BEST 45H Series Heavy Duty Mor...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,391.00
$862.22
BEST BEST 45H Series (AT - Office Function) - Escutcheon Trim Heavy Duty Mortise Lock, Single Keyed BES-45H-AT-ES

BEST 45H Series Heavy Duty Mortise Lock with Escutcheon Trim - Office Function Single Cylinder

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Model: 45H7AT3J626
$1,391.00
$862.22
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$1,391.00
$862.22
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BEST 45H Series Heavy Duty Mortise Lock with Escutcheon Trim - Office Function Single Cylinder

Professional Grade Mortise Lock Solution

The BEST 45H Series Heavy Duty Mortise Lock delivers commercial-grade security with office function operation and single cylinder keying. Featuring a solid one-piece stainless steel anti-friction latch with 50% more surface contact, this mortise lock provides superior strength and security for demanding applications. Built with 0.095" cold rolled steel construction and 2-3/4" backset, the lock meets ANSI A156.13 Series 1000 Grade 1 Operation and Strength standards with Grade 2 Security rating.

Professional Features & Benefits

  • Enhanced Latch Design: Solid one-piece stainless steel anti-friction latch provides 50% more surface contact with strike for superior strength and security with precision-engineered curve for enhanced cycle life.
  • Heavy-Duty Construction: Case, cover, and armored front manufactured from 0.095" cold rolled steel with zinc dichromate plating for exceptional durability and corrosion protection.
  • Reversible Operation: Non-handed design with reversible latch that rotates 180 degrees for easy handing change without opening case, plus four position hub toggle for flexible configuration.
  • Roller Bearing Mechanism: Roller bearing hub mechanism provides smooth, wear-resistant operation with lever return spring mechanism in trim for enhanced protection against lever droop.
  • Armored Front Protection: Completely surrounds latch and deadbolt providing increased lateral strength with staked assembly design for self-alignment during installation.
  • Enhanced Case Integrity: Four case cover screws at each corner plus interlocking armored front and cover design at the latch for maximum structural integrity.
  • ANSI Compliance: Meets ANSI A156.13 Series 1000 Grade 1 Operation and Strength, Grade 2 Security standards for commercial applications.
  • Cylinder Security: Solid machined cylinder rings with wavy washer provides resistance to wrenching with security screw preventing removal without core removal.

Technical Specifications

45H Series –The design and operation of the BEST® mortise lock meets the intent
of the standard for ANSI A117.1 section 404.2.6.
Builders Hardware Manufacturers Association:
45H Series –ANSI A156.13, Series 1000, Grade 1 Operation and Strength, Grade 2 Security. To meet Grade 1 Security, a drill resistant core
(1CD, 1CDP, 1CDF, or 1CDX) must be used with escutcheon trims, and 1EK7K4 high security cylinder must be used with sectional trims.
47H Series – ANSI A156.13, Series 1000, Grade 1 Operational, Strength, and Security

Auxiliary bolt – Stainless steel, non-handed.
Backset – 2-3/4"
Case –0.095” cold rolled steel, 5- 7/8" H x 7/8" D x 4-1/16" W. Steel is zinc dichromate plated for corrosion protection.
Deadbolt – Stainless steel, 1" throw.
Latchbolt –Solid stainless steel, 3/4" throw. Latch is oil-impregnated for anti-friction operation. Reversible without opening case.
Strike – For complete strike package spec’s see page 5.
Door Thickness – Standard lock configuration designed for doors 1-3/4" thick. Thick door configuration available for doors up to
5" thick (specify thickness when ordering).
Faceplate –Stainless steel, brass or bronze material, 8" H x 1-1/4" W x 1/16" T. Lock face automatically adjusts to proper bevel during
installation.
Products protected by one or more of the following patents: 4,873,853 5,590,555 5,794,472
Finishes –
• 605 - bright brass, clear coated
• 606 – satin brass, clear coated
• 611 – bright bronze, clear coated
• 612 – satin bronze, clear coated
• 613* – oxidized satin bronze, oil rubbed
• 618 – bright nickel plated, clear coated (brass base material)
• 619 – satin nickel plated, clear coated (brass base material)
• 622 – flat black coated (brass base material) 625 – brightchromium plated (brass base material)
• 626 – satin chromium plated (brass base material)
• 629 – bright stainless steel
• 630 – satin stainless steel
• 690* – dark bronze coated (brass base material)
*613 finish is designed to wear over time, providing an “antique” appearance.
*690 finish will continue as a dark brown appearance over time.
Antimicrobial Finish –
• 626AM – satin chrome plated with UltraShield™ antimicrobial protected coating
• 630AM – satin stainless steel with UltraShield™ antimicrobial protected coating
The BEST UltraShield finish inhibits the growth of bacteria and other microbes on the surface of the hardware.
NOTE: BEST UltraShieldTM option is recommended for use on any hardware application where product cleanliness is a high priority. i.e;.
Hospital/Healthcare, Elderly Care, Education, Transportation, Food-Service, Hospitality.

