BEST 48H Series Mortise Deadlo...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$661.00
$391.63
BEST BEST 48H Standard Series Mortise Deadlock (M-Double Cylinder Function) 7-Pin Housing, Accepts all BEST Cores BES-48H-M

BEST 48H Series Mortise Deadlock with Double Cylinder Function and 7-Pin Housing

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Model: 48H7M626
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$661.00
$391.63
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BEST 48H Series Mortise Deadlock with Double Cylinder Function and 7-Pin Housing

Heavy-Duty Commercial Mortise Lock Solution

The BEST 48H Series Mortise Deadlock delivers professional-grade security with double cylinder function and 7-pin housing designed to accept all BEST interchangeable cores. This heavy-duty mortise lock features a 2 3/4" backset, 1" deadbolt throw, and robust construction with 0.095" cold rolled steel case measuring 3-3/8" x 4-3/16" x 1". The lock accommodates standard 1-3/4" thick doors with thick door configurations available up to 3" for versatile commercial applications.

Professional Features & Benefits

  • Heavy-Duty Steel Construction: 0.095" cold rolled steel case, cover, and armored front provide exceptional strength and durability for demanding commercial environments.
  • Enhanced Security Design: Solid one-piece stainless steel anti-friction latch offers 50% more surface contact with strike for superior strength and security performance.
  • Precision Engineering: Roller bearing hub mechanism ensures smooth, wear-resistant operation with enhanced cycle life and reduced strike wear.
  • Versatile Core Compatibility: 7-pin housing accepts all BEST interchangeable cores with solid machined cylinder rings and security screw protection against cylinder removal.
  • Field Reversible Operation: Non-handed design with reversible latch that rotates 180 degrees allows easy handing changes without opening the case.
  • Professional Installation Features: Self-aligning trim mechanism and armored front design enable fast, accurate installation with automatic door bevel alignment.
  • Enhanced Case Integrity: Four corner case cover screws plus interlocking armored front and cover design at the latch provide superior structural strength.
  • Visual Lock Status Indication: Clear "locked" and "unlocked" state indicators with optional padlock icon display for immediate status recognition.

Technical Specifications

Case: 0.095" cold rolled steel, 3-3/8" x 4-3/16" x 1". Steel is zinc dichromate plated for corrosion protection.
Faceplate: Brass or bronze material, 5-3/8" x 1-3/16" x 7/32" .
Strike: Brass, bronze, or stainless steel base material.
48HS1: Flat strike supplied standard, 3-1/2" x 1-1/8" x 3/32"
Fits standard door frame cut-out as specified in ANSI A115.5.
48HS2: Lipped strike supplied as option, 4-7/8" x 1-1/4" x 3/32". Fits standard door frame cut-out as specified in ANSI A115.1.
Backset: 2 3/4"
Door Thickness: Standard lock configuration designed for doors 1-3/4" thick. Thick door configuration available for doors up to 3" thick (specify thickness when ordering). NOTE: “R" function not available for thick door.
Deadbolt: Stainless steel, 1" throw
Trim: Cylinder and trim ring only.
Finishes: Available in all finishes offered for 45H.

Installation & Operation

  1. Review manufacturer specifications and verify door preparation requirements including door thickness (standard 1-3/4" or up to 3" for thick door configuration), mortise pocket dimensions, and handing as applicable to this product.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and frame surfaces for the 3-3/8" x 4-3/16" x 1" case dimensions.
  3. Prepare door and frame by cutting mortise pocket and drilling required holes per manufacturer specifications, ensuring proper clearance for the 1" deadbolt throw.
  4. Install the mortise case, armored front, and all mounting hardware, securing the device to door per manufacturer torque specifications with four corner case cover screws.
  5. Adjust operational components including the four-position hub toggle design for proper alignment, latching, and smooth operation throughout the full range of motion.
  6. Test device operation including deadbolt throw, latch function, and visual indicators 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

Why Choose BEST Quality?

BEST 48H Series mortise deadlocks deliver professional-grade reliability with heavy-duty 0.095" cold rolled steel construction and precision-engineered components designed for demanding commercial applications. The solid one-piece stainless steel latch provides 50% more surface contact for superior strength, while roller bearing hub mechanisms ensure smooth, wear-resistant operation. Engineered for demanding commercial applications where dependable security performance is essential.

