This M21x56mm Hex Head Cap Screw, crafted from high-strength carbon steel, provides superior torque transfer and durability for critical industrial assemblies and structural connections.
| Standard | ISO 9001 |
| Material | Carbon Steel |
| Finish | Passivated |
| Grade | N/A |
| Size | M21 |
| Length | 56mm |
| Head Width | 24mm |
Built to exacting engineering tolerances, this M21x56mm hex head cap screw features a nominal diameter of M21, a grip length of 56mm, and a hex head with a nominal width of 24mm across flats. Manufactured from premium carbon steel, it offers excellent tensile strength and shear resistance, making it suitable for high-load applications where reliability and structural integrity are paramount. The robust design ensures secure mating with standard M21 threaded holes and facilitates efficient torque application via a socket wrench or hex key.
This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.
1. Ensure mating threads are clean and free from debris. 2. Engage the screw into the threaded hole, hand-tightening initially to confirm alignment. 3. Apply appropriate torque using a calibrated wrench to the specified tightening torque for the application, ensuring even tightening if multiple fasteners are used.
| 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 or tool, leading to stripped hex head. | Always use a wrench or socket that precisely matches the 24mm hex head width to ensure proper engagement and prevent damage. |
| Over-tightening, causing thread damage or fastener failure. | Adhere to recommended torque specifications for the specific material and application to avoid compromising the screw's integrity. |
A: This Hex Head Cap Screw, Carbon Steel is manufactured from Carbon Steel.
A: Heavy machinery assembly, Structural steel connections, Automotive and aerospace sub-assemblies.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||