Engineered for superior performance, this M21x41mm hex head cap screw is manufactured from high-grade 304 stainless steel. It offers exceptional corrosion resistance and robust mechanical strength, ideal for critical structural applications.
| Standard | ASME B18 |
| Material | 304 Stainless Steel |
| Finish | Plain |
| Grade | N/A |
| Size | M21 |
| Length | 41mm |
| Head Width | 17mm |
Built to exacting engineering tolerances, this M21x41mm hex head cap screw features a 17mm head width for secure torque application. Composed of 304 stainless steel, it provides excellent resistance to rust and corrosion in harsh environments, making it suitable for marine, chemical processing, and outdoor infrastructure projects. Its robust design ensures reliable load-bearing capacity and long-term structural integrity under stress.
This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.
1. Select the appropriate torque wrench and socket size (17mm). 2. Ensure the mating threads are clean and free of debris. 3. Thread the cap screw into the designated receiving component, applying gradual and even torque until the specified tightness is achieved.
| Standard System | Designation |
|---|---|
| ISO Equivalent | ISO 898-1 / ISO 4014 |
| DIN Equivalent | DIN 931 / DIN 933 |
| Primary Standard | ASME B18 |
| Tensile Strength | 75,000 psi (515 MPa) |
| Yield Strength | 30,000 psi (205 MPa) |
| Elongation in 2 in. | 40% min |
| Hardness | Rockwell B95 max |
| Carbon (C) | 0.08% max |
| Chromium (Cr) | 18.0 - 20.0% |
| Nickel (Ni) | 8.0 - 10.5% |
| Manganese (Mn) | 2.00% max |
| 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 | Good |
| Chemical / Acidic | Not Recommended |
| ❌ Mistake | ✅ Correct Approach |
|---|---|
| Over-tightening the screw, leading to thread stripping or component damage. | Use a calibrated torque wrench and adhere to recommended torque specifications for the material and application. |
| Using the wrong size socket, which can round off the hex head and impede proper tightening. | Always verify that the socket size precisely matches the hex head width (17mm in this case). |
A: This Hex Head Cap Screw, 304 Stainless Steel is manufactured from 304 Stainless Steel.
A: Structural framing in corrosive environments, Marine and offshore equipment assembly, Chemical processing plant maintenance.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||