This M21x141mm hex head cap screw, forged from high-grade carbon steel, offers exceptional tensile strength and durability. Its 13mm head width ensures secure torque application for critical structural and mechanical assemblies.
| Standard | ISO 9001 |
| Material | Carbon Steel |
| Finish | Black Oxide |
| Grade | N/A |
| Size | M21 |
| Length | 141mm |
| Head Width | 13mm |
Specified by design engineers worldwide, this M21x141mm hex head cap screw is manufactured from premium carbon steel, offering superior tensile and shear strength for load-bearing applications. The M21 metric thread size ensures compatibility with standard M21 nuts and tapped holes. Its robust head geometry, with a 13mm width, allows for efficient torque transmission via standard hex wrenches, minimizing the risk of stripping. This fastener is engineered for applications demanding high clamping force and reliable joint integrity in environments subject to vibration or significant stress.
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. Apply appropriate lubricant or threadlocker if specified by design. 3. Hand-tighten the screw to seat the threads, then use a calibrated torque wrench to achieve the specified torque value.
| Standard System | Designation |
|---|---|
| ISO Equivalent | ISO 898-1 / ISO 4014 |
| DIN Equivalent | DIN 931 / DIN 933 |
| Primary Standard | ISO 9001 |
| 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) |
|---|---|---|
| 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 | Moderate |
| Marine / Saltwater | Not Recommended |
| Chemical / Acidic | Not Recommended |
| ❌ Mistake | ✅ Correct Approach |
|---|---|
| Over-tightening leading to thread stripping or fastener fracture. | Utilize a calibrated torque wrench and adhere strictly to the design's specified torque values. |
| Using an incorrect size or type of wrench, resulting in head damage or insufficient torque. | Employ a correctly sized hex socket or wrench that fits snugly on the head for optimal force application. |
A: This Hex Head Cap Screw, Carbon Steel is manufactured from Carbon Steel.
A: Heavy machinery assembly, Structural steel connections, Automotive chassis 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. | ||||