PEEK Fingertight Nuts for Flangeless 1/4-28 Connections

PEEK flangeless nut
  • Compatible with all 1/4-28 flat-bottom ports
  • Excellent chemical resistance
  • For 1/16" or 1/8" OD tubing
  • True fingertight - no tools required

PEEK flangeless nuts in combination with our inverted ferrule do not a require flanging tool. A hand-tightening procedure makes leak-free seals.

With this fitting system, the inert ETFE ferrule is the only part besides the tubing which comes into contact with the fluid stream - the nut is never in contact.

Ferrules are not included. Order separately.

Tubing OD Description Qty/pkg Product No.
1/16" Nut PEEK flangeless nut 10 JR-20124-10
Ferrule inverted ferrule 10 JR-041-10
1/8" Nut PEEK flangeless nut 10 JR-20116-10
Ferrule inverted ferrule 10 JR-051-10


  • For 1/16" and 1/8" OD tubing
  • Material
      Nuts: PEEK
      Ferrules: ETFE
  • 1/4-28 threads
  • Pressure rating (varies with tubing material and ID)
    OD Bar Psi
    1/16" 105 1500
    1/8" 35 500


The inert ETFE ferrule used with this nut is the only part besides the tubing which is in contact with the fluid stream.