Haihao Group Ships ASTM A320 L7 Stud Bolts with A194 Gr.7 Nuts to Russia

A batch of flange stud bolt assemblies has left Haihao Group’s factory warehouse, bound for a Russian industrial piping project. This consignment includes two common metric sizes of ASTM A320 L7 stud bolts, fully matched with ASTM A194 Gr.7 heavy hex nuts, manufactured per ASME B18.2 specifications.

The supplied sizes are M18 × 80 mm and M27 × 165 mm. Each ASTM A320 L7 stud bolt is designed for low-temperature service, the key reason this grade was selected for Russia’s harsh operating environments. L7 carbon steel studs maintain reliable tensile strength and toughness under cold conditions, a critical property for outdoor pipeline flange connections that face large seasonal temperature shifts.

Order Specification Summary Table

Matching hardware matters greatly for flange joint integrity. We pair every ASTM A320 L7 stud bolt with ASTM A194 Gr.7 nuts. This material combination forms a proven bolt-nut set, avoiding galvanic mismatch and ensuring consistent preload during flange tightening. All threads are machined to ASME B18.2 tolerances, helping the installation crew achieve smooth assembly without thread galling.

ASTM A320 L7 stud bolts with ASTM A194 Gr.7 nuts M18×80 M27×165 ready for shipment to Russian client

Before packing, our quality team carried out dimension inspection, thread check and material verification for every set. Each ASTM A320 L7 stud bolt was marked with grade and heat traceability marks, so the Russian client can trace material test reports easily during site acceptance and future maintenance work. The bolts and nuts were separated into sealed packaging to prevent surface rust during long overland transit.

Many Russian oil and gas, chemical and power projects require low-temperature bolting. Beyond M18 and M27 sizes, Haihao Group can supply ASTM A320 L7 stud bolt sets in other metric and imperial sizes, matched with A194 Gr.2H, Gr.7, or Gr.8 nuts based on project specification. We also provide full MTR documentation to meet local industrial inspection requirements.

If you are sourcing low temperature flange bolting for your pipeline or pressure vessel project, send over your bolt list. Our engineering team will review your specifications and prepare a detailed quotation with full material documentation.