Cal-Royal MB85R 6" Brass Secur...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$14.36
Cal-Royal Cal-Royal MB85R - 6" Brass Security Bolt, Round End, 1" Throw CAL-MB85R

Cal-Royal MB85R 6" Brass Security Surface Bolt, Round End, 1" Throw

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Model: MB85R-26D
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$14.36
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Cal-Royal MB85R 6" Brass Security Surface Bolt, Round End, 1" Throw

The Cal-Royal MB85R is a 6" brass security surface bolt engineered for superior strength and smooth, reliable operation on commercial doors. Featuring a round end design with a 1" throw, this surface bolt has a body size of 3/4" x 6" x 1-1/4" and a bolt diameter of 1/2", making it a durable choice for door trim and security accessory applications. Rated BHMA L04151, the MB85R includes a matching strike and fastener for complete installation, with architectural finishes available to match surrounding hardware.

Key Features

  • Body Size: 3/4" x 6" x 1-1/4" for a robust, commercial-grade surface bolt profile.
  • Bolt Diameter: 1/2" solid bolt construction for reliable engagement and security.
  • 1" Throw: Provides secure bolt projection for dependable locking performance.
  • Round End Design: Clean, finished appearance suited to a variety of door styles.
  • Strike Dimension: 15/16" x 1-15/16" matching strike included with fastener for a complete, ready-to-install set.
  • Deep Cup Finger Hole with Double Action Spring: Combine to assure ease of operation and automatic holding of the bolt in either the projected or retracted position.
  • Superior Strength and Smooth Operation: Designed for reliable, long-term performance in commercial door applications.
  • Architectural Finishes Available: Allows the bolt to be matched to surrounding door hardware finishes.

Certifications & Compliance

  • BHMA L04151

Technical Specifications

  • Product Group: Door Trim and Accessories
  • Product Subgroup: Surface Bolts
  • Product Type: Flush Bolts
  • Subcategory: Flush Bolts
  • Commercial/Residential: Commercial
  • Body Size: 3/4" x 6" x 1-1/4"
  • Bolt Diameter: 1/2"
  • Product Model: MB85R
  • Strike Dimension: 15/16" x 1-15/16"
  • 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 MB85R?

Cal-Royal MB85R surface bolts are built with a solid brass construction, a deep cup finger hole, and double action spring for dependable, smooth operation in commercial door applications. Backed by a BHMA L04151 rating, this bolt is engineered to deliver secure holding in both the projected and retracted positions where dependable performance is essential.

Product Specs

Product Group:
Door Trim and Accessories
Product Subgroup:
Surface Bolts
Product Type:
Flush Bolts
Subcategory:
Flush Bolts
Commercial/Residential:
Commercial
Body Size:
3/4" x 6" x 1-1/4"
Bolt Diameter:
1/2"
Product Model:
MB85R
Strike Dimension:
15/16" x 1-15/16"
Product Category:
Door Trim and Accessories
Department:
Door Hardware

