Heyco® Strain Relief Bushings Selection Guide »
Heyco® Original Strain Relief Bushings
- Features
- Part Numbers and Specifications
Internal Radii for Flat Cables
.500" (12,7 mm) Mounting Holes
- Extra body length with flex-protecting internal radii.
- Wider approved wire range than typical 4-series Strain Reliefs; SR 4A-6 features a 1,0 mm locking slot for Thin Panels.
- Absorb forces of pull, push, and twist, to protect the electrical lifeline of your application.
- For maximum flex protection, see Bell-Mouth and Pigtail Strain Reliefs.
- Securely anchors, insulates and protects cables at panel entry points.
- To assemble SR 4A-6 use Part No. 0021 R 291 Pliers, designed for .040" (1,0 mm) panel thickness, or semi-automated equipment.
- To assemble SR 4N-6 and SR 4K-6, use Part No. 0022 R 29 Pliers, or semi-automated equipment.
- Use Mounting Holes Plug Part No. 2491 to standardize panel design where the Strain Relief is not required.
QuickSpecs
| Material | Nylon 6/6 | |
|---|---|---|
| Certifications |  |
Recognized under the Component Program of Underwriters' Laboratories File E15331 |
 |
Certified by the Canadian Standards Association File 8919 | |
| Flammability Rating | 94V-2 | |
| Material Temperature Index | 257°F (125°C)-maximum temperature on part not to exceed 221°F (105°C) |
| WILL FIT THESE CABLES | PANEL DIMENSIONS | PART NO. | DESC. | PART DIMENSIONS | Mounting Hole Plug |
CAD | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UL Type |
AWG/ Conductors |
Approximate Size |
A Mounting Hole Dia. |
B To Prevent Rotation |
Finished Fit Panel Thickness* |
Black | C HEAD LENGTH |
D BODY LENGTH |
|||||||||
| in. | mm. | in. | mm. | in. | mm. | in. | mm. | in. | mm. | in. | mm. | PART NO. | |||||
| SPT-1 | 18/3 | .12 x .30 | 3,0 x 7,6 | .500 | 12,7 | .465 | 11,8 | .040 | 1,0 | 1181 | SR 4A-6 | .270 | 6,9 | .546 | 13,9 | 2491 |  |
| SPT-2 & HPN |
18/2 | .15 x .28 | 3,8 x 7,1 | ||||||||||||||
| SPT-1 | 18/3 | .12 x .30 | 3,0 x 7,6 | .500 | 12,7 | .465 | 11,8 | .062 | 1,6 | 1187 | SR 4N-6 | .270 | 6,9 | .546 | 13,9 | 2491 | |
| SPT-2 & HPN |
18/2 | .15 x .28 | 3,8 x 7,1 | ||||||||||||||
| 16/2 | .16 x .30 | 4,1 x 7,6 | .515 | 13,1 | |||||||||||||
Same as SR 4AN-6 above except ––––––––––––––––––––––––––––> |
.100 | 2,5 | 1190 | SR 4K-6 | .270 | 6,9 | .546 | 13,9 | 2491 | |
|||||||
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.
