Adams Rite 1870HM Cylinder-Ope...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$222.36
$140.68
Adams Rite 1870HM Cylinder-Operated Flushbolt for Paired Hollow Metal Doors

Adams Rite 1870HM Cylinder-Operated Flushbolt for Paired Hollow Metal Doors

(2 reviews) Write a Review

Model: ADA-1870HM-628
Selected Finish is

In Stock (leaves warehouse same day if ordered before 3pm ET)

$222.36
$140.68
Adding to cart… The item has been added
Free Shipping on orders over $199
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

Adams Rite 1870HM Cylinder-Operated Flushbolt for Paired Hollow Metal Doors

Professional Key-Controlled Security for Inactive Door Leaves

The Adams Rite 1870HM Cylinder-Operated Flushbolt provides building management with key control over the inactive leaf of paired hollow metal doors, preventing unauthorized casual locking. This professional-grade flushbolt features a hexagonal 3/8" bolt with 11/16" throw and accepts any standard 1" length mortise cylinder with MS cam. The unit measures 7/8" x 6" x 1-21/32" and may be installed to lock at threshold or header for maximum security flexibility.

Professional Features & Benefits

  • Specifically engineered for narrow stile aluminum doors
  • Hollow metal and wood door options available
  • Accepts standard Adams Rite MS® cam mortise cylinders
  • Multiple finish options: US3, US4, US10B, US32, US32D
  • UL Listed models available
  • Compatible with Adams Rite electric strikes for access control
  • An ASSA ABLOY Group brand

Technical Specifications

  • For complete technical specifications, contact Adams Rite at 1-800-626-7590 or visit adamsrite.com.

Installation & Operation

  1. Review manufacturer specifications and verify door preparation requirements including door thickness, stile width, and handing as applicable to this product.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and/or frame surfaces.
  3. Prepare door and frame by drilling required holes and routing as specified in manufacturer instructions.
  4. Install all mounting hardware and secure the device to door and frame per manufacturer torque specifications.
  5. Adjust operational components for proper alignment, latching, and smooth operation throughout the full range of motion.
  6. Test device operation to verify proper function and make final adjustments as needed. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

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

Cylinder and Accessory Options

The 1870HM accepts standard 1" length mortise cylinders including the 4036 Mortise Cylinder and 4066 Thumbturn (sold separately). Additional accessories include the 4104 Mounting Bridge, 91-0965 Mounting Kit for radiused doors, 91-0966 Mounting Kit for beveled doors, 26-00090XX Tube Spacer, and MS4043 Cylinder Guard for enhanced security applications.

Why Choose Adams Rite Quality?

Adams Rite flushbolt products deliver professional-grade reliability with corrosion-resistant steel construction and stainless steel components engineered for demanding commercial applications. The 1870HM features the proven over-center action mechanism used in MS pivoted bolt deadlocks, ensuring dependable performance where security control is essential. Backed by a comprehensive 5-year warranty for added confidence in high-traffic commercial installations.

Product Specs

Subcategory:
Flushlocks
Product Group:
Door Trim and Accessories
Series:
1870 Series
Cylinder Included:
No
Warranty:
5 Year
Product Subgroup:
Flush Bolts
Commercial/Residential:
Commercial
Cylinder and Keyways:
Mortise Cylinder
Product Model:
1870HM
Product Dimension:
7/8" x 6" x 1 21/32"
Face Plate:
1" x 8"
Door Strike:
2 1/4" x 15/16"
Product Category:
Door Trim and Accessories
Backset (Distance):
1-1/4"
Department:
Door Hardware
Product Type:
Flush Bolts

