BEST Peaks 1CK 140 Series Inte...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$87.00
$84.34
BEST Peaks 1CK 140 Series Interchangeable Cylinder Core

BEST Peaks 1CK 140 Series Interchangeable Cylinder Core

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Model: BES-1CK6B116263840
From the Peaks Cores Collection
$87.00
$84.34
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$87.00
$84.34
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BEST Peaks 1CK 140 Series Interchangeable Cylinder Core

Patented Key Control Solution for Multi-Manufacturer Hardware

The BEST Peaks 1CK 140 Series Cylinder Core delivers advanced key control and security through a patented keying system designed for facilities utilizing multiple lock manufacturers. This interchangeable core enables single-key operation across all locks at your facility regardless of manufacturer, providing unified access control with enhanced security. The patented mechanism ensures cylinders and cores operate exclusively with Peaks keys, available only through authorized BEST distributors.

Professional Features & Benefits

  • Multi-Manufacturer Compatibility: 140 Series design allows integration with other manufacturers' hardware for unified facility key control.
  • Patented Key Control: Exclusive patented mechanism ensures cores operate only with authorized Peaks keys for enhanced security.
  • Authorized Distribution Network: Peaks keys available exclusively through authorized BEST distributors for controlled key management.
  • System Upgradability: Compatible with BEST CORMAX or BEST Preferred components for future system expansion.
  • Single Key Operation: Enables operation of all facility locks using one key regardless of lock manufacturer.
  • Interchangeable Core Design: Standard interchangeable core format for easy installation and maintenance.
  • Commercial-Grade Construction: Engineered for demanding commercial applications requiring reliable access control.

Technical Specifications

  • Collection: Peaks Cores
  • Commercial/Residential: Commercial
  • Department: Door Hardware
  • Parts and Accessories Type: Replacement Parts
  • Product Attribute: Parts and Accessories
  • Product Category: Mechanical Locks
  • Product Group: Parts and Accessories
  • Product Subgroup: Cylinders
  • Product Type: Cylinders
  • Series: 1CK Series
  • Subcategory: Parts and Accessories

Installation & Operation

This cylinder core is designed for use with compatible interchangeable core hardware systems. 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
  • Multi-Tenant Properties
  • Industrial and Manufacturing Facilities
  • Government and Municipal Buildings
  • Retail Establishments

Why Choose BEST Quality?

BEST Peaks cylinder cores deliver professional-grade security with patented key control technology engineered for demanding commercial applications. The 140 Series provides the flexibility to integrate multiple lock manufacturers into a single keying system while maintaining the highest security standards. Backed by BEST's commitment to quality and available exclusively through authorized distributors for controlled key management.

Manufacturer Resources

BEST PEAKS

Product Specs

Product Group:
Parts and Accessories
Series:
1CK Series
Product Subgroup:
Cylinders
Product Type:
Cylinders
Subcategory:
Parts and Accessories
Commercial/Residential:
Commercial
Collection:
Peaks Cores
Parts and Accessories Type:
Replacement Parts
Product Attribute:
Parts and Accessories
Product Category:
Mechanical Locks
Department:
Door Hardware

