Delaney 6" Round End Solid Brass Flush Bolt

The Delaney round end bolt is a 6 inch flush bolt, which is the standard short length for the head and sill of a normal height inactive leaf. Six inches covers the faceplate and bolt together, so the rod does not run up the stile the way a 12 inch flush bolt does. On a tall door or a transom height leaf where you need the bolt to throw well above head height, a longer rod bolt is the right call, like the Ives FB457 with a 12 inch rod length.

Mortised flush bolts get pocketed into the edge of the inactive leaf, and the bolts built for hollow metal are sold as such because the prep and the bolt body differ from a wood door version. For metal leaves, ABH lists the 1854 set and the 1855S single for metal doors, and the Ives FB457 is a manual flush bolt for metal doors. Confirm the leaf material before you cut, because a bolt sized for a wood door edge will not drop into a hollow metal channel cleanly.

Go to a bolt the set carries a fire rating for. The Ives FB358 manual flush bolt is fire rated and has a 3/4 inch throw with a 1/2 inch bolt diameter. The Ives FB41 automatic flush bolt set for wood doors is rated 90 minutes. The ABH 1860P/1862P automatic flush bolt pair is fire rated 3 hour with a thermal lock, and the ABH 1854 series manual flush bolt set for metal doors includes a fire bolt. For an institutional opening where the drawing calls out a rating, specify from that group rather than a solid brass surface style bolt.

The Trimco 3999 is the nearest match in form: a 6 inch corner mount flushbolt with a rounded end, the same length and the same round end profile as the Delaney. The Orca Hardware 86SQ series is also a 6 inch flush bolt, though it is described with radius corners rather than a round end. If the appearance of the exposed face matters because the bolt sits on an inactive leaf a tenant sees every day, the Trimco 3999 rounded end is the one that reads the same as the Delaney.

The automatic and cylinder operated bolts. The Ives FB41 automatic flush bolt set for wood doors and the Ives FB42 top automatic flush bolt with auxiliary fire latch retract on their own when the active leaf closes, so they work as a system with the strike and latch rather than as a hand thrown bolt. The Adams Rite 1870 series and 1877 flushbolts are cylinder operated with key control, meaning they need a cylinder and a key to throw. The Adams Rite MS1880/MS1881 are two point flushbolts with an interlock mechanism and the MS2180 series is auto release with a Smartlock mechanism. None of those drop in where a hand operated bolt was; they change how the inactive leaf is secured and what else the opening needs.

The metal door bolts are called out as such. The ABH 1855S is a manual flush bolt single for metal doors with a 3/4 inch throw, the ABH 1854 series is a manual flush bolt set with fire bolt for metal doors, and the Ives FB457 is a manual flush bolt with a 12 inch rod length for metal doors. The ABH 1858 is a universal bottom fire bolt, manual operation. The Delaney is a solid brass bolt in a 6 inch length, which suits wood and decorative openings where the finish is part of the look.

It's the shape of the exposed faceplate and the mortise you cut for it. The Delaney bolt has a round end, so the pocket is routed with a rounded corner, which is what a router and a standard bit produce naturally on a wood door. A square end needs the corners chiseled square. If you're matching bolts already in a building, match the end shape or the old mortise will show. Trimco makes both in 6 inch corner mount, the 3999 rounded end and the 3999SE square end, and the IDC FB-1202 is a square end.

The Delaney 6 inch bolt gives you the bolt and faceplate. Budget separately for the strike at each end, a frame strike for the top bolt and a floor strike or dust proof strike for the bottom, plus the router bit or chisel work to cut the 6 inch mortise in the door edge. On an exterior pair, a dust proof strike in the threshold keeps grit out of the bottom bolt hole, which is the usual reason an old bottom bolt stops throwing.

The Adams Rite 1870 series is a cylinder operated flushbolt with key control, and the Adams Rite 1877 is a cylinder operated flushbolt for paired wood doors. Both put the throwing of the bolt behind a cylinder, which is how you keep tenants or staff from releasing the inactive leaf. The Delaney 6 inch brass bolt is thrown by hand, so anyone at the door can operate it. For a wood pair where the bolt has to stay under key control, the 1877 is the one specified for paired wood doors.

They differ at the visible end of the faceplate, and that is usually what decides it. The Trimco 3999SE is a 6 inch corner mount flushbolt with a square end, while the Trimco 3999 in the same length is rounded. The Delaney 6 inch bolt is a round end. If you are adding a bolt to a pair of doors that already carries square end hardware, matching the end profile keeps the set looking uniform; if you are replacing a round end bolt, the cutout in the edge of the door was prepped to the round profile.

The Ives FB457 is a manual flush bolt with a 12 inch rod length for metal doors, which is the choice when the bolt has to be operated from a height reachable by hand while the bolt itself engages further up the frame. The Delaney bolt is a 6 inch unit, so the operating point and the bolt sit close together on the edge of the door. Measure from where you want the lever to fall to where the strike will be before picking between the two.

Throw is the figure to check against your strike depth. The Ives FB358 manual flush bolt has a 3/4 inch throw with a 1/2 inch bolt diameter, and the ABH 1855S single for metal doors also carries a 3/4 inch throw. The International Door Closers FB-1202 has a 5/8 inch throw with a 1/8 inch offset and a 7/8 inch backset, a square end, and comes with a guide. If the frame or threshold you are bolting into is already prepped, match the throw and backset to that prep.

A two point unit secures the inactive leaf at both the head and the sill from one mechanism. The Adams Rite MS1880/MS1881 are two point flushbolts with an interlock mechanism, and the MS2180 series is an auto release two point flushbolt with a Smartlock mechanism. A single bolt such as the ABH 1855S manual flush bolt single, or the Delaney 6 inch brass bolt, secures at one point, so a pair of doors that needs top and bottom engagement takes two bolts or one two point assembly. Which way you go depends on whether the opening is specified for a single interlocked mechanism.

The International Door Closers FB-1202 is supplied with a guide and uses a positive U joint actuator, with a 5/8 inch throw, 1/8 inch offset and 7/8 inch backset, square end. The ABH 1854 series manual flush bolt set for metal doors comes as a set with a fire bolt. If you are ordering for a crew that needs everything in one box for the inactive leaf, check which of these ships as a set versus a single bolt like the ABH 1855S.