Adams Rite ADA-1870HM-628 – Frequently Asked Questions

1) Will the Adams Rite 1870HM flush bolt work on paired hollow metal doors, or is it only for aluminum storefront?
The 1870HM is the hollow metal version of the 1870 cylinder-operated flushbolt, and it mounts in the inactive leaf of a pair of hollow metal doors. It works on a 1-1/4 inch backset, so the door prep has to put the bolt centerline 1-1/4 inches back from the edge. The bolt body takes a 7/8 x 6 x 1-21/32 inch mortise pocket and the face plate covers 1 x 8 inches. Adams Rite builds the same 1870 family for narrow stile aluminum and for wood, so if the pair you are working on is not hollow metal, order the matching version rather than this one.
2) Why use a key-operated flush bolt instead of a standard manual lever flush bolt on the inactive leaf?
A standard manual flushbolt lets anyone throw the inactive leaf with a finger, which is how a pair of doors ends up locked down when it should not be. The 1870HM puts that under key control with a mortise cylinder, so only staff with the key can secure or release the inactive leaf. If you do not need that control and just want a plain manual bolt, a simpler unit like the Ives FB358 manual flush bolt or the Trimco 3999 corner mount flushbolt does the same mechanical job without a cylinder.
3) Can the Adams Rite 1870HM lock into the head frame instead of the threshold?
Either one. The 1870HM can be installed to lock at the threshold or at the header, so you can choose based on where you want the strike and what the floor condition allows. Wet or uneven floors, carpet transitions, or a threshold you cannot cut are all reasons to take it to the head instead. The strike prep is 2-1/4 x 15/16 inches wherever you put it, and the bolt throws 11/16 inch of a 3/8 inch hex bolt.
4) What else do I need to order with an Adams Rite 1870HM besides the flushbolt itself?
At minimum a 1 inch mortise cylinder with an MS cam, since none is included. Adams Rite lists the 4036 mortise cylinder and 4066 thumbturn for that. Beyond the cylinder, the 4104 mounting bridge, the 91-0965 mounting kit for radiused doors, the 91-0966 kit for beveled doors, the 26-00090XX tube spacer, and the MS4043 cylinder guard are the accessories that come up. The two mounting kits are the ones to watch: if the door edge is radiused or beveled rather than square, the flushbolt will not sit right without the matching kit.
5) Can I replace a plain manual flush bolt on my inactive leaf with the Adams Rite 1870HM?
Treat it as a new prep rather than a swap. The 1870HM works on a 1-1/4 inch backset with a 1 x 8 inch face plate and a 7/8 x 6 x 1-21/32 inch body, and it needs a cylinder hole through the door face that a manual bolt never had. Manual bolts in this class run different backsets, the International Door Closers FB-1202 for example is a 7/8 inch backset, so the existing mortise and face cutout will rarely line up. Measure the old face plate and backset before you commit to a straight replacement.
6) Is the Adams Rite 1870HM an automatic flush bolt that releases when the active leaf closes?
No. It is a manual, key-operated bolt using an over-center action mechanism, the same one Adams Rite uses in the MS pivoted bolt deadlocks. Someone has to key it to throw it and key it to retract it. If you need the inactive leaf to release on its own when the active leaf opens, which is what egress on a pair usually requires, look at an automatic set instead, the Ives FB41 for wood doors or the ABH 1860P/1862P pair.
7) What should I use instead of the Adams Rite 1870HM on a fire rated pair of doors?
The 1870HM is a cylinder-operated flushbolt for paired hollow metal doors, controlled by key rather than by a latching action tied to the active leaf. On an opening where a fire rating governs the inactive leaf, the peers written for that duty are the ABH 1860P/1862P automatic flush bolt pair, which is fire rated 3-hour with a thermal lock, the ABH 1854 manual flush bolt set with fire bolt for metal doors, and the ABH 1858 universal bottom fire bolt. The Ives FB41 automatic flush bolt set for wood doors carries a 90 minute fire rating. Confirm the rating required by the opening against the door and frame label before selecting.
8) Can the Adams Rite 1870HM be used on a pair of wood doors?
The 1870HM is built for paired hollow metal doors, and the 1870 series is engineered around narrow stile aluminum doors with hollow metal and wood door options offered as separate models. For a wood pair, the flush bolts written for that substrate are the Ives FB41 automatic flush bolt set for wood doors with a 3/4 inch throw, the Ives FB42 top automatic flush bolt for wood doors with an auxiliary fire latch, and the Delaney 4108 6 inch square end solid brass flush bolt. Those are hand or auto operated rather than key operated, so key control over the inactive leaf goes away with the change.
9) Is the Ives FB358 flush bolt the same thing as the Adams Rite 1870HM?
No. Both are flush bolts for the inactive leaf, but they are different devices. The Ives FB358 is a manual flush bolt with a 3/4 inch throw and a 1/2 inch bolt diameter, thrown by hand at the bolt. The Adams Rite 1870HM is cylinder operated, uses a hexagonal 3/8 inch bolt with an 11/16 inch throw, and accepts a standard 1 inch mortise cylinder with an MS cam, which is what gives building management key control over the leaf. The 1870HM also has a 1-1/4 inch backset, a 1 inch by 8 inch face plate, and a 2-1/4 inch by 15/16 inch strike. If the door is already prepped for one, it is not prepped for the other.
