JIC Threads for Flare & Uno - Fitting Sizes & Dimensions

JIC 37° Flare & Uno (O Ring Boss) Threads

  • JIC is JOINT INDUSTRIES COUNCIL – SAE J514, ISO 8434-2
  • UN is UNIFIED NATIONAL – SAE J1926, ISO 11926-2

JIC & UNO (O Ring Boss) thread forms are the same (ASME B1.1). Method of sealing differs.

JIC male has 37° flare which seals against 37° seat in female.
JIC male can also seal against 37° flared tubing with JIC nut and sleeve.

JIC male can also be used with RYCO S134 J-Lok Female Nut and Flareless Olive on Imperial OD tubing.

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UNO (O Ring Boss) seals with O Ring compressed between hex boss of UN male and 12°/15° tapered bore of UN (O Ring Boss) female port. For elbows and tees, Backup Washer and Lock Nut allow orientation of fitting to required direction.

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MALE THREAD
OD & PITCH
DASH
SIZE
MALE
THREAD OD
FEMALE
THREAD ID
TUBESIZE
inch – TPI mm inch mm inch inch
5/16 – 24 UNF -05 7,9 0.31 6,9 0.27 1/8
3/8 – 24 UNF -06 9,5 0.38 8,5 0.33 3/16
7/16 – 20 UNF -07 11,1 0.44 9,9 0.39 1/4
1/2 – 20 UNF -08 12,7 0.50 11,4 0.45 5/16
9/16 – 18 UNF -09 14,3 0.56 13,0 0.51 3/8
3/4 – 16 UNF -12 19,1 0.75 17,5 0.69 1/2
7/8 – 14 UNF -14 22,2 0.88 20,3 0.80 5/8
1.1/16 – 12 UN -17 27,0 1.06 24,9 0.98 3/4
1.3/16 – 12 UN -19 30,2 1.19 28,2 1.11 7/8
1.5/16 – 12 UN -21 33,3 1.31 31,2 1.23 1
1.5/8 – 12 UN -26 41,3 1.63 39,1 1.54 1.1/4
1.7/8 – 12 UN -30 47,6 1.88 45,5 1.79 1.1/2
2.1/2 – 12 UN -40 63,5 2.50 61,5 2.42 2