Engineered for superior corrosion resistance and strength, this M21x72mm hex head cap screw is crafted from premium 316 stainless steel. Ideal for critical fastening applications where reliability is paramount.
| Standard | ASTM A106 |
| Material | 316 Stainless Steel |
| Finish | Black Oxide |
| Grade | N/A |
| Size | M21 |
| Length | 72mm |
| Head Width | 34mm |
Precision-manufactured to tight tolerances, this M21x72mm hex head cap screw offers exceptional performance in corrosive environments. Constructed from 316 stainless steel, it provides superior resistance to pitting and crevice corrosion, making it ideal for marine, chemical processing, and food industry applications. The robust hex head design with a 34mm width ensures positive engagement with standard tooling for secure installation and torque application. Its metric thread profile guarantees compatibility with a wide range of metric components.
This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.
1. Select the appropriate mating component with a tapped hole or nut. 2. Thread the M21x72mm hex head cap screw into the mating component by hand to ensure proper thread engagement. 3. Use a calibrated torque wrench to tighten the screw to the manufacturer's specified torque value, ensuring consistent and secure fastening.
| 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 |
|---|---|
| Using insufficient torque, leading to loose connections and potential failure. | Always use a calibrated torque wrench and adhere to recommended torque specifications for the mating components. |
| Cross-threading the screw during installation, damaging both the screw and the mating component. | Start thread engagement by hand to confirm proper alignment before applying any tools. |
A: This Hex Head Cap Screw, 316 Stainless Steel is manufactured from 316 Stainless Steel.
A: Marine hardware and deck fittings, Chemical processing equipment, 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. | ||||