# Heyco strain relief bushings (SR series): mounting hole, to-prevent-rotation dimension, panel thickness, body length and cable range

> What panel hole does a Heyco strain relief bushing need, and what panel thickness and cable does it take?

- Category: Electronic components › Panel cutouts
- Kind: Standard part
- Basis: Heyco's flat-cable strain relief page (read in full), Heyco's round-cable sheet as hosted by Mouser (cross-checked against two distributor copies), and the sheet for the SR 5P3-4; numbers only
- Page: https://xemstudio.com/objects/heyco-strain-relief-bushings/ · JSON: https://xemstudio.com/api/geometry?object=heyco-strain-relief-bushings · Plain text: https://xemstudio.com/objects/heyco-strain-relief-bushings/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

**Exact dimensions.** True size, with no tolerance added.

## Notes

- Columns follow Heyco's sheets: A is the mounting hole diameter, B the 'to prevent rotation' dimension, 'finished fit panel thickness' (the thickest panel the groove is made for; the sheets say the part has additional clearance and custom thicknesses are available), C the body length, and the hole plug part number. Dimensions are inches with mm in brackets as printed. Material is nylon 6/6, rated −18 to 105 °C, standard colour black, per the flat-cable page.
- What B means: the sheets give the hole diameter and the 'to prevent rotation' figure but do not describe the hole as round or D-cut in the text read. For the SR 30-1 the sheet says to use an elongated mounting hole (the printed B of .730 in exceeds the .560 in A, as for the SR 33-1's .875 in vs .750 in), so B is shown as printed and not interpreted. No panel-hole shape is drawn.
- Cable range: the layout of the round-cable sheets is flattened in the copies read, so cable OD columns are partly unreadable (upper limits of SR 2M-1 and SR 5MN-3, the lower limit of others). Only cable entries on which the copies agree are shown; use Heyco's page for the full table. Rows left out: SR 5L-1 (1154), SR 30-1A / 30-1B (1487 / 1490), thin-panel parts (SR 4A-6, SR 3A-4 and the other .040 in panel sizes) and the many part numbers with no readable dimensions. For the SR 6P4-4 (1163) the sheet prints a panel thickness of .125 in but 2.5 mm; the inch value is shown and the sheet's own mismatch noted.
- Rubber grommets from the same maker are on rubber-grommets-panel-hole, and cable glands on cable-glands-pg-thread and cable-glands-metric-thread. No file: the bushing's outline is not published as numbers in a source read. Heyco publishes CAD for its parts on its site; linked, not copied.

## Sizes

| Heyco body no. | type | mounting hole A in (mm) | to prevent rotation B in (mm) | panel thickness in (mm) | body length C in (mm) | hole plug | cable as printed |
|---|---|---|---|---|---|---|---|
| 1060 | SR 2M-1 | .375 (9.5) | .330 (8.4) | .062 (1.6) | .406 (10.3) | 2617 | AWM 12/1; the upper limit of the cable OD is unreadable in the copies |
| 1157 | SR 5MN-3 | .500 (12.7) | .450 (11.4) | .062 (1.6) | .438 (11.1) | 2491 | SV & SVT 18/2: from .220 (5.6) up (upper limit unreadable in one copy; .245 / 6.2 in the other) |
| 1140 | SR 5M-3 | .500 (12.7) | .450 (11.4) | .100 (2.5) | .438 (11.1) | 2491 | as SR 5MN-3, different panel thickness |
| 1150 | SR 5N-4 | .500 (12.7) | .450 (11.4) | .062 (1.6) | .438 (11.1) | 2491 | HPD 18/2: .270 (6.9) |
| 1147 | SR 5P-4 | .500 (12.7) | .450 (11.4) | .100 (2.5) | .438 (11.1) | 2491 | as SR 5N-4, different panel thickness |
| 1137 | SR 5P3-4 | .500 (12.7) | .450 (11.4) | .100 (2.5) | .438 (11.1) | 2491 | SV & SVT 18/3: .255 – .270 (6.5 – 6.9) per the sheet for 1137 (that sheet's layout is garbled; confirm with Heyco) |
| 1184 | SR 6W-1 | .500 (12.7) | .465 (11.8) | .090 (2.3) | .438 (11.1) | 2491 | SJ, SJT, SJO 18/2 and SPT-3 16/2: .300 (7.6) |
| 1170 | SR 5KN-4 | .562 (14.3) | .530 (13.5) | .062 (1.6) | .609 (15.5) | 2494 | flat: SPT-3 18/2 .19 × .35 (4.8 × 8.9); SPT-3 16/2 .20 × .37 (5.1 × 9.4); SPT-2 18/3 .15 × .40; 16/3 .16 × .41 |
| 1174 | SR 5W-1 | .562 (14.3) | .530 (13.5) | .125 (3.2) | .609 (15.5) | 2494 | flat: SPT-2 18/3 .15 × .40 (3.8 × 10.2); 16/3 .16 × .41 (4.1 × 10.4); HPN 16/2 .16 × .37 (4.1 × 9.4) |
| 1167 | SR 5K-4 | .562 (14.3) | .530 (13.5) | .125 (3.2) | .609 (15.5) | 2494 | flat: same cables as 1170 |
| 1160 | SR 6N4-4 | .625 (15.9) | .550 (14.0) | .062 (1.6) | .578 (14.7) | 2497 | flat: SPT-2 18/3 and 16/3 |
| 1163 | SR 6P4-4 | .625 (15.9) | .550 (14.0) | .125 (3.2 (printed 2.5 mm: sheet disagrees with itself)) | .578 (14.7) | 2497 | flat: same cables as 1160 |
| 1504 | SR 33-1 | .750 (19.0) | .875 (22.2) | .125 (3.2) | .781 (19.8) | consult Heyco | flat: SPT-3 16/2 to 14/3 (.20 × .37 to .24 × .51) |
| 1517 | SR 34-2 | .875 (22.2) | .840 (21.3) | .125 (3.2) | .813 (20.7) | 2509 | flat: SPT-3 14/2 to 12/3 (.24 × .42 to .29 × .65) |
| 1497 | SR 31-2 | .875 (22.2) | .835 (21.2) | .125 (3.2) | .812 (20.6) | 2509 | flat: SPT-3 12/3 (.32 × .65) and 10/3 |
| 1484 | SR 30-1 | .560 (14.2) | .730 (18.5) | .125 (3.2) | .672 (17.1) | consult Heyco | flat: SPT-3 18/2 .19 × .35 to 16/3 .20 × .43; sheet says use the elongated mounting hole |

