Dexter C2000 Series - Grade 2 Single Dummy Ball Knob Trim

A single dummy trim is a knob on one face of the door with no latch and no working mechanism behind it. The C2000 single dummy ball knob mounts through the door face and gives you something to pull on, nothing more. The door has to be held shut by something else: a roller catch, a magnetic catch, ball catches, or a flush bolt on an inactive leaf. Every other C2000 function ships with a latch and strike; the dummy does not.

The C2000 cylindrical lock line is UL listed to 3 hours. But a dummy trim has no latch, and a fire door has to positively latch to hold in a fire, so the dummy alone will not satisfy the opening. Use it only on the inactive leaf of a pair where flush bolts or a fire exit device are doing the latching, and pair the active leaf with a latching C2000 function.

Yes, that's the usual use for it. The C2000 dummy mounts to the door face and the C2000 line is built around a 2-3/4 inch backset, so it sits over an existing standard 2-3/4 inch cross-bore prep. The latch bore in the edge of the door is left empty, since a dummy has no latch, so if the old latch face was visible you'll want a filler plate or a piece of edge trim over it.

Probably not. A dummy has no latch at all, so the door will swing open unless a catch holds it. What you likely want is a passage function, which latches but never locks. Comparable Grade 2 passage knobs include the Arrow RK01 ball knob and the Corbin Russwin CK4410 Global knob, both non-keyed and both rated for 1-3/8 inch to 1-3/4 inch doors, and the Falcon W101 with a 2-3/4 inch backset. Go with the dummy only where a catch is already holding the door or the leaf is inactive.

The Schlage A170 single dummy trim is the nearest peer: it is a Grade 2 non-keyed cylindrical knob lock in dummy function, the same grade and function as the Dexter C2000 single dummy ball knob trim. The Schlage A170 is rated heavy duty and covers a 1-3/8 inch to 1-7/8 inch door thickness range, where the Dexter C2000 covers 1-3/8 inch to 1-3/4 inch. Both are pull-only trim with no latch, so either mounts on the inactive leaf of a pair or a false door where the opening only needs something to grab.

The Dexter C2000 single dummy ball knob trim is dummy function, so it has no latch and will not hold a door closed. For a closet or hall door that needs a latch, the Corbin Russwin CK4410 is a Grade 2 non-keyed passage/closet cylindrical knob lock covering 1-3/8 inch to 1-3/4 inch doors, and the Falcon W101 is a Grade 2 medium duty passage/closet knob lock with a 2-3/4 inch backset and a fire rating. Both carry a working latch and retract with the knob from either side.

The Dexter C2000 ball knob trim is a Grade 2 product. Where the drawing calls for Grade 1 cylindrical knob hardware, the Sargent 8XG04 is a Grade 1 heavy duty storeroom/closet single cylinder knob lock with a 2-3/4 inch backset, matching the C2000 backset. The Falcon X101 is a Grade 1 heavy duty passage knobset with an interchangeable core and a 1-3/8 inch to 2-1/4 inch door thickness range, and the Schlage D10S is a Grade 1 heavy duty non-keyed passage knob lock with an Orbit knob. Note these are latching functions, not fixed dummy trim.

The Dexter C2000 single dummy ball knob trim covers 1-3/8 inch to 1-3/4 inch doors. For a 2 inch leaf, the Corbin Russwin CK4310 Grade 1 non-keyed passage/closet knob and the CK4851 Grade 2 entrance/office knob both cover 1-3/8 inch to 2 inch doors, and the Deltana 6171 round knob entry and 3381 egg knob entry cover the same 1-3/8 inch to 2 inch range. The Falcon X101 Grade 1 passage knobset reaches 1-3/8 inch to 2-1/4 inch. All of these are latching, so on a thick inactive leaf you would be adding a latch the dummy trim does not have.

Two things get mistaken for dummy trim. The Sargent 78-2875 outside knob only with B design and the Sargent 28C-KNOB exit device trim with knob and rose are knob trims, but they are exit device trim built to mount to a rim or vertical rod device, not to a bare door face. The Imperial USA ED-BKL580 knob trim is likewise storeroom function exit device trim. The Dexter C2000 ball knob trim is non-handed dummy trim for a plain bored door, so none of the exit device trims cross over.

No. It's non-handed, so the same part works on a left hand or right hand door and you don't need to know the swing before you order. Handy if you're buying for a building where the openings aren't consistent.

