ABH 1856 Manual Flush Bolt Set...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$123.00
$120.87
ABH 1856 Manual Flush Bolt Set with Fire Bolt Protection for Wood Doors

ABH 1856 Manual Flush Bolt Set with Fire Bolt Protection for Wood Doors

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Model: ABH-1856-US10
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$123.00
$120.87
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ABH Manual Flush Bolt Set with Fire Bolt Protection for Wood Doors

Professional Fire-Rated Flush Bolt System for Wood Door Applications

The ABH Manual Flush Bolt Set provides reliable door leaf securing with integrated fire protection for wood door installations. This system features a 3/4" bolt throw with 3/4" backset design and includes both top manual bolt and bottom fire bolt components. When exposed to 230°F temperatures, the fire bolt automatically activates to lock door leaves together, providing critical fire safety protection without requiring floor preparation.

Professional Features & Benefits

  • Fire Safety Protection: Bottom fire bolt automatically engages at 230°F to lock door leaves together during fire conditions for enhanced safety.
  • No Floor Preparation Required: Bottom fire bolt design eliminates the need for floor prep work, simplifying installation and reducing labor costs.
  • Structural Door Integrity: Corner reinforcing plate maintains door strength and prevents weakening at bolt installation points.
  • Precision Bolt Operation: 3/4" bolt throw with 3/4" backset provides secure engagement with reliable manual operation.
  • Installation Tolerance: Oversize fire bolt strike hole accommodates slight door misalignment for easier installation and consistent operation.
  • Complete Hardware Package: Includes 7 ea. #8 x 3/4 FH Combo Screws, 4 ea. 8-32 x 1/2 FH MS, and 4 ea. #8 Counter Sunk Washers for complete installation.

Technical Specifications

  • Commercial/Residential: Commercial
  • Department: Door Hardware
  • Product Category: Door Trim and Accessories
  • Product Group: Door Trim and Accessories
  • Product Model: 1856
  • Product Subgroup: Flush Bolts
  • Product Type: Flush Bolts
  • Subcategory: Flush Bolts

Professional Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Retail Establishments
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • Government and Municipal Buildings

Why Choose ABH Quality?

ABH flush bolt systems deliver professional-grade reliability with corner reinforcing plate construction and automatic fire protection activation at 230°F. Engineered for demanding commercial applications where dependable performance and fire safety compliance are essential.

Manufacturer Resources

ABH Full Line Catalog

Product Specs

Product Group:
Door Trim and Accessories
Product Subgroup:
Flush Bolts
Product Type:
Flush Bolts
Subcategory:
Flush Bolts
Commercial/Residential:
Commercial
Product Model:
1856
Product Category:
Door Trim and Accessories
Department:
Door Hardware