Cal-Royal MB85R-26D – Frequently Asked Questions

1) Will the Cal-Royal MB85R surface bolt work on a pair of doors where I need to hold the inactive leaf?
That's exactly what the MB85R is for. It's a 6 inch surface-mounted security bolt that screws to the face of the inactive leaf and throws a 1/2 inch diameter bolt 1 inch into a matching strike, holding that leaf fixed so the active leaf latches against it. Because it surface mounts, there's no mortise pocket to rout, which makes it the practical choice on doors already hung. Mount it at the head into a strike on the frame, or at the sill into a floor strike. Note it is manually operated, not automatic, so someone has to retract it by hand before the inactive leaf will swing.
2) Surface bolt or flush bolt for an inactive door leaf, which one should I be buying?
It comes down to whether you can cut into the door. A surface bolt like the Cal-Royal MB85R screws onto the face of the door with no mortising, so it's the retrofit answer on doors already installed and it's serviceable without pulling the leaf. A mortised flush bolt sits inside the edge of the door and disappears when retracted, which is cleaner looking and out of reach of casual tampering, but it needs a routed pocket and is usually specified before the door is hung. ZenSupply carries mortise style options including the Delaney 7 inch slide type mortise in flush bolt and the Delaney 7 inch mortise extension in flush bolt if the flush route is what your spec calls for.
3) Can I use the Cal-Royal MB85R on a fire rated pair of doors?
The MB85R is a commercial security surface bolt with a 1 inch throw and 1/2 inch bolt diameter; it is rated BHMA L04151. When the opening carries a fire label and the inactive leaf has to latch automatically, buyers specify a fire rated bolt instead: the ABH 1860P/1862P automatic flush bolt pair is fire rated 3-hour with a thermal lock, the Ives FB41 automatic flush bolt set for wood doors carries a 90 minute fire rating, and the ABH 1854 series manual flush bolt set for metal doors includes a fire bolt. The Ives FB42 top automatic flush bolt for wood doors adds an auxiliary fire latch. Confirm the requirement on the door schedule before substituting either way.
4) What is the closest equivalent to the Cal-Royal MB85R 6 inch surface bolt in another brand?
The Trimco 3999 Flushbolt is the nearest match in form factor: it is a 6 inch corner mount flushbolt with a rounded end, the same 6 inch length and round end profile as the MB85R, whose body measures 3/4 inch x 6 inch x 1-1/4 inch. Orca Hardware also builds a 6 inch flush bolt with radius corners in the 86SQ series, and Delaney offers a 6 inch square end solid brass flush bolt if a squared face is acceptable. If the round end is the reason you specified the MB85R, the Trimco 3999 and the Orca 6 inch radius corner bolt are the two that keep that appearance.
5) Which flush bolt lets me control the inactive leaf with a key instead of by hand?
The MB85R throws by hand at the deep cup finger hole and has no cylinder provision. Where the inactive leaf must be locked down under 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. Choose between them by leaf material - the 1877 is the paired wood door version.
6) Is a mortised flush bolt the same thing as the Cal-Royal MB85R surface bolt?
No, and this is the substitution that most often comes back. The MB85R is a surface bolt: the 3/4 inch x 6 inch x 1-1/4 inch body mounts to the face of the door and needs no pocket routed into the door edge. A mortise flush bolt sets into the edge of the door and requires a routed pocket - the Delaney 7 inch slide type mortise in flush bolt and the Delaney 7 inch mortise extension flush bolt are both edge mortised. If the door is already prepped for a mortised bolt, a surface bolt leaves the pocket exposed; if it is not prepped, the surface bolt is the one that installs without door machining.
7) I want the inactive leaf to release automatically when the active door opens - what should I order instead of the MB85R?
The MB85R is a manually operated bolt: the deep cup finger hole with double action spring holds it in either the projected or retracted position, so someone has to throw and retract it by hand. For automatic release, the Adams Rite MS2180 series is an auto-release two-point flushbolt with a Smartlock mechanism, the Ives FB41 is an automatic flush bolt set for wood doors, and the ABH 1860P/1862P is an automatic flush bolt pair. Adams Rite MS1880/MS1881 is a two-point flushbolt with an interlock mechanism if you want the two bolts tied together.
8) Is a 1 inch throw enough to hold a door in a commercial building?
For an inactive leaf, yes. The MB85R throws a solid 1/2 inch diameter brass bolt a full 1 inch, which is a deeper engagement than most manual flush bolts in the class, several of which run 3/4 inch or less. Deeper engagement means the bolt stays seated when the leaf is pushed on. What it will not do is let you get away with a shallow strike hole; you need the full inch of depth behind the strike or you lose the benefit.
9) Will the Cal-Royal MB85R stay put, or does it drift out of position when the door slams?
It holds. The bolt uses a double action spring, so it snaps and locks into either the fully projected or the fully retracted position rather than sitting loose in between. That matters on a busy opening: a bolt that creeps down as the active leaf slams will eventually catch the floor or scar the threshold. The deep cup finger hole gives you enough purchase to throw it with a gloved hand.
10) What finishes does the Cal-Royal MB85R brass surface bolt come in, and can I match it to existing door hardware?
