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Heyco® Straight-Thru Strain Relief Bushings
For Round Cables		 Features
  • Sizes SR7 to SR9 for mountin hole diameters from .750˝ (19,0 mm) to 1.187˝ (28,6 mm).
  • 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 panel entry points.
  • Standardize panel design! Fill unneeded SR mounting holes with Heyco Double “D” Plugs.
  • Sizes for thin .062˝ (1,6 mm) panel available:
    SR 7N-2 & SR 8N-2. See chart for details.
  • SR hole punches and assembly tools.
  • Quick Specs

Heyco® Straight-Thru Strain Relief Bushings
For Round Cables		 Specifications
WILL FIT THESE CABLES
PART DIMENSIONS
PART NO.
Black
 Descr. C
Body
Length		 CAD
UL Type
Designat.		 AWG/
Conduc.		 Approx.
Size
A
Moun.
Hole Dia.
B
Prevent
Rotation
 Max.
Panel
Thickness
in. mm.
in.
mm.
in.
mm.
 in. mm. in. mm.
SJT 18/4
14/3		 .360
.370		 9,1
9,4		 ..750 19,0 .660 16,8 .062 1,6 1244 SR 7N-2 .750 19,1
S & ST 18/2
18/3
16/2		 .309
.405
.405		 9,9
10,3
10,3
16/3 .430 10,9 .750-.781 19,0
19,8
Same as SR 7N-2 above except .125 3,2 1237 SR 7P-2 .750 19,1
SJ, SJT
& SJO		 16/2
18/3
14/2
16/3
18/4		 .325
.330
.350
.355
.360		 8,3
8,4
8,9
9,0
9,1		 .875 22,2 .770 19,6 .125 3,2 1240 SR 7K-2 .750 19,1
Same as SR 7K-2 above except See Schematic 1271 SR 7KR-2 .750 19,1
SJT 14/3
12/3		 .370
.425		 9,4
10,8		 .875 22,2 .770 19,6 .125 3,2 1247 SR 7W-2 .750 19,1
S & ST 18/2
18/3
16/2
16/3		 .390
.405
.405
.430		 9,9
10,3
10,3
10,9
Same as SR 7W-2 above except .200 5,1 1250 SR 7L-2 .750 19,1
SJT 12/3 .425-.475 10,8-12,1 .875 22,2 .840 21,3 .125 3,2 1497 SR 31-2 .812 20,6
S & ST 14/2
14/3
12/2		 .530
.560
.600		 13,5
14,2
15,3		 .875 22,2 .840 21,3 .062 1,6 1254 SR 8N-2 .828 21,0
Same as SR 8N-2 above except .125 3,2 1260 SR 8P-2 .812. 20,6
,187 4,8 1274 SR 8L-1
S 12/2
12/3
10/2		 .600
.635
.640		 15,2
16,1
16,3		 1.093
1.125
1.093		 27,7
28,6
27,7		 1,000 25,4 .281 7,1 1287 SR 9P-2 1.00 25,4
S, ST
& SO		 10/3 .690 17,5 1.187 28,6

Standard color black. Consult Heyco for white and other colors.
1Maximum Panel Thickness–Part has additional clearance.



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