Material: 6/6 Nylon

Certifications:

File E15331

File 8919

Flammability Rating: 94V-2

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

Protects the lifeline of your electric/electronic products by absorbing the forces of push, pull and twist that may be exerted on the flexible power cord.
Securely anchors, insulates, and protects cable at panel entry points.
Sizes for thinner panels .040" (1,0 mm) are available: SR 4A-6 and SR 3A-4. See table below for details.
Fill blank/unused mounting holes with Heyco Double D Plugs.
See below for assembly tool and installation instructions.
Heyco nylon strain reliefs are also available in Labkit #1. This handy compartmentalized box provides a working assortment for prototype use in design and engineering groups.
Part markings

Heyco^® Straight-Thru Strain Relief Bushings
For Flat Cable, with Flex-Protecting Internal Radii and Extra Body Length
Will Fit These Cables				Panel Dimensions						Part Number		UL/CSA Designation	Part Dimensions
UL Type Designation	AWG/ Conductors	Approximate Size		A Mounting Hole Diameter		B To Prevent Rotation		Finished Fit Panel Thickness		Color			C Body Length
UL Type Designation	AWG/ Conductors	in.	mm.	in.	mm.	in.	mm.	in.	mm.	Black	White		in.	mm.
SPT-1	18/3	.12 x .30	3,0 x 7,6	.500	12,7	.465	11,8	.040	1,0	1181	1182	SR 4A-6	.546	13,9
SPT-2 & HPN	18/2	.15 x .28	3,8 x 7,1	.500	12,7	.465	11,8	.040	1,0	1181	1182	SR 4A-6	.546	13,9
Same as SR 4A-6 above except								.062	1,6	1187	1188	SR 4N-6	.546	13,9
Same as SR 4A-6 above except								.100	2,5	1190	1191	SR 4K-6	.546	13,9