Installation & Operation

  1. Review manufacturer specifications and verify door preparation requirements including door thickness (standard 1-3/4" or up to 5" thick door configuration), mortise pocket dimensions, and handing requirements.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and frame surfaces for proper backset alignment.
  3. Prepare door mortise pocket and frame strike preparation according to specifications, ensuring proper clearances for latch and deadbolt operation.
  4. Install lock case in mortise pocket and secure with provided screws, utilizing the self-aligning trim mechanism for accurate positioning.
  5. Install escutcheon trim and adjust operational components including the four position hub toggle for desired locking configuration and lever return mechanism.
  6. Test lock operation including latch and deadbolt function, key operation, and lever return to verify proper alignment and smooth operation throughout full range of motion. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

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

Why Choose BEST Quality?

BEST 45H Series mortise locks deliver professional-grade reliability with heavy-duty 0.095" cold rolled steel construction and precision-engineered components designed for demanding commercial applications. The solid stainless steel latch and roller bearing mechanism provide enhanced durability and smooth operation, while ANSI Grade 1 compliance ensures dependable performance where security and reliability are essential.

Product Specs

Series:
45H
Standard Cylinder:
SFIC Prep Less Core
Duty Level:
Heavy Duty
Keyed Function:
Single 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
Face Plate:
8" H x 1-1/4" W x 1/16" T
Product Category:
Mechanical Locks
Backset (Distance):
2-3/4"
Department:
Door Hardware

