BEST 1EJ/1EK Series High Secur...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$405.00
$368.75
BEST BEST High Security Non-UL 7-Pin Mortise Cylinder with Optional Core, 1-5/32" Diameter BES-1EHS-STANDARD

BEST 1EJ/1EK Series High Security 7-Pin Mortise Cylinder with Interchangeable Core

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Model: BES-1EJ7J4-C4RP3626-SC
From the E Series Cylinders Collection
$405.00
$368.75
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$405.00
$368.75
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BEST 1EJ/1EK Series High Security 7-Pin Mortise Cylinder with Interchangeable Core

Professional High Security Cylinder Solution

The BEST 1EJ/1EK Series high security mortise cylinder delivers professional-grade security with UL437 standard compliance and ANSI A156.5 Grade 1A certification. This 7-pin cylinder features a 1-5/32" diameter with hardened stainless steel alloy construction and includes a special 5C interchangeable core for maximum security applications. The cylinder provides enhanced protection through its stainless steel ring, face, and keyway disc design with 630 nickel-plated satin stainless steel finish.

Professional Features & Benefits

  • High Security Construction: Hardened stainless steel alloy ring, face and keyway disc provide exceptional resistance to tampering and forced entry attempts.
  • UL437 Standard Compliance: Listed by Underwriters Laboratories for key locks, ensuring verified security performance for critical applications.
  • ANSI A156.5 Grade 1A Certification: Meets the highest commercial grade standards for mortise cylinder performance and durability.
  • Precision Threading: 1.150-32 (NS-2A) threaded design with 15/32" diameter ensures secure mounting and proper alignment.
  • 7-Pin Configuration: 1-11/16" mounting length accommodates standard mortise lock preparations with enhanced key control.
  • Interchangeable Core System: Special 5C core allows for easy rekeying and master key system integration without cylinder replacement.
  • Wrench-Resistant Design: High-security cylinder rings machined from stainless steel and hardened to prevent unauthorized removal.
  • Professional Finish: 630 nickel-plated satin stainless steel finish provides corrosion resistance and professional appearance.

Technical Specifications

  • Collection: E Series Cylinders
  • Commercial/Residential: Residential
  • 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: 1EJ/1EK Series
  • Subcategory: Parts and Accessories

Installation & Operation

This high security mortise cylinder is designed for use with compatible BEST mortise lock systems. Special door preparation is required with a 1-3/4" diameter hole for proper installation. The 1EJ7J4 cylinder must be combinated at the factory, while the 1EK7K4 cylinder is available uncombinated where UL listing is not required. Refer to manufacturer documentation for complete installation specifications and core configuration procedures.

Professional Applications

  • High Security Commercial Buildings
  • Government and Municipal Facilities
  • Financial Institution Security Systems
  • Healthcare Facility Restricted Areas
  • Educational Institution Administrative Offices
  • Industrial Facility Secure Storage
  • Multi-Tenant Residential Master Key Systems

Why Choose BEST Quality?

BEST high security cylinders deliver professional-grade protection with UL437 listing and ANSI A156.5 Grade 1A certification for demanding security applications. The hardened stainless steel construction and precision manufacturing ensure reliable performance in critical access control situations. Engineered for professional locksmiths and security professionals who require the highest level of cylinder security and key control.

