Design Hardware UL Manual Flush Bolt (Metal Doors)

Rod length is a straight function of door height. Standard is the 10 inch rod, which covers a 7 foot door. For an 8 foot door order the 22 inch extension rod, for a 9 foot door the 34 inch, and for a 10 foot door the 46 inch. All four lengths are orderable, so measure the leaf height before you place the order rather than trimming in the field.

On the bottom bolt, yes, use one. The bolt drops into the floor and the pocket fills with grit, and once it's packed the bolt won't seat. Design Hardware calls for the DPS-1 dust proof strike to keep the bottom strike from being blocked by dirt. The strike supplied with the bolt itself measures 15/16 inch x 2-1/4 inch and is the frame strike for the top bolt.

Plan the prep around a 3/4 inch rod backset off the door edge and a 1 inch x 6-3/4 inch face plate cut. The bolt projects 3/4 inch, with a 1-1/2 inch adjustable bolt head so you can take up the gap at the head or the floor without redoing the prep. A 1 inch x 2 inch guide carries the rod up the door.

Usually, with one thing to check. The bolt throws 3/4 inch and the head adjusts over a 1-1/2 inch range, so it can reach an existing head strike or floor strike that sits a little high or low without re-cutting anything. The strike supplied measures 15/16 inch x 2-1/4 inch, so if your existing strike cutout is smaller than that in either direction you'll be patching the frame. Measure the old strike plate before you pull it.

No. The UL-MFB-M needs a 1 inch x 6-3/4 inch face plate mortise and a 3/4 inch rod backset in the door edge, which a narrow aluminum stile will not give you. For glass front and aluminum storefront pairs, go to a flushbolt built for that application, like the Adams Rite MS2180 Series auto-release two-point flushbolt. Ordering the metal door bolt for a storefront leaf means a part that physically cannot be prepped in.

The ABH 1855S is a manual flush bolt single for metal doors with a 3/4 inch throw, which matches the 3/4 inch bolt throw of the Design Hardware UL manual flush bolt. The Ives FB457 is also a manual flush bolt for metal doors, supplied with a 12 inch rod length. The Design Hardware bolt covers 7, 8, 9 and 10 foot metal doors through its 10 inch, 22 inch, 34 inch and 46 inch rod options, so if you are matching taller leaves, check the rod length the peer ships with before swapping.

A manual flush bolt is thrown and retracted by hand at the bolt, so the inactive leaf stays fixed until someone operates it. Where the inactive leaf must release on its own, the ABH 1860P/1862P is an automatic flush bolt pair, fire rated 3-hour with a thermal lock, and the Adams Rite MS2180 is an auto-release two-point flushbolt with a Smartlock mechanism. The Ives FB41 is an automatic flush bolt set with a 3/4 inch throw carrying a 90 minute fire rating, but it is built for wood doors rather than metal.

The Design Hardware UL manual flush bolt is prepped for metal doors, with a 1 inch by 6 3/4 inch face plate and a 3/4 inch rod backset. For wood leaves, the Adams Rite 1877 is a cylinder-operated flushbolt for paired wood doors, the Ives FB41 is an automatic flush bolt set for wood doors with a 3/4 inch throw, and the Ives FB42 is a top automatic flush bolt for wood doors with an auxiliary fire latch. Wood-door bolts are mortised into a different edge prep, so the metal-door body will not drop into a wood-door pocket.

Manual means somebody throws it by hand. The Design Hardware UL manual flush bolt has a lever you push up or down at the door edge to project the 3/4 inch bolt, so the inactive leaf stays bolted until a person walks over and releases it. An automatic flush bolt retracts on its own when the active leaf opens, which is what you want when both leaves need to swing without a second trip. ZenSupply carries automatic sets like the Ives FB41 for wood doors and the ABH 1860P/1862P automatic pair. Manual is the right call when the inactive leaf is normally kept fixed, for example a stockroom or a mechanical room pair.

Three finishes, all standard BHMA numbers so they line up with the levers and closers already on the opening: 606 satin brass, 613 dark bronze, and 626 satin chrome. 626 is the usual commercial default and the one to pick if you're standardizing a building on satin chrome. Each finish is available in every rod length, 10, 22, 34, and 46 inch.

No handing on a flush bolt, it mortises into the door edge and the lever works either direction, so the same part serves the top and the bottom of the inactive leaf. What does change is rod length: the bottom bolt on a 7 foot door uses the standard 10 inch rod, while the top of a taller leaf takes the 22, 34, or 46 inch extension depending on whether it's an 8, 9, or 10 foot door. Count two per pair of doors if you're bolting top and bottom.