BEST 45H7AT3J626 – Frequently Asked Questions

1) Will the BEST 45H office function mortise lock fit a door thicker than 1-3/4 inches?
The standard BEST 45H lock configuration is built for 1-3/4 inch doors. For anything thicker, up to 5 inches, BEST builds a thick-door configuration, and you have to state the actual door thickness when you place the order. There is no field adjustment for it, so measure the leaf before ordering rather than after.
2) Do I need to know the handing before ordering a BEST 45H mortise lock?
You pick a hand at order time (left hand, right hand, left hand reverse, or right hand reverse), but the lock body itself is non-handed. The latch reverses by rotating 180 degrees without opening the case, and there is a four position hub toggle inside, so a lock that shows up on the wrong hand is a field fix rather than a return.
3) What does office function mean on the BEST 45H, and how is it different from storeroom?
Office function on the 45H means the outside lever can be left locked or unlocked, and the inside lever always retracts the latch for free egress. It is the right pick for a tenant office or admin suite where staff want to secure the door during the day and leave it open during business hours. A storeroom function is always locked outside with key-only entry, which is what you want on a mechanical or supply room instead. If you need that behavior from another brand, the Cal-Royal NM8080 and the Accentra 8805FL are Grade 1 mortise storeroom locksets.
4) Does the BEST 45H come with a cylinder core?
No core is included. The 45H is prepped for a BEST small format interchangeable core and ships less core, so you supply the SFIC to match your existing keying system. That is the usual setup for a facility already running BEST cores, since you can key it into the master system without ordering keying from the factory.
5) Is the BEST 45H mortise lock ANSI Grade 1?
The 45H meets ANSI A156.13, Series 1000, Grade 1 for Operation and Strength, with a Grade 2 Security rating. To reach Grade 1 Security with escutcheon trim you have to use a drill resistant core (1CD, 1CDP, 1CDF or 1CDX). If your spec calls for Grade 1 across operation, strength and security with a standard core, the 47H series is the one that carries all three.
6) What do I have to specify when ordering a BEST 45H office mortise lock?
Four things beyond the function: handing (left, right, left hand reverse, right hand reverse), finish, lever style, and escutcheon trim style. Trim comes as J wrought escutcheon, M forged escutcheon, or N forged escutcheon with concealed cylinder. Lever choices run from the 3 and 12 solid tube levers to curved with or without return, contour with angle return, gull wing, or the 4 round knob. Add door thickness to the order if the leaf is over 1-3/4 inches.
7) What is a comparable Grade 1 office function mortise lock to the BEST 45H AT if I need a keyed office lock from another manufacturer?
The Cal-Royal NM8050 is the closest straight equivalent. It is a heavy duty Grade 1 mortise lockset with an entrance/office function and an auxiliary deadlatch, prepped for doors 1-3/4 inches thick. The BEST 45H AT is also a heavy duty commercial mortise lock with office function and a 2-3/4 inch backset, keyed single cylinder. The main difference to weigh is keying: the 45H AT ships with an SFIC prep less core, so it drops into a small format interchangeable core system, while the NM8050 is a conventional office/entrance lockset.
8) The opening needs to stay locked at all times from the outside - is the BEST 45H AT the right function or should I pick something else?
Office function unlocks and relocks from the inside by toggle, so it is not the choice for an opening that must remain locked outside at all times. For that, use a storeroom function mortise lock such as the Accentra 8805FL, a Grade 1 storeroom mortise lock in the 8800 Series with an Arcadia lever, or the Cal-Royal NM8080, a heavy duty Grade 1 storeroom mortise lockset with an interchangeable core option for 1-3/4 inch doors. The NM8080's interchangeable core option is the closer match if you are already keying the BEST 45H AT into an SFIC system.
9) Will a Baldwin 6301 mortise lock body drop into the same door prep as the BEST 45H AT?
No. The Baldwin 6301 entry/apartment mortise lock body is a 2-1/2 inch backset, and the 6310 entry/storeroom body is likewise 2-1/2 inch. The BEST 45H AT is a 2-3/4 inch backset, so the cylinder and hub centers land in a different place and the door would need re-prepping. If the door is already bored for the BEST, stay on a 2-3/4 inch backset lock.
10) The opening needs to be released by the access control system - can the BEST 45H AT be used or do I need a different lock?
The BEST 45H AT is a mechanical, non-electronic mortise lock, so it cannot be released electrically. For an electrified opening, the Command Access ML190 is a heavy duty motorized mortise lock with field selectable fail safe or fail secure operation on 24VDC in 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.
11) Is there an antimicrobial option on the BEST 45H for a hospital or clinic?
Two finishes carry the BEST UltraShield antimicrobial coating: 626AM satin chrome and 630AM satin stainless steel. The coating inhibits growth of bacteria and other microbes on the hardware surface, and BEST points it at hospital and elderly care, education, transportation, food service and hospitality work. Standard 626 and 630 are the same appearance without the coating.
12) Is the BEST 45H an electronic or access control lock?
No, the 45H is a purely mechanical key-operated mortise lock with no electrified or credential option on it. If the opening needs a keypad or card credential, the electronic mortise locks we carry include the Schlage CO-100 standalone keypad mortise lock, the Alarm Lock Trilogy DL3500CR Grade 1, and the TownSteel FME-2000 Grade 1 with RFID. For an electrified version of a conventional mortise lock, the Command Access ML190 gives field selectable fail safe or fail secure on 24VDC.
13) What else could I use if I want an office function mortise lock but not the BEST 45H?
Two close alternatives we carry: the Cal-Royal NM8050 is a heavy duty Grade 1 office/entrance mortise lockset with auxiliary deadlatch for 1-3/4 inch doors, and the Hager 3850E is a Grade 1 office mortise lock with lever and escutcheon on a 2-3/4 inch backset, non-keyed, covering 1-3/4 to 2-1/2 inch doors. The Hager is the one to look at if the leaf is thicker than 1-3/4 inches and no key is needed; the Cal-Royal if you want a keyed office lock on a standard door.
