Engineered for superior performance, this M21x56mm hex head cap screw is crafted from high-grade 316 stainless steel. Offering exceptional corrosion resistance and mechanical strength, it ensures reliable fastening in challenging environments.
| Standard | DIN 933 |
| Material | 316 Stainless Steel |
| Finish | Black Oxide |
| Grade | N/A |
| Size | M21 |
| Length | 56mm |
| Head Width | 18mm |
Specified by design engineers worldwide, this M21x56mm hex head cap screw features an M21 nominal thread size and a length of 56mm. The head is designed with a 18mm width for compatibility with standard tooling. Manufactured from 316 stainless steel, it exhibits superior resistance to pitting and crevice corrosion, particularly in chloride-rich environments. This makes it ideal for marine, chemical processing, and food & beverage applications where material integrity 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 threads are clean and free from debris. 2. Engage the cap screw by hand for the first few threads to prevent cross-threading. 3. Tighten using a calibrated torque wrench to the specified torque value for the application, ensuring even pressure distribution.
| 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) | 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 the wrong size wrench, leading to head stripping. | Always use the correct size hex wrench or socket for the 18mm head width. |
| Over-tightening, which can damage the threads or the components being joined. | Adhere to the manufacturer's recommended torque specifications for the application. |
A: This Hex Head Cap Screw, 316 Stainless Steel is manufactured from 316 Stainless Steel.
A: Marine hardware and shipbuilding, 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. | ||||