torque specification for the M21 size and the materials being joined. Consult engineering drawings or torque charts. |
| Incorrectly matching thread pitch or diameter, leading to cross-threading. | Always verify that the M21 thread size and pitch of the cap screw are compatible with the M21 tapped hole or nut before attempting installation. Hand-start the screw to check for proper engagement. |
A: This Hex Head Cap Screw, Brass is manufactured from Brass.
A: Marine hardware and fittings, Chemical processing equipment, Electrical grounding and bonding applications, Architectural metalwork in corrosive environments.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||