BEST 8T Series One-Way Single-...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$323.00
$199.44
BEST BEST 8T Series One-Way Single-Keyed Function (L) No Turnknob Tubular Deadbolt BEST-8T-L

BEST 8T Series One-Way Single-Keyed Tubular Deadbolt with 1" Stainless Steel Throw

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Model: 8T27LSTK626
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$323.00
$199.44
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BEST 8T Series One-Way Single-Keyed Tubular Deadbolt with 1" Stainless Steel Throw

Premium Security Tubular Deadbolt for Commercial Applications

The BEST 8T Series tubular deadbolt delivers enhanced security with a full 1" stainless steel throw bolt and wrench-resistant design features. Built for commercial office spaces, residential applications, and areas requiring greater security protection, this single-keyed deadbolt incorporates premium materials and attack-resistant construction. The 8T features a solid extruded brass or bronze cylinder with tapered cylinder rings and optional hidden mounting screws for maximum security performance.

Professional Features & Benefits

  • Full 1" Stainless Steel Throw: Solid stainless steel deadbolt provides enhanced durability and superior protection against forced entry attempts.
  • Attack-Resistant Design: Free-turning, wrench-resistant, tapered cylinder ring and optional hidden mounting screws enhance security against tampering.
  • Premium Construction: Solid extruded brass or bronze cylinder with wrought brass or bronze trim delivers commercial-grade durability and corrosion resistance.
  • Simple Installation: Self-aligning and reversible strike design allows for straightforward installation without compromising security performance.
  • BEST Interchangeable Core Compatible: May be keyed into existing BEST masterkeyed systems with the original interchangeable core for instant, economical rekeying.
  • Fire Door Rated: UL listed for use as auxiliary lock type on 3-hour fire doors (GWXT) with C-UL mark for Canadian compliance.
  • Flexible Door Compatibility: Standard 1-3/4" door thickness with other thicknesses available for various applications.
  • 3-Year Manufacturer Warranty: Comprehensive warranty coverage provides added confidence and protection for commercial installations.

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 door thickness, backset dimensions (2-3/8" for 8T2 or 2-3/4" for 8T3), and bore requirements.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and frame surfaces for proper deadbolt and strike alignment.
  3. Prepare door by drilling required 2-1/8" bore and routing faceplate mortise as specified in manufacturer instructions.
  4. Install deadbolt assembly and secure to door per manufacturer torque specifications, ensuring proper cylinder and thumbturn alignment.
  5. Install strike plate in frame mortise and adjust for proper deadbolt engagement and smooth operation throughout full throw range.
  6. Test deadbolt operation from both sides to verify proper function, key operation, and thumbturn engagement. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Retail Establishments
  • Multi-Tenant Residential Properties
  • Government and Municipal Buildings
  • Fire-Rated Door Applications

Why Choose BEST Quality?

BEST T Series tubular deadbolts incorporate top quality design, engineering, and premium materials including solid stainless steel construction and brass or bronze components for enhanced durability. UL listed for 3-hour fire door applications with comprehensive 3-year warranty coverage. Engineered for demanding commercial applications where dependable security performance and attack resistance 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:
Single Cylinder
Commercial/Residential:
Commercial
Lock Type:
Tubular
Lock Function:
Deadbolt
Product Attribute:
Deadbolts
Product Function:
Cylinder x Thumbturn
Door Hand Direction:
Non-Handed
Door Thickness Range:
1-3/4"
Product Category:
Mechanical Locks
Department:
Door Hardware

