This M21x29mm hex head cap screw is engineered from high-grade carbon steel for exceptional strength and durability. Featuring a 23mm head width for superior torque application, it ensures secure and reliable fastening in critical assemblies.
| Standard | ISO 9001 |
| Material | Carbon Steel |
| Finish | Galvanized |
| Grade | N/A |
| Size | M21 |
| Length | 29mm |
| Head Width | 23mm |
Precision-manufactured to tight tolerances, this M21x29mm hex head cap screw offers superior performance in demanding environments. Constructed from hardened carbon steel, it exhibits excellent tensile strength and shear resistance, making it ideal for load-bearing applications. The 23mm hexagonal head allows for optimal torque application with standard tooling, ensuring secure seating and preventing loosening under vibration. Its robust design ensures long-term structural integrity in machinery, construction, and heavy-duty equipment.
This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.
1. Select the appropriate wrench or socket for the M21 hex head. 2. Insert the screw into the pre-drilled and tapped hole or mating component. 3. Tighten the screw to the recommended torque specification using a calibrated torque wrench.
| 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 | Excellent |
| Marine / Saltwater | Not Recommended |
| Chemical / Acidic | Not Recommended |
| ❌ Mistake | ✅ Correct Approach |
|---|---|
| Using an undersized or worn wrench, leading to cam-out and potential stripping of the hex head. | Always use a properly sized, high-quality socket or wrench that fits snugly on the hex head to ensure maximum engagement and prevent damage. |
| Over-tightening the screw, which can lead to thread stripping, fastener failure, or damage to the mating components. | Employ a calibrated torque wrench and adhere to the manufacturer's recommended torque values for the specific thread size and material combination. |
A: This Hex Head Cap Screw, Carbon Steel is manufactured from Carbon Steel.
A: Heavy machinery assembly, Structural steel construction, Automotive and aerospace 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. | ||||