Manufacturer Resources

E Series Service Manual

Product Specs

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

BEST BES-1EJ7J4-C4RP3626-SC – Frequently Asked Questions

1) Will the BEST 1EJ/1EK mortise cylinder fit a standard mortise lock prep, or does the door need special prep?
Special door prep is required. The 1EJ/1EK high security cylinder needs a 1-3/4 inch diameter hole, not the standard cylinder hole, because the hardened stainless ring sits proud of the face. Threading is 1.150-32 (NS-2A) with a 15/32 inch diameter, and the 7-pin body runs 1-11/16 inches of mounting length. If you're retrofitting into an existing mortise lock case that was bored for a plain 1-5/32 inch cylinder, plan on enlarging the hole before the cylinder will seat.
2) What do I have to specify when ordering a BEST 1EJ/1EK high security cylinder?
Four things, and the order won't go through without them. Keyway is a required pick from A, B, C, D, DD, E, F, G, H, J, K, L, M, N, O, R, TB, TC, TD or TE. Keymark and marking number are both required text entries, so have the facility's key system reference in hand. Then choose finish, the ring, the cam or spindle option, and whether you want the UL-listed or Non-UL type. Skipping the keymark is the most common reason a high security cylinder order stalls, since BEST controls those keyways.
3) Can I get a BEST high security cylinder with an Adams Rite MS cam for an aluminum storefront deadlock?
Yes. An Adams Rite MS cam is one of the cam and spindle choices, alongside a standard cam and a standard spindle. That's what lets this high security cylinder drive an Adams Rite MS style deadlock in a glass front door rather than only a mortise lock case. Confirm the cylinder length your storefront prep allows before you commit, since the 7-pin body is 1-11/16 inches of mounting length.
4) Will a BEST 7-pin high security core work in my existing BEST small format interchangeable core system?
Not directly. The cylinder takes a special 5C interchangeable core, which is a high security core rather than a standard BEST SFIC. It will rekey and master key through the same control key workflow you already use, but the core itself is the high security type, so it has to be keyed into a high security system with a keymark BEST holds on file. If your building is running standard 7-pin BEST cores across the other doors, expect this opening to sit on its own restricted section of the system rather than dropping into the existing one.
5) I need a high security cylinder for a rim exit device, not a mortise lock. Is this the right part?
The 1EJ/1EK is a mortise cylinder body, threaded 1.150-32 to screw into a mortise lock case. A rim device needs a rim cylinder with a tailpiece instead. ZenSupply carries the Schlage 20-021 6-pin rim cylinder with a vertical tailpiece cam and the 20-022 with a horizontal tailpiece cam, and the Corbin Russwin 3070 6-pin rim cylinder housing with a 1-7/8 inch tailpiece. If you want interchangeable core on the rim side, the Schlage 20-057 is a 6-pin FSIC rim cylinder with a convertible tailpiece cam.
6) What is the closest equivalent to a BEST 1EJ/1EK mortise cylinder if the opening uses a different manufacturer's mortise lock?
For a mortise prep on a non-BEST lock, the Corbin Russwin 1000 Grade 1 Series mortise cylinder is the nearest peer, supplied in a 1-1/2 inch length with an A02 straight cam. The BEST 1EJ/1EK cylinder is a 7-pin high security cylinder with a 1-11/16 inch mounting length and 1.150-32 (NS-2A) threading, carrying UL437 listing and ANSI A156.5 Grade 1A certification, and it takes a special 5C interchangeable core. The Corbin Russwin 1000 is a conventional Grade 1 mortise cylinder, so cam style and length must match the lock case rather than the core system.
7) Which interchangeable core mortise cylinder works with Schlage L9000 mortise locks instead of a BEST 7-pin cylinder?
The Corbin Russwin 1080 Grade 1 Series is a 1-1/2 inch 6-pin large format interchangeable core mortise cylinder built for Schlage L9000 mortise locks, supplied with an A01 Schlage L cam. The BEST 1EJ/1EK cylinder uses a special 5C interchangeable core in a 7-pin format with a 1-11/16 inch mounting length, intended for compatible BEST mortise lock systems. The two use different core formats, so a facility standardized on one core will not key the other.
8) If the door takes a rim cylinder rather than a mortise cylinder, what should be ordered?
Rim exit devices need a rim cylinder, not a threaded mortise 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 supplied with two keys; the Schlage 20-057 is a 6-pin full size interchangeable core rim cylinder with a convertible tailpiece cam. The BEST 1EJ/1EK is threaded 1.150-32 (NS-2A) for a mortise lock body, though the same family does include a rim cylinder ring option. Confirm whether the device takes a threaded cylinder or a tailpiece-driven rim cylinder before ordering.