## Where the files are

- Heyco: [Original strain relief bushings, straight-thru for flat cables, .560 / 14.2 mm to .875 / 22.2 mm mounting holes (maker's page; the maker also provides CAD)](https://www.heyco.com/products/strain-relief-bushings/original-strain-reliefs/heyco-original-strain-relief-bushings-straight-thru-for-flat-cables-560-142-mm-to-875-222-mm-mounting-holes) — web — Maker page; numbers only
- Heyco (datasheet hosted by Mouser): [Original strain relief bushings, round cable, .375 to .500 in mounting holes](https://www.mouser.com/datasheet/2/184/Original_Strain_Relief_Round_1-1133253.pdf) — web — Maker datasheet; numbers only
- IEWC (distributor copy of the Heyco sheet for 1137): [Heyco SR 5P3-4 (1137) spec sheet](https://media.iewc.com/SpecificationSheets/1137.pdf) — web — Distributor copy of the maker sheet; numbers only
- H. Weckhardt (copy of the Heyco round-cable sheet): [Heyco Original strain relief bushings round cable (cross-check)](https://www.hweckhardt.com/images/pdf/data/Heyco Original Strain Relief Bushings Round Cable.pdf) — web — Distributor copy of the maker sheet; numbers only

## Questions

**What hole does a Heyco SR 5P-4 strain relief need?**

A 0.500 in (12.7 mm) mounting hole, 0.450 in (11.4 mm) 'to prevent rotation' dimension, for a panel up to 0.062 in (1.6 mm) thick; the SR 5P-4 (1147) in Heyco's table is the 0.100 in (2.5 mm) panel version of the SR 5N-4 (1150).

**Is the hole round or D-shaped?**

The Heyco sheets read give a hole diameter A and a 'to prevent rotation' dimension B and do not say D-cut in the text; Heyco's note for the SR 30 parts says use an elongated mounting hole. Check Heyco's drawing for the part.

## Fits with

- [Rubber grommets: panel hole, panel thickness, ID, head diameter, height (Heyco inch, Essentra metric) + hole gauges](https://xemstudio.com/objects/rubber-grommets-panel-hole/)
- [PG cable glands: thread and panel hole PG7–PG48 (DIN 40430), height, wrench flat, cable range + hole gauge](https://xemstudio.com/objects/cable-glands-pg-thread/)
- [Metric cable glands M12–M63: thread, panel hole (EN 60423), cable range, height, key size + hole gauge](https://xemstudio.com/objects/cable-glands-metric-thread/)
- [Standard cable and plug sizes: USB-C, USB-A, Micro-B, Lightning, HDMI, RJ45, DC barrel, cable and power-cord diameters](https://xemstudio.com/objects/cable-and-plug-sizes/)
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