ABH ABH-1856-US10 – Frequently Asked Questions

1) Will the ABH 1856 flush bolt set work on a pair of wood doors without cutting a hole in the floor?
Right, no floor prep. The 1856 set pairs a top manual bolt with a bottom fire bolt, and the bottom fire bolt is built so no floor preparation is needed. That is the practical difference from a conventional bottom flush bolt, which wants a drilled floor strike or a dust proof strike set into the threshold. On a finished slab, terrazzo, or tile you save the core drilling entirely.
2) How does the fire bolt on the ABH 1856 actually work in a fire?
Heat triggers it. At 230 degrees F the bottom fire bolt engages on its own and locks the two door leaves together, so the inactive leaf stays put even if nobody threw the bolt manually. The top bolt stays manual and is what you operate day to day. That combination is why the set is specified on paired wood openings where the inactive leaf has to hold under fire conditions.
3) What is the bolt throw and backset on the ABH 1856 flush bolt, and will it catch my existing frame strike?
Three quarters of an inch of throw, with a 3/4 inch backset. The 3/4 inch backset is the dimension that decides whether it lands in your existing head strike, since it sets how far the bolt sits in from the door edge. The fire bolt strike hole is oversized on purpose to take up slight misalignment between the leaves, so a door that hangs a touch out of true still engages.
4) Should I use a manual flush bolt or an automatic one on a pair of doors?
Manual bolts like the ABH 1856 are thrown by hand, so the inactive leaf stays locked until someone deliberately releases it. That suits an opening where the second leaf is only opened to move furniture or equipment. Automatic flush bolts release the inactive leaf when the active leaf opens, which is what you want when both leaves get used in normal traffic. For a wood pair where you want that automatic behavior, the Ives FB41 is an automatic flush bolt set for wood doors, and the Ives FB42 is a top automatic bolt for wood doors with an auxiliary fire latch.
5) The ABH 1856 is for wood doors - what is the equivalent manual flush bolt for a hollow metal pair?
The Ives FB457 is a manual flush bolt with a 12 inch rod length built for metal doors, and it carries a fire rating. The ABH 1856 set is specified for wood doors, and every configuration of it is a wood door application. Wood and metal flush bolts differ in the bolt case and the mounting prep the door edge accepts, so a wood door bolt is not the part to order for a hollow metal leaf. Order the metal door bolt for metal leaves and the ABH 1856 for the wood pairs on the same job.
6) I need to lock the inactive leaf with a key from outside - is the ABH 1856 the right bolt?
No. The ABH 1856 top bolt is operated by hand at the door edge, with the bottom fire bolt acting on its own at 230 degrees F. For key control on the inactive leaf, the Adams Rite 1877 is a cylinder-operated flushbolt for paired wood doors, and the Adams Rite 1870 Series is a cylinder-operated flushbolt with key control. Those take a cylinder so the leaf can be secured and released by an authorized key rather than by anyone standing at the open pair.
7) What should I use instead of a manual flush bolt on wood doors when the inactive leaf has to release automatically as the active leaf opens?
Look at the Ives FB41 automatic flush bolt set for wood doors, which uses a 3/4 inch throw and carries a 90 minute fire rating, or the Ives FB42 top automatic flush bolt for wood doors with an auxiliary fire latch. Both are automatic: the bolt retracts through the door action rather than being thrown by hand. The ABH 1856 is a manual set - the top bolt is operated by hand and the bottom fire bolt engages on its own at 230 degrees F. If your opening requires the inactive leaf to free itself without anyone reaching for the bolt, the automatic sets are the right family; if the inactive leaf stays dogged down and is only released deliberately, the manual 1856 set is what you want.
8) What is a simpler flush bolt than the ABH 1856 for a non-rated interior wood pair?
On an opening with no fire requirement, a plain corner or mortise bolt does the job. The Trimco 3999 is a 6 inch corner mount flushbolt with a rounded end and the Trimco 3999SE is the same 6 inch corner mount with 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. Each is a single bolt with no fire component. The ABH 1856 goes further - it is a set with a top manual bolt plus a bottom fire bolt that locks the leaves together at 230 degrees F, and it includes a corner reinforcing plate to keep the door from weakening at the bolt pocket. If the drawing calls for fire protection at that pair, stay with the 1856.
9) Do I need to order screws or a strike separately with the ABH 1856 flush bolt set?
The fasteners come in the box: 7 each #8 x 3/4 flat head combo screws, 4 each 8-32 x 1/2 flat head machine screws, and 4 each #8 countersunk washers. A corner reinforcing plate is part of the set as well, which keeps the door from being weakened where the bolt is let in.
10) Is the ABH 1856 the same thing as a standard 6 inch corner mount flush bolt?
No, and it is worth knowing the difference before you substitute. A plain corner mount bolt like the Trimco 3999 or the Orca 6 inch flush bolt is a single bolt with a face plate, ordered one per position. The 1856 is a two piece set, top manual bolt plus a heat activated bottom fire bolt, with a corner reinforcing plate. If the opening only needs to hold a leaf shut and has no fire bolt requirement, a corner mount bolt is the simpler buy. If the bottom leaf has to lock itself under fire conditions, the corner mount bolt does not do that.
11) What is the difference between the ABH 1856 flush bolt set and a two-point flush bolt like the Adams Rite MS1880?
The Adams Rite MS1880/MS1881 are two-point flushbolts with an interlock mechanism, and the Adams Rite MS2180 Series is an auto-release two-point flushbolt with a Smartlock mechanism - both drive top and bottom from a single linked action. The ABH 1856 is a manual set where the top bolt is thrown by hand and the bottom is a fire bolt that engages at 230 degrees F on its own, with an oversize fire bolt strike hole to take up slight door misalignment. The two-point units tie the two bolts together mechanically; the 1856 keeps them independent, which is why it needs no floor prep at the bottom.
12) Is a mortise-in flush bolt like the Delaney 4101 a substitute for the ABH 1856?
They solve the same problem differently. 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 - both mortise into the door edge and are worked by a slide. The ABH 1856 set carries a 3/4 inch bolt throw with a 3/4 inch backset and includes a corner reinforcing plate that keeps the door from weakening where the bolt goes in. If the pair is fire rated, the 1856 bottom fire bolt engaging at 230 degrees F is the reason to specify it over a plain mortise bolt.
13) How does the bolt throw on the ABH 1856 compare with the International Door Closers FB-1202?
The IDC FB-1202 is a square end flush bolt with a positive U joint actuator, a 5/8 inch throw, a 1/8 inch offset with a 7/8 inch backset, and a guide. The ABH 1856 set uses a 3/4 inch bolt throw with a 3/4 inch backset. The backset difference changes where the bolt centerline falls on the door edge, and the throw difference changes how deep the strike pocket in the head and the sill needs to be, so the two are not a drop-in swap for one another on prepped doors.
14) What finishes does the ABH 1856 flush bolt come in so I can match the other door hardware in my building?
Eight finishes: painted black, satin chrome, bright stainless steel, satin stainless steel, satin brass, bright brass, satin bronze, and oil rubbed bronze. On a bolt this is mostly the face plate you see at the top of the leaf, so match it to the hinges and edge hardware already on the openings rather than to the lever finish if those differ.
15) Is the ABH 1856 flush bolt suitable for a commercial building or is it a residential part?
Commercial. ABH lists the 1856 as commercial hardware, and it is specified into office buildings, schools, hospitals, retail, warehouses, multi tenant residential, and government facilities. For a residential wood pair where the fire bolt is not needed, a simpler surface or mortise bolt such as the Delaney 6 inch square end solid brass flush bolt covers the job.
16) For a residential-looking wood pair where the bolt will be seen, what are the alternatives to the ABH 1856?
The Delaney 4108 is a 6 inch square end solid brass flush bolt and the Emtek Flush Bolts are a decorative-market flush bolt line; both suit an opening where appearance drives the choice. The ABH 1856 is a commercial flush bolt set and comes in Bright Brass, Satin Brass, Oil Rubbed Bronze, Satin Bronze, Satin Chrome, Bright Stainless Steel, Satin Stainless Steel, and Painted Black, so it can be matched to a finish schedule as well - and it brings the bottom fire bolt that engages at 230 degrees F, which the decorative bolts do not.
How fast can I get the ABH ABH-1856-US10 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the ABH ABH-1856-US10 come with a warranty?
Absolutely. The ABH ABH-1856-US10 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the ABH ABH-1856-US10?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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