BEST BES-1CK6B116263840 – Frequently Asked Questions

1) Will a BEST Peaks 1CK core work in Sargent, Yale, Corbin Russwin or Schlage locks?
That is what the 140 Series is for. The 1CK Peaks core is ordered with a style that matches the host hardware, and the styles cover Arrow, LSDA and Schlage "06" kits, Corbin Russwin CK4200 Grade 1 knob and UT5200 unit lock, Corbin Russwin CL3900 and Yale 5400LN Grade L lever, Falcon, Sargent and Weiser small diameter plug kits, Sargent 7, 8 and 9 line knob, Sargent 7600 Integra lock, the Sargent kit for 6, 10, 65 line and 2000 exit devices, Yale 5300 Grade 2 and 5400 Grade 1 knob, plus the Peaks universal "99" cylinder kit and the plain BEST I/C 6-pin brass core. That lets one Peaks key run locks from several manufacturers in the same building.
2) What do I have to specify when ordering a BEST Peaks 1CK core?
Five choices decide the part: core size (6-pin or 7-pin), finish (606 satin brass or 626 satin chrome), keyway (B1, B2, B3, B6, B7 or B10), the style that matches the lock it drops into, and whether you want it combinated or uncombinated. If you order combinated, you also give the keymark and marking number so it cuts into your existing Peaks system. Uncombinated cores ship unpinned for a locksmith to key on site.
3) Can I buy Peaks keys anywhere, or only from BEST?
Peaks is a patented restricted system. The cores operate only with Peaks keys, and those keys come only through authorized BEST distributors. That is the point of the product: nobody duplicates a key for your building at a hardware store. Plan your key ordering through the same channel as the cores.
4) Is the BEST 1CK a small format interchangeable core or a full size one?
The 1CK Peaks core is a BEST-format interchangeable core, the standard figure-eight I/C shape, and it pulls with a control key rather than requiring the lock to come apart. It is not the same thing as a full size interchangeable core cylinder like the Schlage 20-057 FSIC, which uses a housing that accepts an FSIC core. If your hardware is prepped for FSIC, the 1CK is not the part.
5) I have a Sargent knob lock and a Sargent exit device to rekey. Do I need the BEST Peaks core or is there a simpler Sargent-specific cylinder?
The Peaks 1CK covers both: its style options include a Sargent 7, 8 and 9 Line knob kit, a Sargent kit for the 6, 10, 65 Line and 2000 exit device line, and a Sargent 7600 Integra Lock kit, all running the patented Peaks keyways. If you do not need Peaks key control, the Kaba Ilco 1579 Series is a knob and lever cylinder made for Sargent. The difference is the keying program - the Peaks route brings those Sargent devices onto one patented system across the building, while the 1579 is a straightforward replacement cylinder for the Sargent hardware alone.
6) What should I use instead of a BEST Peaks 1CK core on a Corbin Russwin mortise lock?
The Peaks 1CK offers Corbin Russwin styles for the CK4200 Grade 1 knob and UT5200 unit lock, and for the CL3900 and Yale 5400LN Grade L lever. Those are key-in-lock kits, not mortise cylinder housings. For a Corbin Russwin mortise prep, the 1000 Grade 1 Series mortise cylinder comes 1-1/2 inch long with an A02 straight cam, and the 1070 Grade 1 Series is a 1-1/4 inch 6-pin mortise housing with an A01 cloverleaf cam. If the mortise lock is actually a Schlage L9000, the Corbin Russwin 1080 is a 1-1/2 inch 6-pin LFIC mortise cylinder with an A01 Schlage L cam.
7) What is the closest interchangeable core alternative to a BEST Peaks 1CK core if the facility is standardized on Schlage keying?
The Schlage 20-057-C is a full size interchangeable core cylinder in the C keyway with a 643E Aged Bronze finish, and the Schlage 20-057 is a 6-pin FSIC rim cylinder with a convertible tailpiece cam supplied with two keys. Both keep the removable-core service model, but they are Schlage FSIC format on Schlage keying. The BEST Peaks 1CK 140 Series core runs the patented Peaks keying system in B1, B2, B3, B6, B7 and B10 keyways, in 6-pin and 7-pin sizes, and its 140 Series styles are built to drop into other manufacturers' hardware so one key covers the facility. Choose the Schlage cores if you are extending an existing Schlage FSIC system; choose the Peaks 1CK if you want a single patented key across mixed-manufacturer locks.
8) My facility uses Falcon and Arrow locks alongside Schlage. Does one core cover all of them, or do I buy brand-specific cylinders?
The Peaks 1CK 140 Series is built for exactly that case: style options include a Falcon, Sargent and Weiser cylinder kit for small diameter plug, an Arrow, LSDA and Schlage 06 kit, and a Peaks Universal 99 cylinder kit, all on the same patented Peaks keyways so one key runs the mixed hardware. The brand-specific alternative is a separate cylinder per line - for example the Falcon A23161-05 G key in lever cylinder, a 6-pin G keyway unit keyed different with two cut keys. That route works but leaves you with separate keys per manufacturer.
9) Should I order 6-pin or 7-pin Peaks cores?
Match whatever your existing Peaks or BEST system is keyed to. A 6-pin core and a 7-pin core are not interchangeable within one masterkey system, so if the building is already running 7-pin, every added core needs to be 7-pin. Starting fresh, 7-pin gives more room for master key levels across a large facility; 6-pin is the common choice for smaller systems. Both sizes are offered here.
10) Which keyway should I pick for a new BEST Peaks system?
