Dorma 75133 3/4" Full Mortise Offset Steel Top Pivot, for Use on Fire Doors Rated Up To Three Hours, Satin Chrome

Up to 660 lbs. That covers most solid core and hollow metal commercial leaves, and it is the number to check against before you hang a heavy glass or a lead-lined door. If your leaf is over 660 lbs, this is the wrong pivot.

It is a full mortise pivot. The frame head and the top of the door both have to be prepped with a mortise pocket to take it. If you are working with existing openings that are not mortised, budget for the prep or look at a surface mounted reinforcing pivot such as the Hager 253, which mounts on the face for 4-1/2 inch wide hinges instead of cutting into the door.

The Ives 7215F is the nearest match in intent: a stainless steel 3/4 inch offset pivot set with a top header mount, fire rated, rated to 500 lb door capacity. The Dorma 75133 is a steel full mortise offset top pivot carrying a 3 hour fire rating and a door weight allowance up to 660 lbs. Both are 3/4 inch offset and both are heavy duty, so the deciding factors are door weight and whether you need a single top pivot or a full set. If the leaf is between 500 and 660 lbs, the 75133 is the one that covers it.

The Ives 7212 is a heavy duty brass offset pivot set rated to 200 lb capacity with a top header mount, and the Ives 7212V is the same set in a jamb mount version. Both are fire rated. The Dorma 75133 is built for doors up to 660 lbs, so on a light interior leaf you are buying capacity you will not use. Choose between the 7212 and 7212V by how the frame is prepped: header mount if you are anchoring into the head, jamb mount if you are anchoring into the jamb face.

The Hager 497 is a heavy duty full mortise bottom pivot hinge in forged bronze with a ball bearing, so it addresses the bottom of the opening while the Dorma 75133 addresses the top. One caution before you pair them: the Hager 497 is not fire rated, and the Dorma 75133 is rated for fire doors up to 3 hours. On a rated opening, every component in the hanging set has to hold the rating, so use a fire rated bottom pivot such as one from a matched Ives 7215F set instead.

Steel, and it is built as a heavy duty commercial pivot carrying leaves up to 660 lbs. That is the material and duty level you want on a main entrance or a stair door that cycles all day. If you are hanging on the exterior or somewhere wet, a bronze or stainless pivot such as the Ives 7215F stainless offset set or the Hager 497 forged bronze bottom pivot is the corrosion story instead.

The Ives 7212 offset pivot set is fire rated and sized for a 200 lb leaf, available with a top header mount or a jamb mount (7212V) depending on how your frame is prepped. The Ives 7215 steps up to 500 lb with a header mount. The Dorma 75133 top pivot is the one to reach for when the leaf runs heavier than those, up to 660 lbs. Do not substitute the Hager 253 or Hager 497 on a rated opening; neither is fire rated.

For aluminum doors and frames, look at the Kaba Ilco IP-22 series intermediate pivots or the IL-OP-10 series 1/8 inch recessed Arch and Vistawall pivot set, both standard duty. The Dorma 75133 is a full mortise offset top pivot for a standard commercial door and requires a mortise prep, which storefront stile and rail construction generally will not take. Note that the aluminum door pivots are not fire rated, while the 75133 carries a 3 hour rating, so they serve different openings.

They solve different problems despite both being called pivots. The Hager 253 is a full surface reinforcing pivot sized for 4-1/2 inch wide hinges in a zinc plated finish, for 1-3/4 inch doors, heavy duty and not fire rated. It reinforces a butt hinged door; the door still swings on its hinges. The Dorma 75133 is an offset hung top pivot in steel with a satin chrome 626 finish, mortised into the door and head, and it is what the door swings on. If the opening is butt hinged, the 253 is the reinforcement piece; if the door is offset hung, the 75133 is the pivot.

Satin chrome, BHMA 626. That is the standard match for the satin chrome and brushed stainless trim you will already have on commercial lever sets and closers, so it blends into a building standardized on 626. The 75133 is sold in that one finish, so there is nothing to specify on the order beyond the model.

No. The 75133 is a purely mechanical top pivot with no electrical transfer through it. If the opening needs power at the leaf for an electric lock, exit device or card reader, that has to come from a separate electric power transfer or a power transfer hinge elsewhere on the door.