Cal-Royal UNIFB820 Universal A...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$191.26
Cal-Royal Cal-Royal UNIFB820 Metal and Wood Door Universal Flush Bolts CAL-UNIFB820

Cal-Royal UNIFB820 Universal Automatic Flush Bolts for Metal and Wood Doors

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Model: UNIFB820-US26
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Cal-Royal UNIFB820 Universal Automatic Flush Bolts for Metal and Wood Doors

The Cal-Royal UNIFB820 is a set of universal automatic flush bolts engineered for use on both metal and wood door applications. Each set includes 2 auto flush bolts featuring a 1 1/8" x 2 1/4" face plate, a 1/2" round bolt head, and a 3/4" bolt throw for dependable engagement into the header and floor strikes. Manufactured to meet ANSI/BHMA A156.3-2008, Type 25 requirements, this hardware is built for commercial door openings that demand consistent, code-compliant performance across metal and wood substrates.

Key Features

  • Face Plate Dimensions: 1 1/8" x 2 1/4" face plate provides a clean, low-profile fit into the door edge.
  • Bolt Head Design: 1/2" round bolt head delivers reliable engagement with corresponding strikes.
  • Bolt Throw: 3/4" bolt throw ensures secure extension into the header and floor for stable door positioning.
  • Complete Set Included: Includes 2 auto flush bolts per set for top and bottom door engagement in a single package.
  • Universal Door Compatibility: Designed for use on both metal and wood doors, offering flexible installation across varied door construction types.
  • Fastener Included: Supplied with # 8 x 3/4" fasteners sized for secure mounting to the door edge.
  • Automatic Operation: Auto flush bolt design simplifies operation on inactive leafs of pairs of doors in commercial openings.
  • Certified Performance: Manufactured to meet ANSI/BHMA A156.3-2008, Type 25 standards for verified commercial-grade quality.

Certifications & Compliance

  • ANSI/BHMA A156.3-2008, Type 25

Technical Specifications

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

Typical Applications

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

Why Cal-Royal UNIFB820?

Cal-Royal flush bolt products deliver professional-grade reliability with precise 1/2" round bolt heads and 3/4" bolt throw engineered to meet ANSI/BHMA A156.3-2008, Type 25 standards. Built for universal application across metal and wood doors, the UNIFB820 is engineered for demanding commercial door openings where dependable, code-compliant performance is essential.

