This M21x72mm hex head cap screw is forged from high-grade 304 stainless steel, offering exceptional corrosion resistance and tensile strength. Engineered for reliable, long-lasting connections in challenging environments.
| Standard | DIN 933 |
| Material | 304 Stainless Steel |
| Finish | Plain |
| Grade | N/A |
| Size | M21 |
| Length | 72mm |
| Head Width | 27mm |
Precision-manufactured to tight tolerances, this M21x72mm hex head cap screw is constructed from premium 304 stainless steel, renowned for its superior corrosion resistance, including against a wide range of chemicals and saltwater. The material's inherent toughness ensures high tensile strength, making it ideal for applications requiring robust and secure fastening under significant load. Its standard hex head design, with a nominal width of 27mm, allows for efficient torque application using standard tools. This screw is engineered for durability and performance in demanding industrial, marine, and construction settings 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 of debris. 2. Hand-thread the cap screw to confirm alignment and prevent cross-threading. 3. Using an appropriate wrench or socket, tighten the screw to the recommended torque specification for the application, ensuring a secure and stable connection.
| 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, leading to stripped head or improper torque. | Always use the correct size wrench or socket that fits snugly on the hex head. |
| Over-tightening the screw, which can lead to thread damage or material fatigue. | Adhere to manufacturer-recommended torque values for the specific application and material. |
| Not verifying thread compatibility between the screw and the mating component. | Confirm that both the screw and the receiving thread are of the same size, pitch, and thread form (e.g., metric M21). |
A: This Hex Head Cap Screw, 304 Stainless Steel is manufactured from 304 Stainless Steel.
A: Marine hardware and equipment, Chemical processing equipment, Outdoor structural assemblies, Food 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. | ||||