3/8" UNC Stainless Steel Grade 316 Hex Head Bolts Made to DIN 931

3/8" UNC Stainless Steel Grade 316 Hex Head Bolts, manufactured according to DIN 931 standards, are high-quality fasteners designed for applications that demand both strength and excellent corrosion resistance. The combination of 316 stainless steel and the UNC thread pattern makes these bolts particularly suitable for challenging environments, such as marine and chemical industries.

Characteristics

1. Material:
   • Grade 316 Stainless Steel: Known for its superior corrosion resistance, especially in chloride-rich environments (like seawater), and in industrial atmospheres.
2. Thread Type:
   • UNC (Unified National Coarse): The 3/8" UNC thread features 16 threads per inch (TPI), offering a coarse thread profile that is easier to install and less prone to stripping.
3. Standards:
   • DIN 931: Specifies the dimensions and mechanical properties for partially threaded hex bolts, ensuring uniformity, strength, and reliability.

Dimensions and Spanner Size

Below are the detailed dimensions and spanner size for a 3/8" UNC hex head bolt made to DIN 931:

1. Diameter: 3/8 inch (9.525 mm)
2. Thread Pitch: 16 threads per inch (TPI) for UNC
3. Hex Head Dimensions:
   • Across Flats (AF): 9/16 inch (14.29 mm)
   • Across Corners (AC): Approximately 0.650 inch (16.51 mm)
   • Head Height (k): Approximately 0.241 inch (6.12 mm)
4. Spanner Size: 9/16 inch (14.29 mm)
5. Shank Length: Variable, depending on the overall length of the bolt, with partial threading.
6. Thread Length: For bolts up to 125 mm in length, the thread length is 2 x diameter + 6 mm. For bolts longer than 125 mm, the thread length is 2 x diameter + 12 mm.

Applications

1. Marine Applications:
   • Ideal for shipbuilding, dock construction, and other applications exposed to seawater.
2. Chemical Processing:
   • Used in chemical plants and industries where exposure to corrosive chemicals is frequent.
3. Construction:
   • Suitable for outdoor structures, bridges, and buildings, particularly in coastal or industrial environments.
4. Automotive and Aerospace:
   • Applied in critical areas exposed to harsh environmental conditions.

Benefits

• Corrosion Resistance: Grade 316 stainless steel contains molybdenum, which significantly improves its resistance to corrosion and oxidation, especially in chloride-rich and industrial environments.
• Strength: Offers high tensile strength, making it suitable for high-stress applications.
• Durability: Long-lasting and requiring minimal maintenance, providing a cost-effective solution for long-term applications.

Installation Tips

• Spanner/Wrench Size: Use a 9/16 inch spanner or wrench to tighten the hex head bolt.
• Pre-Drilling: When used in wood or other softer materials, pre-drilling a pilot hole can help prevent splitting and ensure a secure fit.
• Torque Specifications: Adhere to the appropriate torque specifications to avoid over-tightening, which could damage the bolt or the material being fastened.

Conclusion

3/8" UNC stainless steel grade 316 hex head bolts made to DIN 931 are essential for applications that require both high durability and resistance to corrosion. Their robust construction and adherence to DIN 931 standards ensure reliability and consistency in demanding environments. These bolts are ideal for marine, chemical, construction, and industrial applications, providing a secure and long-lasting fastening solution.