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Upchurch Scientific National Pipe Thread NPT Adapter Assy for 3/16 inch OD Tubing, 1/4 NPT Male to 5/16-24 Flat-Bottom Female, PEEK, 100/pk - U-504C

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National Pipe Thread NPT Adapter Assembly for 3/16” OD Tubing, 1/4” NPT Male to 5/16-24 Flat-Bottom Female, 70.4 μL, 0.125” (3.2 mm) Thru hole, 500 psi (34 bar), Natural, PEEK, 100 per pack 

Includes: (1) XP-132 Fitting

Product Number: U-504C

Categories: Connectors, Fluidic Connections, National Pipe Thread Adapters, Threaded Adapters

This Upchurch Scientific / IDEX Health & Science / Biotech Fluidics NPT (National Pipe Thread) Adapter Assembly is specifically manufactured from PEEK making it durable and chemically resistant. It is optimally suited for low pressure applications. It has a tubing OD of 3/16″ and it’s thread configuration is 1/4″ NPT Male to 5/16-24 Flat-Bottom Female ports. It is natural color and comes with (1)OD x P-132 Fitting.

Available in the Following Configurations:

  • U-504 - NPT Adapter Assembly PEEK 1/4 NPT Male x 1/4-28 Female, Single pack
  • U-504C - NPT Adapter Assembly PEEK 1/4 NPT Male x 1/4-28 Female, 100 per pack
  • U-504-01 - NPT Adapter Body PEEK 1/4 NPT Male x 1/4-28 Female, Single pack
  • U-504-01C - NPT Adapter Body PEEK 1/4 NPT Male x 1/4-28 Female, 100 per pack

National Pipe Thread Adapters

These adapters make connections to female 1/8” and 1/4” National Pipe Thread (NPT) ports.

Manufactured from PEEK polymer, our NPT Adapters are durable and chemically resistant. We provide versions with either 1/4-28 or 5/16-24 flat-bottom threads, suitable for most low pressure applications.

Please Note: Wrap the threads on the NPT side of these adapters with thread seal tape (plumber’s tape) to ensure a leak-free seal.

Part No. Description Colour Tubing OD Includes Thru-hole Swept Volume Pressure Rating
1/8” MALE NATIONAL PIPE THREAD ADAPTERS
U-510 PEEK 1/8” NPT, M to 1/4-28 FB, F Adapter Red 1/8” (1) XP-308 0.062” (1.60 mm) 17.3 μL 500 psi (34 bar)
U-514 PEEK 1/8” NPT, M to 5/16-24 FB, F Adapter Natural 3/16” (1) XP-132 0.125” (3.2 mm) 70.4 μL 500 psi (34 bar)
1/4” MALE NATIONAL PIPE THREAD ADAPTERS
U-500 PEEK 1/4” NPT, M to 1/4-28 FB, F Adapter Red 1/8” (1) XP-308 0.062” (1.60 mm) 17.3 μL 500 psi (34 bar)
U-504 PEEK 1/4” NPT, M to 5/16-24 FB, F Adapter Natural 3/16” (1) XP-132 0.125” (3.2 mm) 70.4 μL 500 psi (34 bar)

F = Female (internal) threads; M = Male (external) threads; XL = extra long; C = Coned; FB = Flat-Bottom
* The pressure rating of this adapter exceeds the pressure holding ability of the fittings and tubing used with it.
** Thru-hole tapers from 0.188” (4.80 mm) to 0.125” (3.20 mm).


  • Model: U-504C
  • Manufactured by: Upchurch Scientific