Engineered for superior performance in corrosive settings, this M21 x 145mm Hex Head Cap Screw offers robust fastening with its 316 stainless steel construction. Ideal for critical industrial applications.
| Standard | ASTM A106 |
| Material | 316 Stainless Steel |
| Finish | Zinc Plated |
| Grade | N/A |
| Size | M21 |
| Length | 145mm |
| Head Width | 27mm |
Designed for demanding industrial environments, this M21 x 145mm Hex Head Cap Screw is manufactured from premium 316 stainless steel, renowned for its exceptional corrosion and pitting resistance, even in marine and chemical-laden atmospheres. The M21 nominal diameter, coupled with a 145mm length and a 27mm hex head width, provides substantial clamping force and ease of torque application with standard tooling. Its high tensile strength and durability ensure reliable performance under significant mechanical stress and extreme temperatures, making it suitable for structural assemblies, machinery, and outdoor infrastructure where longevity and integrity are paramount.
This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.
1. Ensure mating threads are clean and free of debris. 2. Hand-thread the cap screw to verify alignment and prevent cross-threading. 3. Tighten the cap screw to the specified torque using a calibrated torque wrench, ensuring even pressure distribution.
| Standard System | Designation |
|---|---|
| ISO Equivalent | ISO 898-1 / ISO 4014 |
| DIN Equivalent | DIN 931 / DIN 933 |
| Primary Standard | ASTM A106 |
| 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 a correctly sized hex socket or wrench to match the 27mm head width. |
| Over-torquing the fastener, potentially damaging the threads or the workpiece. | Consult the relevant engineering specifications for the correct torque value and utilize a calibrated torque wrench. |
| Using standard carbon steel fasteners in corrosive environments. | Always select 316 stainless steel for applications exposed to saltwater, chemicals, or high humidity to prevent premature corrosion and failure. |
A: This Hex Head Cap Screw, 316 Stainless Steel is manufactured from 316 Stainless Steel.
A: Marine and offshore equipment, Chemical processing plants, Food and beverage manufacturing, Structural steel assemblies, Heavy machinery and equipment.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||