BEST 8T Series Double Cylinder...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$423.00
$252.07
BEST BEST 8T Series Double Cylinder Function (M) Tubular Deadbolt BEST-8T-M

BEST 8T Series Double Cylinder Tubular Deadbolt with 1" Stainless Steel Throw

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Model: 8T37MSTK626
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$423.00
$252.07
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BEST 8T Series Double Cylinder Tubular Deadbolt with 1" Stainless Steel Throw

Premium Security Deadbolt for Commercial and Residential Applications

The BEST 8T Series Double Cylinder Tubular Deadbolt delivers enhanced security with a full 1" stainless steel throw bolt and attack-resistant design features. Built for standard door preparations with 1-3/4" door thickness, this deadbolt features solid extruded brass or bronze cylinder construction and free-turning, wrench-resistant tapered cylinder rings. UL listed for use as auxiliary lock on 3-hour fire doors, the 8T Series provides reliable security for commercial office spaces, residential applications, and healthcare facilities requiring enhanced protection.

Professional Features & Benefits

  • Full 1" Stainless Steel Throw: Solid stainless steel deadbolt provides maximum security and corrosion resistance for long-term durability.
  • Attack-Resistant Design: Free-turning, wrench-resistant tapered cylinder rings and optional hidden mounting screws enhance security against forced entry attempts.
  • Premium Construction: Solid extruded brass or bronze cylinder with wrought brass or bronze trim ensures professional-grade durability and performance.
  • Fire Door Compatibility: UL listed for use as auxiliary lock on 3-hour fire doors with C-UL mark for Canadian compliance standards.
  • Interchangeable Core System: Compatible with existing BEST masterkeyed systems and permits instant, economical rekeying with original interchangeable core technology.
  • Simple Installation: Self-aligning and reversible strike design simplifies installation while maintaining security performance.
  • ADA Compliance: Includes ADA turn lever for accessibility compliance in commercial applications.
  • Manufacturer Warranty: 3 Year warranty coverage for added confidence and protection.

Technical Specifications

  • Faceplate: Brass or bronze; 8T2 - 1” x 2 1/4”; 8T3 - 1 1/8” x 2 1/4”
  • Strikes: ANSI rectangular 1 1/8” x 2 3/4”; ANSI curved lip 1 1/4” x 4 7/8”;
    ANSI curved lip 1 1/8” x 2 3/4”; ANSI high security rectangular 1 1/4” x 4 7/8”
  • Trim: Wrought brass or bronze; rose or turned lever rose; 2 3/4” diameter
    to cover 2 1/8” bore; machined brass or bronze cylinder ring
  • Backset: 2 3/8” for 8T2; 2 3/4” for 8T3
  • Deadbolt: 8T2 - 1” throw, 5/8” x 7/8”, brass nickel plated, concealed hardened
    steel free-turning pin; 8T3 – 1” throw, 5/8” x 7/8”, solid stainless steel
  • Door thickness: 1 3/4” doors standard, other thicknesses available 

DOWNLOAD & RESOURCES

Installation & Operation

  1. Review manufacturer specifications and verify door preparation requirements including 1-3/4" door thickness and standard bore dimensions for tubular deadbolt installation.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door surfaces for proper alignment.
  3. Prepare door by drilling required holes per manufacturer specifications, ensuring proper backset dimensions (2-3/8" for 8T2 or 2-3/4" for 8T3 models).
  4. Install deadbolt assembly and secure mounting hardware per manufacturer torque specifications, utilizing hidden mounting screws where applicable.
  5. Install self-aligning and reversible strike plate in door frame, ensuring proper alignment with deadbolt throw.
  6. Test deadbolt operation to verify smooth extension and retraction of the 1" stainless steel throw bolt 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 (including MRI and X-ray rooms)
  • Retail Establishments
  • Multi-Tenant Residential Properties
  • Government and Municipal Buildings
  • Industrial and Warehouse Facilities

Why Choose BEST Quality?

BEST 8T Series tubular deadbolts incorporate top quality design, engineering, and premium materials including solid stainless steel construction and extruded brass or bronze components. UL listed for 3-hour fire door applications with 3 Year warranty coverage, these deadbolts deliver the professional-grade reliability and security performance expected from BEST. Engineered for demanding commercial applications where dependable protection and long-term durability are essential.

