Engineered for robust performance, this M21 x 144mm hex head cap screw is manufactured from premium 304 stainless steel. It offers superior corrosion resistance and high tensile strength, ensuring secure fastening in demanding environments.
| Standard | DIN 933 |
| Material | 304 Stainless Steel |
| Finish | Galvanized |
| Grade | N/A |
| Size | M21 |
| Length | 144mm |
| Head Width | 30mm |
Purpose-built for heavy-duty applications, this M21 x 144mm hex head cap screw features a nominal diameter of M21, a length of 144mm, and a head width of 30mm. Constructed from 304 stainless steel, it provides excellent resistance to corrosion, rust, and pitting, making it ideal for environments exposed to moisture, chemicals, or saltwater. Its robust design ensures high tensile and shear strength, suitable for structural connections, machinery assembly, and critical infrastructure projects where reliability is paramount. The hex head allows for high torque application with standard hex wrenches or sockets, facilitating secure and lasting joins.
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. Apply appropriate lubrication if required by the application to prevent galling, especially in stainless steel. 3. Insert the cap screw and engage the threads by hand before applying torque with a calibrated wrench or socket to the specified torque value.
| 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 |
|---|---|
| Over-torquing, leading to thread stripping or fastener fatigue. | Utilize a torque wrench and adhere to recommended torque specifications for the material and thread size. |
| Using incompatible materials for mating components, potentially causing galvanic corrosion with stainless steel. | Pair 304 stainless steel fasteners with compatible materials like other stainless steels, or materials with similar electrochemical potential. Consult corrosion charts if unsure. |
A: This Hex Head Cap Screw, 304 Stainless Steel is manufactured from 304 Stainless Steel.
A: Structural steel connections, Heavy machinery and equipment assembly, Marine and offshore applications, Chemical processing equipment, Bridge and infrastructure construction.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||