Closest like-for-like is the Ives FB358 manual flush bolt, also 3/4 inch throw with a 1/2 inch bolt diameter, or the ABH 1855S manual flush bolt single for metal doors, likewise 3/4 inch throw. If you're matching a specific rod length rather than a series, the Ives FB457 is a metal door manual flush bolt supplied with a 12 inch rod. All of them mortise into the door edge the same way, so the decision comes down to the prep already cut in your leaf.

Depends on whether the pair is fire rated and whether that leaf has to release. A manual flush bolt bolts the inactive leaf top and bottom and stays bolted until somebody throws it back by hand, which is fine for a stockroom, electrical room, or a service pair where the second leaf is only opened to move equipment. On a rated opening where the inactive leaf must relatch on its own, a fire bolt or automatic set is the direction to go, such as the ABH 1854 manual flush bolt set with fire bolt for metal doors or the ABH 1858 universal bottom fire bolt.

Yes, but that is a different device. The Adams Rite 1870 is a cylinder-operated flushbolt with key control, the Adams Rite 1877 is a cylinder-operated flushbolt for paired wood doors, and the Adams Rite MS1880/MS1881 is a two-point flushbolt with an interlock mechanism. Those are operated from a cylinder rather than by hand at the bolt face, which changes who can secure and release the inactive leaf. The Design Hardware UL manual flush bolt is thrown at the 1 1/2 inch adjustable bolt head with no cylinder involved.

A fire bolt adds a top latch that holds the inactive leaf under fire conditions rather than relying only on the hand-thrown bolt. The ABH 1854 is a manual flush bolt set with fire bolt for metal doors, and the ABH 1858 is a universal bottom fire bolt of manual operation. The Ives FB358 is a manual flush bolt with a 3/4 inch throw and 1/2 inch bolt diameter carrying a fire rating. If the opening is a labeled fire pair, specify from the fire bolt group; the Design Hardware manual flush bolt is ordered by rod length for 7, 8, 9 and 10 foot metal doors.

Where the leaf is standard height and you do not need a rod run to the head, a short lever-style flush bolt does the job: the Trimco 3999 is a 6 inch corner mount flushbolt with a rounded end, the Trimco 3999SE is the same 6 inch corner mount in a square end, the Orca Hardware 86SQ is a 6 inch flush bolt with radius corners, and the Delaney 4108 is a 6 inch square end solid brass flush bolt. Those are 6 inch bodies mortised into the door edge; the Design Hardware UL manual flush bolt uses a 1 inch by 6 3/4 inch face plate with a rod carried up to the head, supplied for 7 foot doors as standard.

Not interchangeably. The International Door Closers FB-1202 is a flush bolt with a positive U joint actuator, 5/8 inch throw, 1/8 inch offset with 7/8 inch backset, square end, with guide. The Design Hardware UL manual flush bolt has a 3/4 inch bolt throw on a 3/4 inch rod backset with a 15/16 inch by 2 1/4 inch strike and a 1 inch by 2 inch guide. The shorter throw and the different backset mean the strike depth and the edge prep are not the same, so confirm the frame and floor strike before treating one as a drop-in for the other.

For a door that gets worked daily, yes. The UL-MFB-M uses a cast brass body rather than formed sheet, which matters at the lever and the rod connection, the two points that wear first when a maintenance crew is throwing the inactive leaf several times a day. On a pair that is bolted once and left alone, a lighter 6 inch flush bolt like the Orca 86SQ or the Trimco 3999SE corner mount will do the job.

Slide and mortise style bolts read as the same part in a catalog but solve a different opening. The Delaney 4101 is a 7 inch slide type mortise-in flush bolt and the Delaney 4363 is a 7 inch mortise extension flush bolt, and the Emtek flush bolts are a residential-pattern flush bolt line. None of those are the metal-door rod assembly the Design Hardware UL manual flush bolt provides, which carries a supplied rod for 7 foot doors and 22 inch, 34 inch and 46 inch extension rods for 8, 9 and 10 foot doors. Match the door construction and leaf height first, then the finish.

The Design Hardware UL manual flush bolt is offered in 626 satin chrome, 613 dark bronze and 606 satin brass, in each of the 10 inch, 22 inch, 34 inch and 46 inch rod lengths, so one finish carries across 7 through 10 foot metal leaves. Among the peers, the Delaney 4108 is a solid brass flush bolt body and the Trimco 3999 and 3999SE are 6 inch corner mount bodies in rounded and square end. Standardizing on a single flush bolt family keeps the face plate outline consistent across the doors, which matters more than finish alone when leaves get repaired later.