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Hex Head Pipe Plug (Hollow/Solid)

Our selection of male npt slot hex head plug fittings are available in north american pipe sizes ranging from 1/8 up to 2 inches. These quality pipe, tank, manifold wrench pipe plug fittings are reusable and can be used for applications involving pneumatics, vacuum, and general fluid handling. Our brass fittings are an economical and durable solution to your piping and plumbing needs. Our flat head head plugs are widely used in industrial manufacturing applications and corrosion resistance is desired, usually these are installed in pneumatic valves, hydraulic valves, manifolds and air tanks or crank cases. Additional usage for other types of fluid transfer and handling non potable water, air and fuel.

Hex head plug fittings are made with high quality yellow brass and are perfect for industrial, construction, trucking and transportation, factory automation.

  • Working Pressure: Up to 1000 PSI
  • -65*F to +265*F
  • Vacuum and Positive Pressure 
  • NPT Thread Size

Advisory: Please make sure you understand the NPT thread sizing proocedure. Print out this handy thread sizing guide (Click Here).

Our quality barbed/threaded connectors/couplers are manufactured FasParts' highest standards. They are perfect for connecting lines for air, water, fuel, oil and inert gases.

Suitable for use in Automotive, Nautical, Industrial, and Commercial applications

Hose ID is the interior diameter of your tubiing/hose it is generally marked on the side of most lengths of hoses/tubing. Tubing Hose ID and Barb Hose ID Must Match

This precision product works great with other quality FasParts accessories.

Cored/Hollow Bottom


121-1 Plug Hex Head;1/16 MPT
121-A Plug Hex Head;1/8 MPT
121-B Plug Hex Head;1/4 MPT
121-C Plug Hex Head;3/8 MPT
121-D Plug Hex Head;1/2 MPT
121-E Plug Hex Head;3/4 MPT

Plug Hex Head;1 MPT



Solid/Flat/Filled Bottom

121S-A Hex Head Plug;1/8 MPT
121S-B Hex Head Plug;1/4 MPT
121S-C Hex Head Plug;3/8 MPT
121S-D Hex Head Plug;1/2 MPT
121S-E Plug Hex Head; 3/4 MPT