Bommer LB8000 Series Steel Lubricated Bearing Three Knuckle Architectural Grade Hinge with Button Tips

The LB8000 is a medium duty, commercial grade hinge built for medium weight doors at average frequency. That covers most interior office, classroom, and apartment corridor doors. For a heavy door or a high traffic entrance, step up to a heavy duty hinge such as the Hager BB1168 full mortise ball bearing or the Ives 3CB1HW heavy weight concealed bearing.

Two sizes: 4-1/2 x 4-1/2 inches and 4-1/2 x 4 inches. The 4-1/2 inch leaf height matches the standard commercial mortise cut in a hollow metal frame, so measure the existing hinge leaf height first. The 4-1/2 x 4 is the narrower-width option where the door has a shallower leaf width. If your doors are cut for 4 x 4 or 3-1/2 x 3-1/2, the LB8000 will not drop in.

Yes, it is a template hinge, meaning the screw hole pattern follows the standard template layout used on hollow metal doors and frames. That is what lets you swap hinges across a building without re-drilling.

The pin is a non-rising removable pin with a flush tip pin and plug, so the hinge can be taken apart in place for door removal. On an out-swing exterior opening where the hinge barrel is exposed, specify a non-removable pin hinge instead, for example the Deltana CSB45N 4-1/2 x 4-1/2 NRP hinge or the Hager BB1168 NRP.

Full mortise. Both leaves recess into the door edge and the frame rabbet, so the opening has to be routed or factory prepped for it. If the door or frame cannot be mortised, you need a half mortise or full surface hinge, such as the Hager 1129 half mortise commercial hinge.

No - the LB8000 is a mechanical lubricated bearing hinge with no conductor. For power transfer you need an electrified hinge: the BEST CECB179 12C is a steel full mortise concealed bearing electrified hinge with a 12-wire quick connect rated medium duty, and the Command Access ETH-CB70 is a 3 knuckle standard weight steel base energy transfer hinge, also medium duty, which matches the LB8000 three knuckle configuration. The Stanley CECB1900R54L is a three knuckle concealed bearing concealed conductor hinge in 4-1/2 inch by 4-1/2 inch square corner, left-handed, 4-wire.

The Orca Hardware 3535 Series is a 4-1/2 inch by 4-1/2 inch square corner ball bearing commercial hinge rated medium duty, the same leaf size and duty level as the LB8000 in its 4-1/2 inch by 4-1/2 inch size. The bearing style differs: ball bearing versus the LB8000 lubricated bearing three knuckle build. Delaney also lists a 4 inch by 4 inch commercial ball bearing hinge with square corners (CH401X) if the frame prep takes a 4 inch leaf.

The Ives 3CB1 is the nearest match: a steel 3-knuckle concealed bearing full mortise hinge rated medium duty, the same knuckle count, mounting style and duty level as the LB8000, which carries lubricated bearings in a three knuckle architectural grade barrel. The Ives 3CB1-B is the same 3-knuckle concealed bearing full mortise medium duty hinge under a separate part number. Both differ from the LB8000 in bearing type - concealed bearing rather than the LB8000 exposed lubricated bearing between knuckles - so the barrel appearance is not identical.

Step up to a heavy duty hinge. The Ives 3CB1HW is a steel heavy weight concealed bearing full mortise hinge with 3 knuckles, keeping the same knuckle count and mounting as the LB8000 while carrying a heavy duty rating. The Hager BB1168 NRP is a full mortise ball bearing heavy duty hinge with a non-removable pin, where the LB8000 uses a non-rising removable pin. The Stanley FBB191 in 4-1/2 inch by 4-1/2 inch is a 5-knuckle full mortise standard weight hinge rated heavy duty and matches the LB8000 largest size.

A few in the same hinge family are not drop-in alternatives. The Hager 1129 is a half mortise hinge, mortised into the door but surface applied to the frame, where the LB8000 is full mortise. The Hager 990 STEEL is a full surface prison hinge 3 inch by 4 inch with a welded tip. The BEST DAP-3 is a double acting pivot for commercial interior doors rather than a mortise hinge at all, and the Stanley 2060R in 4-1/2 inch by 4-1/2 inch is a spring hinge that self-closes, which the LB8000 does not do. Residential-oriented pairs such as the Emtek 91013 plain bearing hinges in 3-1/2 inch by 3-1/2 inch also will not fill a 4-1/2 inch commercial frame prep.

The LB8000 uses a non-rising removable pin, so on an outswing opening where the barrel is exposed, consider a non-removable pin or security hinge instead. The Hager BB1168 NRP is a full mortise ball bearing heavy duty hinge with a non-removable pin. Deltana CSB45N is a 4-1/2 inch by 4-1/2 inch square hinge pair with a non-removable pin, matching the LB8000 largest leaf size. Deltana DE44R5TA is a 4 inch by 4 inch steel security hinge pair with 5/8 inch radius corners.