It's specified as commercial and carries a Grade 2 rating, the medium duty tier used for offices, multi-family corridors, and light institutional openings. For heavier traffic, ZenSupply carries Grade 1 knob locks like the BEST 8K Series and the Schlage D Series. Note that grade applies to the operating functions in the family; a dummy trim has no mechanism to cycle.

One single dummy covers one face of one leaf. A pair of doors with a pull on each leaf needs two. If you'd rather buy a matched two-knob set in one order, the Emtek Arts and Crafts Hammered Egg and the Emtek Classic Brass Crystal Georgetown and Providence dummies are all sold as pairs, though those are decorative brass knobs rather than a commercial cylindrical trim.

F76 is the ANSI/BHMA function designation for this trim, which is the number an architect or facilities spec writes when they want a dummy knob rather than a working set. Quoting F76 on a submittal is what tells the reviewer this is trim only and not a latching function.

Non-keyed, and there's no cylinder to add. It's trim only, with no locking mechanism inside. If the door needs to lock, you want a keyed function instead, such as the Sargent 6G04 Grade 2 storeroom knob or the Corbin Russwin CK4851 entrance/office knob lock with a conventional cylinder.

Every C2000 function other than the dummy ships with a 1-1/8 x 2-1/4 inch square-corner beveled latch on a 2-3/4 inch backset and an ANSI 1-1/4 x 4-7/8 inch curved lip strike, part 30-148. The brass 605 ball knob version instead comes with a square-corner beveled latch on a 2-3/8 inch backset and the ANSI 1-1/4 x 2-1/4 inch T-strike. Worth knowing before you cut frames, because the two backsets need different prep.

Two Grade 2 commercial dummy knobs sit alongside the Dexter C2000 ball knob trim. The BEST 6K series single dummy trim is a Grade 2 non-keyed cylindrical knob lock rated medium duty. The Schlage A170 single dummy trim is Grade 2 and rated heavy duty. All three are dummy function, meaning fixed trim with no latch or turn, so the choice comes down to knob design and the duty level the traffic calls for.

The Cal-Royal BA40 from the Barrington BA series is a dummy knob cylindrical lock covering 1-3/8 inch to 1-3/4 inch doors, the same door thickness range as the Dexter C2000 ball knob trim, and the same fixed dummy function. Where they part company is grade: the Dexter C2000 is Grade 2 commercial and ANSI/BHMA F76. If the submittal calls out a grade for the dummy trim, the Bravura Biloxi round trim dummy knobset is the other Grade 2 dummy option in the same knob family.

The Dexter C2000 ball knob trim is a Grade 2 commercial product. For lighter interior duty the Pamex FTF Baron knob lockset comes in Grade 3 in passage, privacy and entrance/office functions, all covering 1-3/8 inch to 1-3/4 inch doors, the same door range as the Dexter. Cal-Royal offers the BER20 Grade 3 privacy knob and the BER00 Grade 3 entrance/office knob over the same door range. These are latching functions rather than fixed dummy trim, so they suit doors that need to stay shut.

The Dexter C2000 ball knob trim is a ball-shaped knob in 613 oil-rubbed bronze or 630 satin stainless steel. The Arrow RK01 is a Grade 2 non-keyed passage cylindrical lock with a ball knob covering 1-3/8 inch to 1-3/4 inch doors, the closest ball-knob shape match in a working passage function. The Arrow MK01 is the same Grade 2 passage function over the same door range in the MK series. Both let you run a latching knob on the doors that swing and the Dexter dummy on the leaves that do not.

They do different jobs. The Dexter C2000 ball knob trim is dummy function and non-keyed, fixed trim with nothing to operate. A privacy knob such as the Pamex FTF Baron in Grade 3, the Cal-Royal BER20 in Grade 3, or the Baldwin Estate 6112 St. Thomas knob carries a latch and an inside locking turn for a bath or bedroom. If the opening is an inactive leaf or a false front with no latch prep, a privacy knob will not mount to it correctly and the dummy trim is the right part.

Two finishes: 613 oil-rubbed bronze and 630 satin stainless steel. 630 is the common commercial choice and is what most office and institutional door hardware is specified in, so it will read as a match alongside existing 630 levers and knobs. 613 is the darker bronze used where the interiors are wood-toned.