Engineered for demanding environments, this M21 x 66mm hex head cap screw is manufactured from premium 316 stainless steel, offering superior corrosion and chemical resistance for critical structural connections.
| Standard | DIN 933 |
| Material | 316 Stainless Steel |
| Finish | Passivated |
| Grade | N/A |
| Size | M21 |
| Length | 66mm |
| Head Width | 22mm |
Trusted by engineers across multiple sectors, this M21 x 66mm hex head cap screw is precision-machined from high-grade 316 stainless steel, renowned for its exceptional resistance to pitting and crevice corrosion, particularly in chloride-rich environments. With a nominal diameter of M21 and a length of 66mm, the fastener features a robust hex head with a 22mm width, ensuring secure torque application. Its inherent non-magnetic properties and excellent strength make it the preferred choice for applications in marine, chemical processing, food and beverage, and pharmaceutical industries where hygiene and material integrity are paramount.
This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.
1. Clean mating surfaces and threads of both the screw and the receiving component to remove any debris or contaminants. 2. Hand-thread the screw to ensure proper engagement and prevent cross-threading. 3. Using a properly calibrated torque wrench and an appropriate socket, tighten the hex head cap screw to the manufacturer's 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 |
|---|---|
| Overtightening the fastener, leading to thread stripping or material deformation. | Always adhere to the recommended torque specifications for the specific application and material being joined. Utilize a calibrated torque wrench. |
| Using a standard carbon steel screw in a corrosive environment, resulting in premature failure due to rust and degradation. | Select fasteners made from materials specifically suited to the environmental conditions. 316 stainless steel is essential for marine, chemical, and high-moisture applications. |
A: This Hex Head Cap Screw, 316 Stainless Steel is manufactured from 316 Stainless Steel.
A: Marine hardware and vessel construction, Chemical processing equipment and piping, Food and beverage processing machinery, Pharmaceutical manufacturing equipment, Structural components in corrosive environments.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||