Seven finishes: US1 flat black, US5 antique brass, US10B antique bronze oiled, US15 satin nickel, US15A satin nickel oxidized, US26 polished chrome, and US26D satin chrome. Those are standard BHMA finish codes, so if you know what the existing levers or hinges on the opening are specified as, order the same code and it will read as a set. US26D satin chrome and US10B are the two that come up most on commercial work.
11) Do I need to order a strike and screws separately with the Cal-Royal MB85R?
No, the set ships complete. A matching 15/16 x 1-15/16 inch strike and the fastener come in the box, so one part number covers the install. The only thing you may need to add is a dustproof strike if you're bolting down into a finished floor rather than into a frame, since a floor application wants a strike that keeps grit out of the hole.
12) Is the Cal-Royal MB85R handed? Do I need to specify left or right?
No handing to specify. The MB85R is a surface bolt with a 6 inch body that mounts to the face of the door, so the same part works on a left or right leaf and can be installed pointing up at the head or down at the sill. The only choice you make when ordering is the finish.
13) I need a manual flush bolt for a hollow metal door pair, not a surface bolt. What else is there?
The MB85R is surface applied, so if the spec calls for a bolt mortised into a metal door edge, look at the ABH 1855 Series manual flush bolt single for metal doors with 3/4 inch throw, or the Ives FB457 manual flush bolt with a 12 inch rod length for metal doors when you need to reach a high head on a tall leaf. The ABH 1854 Series manual flush bolt set includes a fire bolt for metal doors. Those are edge mounted and need door prep; the Cal-Royal is the one you use when the doors are already hung and you can't rout them.
14) What's the difference between the Cal-Royal MB85R and an automatic flush bolt?
Operation. The MB85R is manual: you push the bolt down or up by hand every time, which suits an inactive leaf that stays closed most of the year, like the second leaf on a storeroom or loading pair. An automatic flush bolt retracts on its own when the active leaf opens, so the pair works as a two-leaf opening in daily use with no one having to remember. ZenSupply carries automatic sets including the Ives FB41 for wood doors and the ABH 1860P/1862P pair. If people are dragging carts or stock through that opening several times a day, go automatic; if the second leaf only opens for a delivery, the manual bolt is simpler and there's less to fail.
15) I need a flush bolt with a square end instead of a round end - what are my options?
The MB85R is a round end bolt. For a squared face, the Trimco 3999SE is the 6 inch corner mount square end version of the same 3999 family, and Delaney makes a 6 inch square end solid brass flush bolt at the same length. International Door Closers FB-1202 is also a square end bolt, with a 5/8 inch throw, 1/8 inch offset and 7/8 inch backset, and it ships with a guide. End style is cosmetic on the strike face, so match it to the other bolts already on your doors.
16) I need to secure the bottom of an inactive leaf on a metal door pair - is the MB85R the right part?
The MB85R is a commercial surface bolt that mounts to the door face, so it can be applied at top or bottom without door prep. Where the specification calls out a metal door assembly, the metal-door-specific options are the ABH 1855S manual flush bolt single for metal doors, the ABH 1854 series manual flush bolt set with fire bolt for metal doors, and the Ives FB457 with a 12 inch rod length for metal doors. The ABH 1858 is a universal bottom fire bolt with manual operation for the bottom position specifically.
17) Do I need a separate strike when I substitute a flush bolt for the Cal-Royal MB85R?
The MB85R comes as a complete set with a matching 15/16 inch x 1-15/16 inch strike and fastener, so nothing else is required to finish the installation. Peers vary in what arrives in the box: the ABH 1854 is sold as a flush bolt set, the Ives FB41 is an automatic flush bolt set, and the International Door Closers FB-1202 is supplied with a guide. The ABH 1855S is a single bolt rather than a pair. If you are replacing an MB85R with a bolt whose strike dimension differs from 15/16 inch x 1-15/16 inch, plan on cutting a new strike opening rather than reusing the existing one.
18) Is the Cal-Royal MB85R heavy duty enough for a school or hospital corridor door?
It's specified commercial, built in brass with a 1/2 inch solid bolt, and carries a BHMA L04151 rating. Cal-Royal lists it for office buildings, schools, healthcare, retail, industrial and warehouse, multi-tenant residential, and government work. Brass is the relevant point for a facility standardizing across many openings: it won't rust in a wet vestibule or a kitchen corridor the way a plated steel bolt can.
19) Will the Cal-Royal MB85R match the finish of the rest of my door hardware, or should I look at another brand?
The MB85R is offered in US1 Flat Black, US5 Antique Brass, US10B Antique Bronze Oiled, US15 Satin Nickel, US15A Satin Nickel Oxidized, US26 Polished Chrome, and US26D Satin Chrome, which covers most standard architectural finish schedules on a brass bolt. If your opening is residential-leaning decorative hardware, Emtek also lists flush bolts. For a solid brass bolt at the same 6 inch length, the Delaney 6 inch square end solid brass flush bolt is the closest material match, though it is square end rather than round.
How fast can I get the Cal-Royal MB85R-26D 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 Cal-Royal MB85R-26D come with a warranty?
Absolutely. The Cal-Royal MB85R-26D 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 MB85R-26D?
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
Why buy the Cal-Royal MB85R-26D from ZenSupply?
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