Product Specs

Series:
T Series
Warranty:
3 Year
Keyed:
Yes
Product Group:
Mechanical Locks
Product Subgroup:
Bored Locksets
Product Type:
Deadbolts
Subcategory:
Bored Locksets
Keyed Function:
Double Cylinder
Commercial/Residential:
Commercial
Lock Type:
Tubular
Lock Function:
Deadbolt
Product Attribute:
Deadbolts
Product Function:
Double Cylinder
Door Hand Direction:
Non-Handed
Door Thickness Range:
1-3/4"
Product Category:
Mechanical Locks
Department:
Door Hardware

BEST 8T37MSTK626 – Frequently Asked Questions

1) Will the BEST 8T double cylinder deadbolt work on a door with a 2-3/8 inch backset, or do I need 2-3/4?
Both backsets are covered, but they are different models. The 8T2 is the 2-3/8 inch backset version and the 8T3 is 2-3/4 inch. Measure from the door edge to the center of the 2-1/8 inch bore and order to match, because the backset is fixed per model, not adjustable. Every finish offered runs in both backsets, so the choice doesn't limit your finish.
2) Is a double cylinder deadbolt the right choice, or should I use a cylinder-by-thumbturn instead?
A double cylinder deadbolt takes a key on both sides, so nobody can reach through broken glass and turn it from the inside. The tradeoff is egress: with no thumbturn, anyone inside needs a key to get out, which many jurisdictions prohibit on required exit doors in occupied space. If the opening needs free egress, a cylinder x thumbturn is the version to order. Comparable single cylinder options ZenSupply carries include the Accentra D111, a Grade 1 with a 2-3/8 inch backset, and the Hager 3215 with a 1 inch throw.
3) Can I put the BEST 8T deadbolt on a 1-3/8 inch door?
No. The 8T is built for 1-3/4 inch doors as standard, which is the usual commercial thickness. For a 1-3/8 inch door, look at deadbolts with a range that covers it, such as the Dexter DB2000 double cylinder (1-3/8 inch to 1-3/4 inch) or the Deltana 7312KA2 double cylinder (1-3/8 inch to 2 inch).
4) Will the BEST 8T deadbolt key into the masterkey system we already run in the building?
If your building is already on BEST interchangeable cores, yes. The 8T takes BEST original interchangeable core and works with existing BEST masterkeyed systems, so a locksmith swaps the core with a control key instead of pulling the lock apart to rekey. That is the main reason to spec the 8T over a generic commercial deadbolt on a facility that is already standardized on BEST.
5) Can I use this deadbolt as an extra lock on a fire rated door?
Yes, as an auxiliary lock. The 8T is UL listed for use as an auxiliary lock on 3-hour fire doors and carries the C-UL mark for Canada. Auxiliary means it supplements the fire door's latching lock, it does not replace it, so the opening still needs its self-latching lockset or exit device.
6) Will the BEST 8T bolt reach into the strike prep already cut in my frame?
The bolt throws a full 1 inch and measures 5/8 by 7/8 inches at the face, which is standard deadbolt bolt geometry, so it will engage a normal ANSI strike pocket. The strikes supplied cover the common preps: ANSI rectangular 1-1/8 by 2-3/4 inches, ANSI curved lip 1-1/4 by 4-7/8 inches, ANSI curved lip 1-1/8 by 2-3/4 inches, and a high security rectangular 1-1/4 by 4-7/8 inches. Pick the one matching what is already routed in the frame and you avoid re-mortising. The strike is self-aligning and reversible, so it goes in either hand.
7) Will the trim cover the old bore if I'm replacing a deadbolt that's already in the door?
The rose is 2-3/4 inches in diameter and covers a 2-1/8 inch bore, which is the standard deadbolt cross bore, so on a door already prepped for a tubular deadbolt the trim covers the existing hole. Faceplate at the door edge is 1 inch by 2-1/4 inches on the 8T2 and 1-1/8 inches by 2-1/4 inches on the 8T3. The catch is the backset: the existing bore has to sit at 2-3/8 or 2-3/4 inches to line up with the model you order.
8) Do I have to specify handing when ordering the BEST 8T deadbolt?
