1-1/2 in FNPT 316 Stainless Steel Locknut, Class 150, 300 psi Max Pressure

The ZORO SELECT - 4381038270 is a stainless steel locknut designed to secure conduit, fittings, or pipe hubs to enclosures, junction boxes, or mounting surfaces by clamping the fitting’s threaded neck and preventing axial movement. Constructed from 316 stainless steel, this locknut is rated for use with air, natural gas, non-potable water, oil, and steam systems within the specified pressure ratings. It is designed to operate within a maximum pressure of 300 psi and steam pressure of 150 psi, conforming to Class 150 pressure specifications. The fitting features FNPT connections compatible with 1 1/2 inch nominal pipe sizes and pipe schedule 150.

Key Features:

• Material: 316 Stainless Steel providing corrosion resistance.
• Item Type: Locknut designed to secure fittings and prevent axial movement.
• Application: Suitable for Air, Natural Gas, Non-Potable Water, Oil, Steam.
• Pressure Ratings: Maximum Operating Pressure of 300 psi and Maximum Steam Pressure of 150 psi.
• Connection Type: Female National Pipe Thread (FNPT).
• Nominal Pipe Size: 1 1/2 inch.
• Pipe Schedule: Class 150.
• Hex Size: 2 5/16 inch across flats for wrenching.
• Outside Diameter: 2-19/64 inch; Overall Length: 7/16 inch.
• Standards: Material conforms to ASTM-A-351, Threads conform to ANSI B1.20.1, Meets MSS-SP-114 Class 150 ratings.
• Color: Silver finish.
• Bolt Hole Center to Center: 1 1/2 inch.