14) Does the BEST 45H office lock meet accessibility requirements for lever operation?
BEST states that the design and operation of the 45H mortise lock meets the intent of ANSI A117.1 section 404.2.6, which covers door hardware operation. Lever styles available include curved with or without return, contour with angle return and gull wing; note that the 4 option is a round knob rather than a lever, which is not the choice for an accessible opening.
15) Is there an electronic mortise lock I can use in place of the BEST 45H AT if we want to move off keys?
Yes, several. The Schlage CO-100 is a Grade 1 heavy duty standalone electronic mortise lock with a keypad reader for 1-3/4 inch doors. The Alarm Lock DL3500CR is a Grade 1 Trilogy electronic mortise lock holding 300 user codes. The Accentra NTM623-NR nexTouch Generation 3 mortise lock uses a capacitive touchscreen keypad and has cylinder override without a deadbolt. The BEST 45H AT is a non-electronic mechanical mortise lock keyed single cylinder, so switching to any of these changes credential management as well as the trim.
16) We are specifying a behavioral health unit - can the BEST 45H AT escutcheon trim be used, or is there an anti-ligature alternative?
For ligature resistant openings, use a purpose built trim rather than a standard escutcheon lever. The TownSteel MRX-L-01 is a Grade 1 heavy duty stainless steel anti-ligature lever mortise lockset in passage function for 1-3/4 inch doors, and the MRX-A-01 is the same passage function with satin stainless ligature resistant arch trim. The Marks USA 5PDN is a Grade 1 hospital passage mortise push/pull paddleset that is ligature resistant and ADA compliant in satin stainless steel. Note all three are passage function, while the BEST 45H AT is a keyed office function lock.
17) Is the Schlage PM010 a substitute for the BEST 45H AT?
Not functionally. The Schlage PM010 is a Grade 1 non-keyed passage latch mortise lock for 1-3/4 inch doors - it latches only and never locks. The BEST 45H AT is a keyed single cylinder office function lock. Use the PM010 where the opening only needs a latch, and stay with the 45H AT where the room has to be secured. The Falcon MA101 is another Grade 1 heavy duty fire rated mortise passage lock with field reversible operation if you need a passage lock on that same run of doors.
18) For a bathroom or bedroom door, is there a privacy mortise lock to order instead of the BEST 45H AT?
Yes. The Cal-Royal NM8440 is a heavy duty Grade 1 privacy mortise lockset with deadbolt for 1-3/4 inch doors, and the Hager 3840S is a 3800 Series Grade 1 privacy mortise lock with a 2-3/4 inch backset for doors 1-3/4 to 2 inches thick - that backset matches the BEST 45H AT if the door is already prepped. The 45H AT itself is an office function lock with keyed single cylinder operation.
19) Can I use a Sargent 4874 deadbolt in place of the BEST 45H AT?
Only if the opening needs a deadbolt alone. The Sargent 4874 is a double cylinder mortise deadbolt in the 4870 Series with a 2-3/4 inch backset - it shares the backset with the BEST 45H AT but has no latchbolt and no lever trim, so there is no latching or free egress. The 45H AT is a single cylinder office function lockset with escutcheon lever trim. Similarly, the Kaba Ilco 185 Series is a non-handed deadbolt mortise lock, not a lockset.
20) What is the difference between the BEST 45H AT and the Sargent 7925 for a dormitory corridor door?
The Sargent 7925 is a Grade 1 heavy duty 7900 Series dormitory exit function mortise lock with rose trim and a single cylinder deadbolt. The BEST 45H AT is a heavy duty office function lock with escutcheon trim, available in wrought escutcheon, forged escutcheon, and forged escutcheon with concealed cylinder. So the decisions are function - dormitory exit with a deadbolt versus office - and trim style, rose versus escutcheon.
21) Our doors are 2 inches thick - will the BEST 45H AT work, or do I need a different mortise lock?
The BEST 45H AT standard configuration is built for 1-3/4 inch doors, with a thick door configuration available up to 5 inches when the thickness is specified at time of order, so it covers 2 inch doors. Among comparable Grade 1 mortise locks, the Hager 3810E passage lock with escutcheon lists 1-3/4 to 2-1/2 inches, while the Cal-Royal NM8050 office/entrance lockset and the Corbin Russwin ML2003 are listed at 1-3/4 inches.
22) Which BEST 45H finish should I use to match the rest of my building?
Fourteen finishes are offered, so matching an existing fleet is usually doable: 605 bright brass, 606 satin brass, 611 bright bronze, 612 satin bronze, 613 oil rubbed satin bronze, 618 bright nickel, 619 satin nickel, 622 matte black, 625 bright chrome, 626 satin chrome, 629 and 630 stainless, 690 statuary dark bronze, plus the 626AM and 630AM antimicrobial versions. Two behave differently over time: 613 is meant to wear to an antique look, and 690 stays a dark brown. For a commercial corridor where every opening has to look alike in five years, 626 or 630 are the stable picks.
23) How durable is the BEST 45H case for a high traffic corridor?
Case, cover and armored front are 0.095 inch cold rolled steel with zinc dichromate plating for corrosion resistance, with four case cover screws at the corners and an interlocking armored front and cover at the latch. The latch is one piece solid stainless steel, oil impregnated, with about 50 percent more surface contact with the strike than a conventional latch, and the hub runs on roller bearings with a lever return spring in the trim to fight lever droop. It is classed heavy duty and commercial.
24) We need matching dummy trim on the inactive leaf of a pair where the BEST 45H AT is on the active leaf - what do I order?
The BEST 45H AT is an operating keyed office function lockset, not a dummy. For the inactive leaf, the Schlage L0170 is a Grade 1 heavy duty half dummy mortise non-keyed lever trim for 1-3/4 inch doors. Emtek also offers mortise entrance dummy locksets in the Brisbane 3019, Memphis 3102, Hamilton 3104, and Manhattan 3106 designs if the pair is on a decorative opening rather than a commercial one.
How fast can I get the BEST 45H7AT3J626 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 45H7AT3J626 come with a warranty?
Absolutely. The BEST 45H7AT3J626 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 45H7AT3J626?
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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