Dorma 75140 3/4" Full Mortise Offset Brass Top Pivot for Lead-Lined Doors 1-3/4" Thick, Satin Chrome

That is what the 75140 is built for. The screw hole pattern is staggered so the fasteners straddle the lead sheet running down the center of the door instead of driving into it. It is a full mortise pivot, so it gets let into a mortise cut in the top of the door, and it ships with machine screws. It also works fine on ordinary doors that are simply extra heavy or extra thick.

Up to 800 lbs. That is heavy duty territory, well past what a normal hollow metal leaf weighs, and it is the reason this pivot gets specified on lead-lined X-ray and shielded room doors where the lead adds hundreds of pounds. The pivot runs needle bearings with hardened pins to take that load over a long service life.

Fire rated to 3 hours. That covers openings in walls needing up to a 3 hour rating, which is why it turns up on shaft and stairwell type assemblies as well as shielded rooms. It is a commercial grade part, not residential.

Only if you are converting the opening to pivot hung, which means mortising the top of the door and the frame head. If the door stays on its existing 4-1/2 inch butt hinges and you just want to stop the sag, the Hager 253 full surface reinforcing pivot is the part for that job, it fits 1-3/4 inch doors with 4-1/2 inch wide hinges. Note that the Hager 253 is not fire rated, so it does not belong on a rated opening; the Dorma 75140 is rated to 3 hours.

The Ives 7215 is a heavy duty brass offset pivot set with a header mount and a 500 lb capacity. The Dorma 75140 top pivot is rated for doors up to 800 lbs and carries a 3 hour fire rating. Both are heavy duty and both are fire rated. For a lead-lined or extra thick leaf at the upper end of that weight range, the 75140 is the one sized for it; for a 500 lb door where you need the complete pivot set in brass, the 7215 covers the opening.

No. The 75140 is non-handed, so the same part goes on a left hand or right hand opening. For a fleet of doors in a hospital imaging suite that means one part number covers every leaf regardless of swing, which cuts down what you stock.

No, the 75140 is a purely mechanical pivot with no electrical path through it. If the opening needs power at the leaf for an electric lock or exit device, that has to come from a separate power transfer device, an electric hinge, or a door loop.

The Hager 253 is a full surface reinforcing pivot for 4-1/2 inch wide hinges in a zinc plated finish, heavy duty, for 1-3/4 inch thick doors, and it is not fire rated. It reinforces a butt-hinged door rather than hanging an offset-hung one. The Dorma 75140 is a full mortise offset top pivot, also for 1-3/4 inch thick doors, in satin chrome, fire rated for 3 hours. If the door already swings on 4-1/2 inch butt hinges and is sagging, the 253 addresses that opening; if the door pivots on an offset point, the 75140 is the part.

They sit at different points on the door. The Hager 497 is a heavy duty forged bronze full mortise bottom pivot hinge with ball bearings, and it is not fire rated. The Dorma 75140 is the top pivot, full mortise, with needle bearings and hardened pins, and it is fire rated for 3 hours. Both are full mortise and heavy duty, so on a non-rated opening the 497 is the bottom half of the same style of hanging - it is a companion to a top pivot rather than a replacement for one.

626 satin chrome, which is the standard finish match for satin chrome lever trim, closers and push plates on a commercial opening. It is the only finish this pivot is offered in, so if the rest of the hardware on the door is 626 it lines up. The pivot itself is brass with a steel substrate construction.