back nut

back nut

[′bak ‚nət]
(design engineering)
A threaded nut, one side of which is dished to retain a grommet; used in forming a watertight pipe joint.
A locking nut on the shank of a pipe fitting, tap, or valve.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

back nut

1. A threaded nut, one side of which is dished to retain a grommet; used in forming a watertight pipe joint.
2. A locking nut on the shank of a pipe fitting, tap, or valve.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
Once you've given it a quick blast the brass back nut under the tap will move, then you can remove the taps.
"Eliminating conventional surface prep on the plated metal back nut connector without changing material or sacrificing bond strength of the silicone over mold was a challenge.
When fitting taps to a rim made from a thin material (such as pressed steel), use a "top-hat" spacer fitting placed under the back nut.
"My pals wouldn't believe me - but they went green with envy when I came back nut brown."
Fix overflow pipe to the overflow holes, screwing the outlet to the back nut. Fix the waste trap below the plughole to the waste pipe.
DONNY'S LITTLE HELPER Basin wrench who keep complaining For people back nuts on wash about loosening baths and sinks, the in hand basins, working makes basin wrench space a walk in the park.
You will still need to buy or hire a cranked tap spanner to loosen the old taps' back nuts fitted against the underside of the worktop.