Heyco^® Original Strain Relief Bushings
Straight-Thru for Flat Cable
Will Fit These Cables				Panel Dimensions						Part Number		UL/CSA Designation	Part Dimensions
UL Type Designation	AWG/ Conductors	Approximate Size		A Mounting Hole Diameter		B To Prevent Rotation		¹ Finished Fit Panel Thickness		Color			C Body Length
UL Type Designation	AWG/ Conductors	in.	mm.	in.	mm.	in.	mm.	in.	mm.	Black	White		in.	mm.
CLOCK	20/2	.09 x .18	2,3 x 4,6	.375	9,5	.345	8,8	.062	1,6	1017	1018	SR 2P-4	.406	10,3
SPT-1	18/2	.11 x .21	2,8 x 5,3	.375	9,5	.345	8,8	.062	1,6	1017	1018	SR 2P-4	.406	10,3
Same as SR 2P-4 above except								.125	3,2	1034	1035	SR 2L-1	.406	10,3
SPT-1	18/2	.12 x .22	3,0 x 5,6	.437	11,1	.390	9,9	.040	1,0	1074	1075	SR 3A-4	.406	10,3
Same as SR 3A-4 above except								.062	1,6	1077	1078	SR 3P-4	.406	10,3
								.100	2,5	1104	1105	SR 3W-1	.406	10,3
								.156	4,0	1094	1095	SR 3L-1	.406	10,3
SPT-1	18/2	.12 x .22	3,0 x 5,6	.500	12,7	.445	11,3	.100	2,5	1130	1131	SR 4P-4	.440	11,2
SPT-1	18/3	.12 x .30	3,0 x 7,6	.500	12,7	.465	11,8	.062	1,6	1120	1121	SR 4N-4	.406	10,3
HPN	18/2	.15 x .28	3,8 x 7,1	.500	12,7	.465	11,8	.062	1,6	1120	1121	SR 4N-4	.406	10,3
Same as SR 4N-4 above except								.100	2,5	1117	1118	SR 4K-4	.406	10,3
Same as SR 4N-4 above except								.156	4,0	1127	1128	SR 4L-4	.406	10,3
SPT-1	18/3	.12 x .30	3,0 x 7,6	.500	12,7	.460	11,7	.095	2,4	1114	1115	SR 4K-1	.500	12,7
SPT-2 & HPN	18/2	.15 x .28	3,8 x 7,1	.500	12,7
HPN	18/3	.15 x .34	3,8 x 8,6	.500- .515	12,7- 13,1
SPT-2 & HPN	16/2	.16 x .30	4,1 x 7,6	.500- .515	12,7- 13,1
Same as SR 4K-4 above except								.187	4,7	1124	1125	SR 4L-1	.500	12,7
SPT-3	18/2 16/2	.19 x .35 .20 x .37	4,8 x 8,9 5,1 x 9,4	.562	14,3	.530	13,5	.062	1,6	1170	1171	SR 5KN-4	.609	15,5
SPT-2	18/3 16/3	.15 x .40 .16 x .41	3,8 x 10,2 4,1 x 10,4	.562	14,3	.530	13,5	.062	1,6	1170	1171	SR 5KN-4	.609	15,5
Same as SR 5KN-4 above except								.125	3,2	1167	1168	SR 5K-4	.609	15,5
SPT-2	18/3 16/3	.15 x .40 .16 x .41	3,0 x 7,6 4,1 x 10,4	.625	15,9	.550	14, 0	.062	1,6	1160	1161	SR 6N4-4	.578	14,7
Same as SR 6N4-4 above except								.125	2,5	1163	1164	SR 6P4-4	.578	14,7
HPN & SPT-2	16/3 18/3 16/3	.16 x .37 .15 x .40 .16 x .41	4,1 x 9,4 3,8 x 10,2 4,1 x 10,4	.562	14,3	.530	13,5	.125	3,2	1174	1175	SR 5W-1	.609	15,5
SPT-2	18/3 16/3	.15 x .40 .16 x .41	3,8 x 10,2 4,1 x 10,4	.560	14,2	.730	18,5	.125	3,2	1484	1485	SR 30-1^{* *}	.672	17,1
SPT-3	18/2 18/3 16/2 16/3	.19 x .35 .19 x .39 .20 x .37 .20 x .43	4,8 x 8,9 4,8 x 9,9 5,1 x 9,4 5,1 x 10,9	.560	14,2	.730	18,5	.125	3,2	1484	1485	SR 30-1^{* *}	.672	17,1
SPT-3	16/2 16/3 14/2 14/3	20 x .37 .20 x .43 .24 x .42 .24 x .51	5,1 x 9,4 5,1 x 10,9 6,1 x 10,7 6,1 x 13,0	.750	19,1	.875	22,2	.125	3,2	1504	1505	SR 33-1^{* *}	.781	19,8
SPT-3	14/2 14/3 12/2 12/3	.24 x .42 .24 x .51 .29 x .51 .29 x .65	6,1 x 10,7 6,1 x 13,0 7,4 x 13,0 7,4 x 16,5	.875	22,2	.840	21,3	.125	3,2	1517	1518	SR 34-2	.813	20,7
SPT-3	12/3 10/3	.32 x .65	8,1 x 16,5	.875	22,2	.840	21,3	.125	3,2	1497	1498	SR 31-2	.813	20,7
300 OHM^†	-	.06 x .40	1,5 x 10,2	.375	9,5	.625- .640	15,9- 16,3	.156	4,0	1804	1805	SR 300-1^{* *}	.469	11,9
SPT-1	18/3	.12 x .30	3,0 x 7,6	.375 .390	9,5 9,9
SPT-2	18/3	.15 x .40	3,8 x 10,2	.415 .422	10,5 10,7
SPT-2	16/3	.16 x .41	4,1 x 10,4	.422 .437	10,7 11,1
Same as SR 300-1 above except								.100	2,5	1814	1815	SR 302-1^{* *}	.469	11,9

¹ Maximum Panel Thickness–Part has additional clearance.
^{* *} Use Elongated Hole.
^†Wire is not UL/CSA Covered.

Labkit #1

An assortment of nylon strain reliefs may also be found in Heyco Labkit #1. Labkits contain an assortment of the most common sizes and are ideal for product design and engineering departments.

Heyco^® Strain Reliefs
(Part #1999)

Position Heyco strain relief bushing on wire.

Squeeze pliers or activate air tool.

Push Heyco strain relief into panel hole.

Choose the appropriate assembly tool for your application.

Labkit #1

Heyco® Strain Reliefs (Part #1999)

Heyco^® Strain Reliefs
(Part #1999)