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316 stainless steel square head plug with MNPT threads

Value Brand

Value Brand 3/4" MNPT 316 SS Square Head Plug

SKU CH-04K0-6J5JM

3/4-inch MNPT square-head plug in 316 stainless steel rated 3000 psi at 100 °F and 2500 psi steam at 350 °F

  • 316 stainless steel resists corrosion in harsh environments
  • Class 3000 rating handles 3000 psi at 100 degrees F
  • Square head design allows positive wrench engagement
  • ASTM A182 material standard ensures consistent alloy quality
  • ANSI ASME B1.20.1 threads provide reliable seal compatibility

3/4" MNPT 316 Stainless Steel Square Head Plug

This 3/4 inch MNPT square head plug is made from 316 stainless steel for corrosion resistance in piping systems. It suits installers and maintenance teams who need a reliable threaded closure for Class 3000 fittings. The plug conforms to ASTM A182 material standards and ANSI/ASME B1.20.1 threads meeting ASME B16.11. It is a new component for industrial and commercial plumbing applications.

Replaces damaged or missing plugs in 3/4 inch NPT

Use this plug to seal unused female NPT openings or replace corroded carbon steel plugs where 316 stainless steel offers better chemical compatibility. The jump is worth it when the system sees up to 3000 psi at 100 degrees F or 2500 psi steam at 350 degrees F and the existing material cannot handle those conditions. It fits Class 3000 forged fittings per ASME B16.11.

Verify the mating port is 3/4 inch female NPT

Check that the system pressure and temperature stay within the 3000 psi at 100 degrees F and 2500 psi steam at 350 degrees F limits. Confirm the thread form matches ANSI/ASME B1.20.1 so the MNPT threads engage correctly. Ensure the media is compatible with 316 stainless steel and that the fitting schedule aligns with ASME B16.11 requirements.

How it compares

Measured against everything we stock in Hose Fittings, Adapters & Clamps, at today’s prices. Recalculated every night.

Price $5.99
Cheaper than about 80% of the 2,955 comparable items (median $17.99).

Specifications

Product
Brand nameZORO SELECT

Questions about this item

What size wrench fits the square head on this 3/4" MNPT plug?

The square head on this 3/4" MNPT plug is designed for a standard pipe wrench or adjustable wrench; the 316 stainless steel material conforms to ASTM A182 and threads meet ANSI/ASME B1.20.1 for reliable engagement.

How do I install this Class 3000 fitting without damaging the 316 stainless threads?

Apply PTFE tape or pipe thread sealant to the MNPT threads, hand-tighten the square head plug, then finish with a wrench — the common mistake is over-torquing, which can gall the 316 stainless steel threads.

When should I replace this plug given its 3000 psi pressure rating?

Inspect the 316 stainless square head plug periodically for corrosion, thread deformation or leakage; replace it if the MNPT threads show damage or if the fitting sees pressures beyond the 3000 psi @ 100°F rating.

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