BEST 1C Series Standard 5-Pin ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$66.00
$60.09
BEST 1C Series Standard 5-Pin Cylinder Core

BEST 1C Series Standard 5-Pin Cylinder Core

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Model: BES-1C5A1605
From the Standard Cores Collection
$66.00
$60.09
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$66.00
$60.09
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BEST 1C Series Standard 5-Pin Cylinder Core

Professional Standard Core Solution for Commercial Applications

The BEST 1C Series Standard 5-Pin Cylinder Core delivers proven security and durability for commercial door hardware applications. Engineered to the same strict tolerances and high manufacturing standards as BEST patented systems, this standard core provides reliable performance and precise masterkey compatibility. Part of the comprehensive BEST Standard key system family, the 1C core offers the quality and dependability that has made BEST an industry leader for nearly 100 years.

Professional Features & Benefits

  • Precision Manufacturing: Engineered to the same strict tolerances and high standards as BEST patented systems for consistent quality and performance.
  • Proven Durability: BEST Standard key systems deliver long-lasting performance across a wide range of commercial applications with trusted reliability.
  • Masterkey Compatibility: Designed for precise, carefully managed masterkey applications that provide flexible access control solutions.
  • Standard Core Design: 1C Series standard configuration offers reliable security performance for general commercial door hardware applications.
  • 5-Pin Configuration: Standard 5-pin tumbler design provides appropriate security level for most commercial access control requirements.
  • Comprehensive System Support: Part of the actively supported BEST Standard system family with continued availability and technical support.
  • Quality Construction: Manufactured to BEST’s high standards of excellence ensuring dependable operation and long service life.

Technical Specifications

  • Collection: Standard 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: Standard & Premium Cores
  • Subcategory: Parts and Accessories

Installation & Operation

This cylinder core is designed for use with compatible BEST lock cylinders and door hardware. 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

Available Core Options

The BEST Standard system offers multiple core configurations including 1C Standard, 1CD Drill Resistant, 1CDP Drill Resistant Premium, 1CP Premium, and specialized cores for specific applications. The 1C Series provides the foundation standard core option for general commercial security requirements with proven reliability and masterkey system compatibility.

Why Choose BEST Quality?

BEST Standard key systems have provided security, durability and performance for nearly 100 years across a wide range of commercial applications. Manufactured to the same strict tolerances and high standards of excellence as BEST patented systems, these cores deliver the quality, durability and performance you can trust. With active support for new and existing BEST Standard systems, you can rely on continued availability and technical expertise for your access control needs.