Product Specs

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

Cal-Royal UNIFB820-US26 – Frequently Asked Questions

1) Will Cal-Royal UNIFB820 flush bolts work on a wood door, or are they only for hollow metal?
Both. The UNIFB820 is a universal automatic flush bolt set built for metal and wood door applications, which is the point of the "UNI" designation. Most flush bolt lines split into a metal-door version and a wood-door version with different face plates and bolt assemblies, so you have to order the right one for the leaf. Here you order one part for either substrate. If your pair is mixed, say a hollow metal frame with wood leaves, the same set covers it.
2) What is included in a UNIFB820 set, and do I need two sets for a pair of doors?
One UNIFB820 set covers one inactive leaf: it ships with 2 auto flush bolts, one for the top of the door and one for the bottom, plus # 8 x 3/4 inch mounting fasteners. A standard pair of doors has one inactive leaf, so one set per pair is what you order. What is not in the box is the strike hardware, so the header strike and the floor strike are separate line items.
3) Will a 3/4 inch throw auto flush bolt reach my existing header and floor strikes?
The UNIFB820 throws 3/4 inch with a 1/2 inch round bolt head, which is the standard pairing on commercial flush bolts and the same throw the Ives FB41 automatic set for wood doors and the Ives FB358 manual bolt use. If you are swapping out bolts and keeping the strikes, a 3/4 inch throw into a 1/2 inch round hole drops in. Where it gets tight is an undercut bottom door or a thick floor covering added after the original install, because the bottom bolt has only that 3/4 inch to cross the gap before it engages.
4) What size mortise pocket do I need to rout for the UNIFB820?
The face plate is 1 1/8 x 2 1/4 inches, so that is the cutout footprint in the door edge, with the bolt case mortised in behind it. On a wood leaf a router and template get it; on hollow metal you are working to the manufacturer's edge prep. The 1 1/8 inch face dimension means a door edge narrower than that will not take the plate, which rules out most narrow stile aluminum leaves.
5) Is the Cal-Royal UNIFB820 fire rated for a labeled pair of doors?
Automatic flush bolts on a fire labeled pair also require an auxiliary fire latch or fire bolt on the inactive leaf, which is a separate component from the bolts themselves. If the opening carries a label, specify hardware sold as fire rated for that use: the ABH 1860P/1862P automatic flush bolt pair is listed as fire rated 3-hour with a thermal lock, the Ives FB41 automatic set for wood doors carries a 90 minute rating, and the Ives FB42 top automatic bolt for wood doors comes with an auxiliary fire latch. The ABH 1858 universal bottom fire bolt covers the bottom position.
6) Does the UNIFB820 meet the ANSI standard our specs call out for flush bolts?
It is manufactured to meet ANSI/BHMA A156.3-2008, Type 25. That is the exit device and auxiliary hardware standard, and Type 25 is the automatic flush bolt designation, so if the drawing calls for an A156.3 Type 25 automatic flush bolt this answers that line. Useful for school, healthcare, and government specs where the submittal has to name a BHMA type rather than just "auto flush bolts."
7) Can I use these flush bolts instead of a key operated flushbolt on an aluminum storefront pair?
No, and the substitution is the wrong direction. The UNIFB820 is a commercial mortise flush bolt for metal and wood doors with a 1 1/8 x 2 1/4 inch face plate, which needs a door edge that can take that prep. Narrow stile aluminum storefront leaves are usually handled with a cylinder operated or two point flushbolt built for that stile. The Adams Rite 1870 Series cylinder operated flushbolt with key control, or the MS1880/MS1881 two point flushbolts with interlock, are the ones to look at for key controlled paired leaves. The Adams Rite 1877 is the cylinder operated version for paired wood doors.
8) What is the closest automatic flush bolt equivalent to the Cal-Royal UNIFB820 for a pair of wood doors that needs a fire label?
The Ives FB41 is the closest automatic set to reach for when a fire rating has to be carried. The FB41 is an automatic flush bolt set for wood doors with a 3/4 inch throw, carrying a 90 minute fire rating. The Cal-Royal UNIFB820 matches that 3/4 inch bolt throw and is built to ANSI/BHMA A156.3-2008 Type 25, and it is a universal set that goes into metal or wood doors from the same box, so the trade is universal substrate coverage against the labeled 90 minute wood application.
9) If the inactive leaf only needs a bolt at the bottom, is there an alternative to buying a full automatic set?
Yes. The Cal-Royal UNIFB820 ships as a set of 2 auto flush bolts for top and bottom engagement in a single package, so it is bought as a pair whether or not both positions are used. Where only one position is being served, the ABH 1855S is a single manual flush bolt for metal doors with a 3/4 inch throw, and the ABH 1858 is a universal bottom fire bolt in manual operation. Both are single-position parts rather than a matched top-and-bottom set, and both are manual, so the inactive leaf is released by hand instead of automatically when the active leaf opens.
10) Which flush bolt should I use instead of the Cal-Royal UNIFB820 if the inactive leaf has to be key controlled?
An automatic flush bolt releases when the active leaf opens, so it is not the part for key control. 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 operation of the inactive leaf behind a cylinder rather than releasing on the swing of the active leaf, the way the Cal-Royal UNIFB820 auto flush bolt set does on the inactive leaf of a pair.
11) What is the difference between automatic flush bolts and manual flush bolts, and which do I need?
Automatic bolts like the UNIFB820 retract the inactive leaf bolts on their own when the active leaf opens and re-throw when it closes, so staff never touch them. Manual bolts, such as the ABH 1855S single or the Trimco 3999 corner mount, are levers someone has to flip by hand on the inactive leaf, which means that leaf stays bolted until a person deliberately releases it. Pick automatic where the inactive leaf gets opened regularly or where egress codes will not tolerate a bolt someone has to remember. Pick manual where the inactive leaf is essentially fixed and you want it to stay that way.
12) What finishes do the Cal-Royal UNIFB820 flush bolts come in, and which matches my existing door hardware?