Product Specs

Series:
48H
Standard Cylinder:
SFIC Prep Less Core
Duty Level:
Heavy Duty
Keyed Function:
Double Cylinder
Product Group:
Mechanical Locks
Product Subgroup:
Mortise Locks and Trim
Product Type:
Mortise Locks
Subcategory:
Mortise
Keyed:
Yes
Commercial/Residential:
Commercial
Lock Type:
Mortise
Product Attribute:
Mortise Locks
Electronic:
No
Product Category:
Mechanical Locks
Backset (Distance):
2 3/4"
Department:
Door Hardware

BEST 48H7M626 – Frequently Asked Questions

1) Will the BEST 48H mortise deadlock fit a 1-3/4 inch door?
Yes, 1-3/4 inches is the standard configuration for the 48H mortise deadlock. For anything thicker, up to 3 inches, you order the thick door configuration and state the actual door thickness on the order. One caveat on that: the "R" function is not offered in the thick door build. The mortise pocket has to take a case measuring 3-3/8 x 4-3/16 x 1 inches, and the backset is 2-3/4 inches.
2) Is the BEST 48H-M keyed on both sides, or is there a thumbturn inside?
Double cylinder, so it takes a key from both sides. There is no thumbturn on the 48H-M. That is what you want on a glass-lite door or any opening where someone could reach the inside, and it is what you do not want where egress code demands a turn on the room side. If you need a turn inside, look at a single cylinder deadbolt function instead.
3) Does the BEST 48H deadlock come with a cylinder, or do I supply my own core?
It ships SFIC prepped, less core. The 7-pin housing accepts all BEST interchangeable cores, so you add the cores keyed to your existing system. Trim is cylinder and trim ring only, no lever or knob, since this is a deadbolt-only case. Solid machined cylinder rings and a security screw guard against cylinder pulling.
4) Will the BEST 48H deadlock drop into an existing ANSI mortise frame prep?
The strike is what decides that. The 48HS1 flat strike comes standard at 3-1/2 x 1-1/8 x 3/32 inches and fits the standard frame cut-out per ANSI A115.5. The 48HS2 lipped strike is an option at 4-7/8 x 1-1/4 x 3/32 inches and fits the ANSI A115.1 cut-out. Match the strike to whichever prep is already in your frame and you will not be cutting steel. The deadbolt is stainless with a 1 inch throw, so make sure the strike pocket is deep enough behind it.
5) What is the closest cross-brand equivalent to the BEST 48H double cylinder mortise deadlock?
The Sargent 4874 is the nearest match. It is a double cylinder mortise deadbolt with a 2-3/4 inch backset, the same backset the BEST 48H uses, and the same double cylinder keyed function - key operation from both sides with no thumbturn. The difference that matters when ordering is the cylinder: the BEST 48H comes with SFIC prep less core in a 7-pin housing that accepts BEST interchangeable cores, so if the building is already keyed on a BEST small format core system the 48H drops into that keying scheme and the Sargent 4874 would need its cylinders addressed separately.
6) I need a mortise deadbolt but not one that has to be keyed from both sides - what else is there?
Double cylinder means a key is required from the inside as well as the outside, which many egress codes will not permit on an occupied space. The Kaba Ilco 185 Series is a mortise lock in a deadbolt function and carries no handing, which simplifies stocking across a mixed set of openings. Where the requirement is simply an inside-operated bolt, a mortise thumbturn such as the Sargent 130KB, an 8200 Series thumbturn, or the Sargent 130W with a round backplate covers the interior side. Confirm the egress requirement for the opening before committing to a double cylinder bolt.
7) Will a BEST 48H work as a substitute for a mortise lockset on a door that also needs a latch?
No. The 48H is a deadlock - it throws a 1 inch stainless steel deadbolt and its trim is cylinder and trim ring only, so there is no lever or knob and nothing holds the door closed between throws. A door that needs latching plus keyed control takes a full mortise lockset instead: the Cal-Royal NM8080 is a Grade 1 storeroom mortise lockset with an interchangeable core option for 1-3/4 inch doors, the Accentra 8805FL is a Grade 1 storeroom mortise lock with an Arcadia lever, and the Corbin Russwin ML2003 is a Grade 1 classroom mortise lockset. The 48H is used alongside a latch or exit device, not in place of one.
8) My door is thicker than 1-3/4 inches - which mortise deadbolt or lock handles that?
