Rubber grommets: panel hole, panel thickness, ID, head diameter, height (Heyco inch, Essentra metric) + hole gauges

length

572.6 mm

width

79.5 mm

height

3.0 mm

Notes

• A rubber grommet is a bushing with a groove that seats in a round panel hole; the panel thickness it is made for is the groove width. Columns follow Heyco: panel thickness, mounting hole, ID (A, where the cable passes), head diameter (B, the flange) and overall height (C), each in inches / millimetres as printed. Heyco's standard colour is black and its thick-panel page says grommets are SBR unless noted (some parts are nitrile, neoprene, EPDM or PVC; the material column is not repeated here, so look it up by part number).
• Panels up to .063 in (1.6 mm) are one Heyco page; .125 / .156 / .188 in panels are a second page that was cross-checked against a distributor's copy of the same table; .250 and .375 in panels are a third page. The distributor copy printed some cells shifted by a row, so for the second page only cells where both copies print the same figure are shown (a '—' means the copies disagree or one is blank), and 0 row(s) whose ID differed between the copies were dropped (none). The first and third pages have one source each; one row was checked against McMaster-Carr: a 9/16 in hole in a 1/16 in panel with a 7/16 in ID and 3/4 in flange, 1/4 in high, matches Heyco G1123 (.44 ID, .75 head, .25 high).
• Left off the table: Heyco G1279 (made for a .257 in panel), the head and height cells that are blank on the Heyco page, and any part number outside these three tables. Hole size is the panel hole, not the grommet's OD: the groove of the grommet is a little larger than the cable and fits the hole, and the groove diameter is not printed on any page read.
• Metric: Essentra prints hole diameter, panel thickness, inside diameter, overall diameter (which it does not call the flange) and overall height for each item: 498062 is 5.0 hole / 1.0 panel / 2.0 ID / 8.0 / 4.0; 498088 is 11.0 / 1.0 / 8.0 / 16.0 / 6.0; 498094 is 12.0 / 3.0 / 8.0 / 16.0 / 8.0; 498108 is 18.0 / 2.0 / 12.0 / 22.0 / 7.0. These four are the items read, not the catalogue. The Essentra 'guide' page has no table. A separate datasheet for item 498071 reads 8 mm hole and 2 mm maximum panel but prints no ID or height, so it is not used. Metric and inch parts overlap in size but are not interchangeable.
• The gauges are plates with true-size holes at the published mounting-hole diameters (inch ×25.4); fit your panel hole to them before ordering. Plate size, 3 mm thickness, 8 mm spacing and 3 mm corner radius are Xem choices. McMaster-Carr sells many sizes with per-part STEP; this page links its 9/16 in grommet category and does not copy its files.

Rubber grommets: panel hole, panel thickness, ID, head diameter… size chart

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Free files

★ Free files 3 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

Plain text: sheet.txt · JSON: /api/geometry?object=rubber-grommets-panel-hole

Fits with

Free

Metric cable glands M12–M63: thread, panel hole (EN 60423), cable range, height, key size + hole gauge332.7×79.4×3.0 mm★ 1 fileFree

PG cable glands: thread and panel hole PG7–PG48 (DIN 40430), height, wrench flat, cable range + hole gauge276.1×63.4×3.0 mm★ 1 fileFree

Standard cable and plug sizes: USB-C, USB-A, Micro-B, Lightning, HDMI, RJ45, DC barrel, cable and power-cord diameters16 sizes★ 9 filesFree

Panel cutouts: IEC inlet, rockers, barrel jack, USB-C, HDMI, LEDs, Neutrik D11 sizes★ 10 filesFree

Rivet nuts (blind threaded inserts), flat head: hole size, grip range, body and flange dimensions, M3–M12 and #6-32 to 3/8-16131.7×32.1×3.0 mm★ 1 file