9) What mortise cylinder suits a narrow stile aluminum door where the BEST 7-pin cylinder is too long?
The Adams Rite 4036 is a Grade 1 five-pin mortise cylinder rated for a door thickness of 1/2 inch minimum, which covers narrow stile aluminum applications. The BEST 1EJ/1EK is a 7-pin cylinder with a 1-11/16 inch mounting length and requires a 1-3/4 inch diameter door preparation, and it does offer an Adams Rite MS cam option for MS deadlocks. Measure the available stile depth and the lock case pocket before choosing between the five-pin and seven-pin body.
10) If a facility standardizes on full size interchangeable core, is the BEST 5C core cylinder the same system?
They are different core systems. 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. The BEST 1EJ/1EK takes a special 5C interchangeable core in a 7-pin format, offered across keyways A through R plus TB, TC, TD and TE. A site keyed on one core format needs cylinders of that same format to fall under one master key system.
11) What ring do I order with a BEST 7-pin high security mortise cylinder?
Ring choice is a separate line on the order and it has to match the cylinder body and the door prep. The options are 3E mortise, 6-pin mortise, 7-pin mortise, rim cylinder, and tapered cylinder. For a 7-pin high security cylinder in a mortise lock, the 7-pin mortise ring is the matching part. Tapered rings are the ones you use when the cylinder sits proud and you want a sloped collar rather than a straight one. The rings are machined from stainless steel and hardened so they can't be wrenched off.
12) Do I need a high security cylinder like the BEST 1EJ/1EK, or will a standard Grade 1 mortise cylinder do?
It comes down to attack resistance and key control. The BEST 1EJ/1EK carries UL437 listing and ANSI A156.5 Grade 1A, with a hardened stainless ring, face and keyway disc built to resist drilling and wrenching, plus a restricted keymark so keys can't be copied at a hardware store. On an interior office or a stock room where the concern is just durability, a standard commercial mortise cylinder covers it, and ZenSupply carries the Corbin Russwin 1000 Grade 1 mortise cylinder in 1-1/2 inch length with an A02 straight cam, or the 1070 Grade 1 6-pin mortise housing at 1-1/4 inch with an A01 cloverleaf cam. Reserve the high security cylinder for the openings where a picked or duplicated key is the actual risk.
13) Can I standardize a whole facility on BEST high security cylinders and still master key across departments?
That's what the interchangeable core system is built for. The special 5C core rekeys and integrates into a master key system without pulling the cylinder out of the door, so a facility can carry one keying scheme across mortise locks, storefront deadlocks with the Adams Rite MS cam, and other openings. With ANSI A156.5 Grade 1A certification and UL437 listing on the combinated version, it meets the commercial specs typically written for government, healthcare restricted areas, financial, and education administrative openings. The keymark you supply at order time is what ties every cylinder into the same restricted system, so use the same keymark on every order for that facility.
14) Is a 7-pin BEST cylinder interchangeable with a 6-pin one?
No. Pin count sets the core length and the ring that goes with it, and the 1EJ/1EK is a 7-pin cylinder with a 1-11/16 inch mounting length. A 6-pin core won't fill a 7-pin housing correctly. The ring choices reflect this: 6-pin mortise and 7-pin mortise rings are ordered separately, so match the ring to the pin count of the cylinder you're buying. If your existing system is 6-pin BEST, moving an opening to 7-pin high security means that door runs on a different core stack than the rest.
15) Does a cylinder pull do the same job as a mortise cylinder on an aluminum storefront door?
No. The Adams Rite 4024 is a cylinder pull with trim plate mounting and the 4025 is a five pin tumbler cylinder pull with through-screws, both designed for use with the Adams Rite MS1847 deadlock and deadlatch; the 4026 five pin tumbler cylinder pull serves the Adams Rite 5017 wood door deadlock and deadlatch. Those are pull handles that carry a cylinder, not replacement cylinders for a mortise lock body. The BEST 1EJ/1EK is a threaded 7-pin mortise cylinder for a mortise lock case, and it is offered with an Adams Rite MS cam option for MS-style deadlocks.
16) What is a simpler mortise cylinder to use when high security and interchangeable core are not required?
