This M21x123mm Hex Head Cap Screw, crafted from robust carbon steel, is engineered for superior strength and durability in critical industrial applications. Its precise dimensions ensure secure and reliable fastening.
| Standard | DIN 933 |
| Material | Carbon Steel |
| Finish | Zinc Plated |
| Grade | N/A |
| Size | M21 |
| Length | 123mm |
| Head Width | 21mm |
A high-performance industrial component, this M21x123mm Hex Head Cap Screw is manufactured from high-grade carbon steel, offering excellent tensile strength and resistance to shear forces, making it ideal for heavy-duty applications. The M21 thread size ensures compatibility with standard M21 nuts and tapped holes, while the 123mm length provides ample grip for joining thicker components. The 21mm hex head facilitates high torque application with standard tooling, enabling secure and reliable connections in demanding environments. Its material properties make it suitable for use in construction, machinery, and structural assemblies where load-bearing capacity is 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 and socket for the M21 hex head. 2. Ensure the mating threaded hole or nut is clean and free of debris. 3. Thread the cap screw into the assembly by hand to prevent cross-threading, then tighten to the specified torque value using the torque wrench.
| Standard System | Designation |
|---|---|
| ISO Equivalent | ISO 898-1 / ISO 4014 |
| DIN Equivalent | DIN 931 / DIN 933 |
| Primary Standard | DIN 933 |
| 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 impact wrench which can over-torque and damage the threads or component. | Always use a calibrated torque wrench to achieve the correct tightening specification. |
| Not cleaning the mating threads, leading to galling or reduced clamping force. | Thoroughly inspect and clean both the screw threads and the mating threads before assembly. |
A: This Hex Head Cap Screw, Carbon Steel is manufactured from Carbon Steel.
A: Heavy machinery assembly, Structural steel connections, Automotive manufacturing.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||