BEST 8T27LSTK626 – Frequently Asked Questions

1) Will the BEST 8T deadbolt fit a 2-3/8 inch backset door prep, or do I need 2-3/4?
Both. The 8T tubular deadbolt is offered in a 2-3/8 inch backset (the 8T2) and a 2-3/4 inch backset (the 8T3), and every finish is available in either backset. Measure from the door edge to the center of the 2-1/8 inch bore before you order, because the two are not interchangeable in an existing prep. If you are drilling fresh, 2-3/8 is the common residential-scale backset and 2-3/4 the usual commercial one.
2) Does the BEST 8T deadbolt drop into an existing 2-1/8 inch bore?
Yes. The 8T is prepped for a standard 2-1/8 inch cross bore, and the rose trim is 2-3/4 inches in diameter specifically to cover that bore. If you are pulling an old tubular deadbolt off a door that already has the 2-1/8 hole, the hole is right; what you need to confirm is the backset (2-3/8 or 2-3/4) and that the door is 1-3/4 inches thick, which is the standard the 8T ships for.
3) Can I put a BEST 8T deadbolt on a 3-hour fire-rated door?
Yes. The 8T is UL listed as an auxiliary lock type on 3-hour fire doors, under the GWXT category, and carries the C-UL mark for Canadian jobs. That is the pairing an institutional buyer usually needs on stair and corridor openings where an auxiliary bolt is going onto a rated leaf.
4) Will a BEST 8T deadbolt key into our existing BEST masterkey system?
It will. The 8T accepts the BEST interchangeable core, so if your building is already on a BEST masterkeyed system you can pull the original core from the lock you are replacing and drop it straight in. That is the whole reason facilities standardize on this line: rekeying a door becomes a core swap with a control key instead of a locksmith visit. It is single cylinder, key outside and thumbturn inside.
5) Will the 1 inch throw on a BEST 8T reach my existing strike and frame?
The 8T throws a full 1 inch, bolt face 5/8 by 7/8 inches. A 1 inch throw is what gets you past a normal frame gap and deep into the jamb, and it is the reason this reads as a security deadbolt rather than a builder-grade one. Four strike options are covered: ANSI rectangular 1-1/8 x 2-3/4, ANSI curved lip 1-1/8 x 2-3/4, ANSI curved lip 1-1/4 x 4-7/8, and an ANSI high security rectangular 1-1/4 x 4-7/8. Match the strike to what is already routed into your frame and you avoid re-mortising the jamb.
6) My door is 1-3/8 inches thick. Is there a commercial deadbolt that fits instead of the BEST 8T?
The 8T is set up for 1-3/4 inch doors, which is the standard commercial leaf. On a thinner 1-3/8 inch door, look at the Dexter DB1000 single cylinder, a Grade 1 deadbolt listed for 1-3/8 to 1-7/8 inch doors, or the Accentra D111, Grade 1 with a 2-3/8 inch backset and a 1-3/8 to 1-3/4 inch range. Both are cylinder by thumbturn, same function as the 8T.
7) We are not on a BEST keyway. What is a comparable commercial deadbolt with a conventional cylinder?
The 8T's value is the BEST interchangeable core, so on a building keyed to something else that advantage disappears. Hager's 3215 is a Grade 2 single cylinder deadbolt with a 1 inch throw and a Schlage C keyway, fits 1-3/8 to 1-3/4 inch doors, and is fire rated. If you want the heavier option, Cal-Royal's CRB800 is a Grade 1 heavy duty single cylinder deadbolt with a UL 3-hour fire rated latch. Both are cylinder by thumbturn like the 8T.
8) Which deadbolt takes a small format interchangeable core the way the BEST 8T does?
The Deltana CL200LAIC is a Grade 2 single cylinder deadbolt built for an interchangeable core and supplied without the cylinder, on a 2-3/4 inch backset. The Arrow E61 is a Grade 2 single cylinder deadlock with SFIC prep supplied less core, for doors 1-3/8 to 1-3/4 inch. The Delaney LM Series is a Grade 1 single cylinder less-core deadbolt with cylinder x thumbturn function in dull chrome. All three let a facility drop its own core in, which is the same reason the 8T is specified where a BEST masterkey system is already running.
9) What is the closest Grade 1 alternative to the BEST 8T tubular deadbolt if a BEST keyway is not required?
The Accentra D111 is a Grade 1 single cylinder deadbolt with cylinder x thumbturn function and a 2-3/8 inch backset, matching the 8T's cylinder x thumbturn function and its 2-3/8 inch backset offering. The Falcon D111 is another Grade 1 cylinder x thumbturn deadbolt, rated heavy duty, in the D100 Series. Both cover the same opening as the 8T when the job does not depend on keying into a BEST interchangeable core system.