The BEST 48H is built standard for 1-3/4 inch doors with a thick door configuration available up to 3 inches, specified at time of order, so it covers the widest thickness range among the mortise options here. Note the R function is not offered in the thick door build. If a lockset rather than a deadlock is wanted on a thicker door, the Hager 3810E and 3810S 3800 Series Grade 1 passage mortise locks cover 1-3/4 inch to 2-1/2 inch and use the same 2-3/4 inch backset, and the Baldwin 6301 entry/apartment mortise lock body is rated 1-3/4 inch and over, though on a 2-1/2 inch backset.
9) Do I have to specify handing when I order a BEST 48H mortise deadlock?
No. The 48H case is non-handed and field reversible, and the latch rotates 180 degrees without opening the case. That matters for a property manager buying a few spares: one part number covers left and right hand openings across the building.
10) What is the difference between a mortise deadlock like the BEST 48H and a full mortise lockset?
A deadlock is bolt only. The 48H throws a 1 inch stainless deadbolt with a key on each side, and there is no knob, lever, or latch to operate the door, so the opening still needs a separate handle or pull. A full mortise lockset such as the Cal-Royal NM8080 storeroom or the Corbin Russwin ML2003 classroom puts the latch and the lever in one case. Use the deadlock when you are adding key security to a door that already has its operating hardware, or where you want the bolt independent of the latch.
11) What is an equivalent double cylinder mortise deadbolt if I am not on a BEST keyway?
The Sargent 4874 is a double cylinder mortise deadbolt on the same 2-3/4 inch backset. It is the straight cross-brand equivalent if your building is keyed Sargent rather than BEST. Stay with the 48H when you want the 7-pin SFIC housing that takes your existing BEST interchangeable cores, since that is the piece that keeps the deadlock on the same master key system as the rest of your doors.
12) Is a Marks USA 21AC or 22AC double cylinder mortise lock interchangeable with the BEST 48H?
They are not interchangeable. The Marks USA 21AC and 22AC are entrance double cylinder ornamental iron mortise locks with a round knob, both listed for 1 inch door thickness - they are sized for narrow ornamental iron and storefront-style stiles. The BEST 48H is a commercial heavy duty mortise deadlock for 1-3/4 inch doors with a 2 3/4 inch backset and a 3-3/8 inch x 4-3/16 inch x 1 inch case. The mortise pockets are not the same prep, so one does not retrofit into the other's door.
13) What should I use instead of the BEST 48H if I want keypad or credential control rather than a key?
The 48H is a mechanical, non-electronic lock keyed on both sides. For access control on a mortise prep, the Alarm Lock DL4500 Series is a Grade 1 electronic mortise deadbolt with 2,000 user codes and a privacy keypad for 1-5/8 inch to 1-7/8 inch doors, which is the closest electronic equivalent to a deadbolt function. Dormakaba E-Plex E5086 is a Grade 1 back to back pushbutton and card mortise lock, and the Dormakaba E-Plex 2066 Series is an electronic pushbutton keyless mortise lock. Note the Alarm Lock door thickness range is narrower than the 1-3/4 inch standard the 48H is built for, so verify the leaf.
14) We are standardizing a building on BEST small format cores - which mortise products fit that keying program?
The BEST 48H is the direct fit: its 7-pin housing accepts all BEST interchangeable cores and it ships with SFIC prep less core, so the core is supplied from the facility's own keying program. Among the mortise locksets, the Cal-Royal NM8080 Grade 1 storeroom mortise lockset is offered with an interchangeable core option, which makes it the pairing candidate for latching openings on the same program. Confirm the core format called out on the NM8080 order before combining the two on one keyway.
15) Can the BEST 48H be used on a classroom or privacy opening?
It is not the part for either. The 48H is keyed from both sides with a double cylinder function, which gives no inside release without a key. A classroom opening takes a dedicated classroom function lock such as the Cal-Royal NM8070 Grade 1 classroom mortise lockset for 1-3/4 inch doors, the Corbin Russwin ML2003 Grade 1 mortise classroom lockset, or the Marks USA LA318GJ classroom security indicator mortise lockset with ANSI strike and steel escutcheon. A privacy opening takes the Cal-Royal NM8440 Grade 1 privacy mortise lockset with deadbolt or the Hager 3840S 3800 Series Grade 1 privacy mortise lock on a 2-3/4 inch backset.