No handing to specify. The 8T is non-handed and the strike is reversible, so one part number works on a left or right hand door. That matters when you are buying a batch for a building and don't want to survey every opening first.
9) What's the difference between the 8T2 and the 8T3 besides backset?
Two things. Backset is 2-3/8 inches on the 8T2 and 2-3/4 inches on the 8T3. Bolt material differs too: the 8T2 bolt is brass, nickel plated, with a concealed hardened steel free-turning pin, while the 8T3 bolt is solid stainless steel. Both throw a full 1 inch and both measure 5/8 by 7/8 inches. Faceplates differ slightly, 1 by 2-1/4 inches versus 1-1/8 by 2-1/4 inches.
10) What finishes does the BEST 8T deadbolt come in for matching the rest of a building's hardware?
Ten finishes, and each one is available in both the 2-3/8 and 2-3/4 inch backset: 605 bright brass, 606 satin brass, 611 bright bronze, 612 satin bronze, 613 satin bronze oil-rubbed, 619 satin nickel, 625 bright chrome, 626 satin chrome, 626AM satin chrome antimicrobial, and 690 statuary dark bronze. 626 satin chrome is the usual commercial match. The 626AM antimicrobial option is the one to look at for patient rooms and other healthcare touch points.
11) What else could I use instead of the BEST 8T if I don't run BEST cores?
The 8T's advantage is the BEST interchangeable core, so on a facility not standardized on BEST that value disappears. Other double cylinder deadbolts ZenSupply carries: the Design Hardware D1 Series, Grade 1 extra heavy duty for 1-3/4 inch doors; the Dexter DB1000, Grade 1 for 1-3/8 to 1-7/8 inch; the Delaney LU Series, Grade 2 in stainless US32D; and the Callan 210S, Grade 3. If you want interchangeable core from another brand, the Deltana CL200LAIC is an IC-prep deadbolt, though it is a single cylinder.
12) I need a deadbolt for a classroom door that locks from inside with a key. Is the 8T the right one?
Not quite. The 8T is a straight double cylinder deadbolt, keyed on both sides, with no classroom-specific function. For classroom deadbolt function, look at the Falcon D111, Grade 1 heavy duty with adjustable backset, the Falcon D211 in Grade 2, or the Hager 3118, a Grade 1 classroom deadbolt with a Schlage C keyway and 6-pin cylinder for doors 1-3/8 to 1-3/4 inches.
13) Is a tubular deadbolt like the BEST 8T strong enough for a commercial exterior door, or should I be looking at a mortise deadlock?
The 8T is a tubular bored deadbolt rated commercial, with a 1 inch throw and solid stainless bolt on the 8T3, which is what carries the security on an exterior wood or hollow metal door prepped with a 2-1/8 inch cross bore. Where you would move to a mortise deadlock instead is on a door already mortise-prepped, or where you need a hook bolt for a sliding or narrow application. ZenSupply carries the Dormakaba D900 small case mortise deadbolt and the International Door Closers DH-1821 hook bolt deadlock for those cases.
14) Does the BEST 8T deadbolt meet ADA for a commercial opening?
An ADA turn lever is included. Note what that means on a double cylinder: the turn lever is the ADA-compliant operator for the version that has one, and the double cylinder configuration is keyed on both faces. If the opening requires an operable-without-a-key inside, spec the turn side rather than a second cylinder.
15) How does the BEST 8T resist someone attacking the cylinder with a wrench?
The cylinder rings are free-turning and tapered, so a wrench or pliers spins on them instead of gripping and shearing the cylinder. Hidden mounting screws are available as an option, which removes the exposed fasteners from the inside face. Cylinder body is solid extruded brass or bronze with wrought brass or bronze trim.
How fast can I get the BEST 8T37MSTK626 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 8T37MSTK626 come with a warranty?
Absolutely. The BEST 8T37MSTK626 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 8T37MSTK626?
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 BEST 8T37MSTK626 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.
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