A 1.25-inch dimension equals 31.75 mm. Confirm which feature the supplier identifies with that size before choosing a rubber grommet.
Equipment and household openings do not share one universal size system. Measure the actual cutout, panel thickness and cable or tube dimensions. Compare the groove, flange and passage with the product drawing and tolerances.
If the opening is being made for a selected part, use its specified cutout dimensions. Confirm material suitability and any required sealing or cable retention separately. A size between two other catalog options is useful only when the complete specification fits.