16) Does the BEST 48H need to be ordered by hand, or is there a non-handed alternative?
Handing is not a factor on the 48H - it is a non-handed design with a reversible latch that rotates 180 degrees, so handing can be changed in the field without opening the case. Among the other mortise options, the Kaba Ilco 185 Series is also supplied with no handing. By contrast the Baldwin 6310190RRLS is specified right hand reverse and the Schlage LEMD-GRW ENGAGE Series wireless mortise lock is specified right hand, so those have to be ordered to the opening.
17) Can I get the BEST 48H deadlock in matte black or oil rubbed bronze to match the other doors?
Twelve finishes are offered: 605 bright brass, 606 satin brass, 611 bright bronze, 612 satin bronze, 613 satin bronze oil-rubbed, 618 bright nickel, 619 satin nickel, 622 matte black, 625 bright chrome, 626 satin chrome, 626AM satin chrome antimicrobial, and 690 statuary dark bronze. The 626AM is the one to specify for healthcare or food service where an antimicrobial coating is called for on touched hardware. Faceplates are brass or bronze; strikes are brass, bronze, or stainless base material.
18) Is the BEST 48H mortise deadlock heavy enough for a high traffic commercial door?
It is built as heavy duty commercial hardware: 0.095 inch cold rolled steel case, cover, and armored front, zinc dichromate plated against corrosion, with four corner cover screws and an interlocking armored front and cover at the latch. The roller bearing hub cuts wear over cycle life. That is the construction level you want on school, hospital, and multi-tenant corridor doors rather than a residential grade bolt.
19) Does the BEST 48H deadlock need power or wiring run to the door?
No wiring. The 48H is a mechanical deadlock, key operated on both sides, so it keeps working when the power drops. If the job actually calls for access control at that opening, the electrified mortise options are separate products, such as the Command Access ML190 Series motorized mortise lock on 24VDC or the Schlage L9092EU electric lock/unlock mortise with request to exit.
20) Which mortise products are non-keyed if I only need the door to latch, not lock?
The 48H is a keyed product and will not serve a passage opening. For latching without keying, the Schlage PM010 is a Grade 1 non-keyed passage latch mortise lock for 1-3/4 inch doors, the Falcon MA101 is a Grade 1 heavy duty mortise passage lock with field reversible operation and a fire rating, and the Hager 3810S and 3810E 3800 Series Grade 1 passage mortise locks share the 2-3/4 inch backset the 48H uses, in rose and escutcheon trim respectively. The TownSteel MRX-L-01 is a Grade 1 heavy duty anti-ligature lever passage mortise lockset where ligature resistance is required.
21) Is the Emtek 3102 Memphis or 3104 Hamilton mortise entrance set an alternative to the BEST 48H?
They are not. The Emtek 3102 Memphis and 3104 Hamilton mortise entrance locksets, along with the 3019 Brisbane and 3106 Manhattan, are dummy function - they mount trim on an inactive leaf and provide no bolt or latch operation at all. The BEST 48H is a keyed heavy duty mortise deadlock that throws a 1 inch stainless steel bolt. If the requirement is decorative trim on a fixed leaf, the Emtek dummy sets apply; if it is security on an operating door, they do not.
22) We need the deadbolt to release electrically for access control - what replaces the BEST 48H there?
The 48H is mechanical only, with no electrical operation. For an electrically controlled mortise opening, the Command Access ML190 Series is a heavy duty motorized mortise lock with field selectable EL/EU operation on 24VDC in a storeroom function, and the Schlage L9092EU with 03A trim is a heavy duty electric lock/unlock outside lever mortise lock, keyed outside, with request to exit, on 12/24VDC for 1-3/4 inch doors. Both control a latch at the lever rather than a separate deadbolt, so the opening design changes with them.
23) Can I tell at a glance whether the BEST 48H bolt is thrown?
Yes. The 48H carries clear locked and unlocked state indication, with an optional padlock icon display. Useful on rooms where a custodian or officer needs to confirm the bolt is out without keying the door.
How fast can I get the BEST 48H7M626 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 BEST 48H7M626 come with a warranty?
Absolutely. The BEST 48H7M626 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 BEST 48H7M626?
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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