This M21 x 71mm hex head cap screw, forged from superior 316 stainless steel, offers exceptional corrosion resistance and tensile strength. Designed for robust and reliable fastening in challenging environments.
| Standard | ASTM A106 |
| Material | 316 Stainless Steel |
| Finish | Galvanized |
| Grade | N/A |
| Size | M21 |
| Length | 71mm |
| Head Width | 19mm |
Manufactured under strict quality controls, this M21 x 71mm hex head cap screw is engineered for superior performance. The 316 stainless steel composition provides excellent resistance to pitting and crevice corrosion, even in aggressive chemical and marine environments. Its metric coarse thread (M21) and a generous 71mm length, coupled with a nominal head width of 19mm, ensure secure and stable load distribution. This makes it ideal for applications demanding high integrity and long-term durability, such as in the chemical processing, food and beverage, and offshore industries.
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 from debris. 2. Apply appropriate torque using a calibrated wrench, adhering to recommended torque values for the specific joint materials and application. 3. Visually inspect the assembled joint for proper seating and any signs of damage to the fastener or mating components.
| Standard System | Designation |
|---|---|
| ISO Equivalent | ISO 898-1 / ISO 4014 |
| DIN Equivalent | DIN 931 / DIN 933 |
| Primary Standard | ASTM A106 |
| 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) | 16.0 - 18.0% |
| Nickel (Ni) | 10.0 - 14.0% |
| Molybdenum (Mo) | 2.0 - 3.0% |
| 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 | Excellent |
| Chemical / Acidic | Good |
| ❌ Mistake | ✅ Correct Approach |
|---|---|
| Over-tightening the screw, leading to thread stripping or material deformation. | Utilize a torque wrench to apply the manufacturer's recommended torque specification for the application. Avoid exceeding this value. |
| Using the wrong size or type of wrench, which can damage the hex head and lead to an incomplete or loose connection. | Employ a correctly sized hex socket or wrench that fits snugly onto the head to ensure proper engagement and prevent slippage. |
A: This Hex Head Cap Screw, 316 Stainless Steel is manufactured from 316 Stainless Steel.
A: Chemical processing equipment assembly, Marine and offshore structural components, Food and beverage processing machinery.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||