Manufacturer Resources

Premium Cores and Keys

Product Specs

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

BEST BES-1C5A1605 – Frequently Asked Questions

1) What do I need to specify when ordering a BEST 1C 5-pin core?
Four things decide the part: keyway, finish, whether you want it combinated or uncombinated, and, if combinated, the keymark and marking number from your key system records. Keyways run A, B, C, D, DD, E, F, G, H, J, K, L, M, N, O, R, TB, TC, TD and TE. Finishes are 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. Get the keyway wrong and the key will not enter, so pull it off an existing core or your keying schedule before you order.
2) What is the difference between ordering a combinated and an uncombinated BEST 1C core?
Combinated means the core arrives pinned to a key combination, and you supply the keymark and marking number from your system so it drops into your existing masterkey hierarchy. Uncombinated ships unpinned for a locksmith or in-house shop to key on site. If you run your own keying bench, take uncombinated; if you just need a working core on a door, order combinated with the keymark.
3) Will a BEST 1C core work in my existing BEST masterkey system?
Yes, the 1C standard core is built for BEST Standard key systems and is made for carefully managed masterkey applications. It has to be ordered in the same keyway as the rest of your system, and combinated to your keymark, to operate under your existing master. It is a standard (non-patented) core, so it will not join a patented BEST system.
4) Can I swap a BEST 1C core without taking the lock apart?
That is the point of the interchangeable core format. With the control key the core pulls out of the housing and a new one drops in, so rekeying a floor or a whole building is a core swap, not a lock teardown. You do need the control key for that system; without it the core stays in.
5) Will a BEST 1C core fit a Schlage full size interchangeable core opening?
No. The 1C is a BEST-format core and goes into BEST-prepped housings and locks. For a Schlage FSIC housing you need a Schlage-format core such as the Schlage 20-057-C full size interchangeable core in the C keyway, or the 20-057 FSIC rim cylinder. The two figure-eight formats are not interchangeable across a masterkey system.
6) I need a mortise cylinder, not a core - what should I order instead of the BEST 1C?
The BEST 1C Series Standard 5-Pin Cylinder Core is a replacement core for BEST-prepped hardware, not a complete mortise cylinder with a cam. For a conventional mortise cylinder, the Corbin Russwin 1000 Grade 1 Series is offered in a 1-1/2 inch length with an A02 straight cam, and the Corbin Russwin 1070 Grade 1 Series is a 1-1/4 inch 6-pin mortise housing with an A01 cloverleaf cam. Adams Rite also lists the 4036 mortise cylinder as a five-pin Grade 1 unit for doors 1/2 inch and up. Match the cam to the lock body you are feeding.
7) What is the difference between a BEST 1C interchangeable core and a Schlage 20-057 FSIC rim cylinder?
They sit at different points in the assembly. The BEST 1C Series Standard 5-Pin Cylinder Core is the core itself - the keyed plug and shell that drops into compatible BEST housings, ordered by keyway (A through O, plus TB, TC, TD, TE) and finish. The Schlage 20-057 is a full size interchangeable core rim cylinder with a convertible tailpiece cam, meaning it is the rim housing that accepts a core, and the Schlage 20-057-C is supplied as an FSIC core in C keyway with a 643E Aged Bronze finish. If your door already has BEST-prepped housings, you are buying the 1C core; if you are building a rim application from scratch on Schlage FSIC, you need the housing as well as a core.
8) Can I use a Kaba Ilco 1539 or 1599 cylinder in place of a BEST 1C core?
No - they solve different problems. The BEST 1C Series Standard 5-Pin Cylinder Core is a small format core that seats in BEST-compatible core housings and is keyed into a BEST Standard masterkey system. The Kaba Ilco 1539 is a key-in-knob and lever universal cylinder and the 1599 is a key-in-knob replacement cylinder; both are conventional cylinders that replace the keyed plug assembly in a knob or lever, with no interchangeable core housing involved. Use the Ilco parts to rekey a conventional knob or lever, and the 1C where the hardware is already cored for BEST.
9) For an aluminum storefront with an Adams Rite deadlock, do I use a BEST 1C core?
Storefront deadlocks generally take a cylinder built for that lock body rather than a bare core. Adams Rite lists the 4024 cylinder pull with trim plate mounting and the 4025 five pin tumbler cylinder pull with through-screws, both for the MS1847 deadlock and deadlatch, and the 4026 five pin tumbler cylinder pull for the 5017 wood door deadlock and deadlatch. The BEST 1C Series Standard 5-Pin Cylinder Core is the right choice when the opening already uses BEST core-prepped hardware and you are keying it into a BEST Standard system.
