Heavy Duty Hex Nuts – 2H, L7 & UNC Threads

Hex nuts are six-sided fasteners with internal threads used in conjunction with bolts, studs, screws, and other externally threaded components. They are essential in a wide range of applications including construction, machinery, pipelines, and structural assemblies.

Hex Nut – 1″-8 UNC, Grade 2H

• Thread Size: 1 inch

• Thread Pitch: 8 TPI (UNC – Unified National Coarse)

• Grade: ASTM A194 Grade 2H

• Material: Medium carbon steel, heat-treated

• Finish Options: Plain (black), Zinc-plated, Hot-dip galvanized

• Hardness: 24–35 HRC (as per ASTM A194)

• Applications: High-pressure and high-temperature services, especially in the petrochemical and oil & gas industries

• Standards: Meets ASTM A194 / ASME B18.2.2

• Typical Pairing: Often used with ASTM A193 Grade B7 bolts

• Temperature Resistance: Suitable for use in elevated temperature environments

• Markings: Stamped with “2H” grade identification

Hex Nut – 7/8″-9 UNC, Grade L7

• Thread Size: 7/8 inch

• Thread Pitch: 9 TPI (UNC – Unified National Coarse)

• Grade: ASTM A320 Grade L7 (when part of a bolt/nut set)

• Material: Alloy steel

• Finish Options: Plain (black), Zinc-coated, PTFE (for corrosion resistance)

• Applications: Low-temperature services such as cryogenic piping systems, LNG processing

• Hardness & Strength: Designed to maintain strength and ductility at low temperatures

• Standard Compatibility: Compatible with ASTM A320 Grade L7 bolts

• Temperature Resistance: Suitable for temperatures as low as -150°F (-101°C)

• Markings: Usually stamped with manufacturer ID and “L7” designation

Hex Nut – 3/4″-10 UNC, General Description

• Thread Size: 3/4 inch

• Thread Pitch: 10 TPI (UNC)

• Common Grades: Can be Grade 2, 5, or 8 (carbon/alloy steel) or 2H for heavy-duty applications

• Material: Varies – carbon steel, alloy steel, or stainless steel

• Finish Options: Plain, Zinc-plated, Hot-dip galvanized, or other protective coatings

• Applications: Widely used in construction, equipment assembly, automotive, and structural joints

• Standards: ASME B18.2.2, ASTM as applicable to grade

• Markings: Grade-specific marks for traceability

General Features of Hex Nuts

• Shape: Hexagonal for easy wrench grip and torque application

• Threading: Internal threads to engage with corresponding external threads

• Usage: Always used in conjunction with bolts or studs for secure fastening

• Installation Tools: Standard wrenches or impact tools

• Custom Options: Available in locking types, flanged bases, or nylon-insert versions (if specified)