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Bushings and Plugs

Heyco® Straight-Thru Strain Relief Bushings

Recognized under the Component Program of Underwriters' Laboratories File #E-15331

Certified by Canadian Standards Association File #LR-8919

For flat cables, with flex-protecting internal radii

Click on one of the green links below to download a CAD Drawing of this product.

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

Click on one of the green links below to download a CAD Drawing of this product.

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.