Five finishes: US1 flat black, US3 polished brass, US10B antique bronze oiled, US26 polished chrome, and US32D satin stainless steel. For a building already standardized on brushed stainless lever sets and exit devices, US32D is the match, and it is the one that hides handling marks best on a high traffic pair. US26 polished chrome reads closest to older US26D-family chrome trim without being the satin version. If you are matching oil rubbed bronze entry hardware, US10B is the one.
13) Are Cal-Royal UNIFB820 flush bolts handed, or is one part good for left and right hand pairs?
No handing to specify. The UNIFB820 set is ordered by finish only, with no left or right hand option, because a mortise flush bolt drops into the edge of the inactive leaf the same way regardless of which leaf is inactive. What you do decide on site is which leaf of the pair is the inactive one, since that is where both bolts go.
14) I have a metal pair with a 12 inch rod flush bolt in it now. Can I replace it with the Cal-Royal UNIFB820?
Not without checking the prep. The Ives FB457 is a manual flush bolt with a 12 inch rod length for metal doors and carries a fire rating; that rod length means the door edge is mortised for a long bolt assembly reaching well into the leaf. The Cal-Royal UNIFB820 mounts behind a 1 1/8 inch by 2 1/4 inch face plate with a 3/4 inch throw and mounts with the supplied #8 x 3/4 inch fasteners, which is a shallower and shorter prep. Going the other direction, the ABH 1854 Series is a manual flush bolt set with a fire bolt for metal doors if the replacement needs to stay manual on a metal pair.
15) What is the difference between the Cal-Royal UNIFB820 and a 6 inch corner mount flush bolt like the Trimco 3999?
They are not interchangeable. The Cal-Royal UNIFB820 uses a 1 1/8 inch by 2 1/4 inch face plate with a 1/2 inch round bolt head and 3/4 inch throw, and it operates automatically. 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 in a square end; the Orca Hardware 86SQ is a 6 inch flush bolt with radius corners. Those are longer manual face plates that mortise into the corner of the leaf and are thrown by hand at the lever, so the door edge prep and the operation both differ from the short automatic face plate on the UNIFB820.
16) Is a 5/8 inch throw flush bolt an acceptable substitute for the Cal-Royal UNIFB820?
Check the strike depth before treating it as one. The International Door Closers FB-1202 is a flush bolt with a positive U joint actuator, a 5/8 inch throw, 1/8 inch offset with 7/8 inch backset, square end, supplied with a guide. The Cal-Royal UNIFB820 throws 3/4 inch into the header and floor strikes, so the FB-1202 extends 1/8 inch less bolt and is set to its own 7/8 inch backset. On an existing opening where the header and floor strikes are already cut for a 3/4 inch throw, the shorter throw and different backset change how the bolt sits in the strike.
17) What flush bolt handles two-point locking of the inactive leaf rather than separate top and bottom bolts?
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. Those tie the top and bottom bolt positions into one mechanism. The Cal-Royal UNIFB820 takes the other approach: 2 independent auto flush bolts per set, each with a 1 1/8 inch by 2 1/4 inch face plate, mortised separately into the top and bottom of the door edge.
18) For a wood pair that needs an auxiliary fire latch at the top only, what replaces the Cal-Royal UNIFB820?
The Ives FB42 is a top automatic flush bolt for wood doors with an auxiliary fire latch, and it carries a fire rating. That covers the top position on a wood pair where the auxiliary fire latch is required. The Cal-Royal UNIFB820 is supplied as a complete set of 2 auto flush bolts for both top and bottom, built to ANSI/BHMA A156.3-2008 Type 25 and usable on metal or wood, so it is the choice when both positions are being furnished at once from one part number.
19) Which automatic flush bolt lets me standardize one part number across both metal and wood pairs in a facility?
The Cal-Royal UNIFB820 is the universal one: a single automatic set engineered for both metal and wood door applications, built to ANSI/BHMA A156.3-2008 Type 25, with 2 auto flush bolts per set. Among the comparable automatic sets, the Ives FB41 is specified for wood doors and the ABH 1860P/1862P is an automatic pair with a 3 hour rating, so each is aimed at a narrower substrate or rating case. Standardizing on the UNIFB820 also holds one finish across the fleet, with US1 flat black, US3 polished brass, US10B antique bronze oiled, US26 polished chrome and US32D satin stainless steel available.
20) Is the UNIFB820 a residential grade flush bolt or built for commercial traffic?
Commercial. Cal-Royal classifies the UNIFB820 as commercial door hardware and builds it to the A156.3-2008 Type 25 standard, and the typical applications run to offices, schools, healthcare, retail, warehouse, multi-tenant residential, and municipal buildings. If you are doing a residential double door with decorative solid brass trim, a lighter surface bolt such as the Delaney 6 inch square end solid brass flush bolt or the Orca 6 inch flush bolt with radius corners is the usual choice there.
21) Why do my automatic flush bolts not throw when the inactive leaf closes?
Automatic bolts like the UNIFB820 throw off the active leaf striking the trigger on the inactive leaf, so the usual causes are alignment rather than the bolt. Check that the leaves are meeting square and that the active leaf is actually contacting the trigger, and check that the header and floor strikes line up with the bolt heads, because 3/4 inch of throw and a 1/2 inch round head leave no room for a strike that has drifted. A floor strike that has filled with debris or a floor finish added over it will stop the bottom bolt cold even when the mechanism is fine.
22) Will a solid brass or mortise slide flush bolt work in place of the Cal-Royal UNIFB820 on a commercial pair?
Those are a different class of part. The Delaney 7 inch slide type mortise in flush bolt, the Delaney 6 inch square end solid brass flush bolt, and the Delaney 7 inch mortise extension flush bolt are slide-operated mortise bolts with long face plates, and the Emtek flush bolts fall in the same decorative slide-bolt group. The Cal-Royal UNIFB820 is a commercial automatic set built to ANSI/BHMA A156.3-2008 Type 25 with a 1 1/8 inch by 2 1/4 inch face plate and a 3/4 inch throw, and it is offered in commercial finishes including US26 polished chrome and US32D satin stainless steel. The slide bolts are thrown by hand and cut a longer pocket in the door edge, so they are not a drop-in for the automatic prep.
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Does the Cal-Royal UNIFB820-US26 come with a warranty?
Absolutely. The Cal-Royal UNIFB820-US26 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 Cal-Royal UNIFB820-US26?
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