10) What should I use instead of the BEST 8T when the door is not 1-3/4 inch thick?
The 8T is built around 1-3/4 inch doors. For a thinner leaf, the Dexter DB1000 single cylinder deadbolt is Grade 1 and covers 1-3/8 to 1-7/8 inch, and the Hager 3215 single cylinder deadbolt with a 1 inch throw is Grade 2 and covers 1-3/8 to 1-3/4 inch. For a thicker door, the Corbin Russwin DL3011 is a Grade 1 cylindrical deadlock covering 1-3/4 to 2-1/4 inch, and the Deltana 7312KA2 is a Grade 3 double cylinder deadbolt covering 1-3/8 to 2 inch.
11) I need a keyed deadbolt on both sides, not a thumbturn. What replaces the BEST 8T?
The 8T is a single cylinder deadbolt operating cylinder outside, thumbturn inside. For key-both-sides, the Design Hardware D1 Series is a Grade 1 double cylinder deadbolt rated extra heavy duty for 1-3/4 inch doors, the same thickness the 8T is built for. The Dexter DB1000 double cylinder is also Grade 1, covering 1-3/8 to 1-7/8 inch, and the Hager 3214 is a Grade 2 double cylinder deadbolt with a Schlage C keyway. Note that key-both-sides is restricted by egress code in many occupancies, so confirm before specifying.
12) Is a mortise deadbolt a substitute for the BEST 8T tubular deadbolt?
No. The 8T is a tubular deadbolt that installs in a 2-1/8 inch bore with a faceplate mortise. The Dormakaba D900 small case mortise deadbolt is cylinder x thumbturn like the 8T but seats in a mortise pocket, and the Emtek 2050 and 2051 are European mortise deadbolts with an integrated roller latch. Those require a mortised door edge, so they are not a drop-in for a bored opening.
13) The BEST 8T-L has no turnknob inside. What do I use if I need thumbturn-only egress with no key at all?
The Arrow E60 is a Grade 2 exit deadlock, non-keyed, with blank plate outside and thumbturn inside, for doors 1-3/8 to 1-3/4 inch. That is the reverse of the 8T-L one-way single-keyed arrangement and the right choice on a door that must throw and retract from the secure side only. If instead you need a key outside and a blank plate inside, the Corbin Russwin DL3211 is a Grade 1 cylindrical deadlock, cylinder x blank, for 1-3/4 inch doors.
14) Does the BEST 8T deadbolt have to be handed when I order it?
No handing to specify. The 8T is non-handed and the strike is self-aligning and reversible, so one part number covers left and right hand openings. For a property manager buying a dozen for a building, that means you order by backset and finish only.
15) What finishes does the BEST 8T tubular deadbolt come in?
Ten, in both backsets: 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. For a healthcare or senior living corridor, the 626AM antimicrobial satin chrome is the one to specify so the deadbolt matches the rest of the touch hardware on that spec.
16) Can you get out of the room without a key on a BEST 8T deadbolt?
Yes, from the inside. The 8T is single cylinder: key on the outside, thumbturn on the inside, so egress does not need a key. If your code official requires no thumbturn at all on an interior side, that is a different function and a double cylinder deadbolt such as the Design Hardware D1 Series (Grade 1, 1-3/4 inch doors) or the Callan 210S is what you would be looking at instead. Check the egress requirement for the occupancy before you take the turn off a door.
17) How well does the BEST 8T deadbolt hold up to someone attacking the cylinder with a wrench?
That is what the trim is built around. The cylinder ring is free-turning, wrench-resistant and tapered, so a pipe wrench slips instead of biting, and hidden mounting screws are available so the trim cannot be unbolted from the outside. Cylinder is solid extruded brass or bronze with wrought brass or bronze trim. On the 8T3 the bolt itself is solid stainless steel; the 8T2 uses a brass nickel plated bolt with a concealed hardened steel free-turning pin to resist sawing.
18) What is the difference between the BEST 8T and a residential-style adjustable-backset deadbolt?