The Detex MC65 is a 1-1/8 inch 6-pin commercial grade mortise cylinder in the Schlage C keyway, and the Corbin Russwin 1070 is a 1-1/4 inch 6-pin mortise housing with an A01 cloverleaf cam. Both are conventional pinned cylinders. The BEST 1EJ/1EK is a 7-pin cylinder with a hardened stainless steel alloy ring, face and keyway disc, UL437 listing and ANSI A156.5 Grade 1A certification, and a special 5C interchangeable core for rekeying without pulling the cylinder. Choose by whether the opening needs the key control and attack resistance or just a working cylinder in a standard keyway.
17) Can a key-in-knob or key-in-lever replacement cylinder be used in place of a mortise cylinder?
No. The Kaba Ilco 1539 is a key-in-knob and lever universal cylinder, the 1579 is a knob and lever cylinder for Sargent, and the 1599 is a key-in-knob replacement cylinder; the Falcon A23161-05 G is a key in lever cylinder in a 6-pin G keyway, keyed different with two cut keys. Those drop into the knob or lever assembly itself. The BEST 1EJ/1EK is a threaded 1.150-32 (NS-2A) mortise cylinder that screws into a mortise lock case and carries a special 5C interchangeable core. The lock chassis type decides which one the opening takes.
18) What replaces a deadbolt cylinder on a residential handleset rather than a commercial mortise cylinder?
For handleset and deadbolt work the Medeco 1075127 is a 5-pin rim type lazy motion single cylinder for handlesets and deadbolts, the 1012040 is a 6-pin lazy motion rim cylinder for Kwikset single cylinder deadbolts, and the 1065140 is a 5-pin retrofit cylinder for the Arrow JL interconnected lock and Emtek handleset and deadbolt outside cylinder. Kaba Ilco 1549 is a key-in-deadbolt cylinder. The BEST 1EJ/1EK is a threaded 7-pin mortise cylinder with UL437 listing and ANSI A156.5 Grade 1A certification, sized to a 1-11/16 inch mounting length for a mortise lock case, so it is not a deadbolt drop-in.
19) When is a UL listed cylinder required and what is the alternative when it is not?
The BEST 1EJ/1EK is offered in both UL-listed and Non-UL types; the 1EJ7J4 cylinder must be combinated at the factory, while the 1EK7K4 is available uncombinated where UL listing is not required. Peers in the same class include the Corbin Russwin 1000 Grade 1 Series mortise cylinder with an A02 straight cam and the Adams Rite 4036 Grade 1 five-pin mortise cylinder. If the opening is on a fire or security spec that calls out UL437 for key locks, order the UL-listed type and accept factory combinating; if the locksmith pins on site, the uncombinated version fits that workflow.
20) Which rim cylinder housing pairs with a 6-pin key system when a 7-pin mortise cylinder does not fit the device?
The Corbin Russwin 3070 is a 6-pin rim cylinder housing with a 1-7/8 inch tailpiece, and the Schlage 20-021 and 20-022 are 6-pin rim cylinders differing in vertical versus horizontal tailpiece cam. The BEST 1EJ/1EK is a 7-pin threaded mortise cylinder, though a rim cylinder ring is among the ring options in the family. Match the tailpiece length and cam orientation to the exit device chassis, since a rim cylinder that spins but does not reach the retractor will not release the latch.
21) What finishes does the BEST 1EJ/1EK high security cylinder come in, and which ones match satin chrome hardware?
Ten finishes: 605 bright brass, 606 satin brass, 611 bright bronze, 612 satin bronze, 613 satin bronze oil-rubbed, 619 satin nickel, 622 matte black, 625 bright chrome, 626 satin chrome, and 690 statuary dark bronze. For satin chrome trim, order 626. If you're matching BEST's own 630 nickel-plated satin stainless described on the high security ring and face, 626 satin chrome is the closest visual match in the ordering list, though 630 and 626 are not the same finish designation.
22) Where do I find the core pinning and service procedure for BEST E Series cylinders?
BEST publishes an E Series Service Manual covering the cylinder and core procedures for this family, and it's the document to work from for core configuration and installation detail on the 1EJ/1EK. Worth pulling before the install, since the 1-3/4 inch prep hole and the 1.150-32 threading are not the standard mortise cylinder prep a locksmith would default to.
How fast can I get the BEST BES-1EJ7J4-C4RP3626-SC 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-1EJ7J4-C4RP3626-SC come with a warranty?
Absolutely. The BEST BES-1EJ7J4-C4RP3626-SC 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-1EJ7J4-C4RP3626-SC?
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Why buy the BEST BES-1EJ7J4-C4RP3626-SC from ZenSupply?
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