Heyco Conduit, Tubing & Fittings Quick Twist Fittings - Straight, NPT Thread
Quick Twist Straight Fitting

Material: Nylon 6/6


File E28430

File E121095

Flammability Rating: 94V-2

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

  • One-piece solution with smooth internal surfaces provides for easy wire routing, protection and installation.
  • Easy, permanent assembly; the installer twists the tubing over the connector ferrule.
  • NPT Threaded fittings are UL approved for use with Heyco-Flex I conduit and Heyco Flex II tubing.
  • All nylon construction is resistant to salt water, weak acids, gasoline, alcohol, oil, grease and other common solvents. This feature is not assessed by UL certification and testing.
  • Suitable for a wide array of electrical applications:
    • Commercial and Industrial HVAC systems
    • Motorized Equipment
    • Enclosed Power Sources
    • Garage Door Openers
    • Major Appliances
  • 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 a liquid tight connection.
  • Locknuts are NOT included, but are available separately.
  • Use finishing collars to neaten rough cut tubing ends.
  • Assembly tool available for assembling Quick Twist Fittings into HF1 and HF2 Conduit and Tubing.
Heyco-Flex Quick Twist Liquid Tight Conduit Fittings
Straight-Thru, NPT Hubs
For use with Heyco-Flex I and II Conduit and Tubing
Conduit / Tubing
Trade Size
Part Number Description Thread Size or Part Dimensions
Color A
Clearance Hole
Max O.A Length
Thread Length
Wrenching Nut Thk.
Wrenching Flats
Black Gray in. mm. in. mm. in. mm. in. mm. in. mm.
1/4 8517 8518 HFC 1/4 Twist 1/4 NPT   .540 13,7 1.559 39,6 .465 11,8 .20 5,1   .75 19,1
3/8 8487 8488 HFC 3/8 Twist 1/2 NPT   .875 22,2 1.720 43,7 .625 15,9 1.18 30,0
1/2 8493 8494 HFC 1/2 Twist 1/2 NPT
3/4 8497 8498 HFC 3/4 Twist 3/4 NPT 1.109 28,2 1.840 46,7 1.37 34,8

Finishing Collars
Heyco-Flex™ Quick Twist Finishing Collars
For Use with Heyco-Flex™ I and II Conduit Fittings
Fits Conduit /
Trade Size
Part Number Description
Black Gray
3/8 8474 8482 HFC Twist 3/8 Collar
1/2 8475 8483 HFC Twist 1/2 Collar
3/4 8476 8484 HFC Twist 3/4 Collar