Engineered for robust connections, this M4 x 81mm hex cap screw boasts superior tensile strength and corrosion resistance. Ideal for critical infrastructure and demanding environments.
| Standard | ISO 9001 |
| Material | 304 Stainless Steel |
| Finish | Black Oxide |
| Grade | N/A |
| Size | M4 |
| Length | 81mm |
| Head Width | 17mm |
Purpose-built for heavy-duty applications, this M4 x 81mm hex cap screw is manufactured from premium 304 stainless steel, offering exceptional tensile strength and excellent resistance to corrosion, rust, and pitting, even in harsh chemical or marine environments. The machine thread ensures a secure, reliable fit within tapped holes or with mating nuts. Its robust hex head, with a nominal width of 17mm, provides ample surface area for torque application using standard wrenches or socket drivers, facilitating efficient assembly and disassembly of critical machinery, structural components, and high-stress equipment where consistent performance is paramount.
This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.
1. Ensure the mating threaded hole or nut is clean and free of debris. 2. Insert the M4 x 81mm hex cap screw by hand, ensuring smooth thread engagement. 3. Tighten the screw using an appropriate wrench or socket driver, applying torque gradually to the specified level for the application. Avoid over-tightening.
| Standard System | Designation |
|---|---|
| ISO Equivalent | ISO 898-1 / ISO 4014 |
| DIN Equivalent | DIN 931 / DIN 933 |
| Primary Standard | ISO 9001 |
| 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) |
|---|---|---|
| M4 | Check Calculator | Reduce by 25% |
| Size / Type | Est. Weight (lbs/100) | Shipping Weight (kg) |
|---|---|---|
| M4 | Varies by dimension | Contact Sales |
| Environment | Rating |
|---|---|
| Indoor / Dry | Excellent |
| Outdoor / Exposed | Excellent |
| Marine / Saltwater | Good |
| Chemical / Acidic | Not Recommended |
| ❌ Mistake | ✅ Correct Approach |
|---|---|
| Using the wrong size wrench, leading to stripped head or improper torque. | Always use a wrench or socket that precisely matches the 17mm head width of the cap screw to ensure proper engagement and torque application. |
| Forcing the screw into a misaligned or damaged thread. | Always start threading the screw by hand to confirm alignment. If resistance is met, back out the screw and inspect the threads of both the screw and the mating component before proceeding. |
A: This Hex Head Cap Screw, 304 Stainless Steel is manufactured from 304 Stainless Steel.
A: Structural steel connections, Machinery assembly and repair, Marine and offshore equipment.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||