This M21x75mm hex head cap screw, crafted from high-grade carbon steel, offers superior strength and durability for heavy-duty industrial applications. Its robust design ensures reliable fastening in critical assemblies.
| Standard | ASTM A106 |
| Material | Carbon Steel |
| Finish | Galvanized |
| Grade | N/A |
| Size | M21 |
| Length | 75mm |
| Head Width | 30mm |
Designed for demanding industrial environments, this M21x75mm hex head cap screw features a nominal diameter of M21 and a length of 75mm. The head width measures 30mm, providing ample surface area for torque application. Manufactured from premium carbon steel, it exhibits excellent tensile strength and shear strength, making it ideal for high-stress joints. Its hardened properties resist deformation under significant load, ensuring structural integrity in machinery, construction, and heavy equipment.
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. Thread the cap screw into the designated component by hand to prevent cross-threading. 3. Tighten the cap screw using an appropriately sized wrench or socket to the specified torque value.
| Standard System | Designation |
|---|---|
| ISO Equivalent | ISO 898-1 / ISO 4014 |
| DIN Equivalent | DIN 931 / DIN 933 |
| Primary Standard | ASTM A106 |
| 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 a wrench that is too large or too small for the hex head. | Always use a correctly sized socket or wrench to ensure proper engagement and prevent cam-out or damage to the head. |
| Applying excessive torque, leading to thread stripping or screw fracture. | Consult engineering drawings or torque charts for the recommended torque specification and use a calibrated torque wrench. |
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. | ||||