10) What size strike cutout do I need for an Adams Rite 1870HM flush bolt?
The strike measures 2-1/4 x 15/16 inches, and the bolt that drops into it is a 3/8 inch hex with an 11/16 inch throw. That 11/16 inch of throw is what tells you whether an existing strike or dust proof pocket in the sill will take it. If you are dropping this into a prep left by a different bolt, measure the pocket depth first, since bolts in this class commonly throw 5/8 or 3/4 inch and the prep will not always match.
11) Will an Adams Rite 1870HM flush bolt fit a wood door or a residential door pair?
The 1870HM is the hollow metal build and it is a commercial part. Adams Rite makes the 1870 in wood and narrow stile aluminum versions too, so specify the one that matches the leaf. For residential or lighter wood pairs, a solid brass bolt like the Delaney 4108 6 inch square end flush bolt or the Delaney 4101 7 inch slide type mortise flush bolt is the usual choice, and the Emtek flush bolts cover the same territory.
12) Can the Adams Rite 1870HM be keyed into the same key system as the rest of my building?
Yes, because the cylinder is yours to choose. The 1870HM takes any standard 1 inch mortise cylinder with an MS cam, so you order it in your existing keyway and hand it to the keying schedule like any other opening. Adams Rite's 4036 mortise cylinder is the factory match. If the bolt is on an exterior facing pair where the cylinder is reachable, the MS4043 cylinder guard is the accessory that protects it.
13) What is the difference between an automatic flush bolt and the key-operated Adams Rite 1870HM?
An automatic flush bolt throws and releases with the movement of the active leaf, so nobody has to touch it. The ABH 1860P/1862P is an automatic flush bolt pair, and the Ives FB42 is a top automatic flush bolt for wood doors with an auxiliary fire latch. The Adams Rite 1870HM works the opposite way on purpose: it is thrown and released with a mortise cylinder so the inactive leaf cannot be casually locked by anyone without a key, and it can be installed to lock at either the threshold or the header. Choose the automatic bolts when the inactive leaf should secure itself on every close, and the 1870HM when who locks that leaf needs to be controlled.
14) Which flush bolt has a longer reach than the Adams Rite 1870HM for a tall inactive leaf?
The Adams Rite 1870HM body measures 7/8 inch by 6 inches by 1-21/32 inches with a 1 inch by 8 inch face plate, and it is installed to lock at the threshold or the header. Where the bolt has to span from a mid-height mounting point up to the frame, the Ives FB457 is a manual flush bolt with a 12 inch rod length for metal doors, and the Delaney 4363 is a 7 inch mortise extension flush bolt. Both are hand operated rather than key operated.
15) Will a flush bolt with a 7/8 inch backset drop into the same door prep as the Adams Rite 1870HM?
No. The Adams Rite 1870HM is prepped for a 1-1/4 inch backset with a 1 inch by 8 inch face plate. The International Door Closers FB-1202 is a positive U joint actuator flush bolt with a 5/8 inch throw, a 1/8 inch offset and a 7/8 inch backset, square end, with guide. The backset difference means the bolt centerline sits in a different place in the stile, so the existing mortise and the strike location have to be verified before treating one as a drop-in for the other.
16) What finishes does the Adams Rite 1870HM flushbolt come in?
Three anodized finishes: 313 dark bronze, 335 black, and 628 clear aluminum. Those are the standard storefront and hollow metal finishes, so 628 clear will read alongside mill finish aluminum and 313 dark bronze against a bronze door package. If you are standardizing a building, pick one and carry it across every pair, because anodized dark bronze varies enough between orders that mixing lots on adjacent openings shows.
17) I need a flush bolt for a decorative interior double door, not a commercial metal pair. What are the options besides the Adams Rite 1870HM?
The Adams Rite 1870HM is a commercial device for paired hollow metal doors and comes in anodized architectural finishes, 313 dark bronze anodized, 335 black anodized and 628 clear anodized. For a decorative interior pair, the Delaney 4108 is a 6 inch square end solid brass flush bolt, the Delaney 4101 is a 7 inch slide type mortise in flush bolt, and Emtek offers flush bolts as well. Those are manual bolts without cylinder operation, so they secure the inactive leaf but do not give key control over it.
How fast can I get the Adams Rite ADA-1870HM-628 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 Adams Rite ADA-1870HM-628 come with a warranty?
Absolutely. The Adams Rite ADA-1870HM-628 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 Adams Rite ADA-1870HM-628?
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 Adams Rite ADA-1870HM-628 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.

Product Reviews

  • 5
    EXCELLENT

    Posted by Loreain Gonzalez on Jan 27th 2026

    excellent

  • 5
    EXCELLENT

    Posted by Loreain Gonzalez on Jan 27th 2026

    Zen Supply always at the forefront with the best products.

!