ASTM A320 L7 Stud Bolts and Nuts Supplied to Russia

Haihao Group has recently completed the delivery of a batch of high-strength stud bolts and heavy hex nuts to a customer in Russia. The products were manufactured strictly in accordance with ASTM, BS, and ASME standards, meeting the customer’s requirements for strength, dimensional accuracy, coating performance, and full material traceability.

This shipment demonstrates Haihao Group’s capability to supply critical bolting solutions for demanding industrial and energy applications, including projects operating under low-temperature or harsh service conditions.

ASTM A320 Grade L7 stud bolts with ASTM A194 Grade 7 heavy hex nuts

ASTM A320 Grade L7 Stud Bolts with Heavy Hex Nuts

The supplied products mainly consist of ASTM A320 Grade L7 stud bolts matched with ASTM A194 Grade 7 or Grade 4 heavy hex nuts, designed for high-load flange connections.

Key specifications include:

• Stud bolt material: ASTM A320 Grade L7
• Nut material: ASTM A194 Grade 7 / Grade 4
• Thread types: 8UN, UNC
• Thread class: ASME B1.1 Class 2A (bolt) / Class 2B (nut)
• Nut type: UN Heavy Hexagonal
• Nuts per bolt: 2

These A320 L7 stud bolts with A194 heavy hex nuts are widely used in pressure vessels, pipelines, and flange joints where mechanical strength and reliability are critical.

Wide Range of Sizes and Lengths

To meet different flange thicknesses and installation requirements, the order includes multiple sizes and lengths:

• 1 3/8 inch stud bolts, 290 mm length, 8UN thread
• 7/8 inch stud bolts, 6 inch length, UNC thread
• 3 1/2 inch stud bolts, 720 mm length, 8UN thread
• 3 1/2 inch stud bolts, 890 mm length, 8UN thread

All stud bolts are supplied with matched nuts, ensuring proper engagement and tightening performance during installation.

Aluminum Filled Ceramic Coating for Enhanced Protection

Part of the shipment features aluminum filled ceramic coating, applied to meet specific corrosion protection and anti-galling requirements.

Coated stud bolt features:

• Improved corrosion resistance
• Reduced friction during tightening
• Enhanced service life in aggressive environments

These ceramic coated ASTM A320 L7 stud bolts are suitable for offshore, petrochemical, and energy projects where environmental protection is essential.

Compliance with International and Project Standards

Haihao Group manufactured the stud bolts and nuts in compliance with multiple international and project-specific standards, including:

• Design standards: BS 4882, ASME B18.2.2
• Thread standard: ASME B1.1
• Inspection & certification: EN 10204 3.1, ISO 10474 3.1
• Project requirements: MESC SPE 81/002, MESC SPE 81/010
• Optional compliance: NACE requirements for hydrocarbon service

Complete material test certificates (K09) were provided with the shipment to ensure full traceability and quality assurance.

Reliable Bolting Solutions for the Russian Market

With extensive experience in supplying ASTM A320 L7 stud bolts and A194 nuts to international markets, Haihao Group supports customers across Russia and Eastern Europe with:

• High-strength bolting products
• Custom sizes and coatings
• Strict quality control and documentation
• Reliable export packaging and on-time delivery

Our bolting solutions are widely applied in oil & gas, petrochemical, power generation, and heavy industrial projects.