No handing to specify. It is a full mortise three knuckle hinge with a non-rising removable pin, so the same hinge works on a left or right hand door. You pick size and finish only.

Three finishes: Primed for Painting, Bright Black Japanned, and Satin Chrome. The primed version is the one to order when the hinges get painted out to match the door or frame. Satin Chrome is the match for brushed chrome lever and closer hardware; Bright Black Japanned suits dark or black painted openings. All three are offered in both the 4-1/2 x 4-1/2 and 4-1/2 x 4 sizes.

The LB8000 carries lubricated bearings between its three knuckles, so the door swings with less friction and the knuckles wear more slowly than a plain bearing hinge, which is just metal on metal. Plain bearing hinges, like the Orca 4040 or the Ives 1010RP, are fine on light interior or residential doors that get opened occasionally. Put bearings under anything with a closer on it or steady daily traffic.

It is specified as a commercial hinge, and the 4-1/2 inch leaf is larger than the typical residential door prep. Most houses are cut for 3-1/2 x 3-1/2 inch hinges, which is where the Emtek 91013 residential plain bearing pair or the Deltana DSB35 residential square hinge fit instead. Use the LB8000 when the opening is already prepped commercial.

Three knuckle hinges put fewer, longer bearing surfaces in the barrel and give a cleaner barrel appearance with button tips. Five knuckle hinges, like the McKinney MP79 MacPro or the Stanley FBB191 in 4-1/2 x 4-1/2, spread the load across more joints and are the usual pick when a heavier door or a longer bearing stack is wanted. For medium weight doors at average frequency, the three knuckle LB8000 is the right class.

Yes. Orca Hardware offers plain bearing commercial hinges rated medium duty in 4 inch by 4 inch square corner (4040 Series) and 4 inch by 4 inch with 1/4 inch radius corners (4014 Series), as well as 3-1/2 inch by 3-1/2 inch with 1/4 inch radius (3514 Series). Plain bearing hinges have no bearing elements between the knuckles, where the LB8000 runs lubricated bearings and is rated for average frequency openings. Note the Orca sizes are 4 inch and 3-1/2 inch leaves, not the 4-1/2 inch by 4-1/2 inch and 4-1/2 inch by 4 inch sizes the LB8000 is built in.

The LB8000 is specified for commercial use at a medium duty level with three knuckles and lubricated bearings. For interior residential doors, Delaney bulk steel residential hinges come as pairs in 3-1/2 inch by 3-1/2 inch with 5/8 inch radius corners, and exterior residential pairs in 4 inch by 4 inch with 5/8 inch radius. Deltana DSB35 is a 3-1/2 inch by 3-1/2 inch square residential hinge pair and DSB3 a 3 inch by 3 inch square pair. Ives 1010RP comes as a set of three steel plain bearing residential hinges with square corners.

The McKinney MP79 MacPro is a 5-knuckle full mortise hinge rated standard duty, and the MPB79 is also a 5-knuckle standard weight MacPro hinge. The LB8000 is a three knuckle full mortise hinge with lubricated bearings rated medium duty for medium weight doors at average frequency. The practical difference is barrel appearance and knuckle count - five knuckle barrels will not visually match three knuckle hinges already hung on adjacent doors, so keep the count consistent across an opening set.

The LB8000 is a steel hinge offered primed for painting, bright black japanned and satin chrome. Where a non-ferrous base metal is required, the McKinney T2314 is a non ferrous hinge, standard weight, 5 knuckle, rated medium duty, the same duty level as the LB8000 but with a five knuckle barrel rather than three.

Detention openings use a different class of hinge than a medium duty architectural hinge like the LB8000. The BEST BB855 is a heavy-duty steel double weight concealed ball bearing prison hinge, and the Stanley BB855 is a double weight prison hinge in 5 inch by 6 inch furnished with no holes and not swaged, so it is drilled and swaged to suit the frame on site. The BEST CB1969R is a concealed bearing heavy weight pivot-reinforced hinge rated heavy duty for high abuse openings.

The LB8000 is a mechanical lubricated bearing hinge with no monitoring built in, so a door position switch would be a separate device. If you want it in the hinge, the Command Access ETM-CB70 is an energy transfer monitor hinge with door position sensing on a 3 knuckle steel base rated medium duty, matching the LB8000 three knuckle configuration and duty level. The ETM-BB68 is the heavy duty 5 series version with an integrated door position switch.

Standard practice is three hinges on a full height commercial door up to about 7 feet 6 inches, and a fourth added above that. The LB8000 is sold by the individual hinge, not as a pair, so order per leaf accordingly.

Yes. The Hager 920 is a full mortise concealed plain bearing hinge with 2 knuckle steel construction rated medium duty, the same duty level as the LB8000 but with a two knuckle barrel rather than three. McKinney SQ3331 is a square barrel 2-knuckle decorative hinge in 4-1/2 inch by 4-1/2 inch, matching the LB8000 largest leaf size with a squared barrel profile instead of the LB8000 round barrel with button tips.