BEST 8KL Series Grade 1 Cylind...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$127.15
BEST 8KL Series Grade 1 Cylindrical Deadlocking Latch Component

BEST 8KL Series Grade 1 Cylindrical Deadlocking Latch Component

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Model: 8KL3DL626
$127.15
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$127.15
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BEST 8KL Series Grade 1 Cylindrical Deadlocking Latch Component

Professional Cylindrical Lock Component for Heavy-Duty Applications

The BEST 8KL Series Cylindrical Lock Part features a deadlocking latch designed for Grade 1 heavy-duty cylindrical knob locks. This component is constructed of steel or brass to ensure overall strength and durability, unlike other cylindrical knob sets made from weaker metals. The 8K Series incorporates long bearing length in chassis for smooth, wear-resistant operation and offers specialized options including lead line configurations for radioactive door applications.

Professional Features & Benefits

  • Grade 1 Heavy-Duty Construction: Steel or brass construction ensures superior strength and durability compared to weaker metal alternatives in commercial applications.
  • Enhanced Security Design: No keeper hole on keyed knobs provides added security against unauthorized access attempts.
  • Smooth Operation Engineering: Long bearing length in chassis delivers smooth, wear-resistant operation for extended service life.
  • Accessibility Compliance: Tactile or knurled knob options available for blind, safety, and accessibility applications meeting ADA requirements.
  • Break-Away Protection: Optional breakaway feature prevents the lock from being overpowered by a wrench, protecting against vandalism and forced entry.
  • Specialized Applications: Lead line options available for radioactive door environments including MRI and x-ray facilities.
  • Anti-Microbial Option: Agion antimicrobial finish available for healthier door hardware in healthcare and high-touch environments.
  • 7-Pin Cylinder Housing: Standard cylinder accepts all BEST cores except SFIC core for flexible keying options.

Technical Specifications

  • No keeper hole on keyed knobs for added security
  • Tactile or knurled knob for blind, safety and accessibility applications
  • Breakaway feature option to prevent the lock from being overpowered by a wrench
  • Long bearing length in chassis for smooth, wear resistant operation
  • Lead line options for radioactive doors (MRI, x-ray, etc.)

Installation & Operation

This deadlocking latch component is designed for use with compatible BEST 8K Series cylindrical lock assemblies. Refer to the parent device installation instructions and manufacturer documentation for proper integration. Ensure compatibility with existing hardware before installation.

Professional Applications

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

Break-Away Protection Design

The optional breakaway feature prevents the lock from being overpowered by a wrench, providing vandal-resistance and protection against forced entry attempts. This design maintains security integrity while allowing for reset capability when needed.

Anti-Microbial Option

Agion antimicrobial finish is available for healthier door hardware applications, particularly beneficial in healthcare environments and high-touch commercial settings where hygiene is a priority.

Why Choose BEST Quality?

BEST 8K Series cylindrical lock components deliver professional-grade reliability with steel or brass construction rated for Grade 1 heavy-duty performance. The long bearing length chassis design ensures smooth, wear-resistant operation for demanding commercial applications. Engineered for demanding commercial applications where dependable performance and security are essential.

Product Specs

Series:
8K Series
Grade:
Grade 1
Duty Level:
Heavy Duty
Keyed Function:
Single Cylinder
Standard Cylinder:
7-pin housing, accepts all BEST cores (less SFIC core)
Product Group:
Mechanical Locks
Product Subgroup:
Bored Locksets
Product Type:
Knobsets
Subcategory:
Bored Locksets
Keyed:
Yes
Electronic:
No
Commercial/Residential:
Commercial
Handle Type:
Knob
Product Attribute:
Cylindrical Locks
Product Function:
Entrance
Door Hand Direction:
Non-Handed
Product Category:
Mechanical Locks
Department:
Door Hardware

