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Upchurch Scientific English Threaded Adapter, 5/16-24 Flat-Bottom Female to 1/4-28 Flat-Bottom Male Thread, 3.20 mm Thru hole, PCTFE, Single - P-681

Price: £25.68


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English Threaded Adapter, 5/16-24 Flat-Bottom Female to 1/4-28 Flat-Bottom Male, 0.125" (3.20 mm), 96.6 μL, PCTFE, 1,000 psi (69 bar) - Single

Product Number: P-681

Categories: Connectors, English Threaded Adapters, Fluidic Connections, Threaded Adapters

This Upchurch Scientific / IDEX Health & Science / Biotech Fluidics versatile English Threaded Adapter is used specifically to attach connectors with different threads. It is made from inert PEEK giving it excellent chemical resistance. It has a Female 5/16-24 to Male 1/4-28 Flat-Bottom port configuration. It includes no fittings.

Available in the Following Configurations:

  • P-681 - Single pack
  • P-681C - 100 per pack

Threaded Adapters

Two of the many challenges researchers face regularly, are trying to use one style of fitting for all connections, or trying to join two different sizes of tubing. To assist in overcoming these challenges we have engineered one of the most extensive threaded adapter lines available.

Threaded Adapters come in a wide variety of configurations to meet your system requirements. They are designed to effectively bring together connectors with different threads. We offer them in English, Metric, and NPT versions. Manufactured from inert polymers and stainless steel they deliver excellent chemical resistance.

English Threaded Adapters

The versatile English Threaded Adapters are used specifically to securely attach connectors with different threads. We designed these adapters to work with English to English threaded geometries. Manufactured from Stainless Steel, PEEK, or Tefzel™ (ETFE), they deliver excellent solvent resistance.

Part No. Description Includes Thru-hole Swept Volume Pressure Rating
ENGLISH THREADED ADAPTERS
6000-076 PEEK Adapter, 5/16-24 C, M to 10-32 C, F N/A 0.066" (1.70 mm) 49.8 μL 3,000 psi (207 bar)
P-135 PEEK Adapter, 5/16-24 FB, F to 1/4-28 F N/A 0.080" (2.05 mm) 4.1 μL 1,000 psi (69 bar)
P-627 PEEK Adapter, 10-32 C, F to 1/4-28 FB, F (1) F-300 0.020” (0.50 mm) 0.30 μL 1,000 psi (69 bar)
P-681 PCTFE Adapter, 5/16-24 FB, F to 1/4-28 FB, M N/A 0.125" (3.20 mm) 96.6 μL 1,000 psi (69 bar)
P-684 PCTFE Adapter, 1/2-20 FB, F to 1/4-28 FB, M N/A 0.130" (3.30 mm) 121.7 μL 250 psi (17 bar)
P-718 PCTFE Adapter, 5/16-24 FB, M to 1/4-28 FB, F N/A 0.040" (1.00 mm) 10.3 μL 1,000 psi (69 bar)
U-659 PEEK Adapter, 5/16-24 FB, F to 1/2-20 FB, F (1) XU-655 Tapered** 42.0 μL 250 psi (17 bar)
U-665 PEEK Adapter, 1/2-20 FB, F to 1/4-28 FB, F (1) XU-655 0.063” (1.60 mm) 6.6 μL 250 psi (17 bar)
P-652 PEEK Adapter, 1/4-28 FB, F to 10-32 C, M N/A 0.030” (0.75 mm) 6.7 μL 1,000 psi (69 bar)
P-654 PEEK Adapter, 1/4-28 FB, F to 10-32 C, M, Extra Long N/A 0.030” (0.75 mm) 9.5 μL 1,000 psi (69 bar)
P-669-01 PEEK Adapter, 10-32 C, F to 1/4-28 FB, M N/A 0.040” (1.00 mm) 6.6 μL 1,000 psi (69 bar)
P-671 PTFE Adapter, 1/4-28 FB, F to 1/4-28 FB, M N/A 0.040” (1.00 mm) 8.0 μL 1,000 psi (69 bar)
P-672 PEEK Adapter, 1/4-28 FB, F to 10-32 FB, M N/A 0.050” (1.25 mm) 11.4 μL 1,000 psi (69 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: P-681
  • Manufactured by: Upchurch Scientific

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