Engineered for exceptional strength and corrosion resistance, this M21 x 69mm Hex Cap Screw is manufactured from high-grade 304 stainless steel. Its robust design ensures reliable fastening in challenging environments.
| Standard | ISO 9001 |
| Material | 304 Stainless Steel |
| Finish | Zinc Plated |
| Grade | N/A |
| Size | M21 |
| Length | 69mm |
| Head Width | 33mm |
Trusted by engineers across multiple sectors, this M21 x 69mm Hex Cap Screw offers superior performance due to its construction from 304 stainless steel, renowned for its excellent resistance to corrosion and pitting, even in marine or chemical-intensive environments. The M21 diameter ensures significant tensile strength, while the 69mm length provides ample thread engagement for secure assemblies. The 33mm hex head allows for high torque application with standard tooling, making it ideal for structural, mechanical, and outdoor infrastructure projects where durability and longevity are paramount.
This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.
1. Select the appropriate wrench or socket size (33mm) for the hex head. 2. Ensure the mating threads are clean and free from debris. 3. Thread the screw into the desired component, applying consistent torque until snug, then tighten to the specified torque value for the application.
| Standard System | Designation |
|---|---|
| ISO Equivalent | ISO 898-1 / ISO 4014 |
| DIN Equivalent | DIN 931 / DIN 933 |
| Primary Standard | ISO 9001 |
| 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 undersized or incorrect tooling, leading to cam-out and potential damage to the fastener head. | Always use a correctly sized 33mm hex socket or wrench to ensure proper engagement and optimal torque transfer. |
| Cross-threading the screw, which can strip the threads of both the screw and the mating component. | Start threading the screw by hand to confirm it engages smoothly. If resistance is met, back it out and realign. |
A: This Hex Head Cap Screw, 304 Stainless Steel is manufactured from 304 Stainless Steel.
A: Structural steel connections, Marine and offshore equipment, Industrial machinery and equipment, Outdoor infrastructure and signage.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||