Heyco Strain Reliefs Split Panel

Material: Nylon 6/6


File E15331

File 8919

Flammability Rating: 94V-2

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

  • Designed to be installed in a split panel mounting hole or dropped into a slot.
  • Can be used for one wire or bundles of wire (round or flat wire).
  • Securely anchors, insulates and protects wire at panel entry points against the forces of pull, push, or twist.
  • Part 1266 is assembly friendly and self-locks onto the wire. It may be preassembled offline for final assembly at a later time or remote location, for lower installed cost and faster assembly. It has a unique wire locking ratchet that allows for a generous wire range from .250" to .600" (6,4 mm to 15,2 mm).
  • Part 1266 is UL recognized for multiple cables/conductors.
  • Part markings
Heyco® Split Panel Strain Relief Bushings
For Split Panel Mounting Holes
Will Fit These Cables Panel Dimensions Part Number UL/CSA
Body Length
UL Type
Approximate Size Mounting Hole Size Thickness
in. mm. in. mm. in. mm. Black White in. mm.
SO 14/4 .560 14,2 .825 21,0 .062 1,6 1263 SR 8R-2 .670 17,0
SO 12/3 .590 15,0
Round, Flat
or Multiple
Multiple up to .600 up to 15,2 .875 x .875 22,2 x 22,2 .100 2,5 1266 1267 SR 8R-200 .800 20,3