The 8T is a commercial deadbolt ordered with a fixed backset, either 2-3/8 inch for the 8T2 or 2-3/4 inch for the 8T3, with brass or bronze trim and a 1 inch throw. The Brinks Raleigh and Brinks Mendocino single cylinder deadbolts use a 4-way adjustable backset, so one unit fits either bore centerline. The adjustable design suits scattered-site doors with unknown prep; the fixed 8T backset suits a spec that already calls the centerline.
19) What is a lighter-duty alternative to the BEST 8T for interior or low-traffic doors?
The Arrow DBX61 is a Grade 2 single cylinder deadbolt with cylinder x thumbturn function, the same function as the 8T. The Cal-Royal CB160 is a Grade 2 single cylinder deadbolt with a tamper-resistant cylinder guard. Below that, the Cal-Royal ED500 is a Grade 3 single cylinder deadbolt with an adjustable backset for 1-3/8 to 1-3/4 inch doors, which suits an opening where the backset prep is not yet fixed.
20) Can I swap the BEST 8T for an electronic deadbolt on the same door?
A code or credential deadbolt changes the prep, not just the hardware. The Codelocks CL2200 is a medium duty electronic surface deadbolt in brushed steel and the CL2210 is an electronic mortise deadbolt, both surface or mortise rather than bored like the 8T. The Delaney KP400 is a Grade 2 electronic deadbolt with a programmable remote, and the Dormakaba Saffire LX-D is an RFID electronic deadbolt with BLE and electronic lock override. None of them accept a BEST interchangeable core, so a facility keyed on BEST loses that common key when it switches.
21) Will the Arrow 460 strike work as a replacement strike for the BEST 8T?
No. The Arrow 460 is a mortise lock strike for latchbolt and deadbolt functions with a straight lip, sized for a mortise lock case. The 8T uses ANSI strikes in four patterns: rectangular 1-1/8 by 2-3/4 inch, curved lip 1-1/4 by 4-7/8 inch, curved lip 1-1/8 by 2-3/4 inch, and high security rectangular 1-1/4 by 4-7/8 inch, with a self-aligning reversible design. Order the strike against those ANSI dimensions rather than a mortise strike.
22) I need an ADA-friendly thumbturn on a deadbolt. Is there an option other than the BEST 8T?
The Cal-Royal LSD is a Grade 3 single cylinder deadbolt with an ADA ergonomic thumbturn, cylinder x thumbturn function, for doors 1-3/8 to 1-3/4 inch. It is the right pick where the inside turn has to be operable without tight grasping or twisting. The 8T-L is the one-way single-keyed version with no turnknob, so on an accessible door the turn side has to come from a thumbturn-equipped lock.
23) For a classroom door, is the BEST 8T the right deadbolt or should I look at a classroom function?
The 8T is a single cylinder deadbolt, cylinder outside and thumbturn inside on the standard function. Where the spec calls a classroom deadbolt, the Falcon D111 is Grade 1 heavy duty with an adjustable backset, the Falcon D211 is the Grade 2 medium duty version, and the Hager 3118 is a Grade 1 classroom deadbolt with a Schlage C keyway and 6-pin cylinder. Match the function called on the door schedule rather than substituting on grade alone.
24) The door has no bore for a deadbolt yet. Is there an alternative to the BEST 8T that avoids drilling through?
The 8T requires a 2-1/8 inch through bore. The Callan 205S is a Grade 3 one-sided half-bore deadbolt, which does not carry through to the outside face. The Codelocks CL200 is a surface deadbolt with key override, mounting to the door face rather than into a bore. Either avoids full through-bore prep where the 8T would need it.
25) What is a decorative alternative to the BEST 8T for a door where appearance matters?
The 8T uses a 2-3/4 inch diameter rose in finishes such as 605 bright brass, 613 satin bronze oil-rubbed, and 690 statuary dark bronze. For a more architectural look, the Emtek #11 Tuscany is a lost wax cast bronze deadbolt with cylinder x thumbturn function, and the Baldwin Reserve contemporary round and square deadbolts are double cylinder units. Confirm the fire and grade requirements of the opening before trading down from the 8T's commercial construction.
How fast can I get the BEST 8T27LSTK626 delivered?
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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 8T27LSTK626 come with a warranty?
Absolutely. The BEST 8T27LSTK626 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 8T27LSTK626?
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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