This M21 x 133mm hex head cap screw is engineered from robust carbon steel for superior strength and durability in heavy-duty industrial applications.
| Standard | ISO 9001 |
| Material | Carbon Steel |
| Finish | Zinc Plated |
| Grade | N/A |
| Size | M21 |
| Length | 133mm |
| Head Width | 10mm |
Designed for demanding industrial environments, this M21 x 133mm hex head cap screw offers exceptional tensile strength due to its high-quality carbon steel construction. The M21 thread size ensures a secure and reliable connection for substantial loads. With a nominal length of 133mm and a 10mm head width, it provides ample grip for torque application using standard hex tools. This fastener is ideal for machinery assembly, structural components, and critical infrastructure where consistent performance under stress is paramount.
This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.
1. Ensure threads are clean and free of debris on both the screw and mating component. 2. Hand-thread the screw initially to prevent cross-threading. 3. Tighten to the specified torque using an appropriate 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 the wrong size tool, leading to stripped hex heads. | Always use a correctly sized hex socket or wrench that fits snugly. |
| Over-tightening, which can lead to thread damage or fastener failure. | Adhere to the recommended torque specifications for the application and material. |
A: This Hex Head Cap Screw, Carbon Steel is manufactured from Carbon Steel.
A: Heavy machinery assembly, Structural steel connections, Industrial equipment 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. | ||||