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“Stay Connected” with Strain Relief Bushings ® Heyco Original Strain Relief Bushings ® Straight-Thru for Round Cables .875˝ (22,2 mm) to 1.187˝ (30,1 mm) Mounting Holes Fit 1/2˝ or 3/4˝ Electrical Knock-out Hole Sizes • 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. • Sizes SR 7-Series to SR 9-Series for mounting hole diameters from .875˝ (22,2 mm) to 1.187˝ (28,6 mm). • Sizes for thin .062˝ (1,6 mm) panel available: SR 8N-2 See chart for details. • See page 4-38 for corresponding Mounting Hole Plugs which can be used to fill blank/unused Mounting Holes and thus allow for a single panel design for multiple applications. WILL FIT THESE CABLES UL Type AWG/ Conductors SJ, SJT & SJO PANEL DIMENSIONS Approximate Size in. mm. 16/2 .325 8,3 18/3 .330 8,4 14/2 .350 8,9 16/3 .355 9,0 18/4 .360 9,1 .875 22,2 SR 7K-2 .750 19,1 2509 .125 3,2 1271 SR 7KR-2 .750 19,1 2509 .875 22,2 .770 19,6 .125 3,2 1247 SR 7W-2 .750 19,1 2509 .200 5,1 1250 SR 7L-2 .750 19,1 consult Heyco .875 22,2 .840 21,3 .125 3,2 1497 SR 31-2 .812 20,6 2509 .875 22,2 .840 21,3 .062 1,6 1254 SR 8N-2 .828 21,0 2509 .125 3,2 .187 4,8 1260 1274 SR 8P-2 SR 8L-1 .812 20,6 .812 20,6 consult Heyco 1.000 25,4 .281 7,1 1287 SR 9P-2 1.000 25,4 See Schematic .370 9,4 12/3 .425 10,8 18/2 .390 9,9 S, SO, 18/3 .405 10,3 & ST 16/2 .405 10,3 16/3 .430 10,9 SJT .770 19,6 .125 3,2 Same as SR 7W-2 above except SJT • Consult Heyco for other wire types and sizes. • See pages 4-27 & 4-28 for SR assembly tools. • For Double D Mounting Hole Punches, see page 4-30. S & ST 12/3 .425.475 10,812,1 14/2 .530 13,5 14/3 .560 14,2 12/2 .600 15,3 Same as SR 8N-2 above except S 12/2 .600 15,2 12/3 .635 16,1 1.093 27,7 10/2 .640 16,3 1.093 27,7 .690 17,5 1.187 30,2 S, SO & ST 10/3 SRDT 10/4 C Hole Plug BODY LENGTH in. mm. PART NO. Black 1240 Same as SR 7K-2 above except 14/3 PART NO. DESCRIPTION PART DIM. Mounting A B Finished Mounting To Prevent Fit Panel Hole Dia. Rotation Thickness* in. mm. in. mm. in. mm. 2509 1.093 27,7 2717 Standard color black. Consult Heyco for white and other colors. *Maximum Panel Thickness. Part has additional clearance. Consult Heyco for your Custom Finished Fit Panel Thickness. B B .956 A A B A C .255 FOR SR-7KR-2 ONLY Quick Specs 4-21 Material Certifications Flammability Rating Temperature Range STANDARD MOUNTING HOLES ELONGATED MOUNTING HOLE Nylon 6/6 Recognized under the Component Program of Underwriters’ Laboratories File E15331 Certified by the Canadian Standards Association File 8919 94V-2 -.04°F (-18°C) to 221°F (105°C) 1-800-526-4182 • 732-286-1800 (NJ) • FAX: 732-244-8843 • www.heyco.com