Heyco Products
Bushings and Plugs
Snub/Open/Closed Bushings | Shorty Bushings | Heyco Snap Bushings | Snap Bushings | Universal/Armor Bushings | Halogen-Free Hole Plug | Threaded Insulating Bushings | Flexible Grommetting | Metric Dome Plugs/Snap Bushings |
Dome Plugs | Halogen-Free Hole Plugs | Shorty/Double "D" Plugs | Window Plugs | Pry Out Plugs | Vent Plugs |
Liquid Tight Knock-Out Seals | Glossy Plugs | Feets of Strength | Adhesive Backed Bumpers

Help me Choose  HELP ME CHOOSE

Heyco® Straight-Thru Strain Relief Bushings 
Heyco® Straight-Thru Strain Relief Bushings Component Program of Underwriters Recognized under the Component Program of Underwriters' Laboratories File #E-15331
Canadian Standards Association Certified by Canadian Standards Association File #LR-8919
 

For flat cables, with flex-protecting internal radii
 
Swipe
WILL FIT THESE CABLES CHASSIS DIMENSIONS   UL/CSA
Desc
 
UL TYPE
Designation
AWG
Conductors
Approx
Size
A
Mounting
Hole
B
To Prevent
Rotation
Maximum
Thickness
PART NO. D
Part
Length
in.   mm. in.    mm. in.   mm. in.    mm. Black White in.    mm.
SPT-1 18/3 .12x.30 3,0x7,6 .500  12,7 .465  11,8 .040 *  1,0 1181 1182 SR 4A-6 .546  13,9
SPT-2 & HPN 18/2 .15x.28 3,8x7,1
SAME AS SR 4A-6 ABOVE EXCEPT -----> .062  1,6 1187 1188 SR 4N-6
.100  2,5 1190 1191 SR 4K-6
Standard Color: Black. White and others available at extra charge (only in large quantities).
* To install Strain Reliefs for .040"(1,0 mm) maximum chassis thickness, use Part #0021 (No. R-291) Hand Plier


For flat cables, with flex-protecting internal radii
 
Swipe
WILL FIT THESE CABLES CHASSIS DIMENSIONS   UL/CSA
Desc
 
UL TYPE
Designation
AWG
Conductors
Approx
Size
A
Mounting
Hole
B
To Prevent
Rotation
Maximum
Thickness
PART NO. D
Part
Length
in.   mm. in.    mm. in.   mm. in.    mm. Black White in.    mm.
CLOCK 20/2 .09x.18 2,3x4,6 .375  9,5 .345  8,8 .062  1,6 1017 1018 SR 2P-4 .406  10,3
STP-1 18/2 .11x.21 2,8x5,3
SAME AS SR 3A-4 ABOVE EXCEPT -----> .125  3,2 1034 1035 SR 2L-1
SPT-1 18/2 .12x.22 3,0x5,6 .437  11,1 .390  9,9 .040*  1,0 1074 1075 SR 3A-4
SAME AS SR 3A-4 ABOVE EXCEPT -----> .062  1,6 1077 1078 SR 3P-4
.100 2,5 1104 1105 SR 3W-1
.156  4,0 1094 1095 SR 3L-1
SPT-1 18/2 .12x.22 3,0x5,6 .50  12,7 .445  11,3 .100  2,5 1130 1131 SR 4P-4 .453  11,5
SPT-1 18/3 .12x.30 3,0x7,6 .500  12,7 .465  11,8 .062  1,6 1120 1121 SR 4N-4 .406  10,3
HPN 18/2 .15x.28 3,8x7,1
SAME AS SR 4N-4 ABOVE EXCEPT -----> .100  2,5 1117 1118 SR 4K-4
.156  4,0 1127 1128 SR 4L-4
SPT-1 18/3 .12x.30 3,0x7,6 .500  12,7 .450  11,7 .095  2,4 1114 1115 SR 4K-1 .50  12,7
SPT-2 & HPN 18/2 .15x.28 3,8x7,1
HPN 18/3 .15x.34 3,8x8,6 .50-  12,7
.515  13,1
SPT-2 & HPN 16/2 .16x.30 4,1x7,6
SAME AS 4K-1 ABOVE EXCEPT -----> .187  4,7 1124 1125 SR 4L-1
SPT-3 18/2 .19x.35 4,8x8,9 562  14,3 .530  13,5 .062  13,5 1170 1171 SR 5KN-4 .609  15,5
16/2 .20x.37 5,1x9,4
SPT-2 18/3 .15x.40 3,8x10,2
16/3 .16x.41 4,1x10,4
SAME AS SR 5KN-4 ABOVE EXCEPT -----> .125  3,2 1167 1168 SR 5K-4
SPT-2 18/3 .15x.40 3,0x7,6 .625  15,9 .550  14,0 .062  1,6 1160 1161 SR 6N-4 .406  10,3
16/3 .16x.41 4,1x10,4
SAME AS 6N-4 ABOVE EXCEPT -----> .125  2,5 1163 1164 SR 6PN-4
Standard Nylon Fastener Color: Black. White and others available at extra charge (only in large quantities).
* To install Strain Reliefs for .040"(1,0 mm) maximum chassis thickness, use Part #0021 (No. R-291) Hand Plier
  • Protects the lifeline of your electric/electronic products by absorbing the forces of pull, push and twist that may be exerted on the flexible power cord.
  • Securely anchors, insulates and protects cables at chassis entry points.
  • New sizes for narrow .040" (1,0mm) chassis available:
                                                                SR 3A-4          
                                                                SR 4A-6
    See charts for details.
  • Standardize panel design!  Fill unneeded SR mounting holes with Heyco Double D Plugs, page 3-17.
  • Molded of type 6/6 nylon.  ASTM D-4066; flammability classification 94V-2; temperature index 125°C.  Maximum temperature on the part shall not exceed 105°C.
    Click here to see our guide on choosing the best strain relief for your application.
Heyco® Straight-Thru Strain Relief Bushings

Our website uses cookies. For more information on our cookie use, see our Privacy Policy. By continuing to use this website you agree to our use of these cookies.