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Heyco® Snap-In Romex® Strain
Relief Bushing*

Fit 1/2" Electrical Knock-out Hole

  • Part Numbers and Specifications
  • Features
WILL FIT THESE CABLES PANEL DIMENSIONS PART NO. DESCRIPTION SCREW
TYPE
CAD
Romex
Type
AWG/
Conds
Approximate
Size
A
Mounting
Hole Dia.
B
To Prevent
Rotation
Panel
Thickness
Black
in. mm. in. mm. in. mm. in. mm.
NM-B 14/2, 14/3,
12/2, 12/3,
10/2
up to .250 x .400 up to 6,4 x 10,2 .875 22,2 .770 19,6 .062 1,6 1726 USR-401 nylon CAD
.125 3,2

Standard color black. Consult Heyco for white and other colors.
*For Romex® and other flat cables.

  • USR 400 fits the widest range of cable sizes.
  • USR 401 fits the widest range of Romex® and other flat cable sizes.
  • Captive screw forces the locking flap against the cable.
  • Captive screw meets typical European requirements wherein the Strain Relief device must remain attached to the panel during cable removal or replacement.
  • Nylon USR 400 & 401 comply with:
    - IEC Publication #335
    - CEE #10 and # 11
  • Easy installation: fingertip pressure locks bushing into .875" (22,2 mm) diameter holes with panel thickness up to .125" (3,2 mm).
  • Reinforcing ribs for extra strength.
  • Bell mouth contour, radiused at 1.5x the exit hole diameter, eliminates the need for a separate cord guard.
  • Protect cables against forces of pull, push, twist, and flex.
  • Heyco-Tite Liquid Tight Romex Connectors.
  • For Double D Mounting Hole Punches, click here.

QuickSpecs

Material   Nylon 6/6
Certifications ru Recognized File E15331 for round and flat SPT type cables
ul Listed under Underwriters' Laboratories File E103540
csa Certified by the Canadian Standards Association File 81067
Flammability Rating   94V-2
Temperature Range   -.04°F (-18°C) to 221°F (105°C)
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