This M21 x 103mm hex head cap screw, constructed from durable carbon steel, is engineered for superior strength and reliable performance in critical industrial applications.
| Standard | ISO 9001 |
| Material | Carbon Steel |
| Finish | Plain |
| Grade | N/A |
| Size | M21 |
| Length | 103mm |
| Head Width | 32mm |
Engineered for reliability and performance, this M21 x 103mm hex head cap screw boasts a robust carbon steel construction, offering excellent tensile strength and shear resistance for demanding load-bearing applications. With a nominal diameter of M21, a substantial length of 103mm, and a head width of 32mm, it ensures secure and stable fastening. The inherent properties of carbon steel provide a cost-effective yet high-performance solution for structural assembly and heavy-duty machinery.
This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.
1. Ensure the mating threads are clean and free of debris. 2. Insert the cap screw through the components to be joined. 3. Tighten the cap screw using an appropriately sized wrench or socket, applying torque according to specified load requirements.
| 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 | Moderate |
| Marine / Saltwater | Not Recommended |
| Chemical / Acidic | Not Recommended |
| ❌ Mistake | ✅ Correct Approach |
|---|---|
| Using the wrong size wrench, leading to stripped heads or improper tightening. | Always use a wrench or socket that precisely matches the head width (32mm for this M21 screw) to ensure proper engagement and prevent damage. |
| Over-tightening, which can lead to thread stripping or material fatigue in the components being fastened. | Adhere to specified torque values. Consult engineering drawings or torque charts for the correct tightening force to avoid over-stressing the fastener and joint. |
A: This Hex Head Cap Screw, Carbon Steel is manufactured from Carbon Steel.
A: Heavy machinery assembly, Structural steel fabrication, 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. | ||||