10) Should I buy the 1C standard core or the drill resistant / premium version?
The 1C is the baseline standard core for general commercial openings. BEST also offers 1CD drill resistant, 1CDP drill resistant premium, and 1CP premium cores in the same family. If the opening is exterior, cash-handling, or has had attack attempts, step up to a drill resistant core; for interior offices, classrooms and back-of-house doors the 1C is the usual choice.
11) Is a 5-pin BEST core enough security for a commercial building, or should I go 6-pin?
The 1C 5-pin is a commercial-rated core and its 5-tumbler stack suits most commercial access control. The practical decider is your existing system: BEST systems are keyed as either 6-pin or 7-pin depth in most large facilities, and a 5-pin core only operates on a 5-pin keying scheme. Match the pin count already in your building rather than mixing, or you will break masterkeying.
12) My exit device needs a rim cylinder - is the BEST 1C the right part?
Only if the device is already fitted with a BEST-style core housing. The BEST 1C Series Standard 5-Pin Cylinder Core is the core alone. For a conventional rim application you would look at the Schlage 20-021 rim cylinder, a 6-pin unit with a vertical tailpiece cam, or the 20-022 with a horizontal tailpiece cam, or the Corbin Russwin 3070 6-pin rim cylinder housing with a 1-7/8 inch tailpiece. Tailpiece orientation and length are what the device dictates, so confirm those against the exit device before ordering.
13) Is there a 6-pin alternative if 5-pin is not enough for my keying system?
Within the BEST Standard family, the 1C Series Standard 5-Pin Cylinder Core is the foundation standard core, and BEST also offers 1CD drill resistant, 1CDP drill resistant premium, and 1CP premium core configurations. If you are moving off BEST entirely, 6-pin cylinders in the comparable field include the Detex MC65 mortise cylinder in Schlage C keyway at 1-1/8 inch, the Falcon A23161-05 G key-in-lever cylinder in 6-pin G keyway supplied keyed different with two cut keys, and the Corbin Russwin 1080 1-1/2 inch LFIC mortise cylinder for Schlage L9000 mortise locks.
14) What 5-pin cylinder do I use for a residential-style handleset or deadbolt instead of a BEST 1C core?
The BEST 1C Series Standard 5-Pin Cylinder Core is built for commercial door hardware and keys into BEST Standard masterkey systems. For handleset and deadbolt retrofits, Medeco lists the 1075127 5-pin rim type lazy motion single cylinder for handlesets and deadbolts, the 1065140 5-pin retrofit cylinder for Arrow JL interconnected locks and Emtek handleset and deadbolt outside cylinders, and the 1065244 5-pin rim lazy motion cylinder with an Emtek tailpiece. Emtek also lists the CY4 cylinder as a single-unit part.
15) I am replacing a cylinder in a Sargent lever - is the BEST 1C the match?
Not unless that lever is core-prepped for BEST. The BEST 1C Series Standard 5-Pin Cylinder Core drops into BEST-compatible housings. For a Sargent knob or lever, Kaba Ilco lists the 1579 knob and lever cylinder specifically for Sargent, and the 1549 series covers key-in-deadbolt applications. Confirm what is in the door now before choosing between a core and a conventional cylinder.
16) Do the finishes on a BEST 1C core need to match my lever and lockset finish?
Only the core face shows once it is installed, so most buyers match it to the trim. The eight choices run bright and satin brass (605, 606), bright and satin bronze (611, 612), satin bronze oil-rubbed (613), bright and satin chrome (625, 626) and statuary dark bronze (690). For a fleet of doors, 626 satin chrome is the common commercial default; 690 suits dark bronze trim packages.
17) Is the BEST 1C core suitable for a school or hospital keying program?
It is a commercial-duty core used in office buildings, schools, healthcare, retail, industrial and warehouse space, multi-tenant residential and government buildings. For institutions the draw is the masterkey structure plus tool-free core swapping, so lost-key events and tenant turnover are handled by replacing cores rather than locks.
18) Can I match the finish of a BEST 1C core to other cylinders on the same door?
The BEST 1C Series Standard 5-Pin Cylinder Core is offered in 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, which covers the common commercial BHMA finishes. Among the comparable cylinders, the Schlage 20-057-C FSIC core is listed in 643E Aged Bronze, so if you are mixing brands on one opening, check the finish code on each part rather than assuming a visual match.
How fast can I get the BEST BES-1C5A1605 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 BES-1C5A1605 come with a warranty?
Absolutely. The BEST BES-1C5A1605 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-1C5A1605?
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 BES-1C5A1605 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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