American Standard Monnerey Faucet Bonnet Nut - AMS-904939

No, don't assume it crosses over. 904939 is the Monnerey repair part. American Standard bonnet nuts vary in thread diameter and pitch between series, and a nut that threads a turn or two before binding will damage the faucet body. Identify your faucet series first, then pull the matching repair part number.

The bonnet nut is the threaded collar that clamps the stem or cartridge assembly down into the faucet body. A drip usually comes from the seat or the stem washer, not the nut. You replace the bonnet nut when the threads are stripped, it's cracked, or the chrome is chewed up from a wrench so it won't seal or seat properly. American Standard catalogues 904939 as a fastener-class repair part for Monnerey faucets.

It's supplied in polished chrome, the only finish offered on 904939. On a Monnerey faucet with chrome handles and spout it'll match; on a brushed nickel or bronze trim set it will not, and there's no alternate finish of this nut to order.

It ships as a single nut. A two-handle Monnerey lavatory or kitchen faucet has a bonnet on each side, so if you're rebuilding both hot and cold you need two of 904939-0020A. Property managers doing a floor of units should count one per handle, not one per faucet.

The bonnet nut is a fastener only, no washers, O-rings, seats or springs come with it. A working stem rebuild usually needs the stem or cartridge, seat washer and packing as well. If you're opening the faucet anyway, pull those Monnerey stem parts at the same time so you're not back in the unit twice.

It's catalogued as a repair part rather than being split residential or commercial, so it goes into any Monnerey faucet regardless of the building. The practical limit is the faucet, not the setting: if the fixture is a Monnerey, the nut applies whether it's in an apartment, a hotel bath or an office washroom.