This M18 x 81mm Hex Head Cap Screw, crafted from robust carbon steel, offers exceptional tensile strength and durability. Engineered for secure and reliable fastening in critical industrial assemblies.
| Standard | ASME B18 |
| Material | Carbon Steel |
| Finish | Galvanized |
| Grade | N/A |
| Size | M18 |
| Length | 81mm |
| Head Width | 9mm |
Manufactured under strict quality controls, this M18 x 81mm hex head cap screw is forged from high-grade carbon steel, ensuring superior tensile and shear strength for demanding applications. The material's inherent hardness and resistance to deformation make it ideal for load-bearing joints and structural connections. Its precise M18 thread pitch and 81mm length are engineered for optimal engagement with corresponding nuts and tapped holes, providing a secure and long-lasting mechanical bond. The 9mm head width facilitates efficient torque application with standard tools, ensuring consistent and reliable assembly across diverse industrial environments.
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. Thread the cap screw by hand into the pre-tapped hole or with a nut. 3. Tighten to the recommended torque specification using an appropriate hex wrench or socket.
| Standard System | Designation |
|---|---|
| ISO Equivalent | ISO 898-1 / ISO 4014 |
| DIN Equivalent | DIN 931 / DIN 933 |
| Primary Standard | ASME B18 |
| Tensile Strength | Standard Commercial Spec |
| Yield Strength | Standard Commercial Spec |
| Hardness | Varies by specific batch |
| Carbon (C) | 0.28 - 0.55% |
| Manganese (Mn) | 0.60 - 0.90% |
| Phosphorus (P) | 0.04% max |
| Sulfur (S) | 0.05% max |
| Bolt Size | Dry Torque (ft-lbs) | Lubricated Torque (ft-lbs) |
|---|---|---|
| M18 | Check Calculator | Reduce by 25% |
| Size / Type | Est. Weight (lbs/100) | Shipping Weight (kg) |
|---|---|---|
| M18 | Varies by dimension | Contact Sales |
| Environment | Rating |
|---|---|
| Indoor / Dry | Excellent |
| Outdoor / Exposed | Excellent |
| Marine / Saltwater | Not Recommended |
| Chemical / Acidic | Not Recommended |
| ❌ Mistake | ✅ Correct Approach |
|---|---|
| Over-tightening the screw, leading to thread stripping or fastener failure. | Always adhere to the manufacturer's recommended torque specifications for the specific application and material. |
| Using a worn or incorrect size hex wrench, which can damage the screw head and compromise torque application. | Utilize a properly fitting, high-quality hex wrench or socket to ensure full engagement with the screw head. |
A: This Hex Head Cap Screw, Carbon Steel is manufactured from Carbon Steel.
A: Heavy machinery assembly, Structural steel connections, Automotive and transportation components.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||