Six Peaks keyways are offered: B1, B2, B3, B6, B7 and B10. If you are adding to a building that already has Peaks cores, order the same keyway as the marked cores you are replacing, otherwise the existing keys will not enter. On a new system the keyway choice is about keeping your facility separate from neighbouring buildings served by the same distributor, so let your BEST distributor assign it against their records.
11) Can I upgrade later from Peaks to another BEST platform?
Peaks 1CK cores work alongside BEST CORMAX or BEST Preferred components, so a system started on Peaks can be expanded or migrated without replacing the hardware the cores sit in.
12) What is the difference between a combinated and an uncombinated Peaks core?
Combinated means BEST pins the core to your system before it ships, which is why the keymark and marking number fields are there on the order. Uncombinated ships blank for a locksmith with Peaks pinning capability to key on site. Property managers standardising a building usually order combinated so cores arrive ready to swap in; locksmiths keeping stock usually order uncombinated.
13) Can I rekey a building without pulling the locks apart?
That is the reason facilities run interchangeable cores. With the 1CK Peaks core, a control key pulls the core out and a new one drops in, so a tenant turnover or a lost-key event is a core swap at the door rather than a lock teardown. Keeping a few combinated spares on the shelf turns a rekey into a few minutes per opening.
14) Will a BEST Peaks 1CK core work in an exit device rim application, or do I need a rim cylinder?
A rim device needs a rim cylinder housing. The Peaks 1CK is an interchangeable core, and its Sargent kit for the 6, 10, 65 Line and 2000 exit device line is what adapts it to that hardware. For a straight rim cylinder, the Schlage 20-021 is a 6-pin rim cylinder with a vertical tailpiece cam and the 20-022 is the same cylinder with a horizontal tailpiece cam, both with two keys. The Corbin Russwin 3070 is a 6-pin rim cylinder housing with a 1-7/8 inch tailpiece. Match the tailpiece orientation and length to the device before ordering.
15) Is a Kaba Ilco universal cylinder a substitute for a BEST Peaks 1CK core?
They solve different problems. The Kaba Ilco 1539 Series is a key-in-knob and lever universal cylinder and the 1599 is a key-in-knob replacement cylinder - fixed cylinders you pin and install. The BEST Peaks 1CK is a removable interchangeable core on the patented Peaks keying system, offered in 6-pin and 7-pin, combinated or uncombinated, and its 140 Series styles adapt it to other manufacturers' hardware. If you want cores you can pull and swap with a control key across a facility, the Ilco universal cylinders will not do that.
16) I need to rekey an aluminum storefront deadlock - can I use the BEST Peaks 1CK?
Storefront deadlocks take a mortise cylinder or a cylinder pull, not an interchangeable core in a knob or lever kit. The Adams Rite 4036 is a five-pin mortise cylinder rated Grade 1 with a 1/2 inch minimum door thickness. For cylinder pull applications on the Adams Rite MS1847 deadlock, the 4024 is a cylinder pull with trim plate mounting and the 4025 is a five pin tumbler cylinder pull with through-screws; on a 5017 wood door deadlock, use the 4026. The Peaks 1CK is the right choice for the interior knob, lever and exit hardware you want on the same patented key system.
17) For residential-style deadbolts and handlesets, is the BEST Peaks 1CK the right cylinder?
The Peaks 1CK 140 Series is a commercial interchangeable core with kits for commercial knob, lever, unit lock and exit device lines. For deadbolt and handleset work, Medeco offers purpose-built retrofits: the 1012040 is a 6-pin lazy motion rim cylinder for Kwikset single cylinder deadbolts, the 1075127 is a 5-pin rim type lazy motion single cylinder for handlesets and deadbolts, the 1065244 is a 5-pin lazy motion rim cylinder with an Emtek tailpiece, and the 1065140 is a 5-pin retrofit for the Arrow JL interconnected lock and Emtek handleset and deadbolt outside cylinder. Emtek also lists the CY4 cylinder sold each.
18) What is a plain 6-pin mortise cylinder option if I do not need patented key control?
The Detex MC65 is a 1-1/8 inch 6-pin commercial grade mortise cylinder in the Schlage C keyway, which puts it on a standard open keyway rather than a restricted one. The BEST Peaks 1CK runs the patented Peaks system, where cores operate only with Peaks keys obtained through authorized BEST distributors. Pick based on whether you want open key duplication or controlled key issue, and note the MC65 is a fixed mortise cylinder while the 1CK is a removable core available in 606 Satin Brass and 626 Satin Chrome.
19) What finishes does the BEST Peaks 1CK core come in, and will it match my lock trim?
Two finishes: 606 satin brass and 626 satin chrome. 626 is the usual match for satin chrome and brushed stainless commercial lever trim, 606 for satin brass. Only the core face shows once installed, so a close match to the lock rose is normally enough.
20) Is the Peaks 1CK core meant for commercial buildings or houses?
Commercial. These cores are built for office buildings, schools, hospitals, multi-tenant property, industrial plants, government buildings and retail, where key control across many doors and many lock brands is the problem being solved. For a single residential deadbolt a standard replacement cylinder such as the Kaba Ilco 1549 key-in-deadbolt cylinder is the simpler route.
How fast can I get the BEST BES-1CK6B116263840 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 BES-1CK6B116263840 come with a warranty?
Absolutely. The BEST BES-1CK6B116263840 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 BES-1CK6B116263840?
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