Engineered for demanding environments, this M21x82mm hex head cap screw, forged from high-grade 304 stainless steel, ensures exceptional strength and corrosion resistance. Its 20mm head width provides optimal torque application.
| Standard | ASME B18 |
| Material | 304 Stainless Steel |
| Finish | Black Oxide |
| Grade | N/A |
| Size | M21 |
| Length | 82mm |
| Head Width | 20mm |
A proven choice for industrial professionals, this M21x82mm hex head cap screw boasts a robust 304 stainless steel construction, renowned for its excellent tensile strength and superior resistance to oxidation and corrosion across a wide temperature range. The M21 designation signifies its metric thread size, while the 82mm length provides substantial engagement for secure fastening. The 20mm hex head width is engineered for compatibility with standard industrial tools, facilitating efficient installation and reliable torque application. This fastener is ideal for applications requiring long-term durability in harsh or corrosive atmospheres, such as marine, chemical processing, and outdoor structural assemblies.
This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.
1. Ensure the mating threads are clean and free of debris. 2. Insert the cap screw through the components to be joined. 3. Tighten the cap screw using an appropriate wrench or socket to the recommended torque specification, ensuring a secure and stable connection.
| 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 |
|---|---|
| Overtightening the screw, leading to thread stripping or component damage. | Utilize a torque wrench and adhere to the recommended torque specifications for the material and application. |
| Using the wrong size wrench, which can round off the hex head and prevent proper tightening. | Always use a correctly sized wrench or socket that fits snugly on the hex head. |
A: This Hex Head Cap Screw, 304 Stainless Steel is manufactured from 304 Stainless Steel.
A: Structural steel connections, Machinery and equipment assembly, Marine and offshore installations.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||