BEST 8KL3DL626 – Frequently Asked Questions

1) Will the BEST 8KL deadlocking latch work in my existing 8K Series knob lock chassis?
The 8KL latch is built as a component for BEST 8K Series Grade 1 cylindrical knob locks, so it goes into an 8K chassis, not into another manufacturer's bored lock. Match three things when you order: backset (2-3/4, 3-3/4 or 5 inch), latch style (DL deadlocking or SL springlatch) and finish. Get the backset right first, since that is the one dimension the door prep already fixed for you.
2) What is the difference between the DL deadlock latch and the SL springlock latch on a BEST 8K knob lock?
Both are offered on the 8K latch. The DL deadlocking latch carries a deadlatch plunger alongside the main bolt, so once the door closes against the strike the plunger blocks the latch from being pushed back with a card or shim. The SL springlatch has no plunger, it just springs into the strike. For any keyed exterior or corridor opening take the DL. SL is for openings where nothing is being secured against loiding, or where an existing door has no lip strike to hold the plunger.
3) I have a 5 inch backset door prep. Can I still use a BEST 8K cylindrical latch?
Yes. The 8K latch is stocked in 2-3/4 inch, 3-3/4 inch and 5 inch backsets. The 5 inch backset is what you need on wide stile aluminum and on doors bored off centre for a push plate or pull, and it is not a common option across bored locksets, so specify it rather than assuming the standard latch will reach.
4) Is the BEST 8K knob lock rated Grade 1 for a high traffic commercial door?
Grade 1, heavy duty, and specified for commercial use. The chassis uses a long bearing length for wear resistance and the parts are steel or brass rather than pot metal, which is what separates a Grade 1 bored lock from the Grade 2 and Grade 3 knobsets sold for lighter duty. For a school corridor, a hospital wing or a multi-tenant entry, Grade 1 is the level most specs call out.
5) Will a BEST 8K knob lock take my existing BEST cores, and can I use a small format interchangeable core?
The standard cylinder is a 7-pin housing that accepts all BEST cores except the SFIC core. If your facility is keyed on BEST figure-eight small format cores, that is the one thing this standard housing will not take, so confirm which core family your master key system runs on before you order. Everything else in the BEST core line drops in, which is what lets you fold the opening into an existing master key system instead of carrying a second key.
6) What is the closest Grade 1 keyed cylindrical knob lock to the BEST 8K Series if the BEST keyway is not required?
The Corbin Russwin CK4851 is a Grade 1 entrance/office cylindrical knob lock with a Global knob and a conventional cylinder, covering doors 1-3/8 inch to 2 inch thick. Like the BEST 8K Series, it is a keyed cylindrical knob lock in an entrance function with a single cylinder. The difference that matters for keying is the cylinder: the BEST 8K standard cylinder is a 7-pin housing that accepts all BEST cores except the SFIC core, while the CK4851 uses a conventional cylinder, so it will not accept BEST cores and joins a facility key system through Corbin Russwin keying instead.
7) The opening needs a Grade 1 heavy duty knob lock that stays locked from outside at all times. What should be used instead of an entrance function?
The Sargent 8XG04 is a Grade 1 heavy duty storeroom/closet knob lock with a single cylinder and a 2-3/4 inch backset. Storeroom keeps the outside knob locked at all times and the key retracts the latch, where the BEST 8K Series covered here is an entrance function with a single cylinder, which allows the outside knob to be left unlocked. For a supply room or mechanical room where the door must never be left free, the storeroom function is the one to specify; both are Grade 1 heavy duty.
8) Is a Grade 2 keyed knob lock enough for an office door, or does it have to be Grade 1?
The Dexter C2000 Series entry/office knob lock is a Grade 2 keyed cylindrical ball knob lock, non-clutching, for doors 1-3/8 inch to 1-3/4 inch, and the Callan Edgewood is a Grade 2 entrance knobset. Both carry the same entrance/office function as the BEST 8K Series but at Grade 2, and both are limited to a 1-3/4 inch maximum door in the Dexter case. The 8K Series is Grade 1 heavy duty and its latch comes in 2-3/4 inch, 3-3/4 inch and 5 inch backsets, so where a drawing calls Grade 1 or the opening uses a deep backset, the Grade 2 units will not answer the spec.
9) Which knob products look like a cylindrical knob lock but will not latch or lock a door on their own?
Several knob items are trim only. The Sargent 28C-KNOB is exit device trim with a knob and rose for 1-3/4 inch doors, the Sargent 78-2875 is an outside knob only with B design, and the Imperial USA ED-BKL580 is knob trim in a storeroom function. All three mount to a separate device rather than operating a latch by themselves. Dummy knobs are the other group that does not latch: the Schlage A170 is a Grade 2 single dummy trim and the Bravura Biloxi is a Grade 2 dummy knobset. The BEST 8K Series is a keyed Grade 1 cylindrical knob lock whose latch comes as a deadlock latch or a springlock latch, so it operates the door itself.
10) Does the BEST 8K latch have to be ordered for a left hand or right hand door?
No handing to specify. The 8K cylindrical latch is non-handed, so one part covers left and right hand openings. On install just make sure the latch bevel faces the stop before you drive the screws.
11) What finishes does the BEST 8K cylindrical latch come in, and will it match the knobs already on my building's doors?
Eight finishes: 605 bright brass, 606 satin brass, 611 bright bronze, 612 satin bronze, 613 satin bronze oil-rubbed, 625 bright chrome, 626 satin chrome and 690 statuary dark bronze. Those are BHMA finish numbers, so if the existing hardware in the building is specified as 626 or 630 on the schedule, order to the number rather than to the name. The visible part of a latch is the faceplate, so matching the number is what keeps the edge of the door consistent across a floor.
