Heyco Conduit, Tubing & Fittings Heyco-Flex™ III Liquid Tight Conduit Fittings - Straight-Thru, NPT Hubs
Flex III Conduit Fitting

Material: Nylon 6/6


Certified to both Canadian and US Requirements File E121095

Flammability Rating: 94V-2

Material Temperature Index: 125°C (257°F)–Max. temperature on part not to exceed 105°C (221°F)

Ingress Protection Rating: IP 64

  • For use with Heyco-Flex™ III Corrugated tubing in trade sizes 3/8" through 1".
  • Non toxic and UV resistant.
  • Rated for NEMA 4 and 4X applications when used with Heyco-Flex™ III Tubing.
  • Rated for NEMA Type 3R applications.
  • Easy, permanent assembly. The installer simply pushes the tubing over the connector ferrule until the tubing "clicks" into place.
  • Lightweight and lower installed cost.
  • Quick and easy installation.
  • Suitable for use in high vibration or flexing applications (automotive equipment, fiber optics, computer and peripherals, lab equipment, robotics, etc.)
  • Resists salt water, weak acids, gasoline, alcohol, oil, grease and common solvents. This feature is not assessed by UL certification or testing.
  • For use in both wet and dry applications.
  • If using a tapped hole, Teflon® tape is needed on the threads of the connector, for all other applications an O-ring and Locknut are needed to attain liquid tight.
  • Use of an O-ring may be required for a complete liquid-tight system with a non-threaded mounting hole.
  • Supplied with locknuts; packed separately.
  • Patented.
Heyco-Flex III Liquid Tight Conduit Fittings
Straight-Thru, NPT Hubs
For Flexible, Nonmetallic Liquid Tight Tubing
Fits Tubing Trade Size Part
Description Thread
Part Dimensions (Optional)
Part No.
Clearance Hole
Max O.A Length
Thread Length
Wrenching Nut Thk.
Wrenching Flats
Black in. mm. in. mm. in. mm. in. mm. in. mm.
3/8 9146 HF3C 3/8 1/2 NPT   .875 22,2 1.72 43,7 .63 16,0 .20 5,1 1.16 29,5 1995
1/2 9147 HF3C 1/2
3/4 9148 HF3C 3/4 3/4 NPT 1.109 28,2 1.84 46,7 .63 16,0 1.36 34,5 1996
1 9149 HF3C 1 1 NPT 1.375 34,9 1.99 50,6 .78 19,8 1.62 41,1 1997

Sealing Washers

Material: Buna-N (Nitrile Rubber NBR)

Operating Temperature Range: -34°C to 100°C (-30°F to 212°F)

Maximum Temperature Rating: 121°C (250°F)

  • For use with Heyco-Flex™ Fittings mounted in non-threaded holes.
  • Liquid tight, dust tight and oil tight at enclosure.
  • Suitable for wet locations requiring a separate gasket between the fitting and enclosure.
  • Resistant to petroleum oil, mineral oil, and grease, diesel fuel, weak acids, alkali, and salt solutions.
Heyco® Thermoplastic Rubber O-Rings
Will Fit These
Trade Sizes
Description Part Dimensions
Inside Diameter
Outside Diameter
Black in. mm. in. mm. in. mm.
1/2 1995 ROR 1/2   .860 21,8 1.140 28,9 .140 3,5
3/4 1996 ROR 3/4 1.050 26,7 1.320 33,5
1 1997 ROR 1 1.300 32,9 1.570 39,9