Deltana 4FBS 4" Flush Bolt, Heavy-Duty, Solid Brass

Not cleanly. At 4 inches the faceplate is shorter than a 6 inch plate, so the old mortise will show above or below it. Stay at 6 inches and match the corner style instead: the Trimco 3999SE is a 6 inch corner mount with a square end, the Trimco 3999 is the same in a rounded end, the Delaney 6 inch square end solid brass flush bolt is another square option, and the Orca Hardware 6 inch flush bolt has radius corners.

The Deltana 4FBS is a manually operated flush bolt with a 3/4 inch throw, so a person has to throw and retract the bolt at the inactive leaf. Where the inactive leaf has to self-latch, the Ives FB41 is an automatic flush bolt set for wood doors with a 3/4 inch throw and a 90 minute fire rating, and the ABH 1860P/1862P is an automatic flush bolt pair rated 3 hour with a thermal lock. On wood doors the Ives FB42 is the top automatic flush bolt with an auxiliary fire latch. Automatic bolts drive off the active leaf closing, so they mortise differently than the 4FBS.

The Deltana 4FBS is a 4 inch solid brass flush bolt with a square corner face and a 3/4 inch throw. If the opening needs more face plate coverage, the Delaney 4108 is a 6 inch square end solid brass flush bolt, and the Orca Hardware 86SQ is a 6 inch flush bolt with radius corners. The Delaney 4108 keeps both the solid brass construction and the square end profile of the 4FBS at the longer length; the Orca 86SQ rounds the corners, which changes the mortise cut at the ends of the pocket.

The Deltana 4FBS is a 4 inch solid brass flush bolt with a recessed install into the edge of the inactive leaf. For flush bolts built specifically for metal doors, the ABH 1855S is a manual single flush bolt for metal doors with a 3/4 inch throw - the same throw as the 4FBS - and the ABH 1854 is a manual flush bolt set with a fire bolt for metal doors. The Ives FB457 is a manual flush bolt for metal doors with a 12 inch rod length, which is what you specify when the bolt has to reach a header above the face plate.

The Deltana 4FBS is thrown by hand at the door edge, with no key control over who operates it. Where the inactive leaf has to be under key, the Adams Rite 1870 is a cylinder-operated flushbolt with key control, and the Adams Rite 1877 is a cylinder-operated flushbolt for paired wood doors. Cylinder-operated flushbolts are prepped for a cylinder in the face rather than a lever or slide, so the door prep is not interchangeable with the 4FBS mortise.

They mount differently. The Deltana 4FBS is a 4 inch flush bolt recessed into the edge of the inactive leaf. The Trimco 3999 is a 6 inch corner mount flushbolt with a rounded end, and the Trimco 3999SE is the 6 inch corner mount version with a square end. A corner mount unit sits at the corner of the door rather than in the edge mortise the 4FBS uses, so it is not a drop-in for an existing 4FBS pocket - if you are matching a square end appearance in a corner mount, the 3999SE is the square end of the pair.

The bolt itself is one piece of the opening. You'll also need a strike at each end, one in the frame head and one in the threshold or floor, sized to take the 3/4 inch throw. On a pair without a mullion, most jobs add a coordinator so the inactive leaf closes first and a lock or latch on the active leaf to catch against it. The 4FBS ships as a single unit, so count two per inactive door.

Manual is what the 4FBS is. Someone has to reach up and throw it, which is fine for a leaf that stays shut most of the year, a storeroom pair, or a set of French doors. Automatic bolts throw themselves when the inactive leaf closes, so nobody has to think about it, and that's what you want on doors staff use daily or on a labeled opening. The Ives FB41 automatic flush bolt set for wood doors and the ABH 1860P/1862P automatic pair are the automatic route.

Nine: Polished Brass, PVD Polished Brass, Antique Brass, Polished Chrome, Brushed Chrome, Brushed Nickel, Antique Nickel, Oil Rubbed Bronze, and Paint Black. If you're matching a building's existing brass hardware and want the finish to stay put in a high-touch or exterior spot, PVD Polished Brass is the plated option; standard Polished Brass will patina.

It's built as a commercial part: solid brass throughout, heavy-duty construction. Brass won't rust the way a plated steel bolt will, which is why these get specified on exterior pairs and in humid interiors. For a high-abuse metal door opening, a metal-door specific bolt like the ABH 1855S manual flush bolt with 3/4 inch throw is the closer match.

Not with the 4FBS. It's a manual bolt, thrown and released by hand by anyone who can reach it, with no key control. For a leaf that has to stay secured against release, a cylinder-operated flushbolt is the answer: the Adams Rite 1877 is made for paired wood doors, and the Adams Rite 1870 Series adds key control. The Adams Rite MS1880/MS1881 two-point flushbolts with an interlock mechanism go further where you need top and bottom tied together.

The Deltana 4FBS is a single 4 inch flush bolt with a 3/4 inch throw, so one unit secures one end of the inactive leaf and you order a second unit for the other end. A two-point flushbolt handles both ends from one mechanism: the Adams Rite MS1880/MS1881 is a two-point flushbolt with an interlock mechanism, and the Adams Rite MS2180 is an auto-release two-point flushbolt with a Smartlock mechanism. Those are the ones to look at when the specification calls for top and bottom to move together rather than as two independent bolts.

The Deltana 4FBS throws 3/4 inch. Where the head or sill prep will not accept that much bolt, the International Door Closers FB-1202 is a flush bolt with a 5/8 inch throw, a positive U joint actuator, a 1/8 inch offset with 7/8 inch backset, a square end, and a guide. The shorter throw and the stated backset are the numbers to check against the strike pocket you already have before ordering either one.

The Deltana 4FBS is solid brass and comes in Oil Rubbed Bronze, Brushed Nickel, Antique Nickel, Paint Black, Polished Chrome, Brushed Chrome, Polished Brass, Antique Brass, and PVD Polished Brass, which covers most of what a decorative package calls for at 4 inches. In the same solid brass decorative family, the Delaney 4108 is a 6 inch square end solid brass flush bolt, and Emtek also offers flush bolts. If the doors on the job vary, keeping the same brand across the openings is the simplest way to hold the finish match.

The Deltana 4FBS is a 4 inch manual flush bolt used at either end of the inactive leaf, ordered per unit. When the requirement is specifically a bottom fire bolt, the ABH 1858 is a universal bottom fire bolt with manual operation, and the ABH 1854 is a manual flush bolt set that includes a fire bolt for metal doors. The Ives FB358 is a manual flush bolt with a 3/4 inch throw and a 1/2 inch bolt diameter carrying a fire rating.

The Deltana 4FBS is a 4 inch flush bolt with a 3/4 inch throw recessed into the door edge, which suits an opening where the bolt only has to travel a short distance to its strike. 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 - an extension unit is what you add when the bolt has to reach further than the standard body allows, typically at a tall top rail. Check the distance from the face plate location to the strike before choosing between them.