This M21 x 21mm Hex Head Cap Screw, crafted from robust carbon steel, offers superior tensile strength. Its precisely machined dimensions ensure a secure and reliable fastening solution for demanding industrial applications.
| Standard | ASME B18 |
| Material | Carbon Steel |
| Finish | Galvanized |
| Grade | N/A |
| Size | M21 |
| Length | 21mm |
| Head Width | 33mm |
Built to exacting engineering tolerances, this M21 x 21mm Hex Head Cap Screw features a 33mm head width for optimal torque application. Constructed from high-grade carbon steel, it delivers excellent tensile and shear strength, making it suitable for high-stress environments. The material's inherent toughness and resistance to deformation ensure long-term performance in dynamic load conditions. This fastener is engineered for critical assemblies where structural integrity and reliability 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 torque wrench calibrated to the recommended torque specification for the M21 thread size and the materials being joined. 2. Ensure the mating threads are clean and free from any debris or damage. Apply a suitable lubricant if specified for the application to prevent galling and ensure consistent torque. 3. Thread the cap screw into the tapped hole or nut by hand for the initial turns to prevent cross-threading. Tighten to the specified torque using the calibrated torque wrench.
| 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) |
|---|---|---|
| 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 | Not Recommended |
| Chemical / Acidic | Not Recommended |
| ❌ Mistake | ✅ Correct Approach |
|---|---|
| Over-torquing the cap screw, leading to thread stripping or bolt breakage. | Always use a calibrated torque wrench and adhere to the manufacturer's recommended torque specifications for the specific fastener size and application. |
| Using the wrong size or type of wrench, which can round off the hex head and prevent proper tightening or removal. | Utilize a properly sized, high-quality hex socket or wrench that fully engages the hex head to ensure maximum contact and prevent damage. |
| Failure to clean mating threads, leading to increased friction and inaccurate torque readings, or potential galling. | Thoroughly inspect and clean both the cap screw threads and the mating threads before assembly. Remove any dirt, debris, or old thread-locking compounds. |
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. | ||||