Engineered for robust industrial applications, this M21x112mm hex head cap screw is crafted from premium 304 stainless steel. It offers superior corrosion resistance and high tensile strength for secure and reliable fastening in challenging environments.
| Standard | DIN 933 |
| Material | 304 Stainless Steel |
| Finish | Black Oxide |
| Grade | N/A |
| Size | M21 |
| Length | 112mm |
| Head Width | 21mm |
Designed for demanding industrial environments, this M21x112mm hex head cap screw exhibits exceptional mechanical properties derived from its 304 stainless steel composition. The material provides excellent resistance to corrosion, oxidation, and a wide range of chemicals, making it ideal for marine, chemical processing, and outdoor infrastructure. With a nominal diameter of M21 and a length of 112mm, the 21mm hex head width ensures precise torque application with standard tooling. This fastener is engineered to withstand significant tensile and shear loads, ensuring structural integrity in critical assemblies.
This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.
1. Clean the mating threads and the screw threads to remove any debris or contaminants. 2. Apply a suitable lubricant or anti-seize compound if specified by the application to prevent galling and ensure smooth engagement. 3. Insert the screw into the pre-drilled or tapped hole and engage the threads by hand until snug. 4. Using an appropriate torque wrench, tighten the screw to the specified torque value, ensuring even pressure across the joint.
| Standard System | Designation |
|---|---|
| ISO Equivalent | ISO 898-1 / ISO 4014 |
| DIN Equivalent | DIN 931 / DIN 933 |
| Primary Standard | DIN 933 |
| 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 |
|---|---|
| Using the wrong size wrench or tool, leading to stripped hex heads. | Always use a properly sized, high-quality wrench or socket that fits snugly on the hex head to prevent slippage and damage. |
| Over-tightening the screw, which can lead to thread stripping or material fatigue. | Adhere strictly to the recommended torque specifications for the application. Use a calibrated torque wrench for accurate tightening. |
| Failing to clean threads before installation, resulting in galling and difficulty in assembly. | Thoroughly clean both the screw threads and the receiving threads to ensure smooth and secure fastener engagement. |
A: This Hex Head Cap Screw, 304 Stainless Steel is manufactured from 304 Stainless Steel.
A: Structural assembly in corrosive environments, Machinery and equipment manufacturing, Marine and offshore applications.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||