12) What Grade 1 cylindrical knob lock can I use instead of BEST 8K if I am not on a BEST key system?
Two Grade 1 heavy duty cylindrical knob options from other brands: the Falcon X101 with interchangeable core, listed for 1-3/8 to 2-1/4 inch doors, and the Schlage D Series D10S, both heavy duty Grade 1. Corbin Russwin's CK4851 is a keyed cylindrical knob lock listed as Grade 1 with a 1-3/8 to 2 inch door thickness range and a conventional cylinder. The Falcon and Corbin options matter most if you want an interchangeable core system without committing to BEST cores.
13) Is a Grade 2 or Grade 3 knob lock good enough, or do I need the BEST 8K?
Depends on the door. A Grade 3 knobset like the Cal-Royal BER00 entrance lock or the Pamex FTF Baron is built for light residential-level duty, and a Grade 2 such as the Dexter C2000 entry knob or Sargent 6G04 storeroom lock covers moderate commercial traffic. The BEST 8K is Grade 1 heavy duty and is what a spec calls for on a corridor, a stairwell or a tenant entry that cycles all day. On a closet or a private office inside a suite, the lighter grades are the sensible spend.
14) I need a knob lock for an MRI or x-ray room. Does BEST 8K have a lead lined option?
Yes, the 8K Series offers lead line options for radioactive door applications including MRI and x-ray rooms. That is a specify-at-order option, not a stock configuration you swap in later, so it belongs on the hardware schedule with the backset and finish. There is also an Agion antimicrobial finish option for healthcare and other high-touch openings, and tactile or knurled knobs for hazard identification on doors serving blind or accessibility applications.
15) How do I stop people snapping the knob off with a pipe wrench on a BEST 8K lock?
Order the breakaway option. On the 8K it lets the knob give way under a wrench or pipe attack instead of transmitting that force into the chassis and defeating the lock, and it resets afterward. Worth specifying on exposed exterior doors, alley doors and anywhere you have had vandalism. Keyed knobs on the 8K also come with no keeper hole, which removes one more attack point.
16) For a light-traffic interior or residential-grade door, what keyed knob lock is a simpler alternative to a Grade 1 commercial knob?
The Cal-Royal BER00 is a Grade 3 entrance/office knob lock with a Kwikset keyway for doors 1-3/8 inch to 1-3/4 inch, the Pamex FTF Baron is a Grade 3 entrance/office knob lockset for the same door thickness range, and the Kwikset 400P-CP is a Grade 3 keyed entry knob with a round corner adjustable latch and round corner strike. These are keyed entrance knobs at Grade 3 for lighter openings. The BEST 8K Series is a Grade 1 heavy duty commercial knob lock, and its cylinder is a 7-pin housing that accepts BEST cores, so it is the one that ties into a BEST keyed facility system.
17) What knob lock should be used on a bathroom or bedroom door that needs to lock from the inside without a key?
The Dexter C2000 Series privacy knob lock is a Grade 2 non-keyed privacy cylindrical ball knob for doors 1-3/8 inch to 1-3/4 inch, the Cal-Royal BER20 is a Grade 3 privacy knob lock with brass trim, and the Pamex FTF Baron privacy is a Grade 3 privacy knob lockset. Privacy locks turn from the inside and have no outside cylinder. The BEST 8K Series is keyed with a single cylinder in an entrance function, which is the wrong function for a bath or bedroom door.
18) Is there a knob lock that works without a key for staff who carry no keys?
The Lockey 3830 is a mechanical keyless combination knob lock with an auto-locking passage function for doors 1 3/16 inch to 2 inch thick. It is opened by a code rather than a cylinder, so no key is issued. The BEST 8K Series takes a 7-pin cylinder housing that accepts all BEST cores except the SFIC core, which is what puts an opening on a master key system. The choice is between code access on the single door and keyed access that ties into the rest of the building.
19) Is the BEST 8K knob lock keyed on one side or both?
Single cylinder, keyed one side. It is an entrance function bored knob lock, so you key the outside and operate free from the inside. If your opening needs a key on the interior side as well, a bored single cylinder knob lock is the wrong tool and you should be looking at a double cylinder or a mortise lock instead.
20) Does the BEST 8K knob lock need power or wiring run to the door?
No power. The 8K is a fully mechanical cylindrical lock, so there is no transfer hinge, no power supply and no low voltage run to budget. If you need access control on the opening, this is not the platform, and you would be specifying an electrified lock or a keypad unit such as the Lockey 3830 mechanical keyless combination knob lock for a no-wiring alternative.
21) Which Grade 1 non-keyed knob lock fits a thicker door for a closet or hall opening?
The Corbin Russwin CK4310 is a Grade 1 non-keyed passage/closet cylindrical lock with a Global knob rated for doors 1-3/8 inch to 2 inch, and the Falcon X101 is a Grade 1 heavy duty passage knobset for doors 1-3/8 inch to 2-1/4 inch. The Corbin Russwin CK4410 covers the same passage/closet function at Grade 2 and 1-3/8 inch to 1-3/4 inch. For a closet or hall door alongside BEST 8K Series entrance openings, the CK4310 and X101 hold Grade 1 without adding a cylinder.
How fast can I get the BEST 8KL3DL626 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 8KL3DL626 come with a warranty?
Absolutely. The BEST 8KL3DL626 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 8KL3DL626?
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 8KL3DL626 from ZenSupply?
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