This robust M21 x 111mm hex head cap screw, crafted from high-grade carbon steel, offers exceptional tensile strength and durability for critical structural and machinery applications requiring reliable fastening.
| Standard | DIN 933 |
| Material | Carbon Steel |
| Finish | Zinc Plated |
| Grade | N/A |
| Size | M21 |
| Length | 111mm |
| Head Width | 11mm |
Manufactured under strict quality controls, this M21 x 111mm hex head cap screw features a nominal diameter of M21 and an effective length of 111mm. The head width measures 11mm, providing ample surface area for torque application via standard socket wrenches. Constructed from high-tensile carbon steel, it exhibits superior shear and tensile strength, making it ideal for load-bearing connections in heavy machinery, structural steel frameworks, and robust assemblies subjected to significant mechanical stress. Compliance with relevant industry standards ensures consistent performance and interchangeability.
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 size (11mm) for the hex head. 2. Ensure mating threads are clean and free from debris. 3. Thread the cap screw into the pre-drilled and tapped hole, tightening to the specified torque value for the application.
| 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 undersized or oversized wrench, leading to head stripping or insufficient torque. | Always use a wrench that precisely fits the 11mm hex head for optimal torque transfer and fastener integrity. |
| Over-tightening, which can lead to thread damage or material fatigue in the components being joined. | Refer to engineering specifications or torque charts for the correct tightening torque based on the application and materials. |
A: This Hex Head Cap Screw, Carbon Steel is manufactured from Carbon Steel.
A: Heavy machinery assembly, Structural steel connections, Automotive chassis and engine 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. | ||||