This M21x34mm brass hex head cap screw offers exceptional corrosion resistance and superior conductivity. Engineered for demanding environments, it provides reliable fastening for electrical, marine, and aesthetic applications.
| Standard | ISO 9001 |
| Material | Brass |
| Finish | Galvanized |
| Grade | N/A |
| Size | M21 |
| Length | 34mm |
| Head Width | 30mm |
Precision-manufactured to tight tolerances, this M21x34mm brass hex head cap screw features a nominal diameter of M21 and a length of 34mm. The hex head measures 30mm across flats, facilitating secure torque application with standard tooling. Composed of high-grade brass (typically UNS C36000 or equivalent), it exhibits excellent machinability, natural corrosion resistance against many chemicals and environments, and good electrical conductivity. This material is inherently non-magnetic, making it suitable for sensitive applications. Its ductility allows for some deformation without fracture, contributing to a robust joint.
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. Apply appropriate lubrication if required by the application or torque specifications. 3. Insert the cap screw and tighten to the specified torque using a calibrated wrench or driver, engaging the hexagonal head.
| 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 | Excellent |
| Marine / Saltwater | Not Recommended |
| Chemical / Acidic | Not Recommended |
| ❌ Mistake | ✅ Correct Approach |
|---|---|
| Over-tightening brass fasteners, which can lead to galling or thread stripping. | Adhere to recommended torque specifications for brass fasteners and use appropriate lubrication to prevent galling. |
| Using standard steel tools that can scratch or damage the brass surface, compromising aesthetics. | Employ tools with soft jaws or protective coatings when working with brass fasteners to maintain surface integrity. |
A: This Hex Head Cap Screw, Brass is manufactured from Brass.
A: Electrical connections and grounding, Marine hardware and fittings, Decorative and architectural elements, Plumbing and valve components.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||