BEST 1EF Series Standard Lost ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$286.00
$261.31
BEST BEST 1EF Series Standard Lost Motion Mortise Cylinder with Premium Core, 1-5/32" Diameter BES-1EF-PREMIUM

BEST 1EF Series Standard Lost Motion Mortise Cylinder with Premium Core

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Model: BES-1EF6F4-C4RP3626-PC
From the E Series Cylinders Collection
$286.00
$261.31
Selected Finish is

In Stock (leaves warehouse same day if ordered before 3pm ET)

$286.00
$261.31
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BEST 1EF Series Standard Lost Motion Mortise Cylinder with Premium Core

Professional Mortise Cylinder Component

The BEST 1EF Series Standard Lost Motion Mortise Cylinder delivers professional-grade security for mortise lock applications. This premium core cylinder features a 1-5/32" diameter with solid brass or bronze construction and includes the 1E-C230 cam configured for lost motion operation. Available in 6-pin (1-1/8" length) and 7-pin (1-1/4" length) configurations with standard RP2 ring package for versatile installation requirements.

Professional Features & Benefits

  • Precision Diameter: 1-5/32" diameter ensures proper fit in standard mortise lock preparations.
  • Flexible Length Options: Available in 6-pin (1-1/8" length) and 7-pin (1-1/4" length) configurations to match specific lock requirements.
  • Heavy-Duty Construction: Solid brass or bronze materials provide exceptional durability and corrosion resistance for long-term performance.
  • Lost Motion Configuration: Standard 1E-C230 cam is factory-configured for lost motion operation, eliminating field modification requirements.
  • Versatile Handing Options: Available in RHO (Right Hand Outside), RHI (Right Hand Inside), LHO (Left Hand Outside), and LHI (Left Hand Inside) configurations.
  • Standard Ring Package: Includes RP2 ring package for 6-pin and 7-pin cylinders unless otherwise specified for consistent installation.
  • Professional Ordering System: Structured ordering procedure ensures accurate specification of all configuration options including handing and stop pin placement.

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: 1EF Series
  • Subcategory: Parts and Accessories

Installation & Operation

This replacement cylinder component is designed for use with compatible BEST mortise lock 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
  • Retail Establishments
  • Multi-Tenant Residential Properties
  • Government and Municipal Buildings
  • Industrial and Warehouse Facilities

Why Choose BEST Quality?

BEST 1EF Series cylinders deliver professional-grade reliability with solid brass or bronze construction engineered for demanding commercial applications. The precision-manufactured components ensure consistent operation and long-term durability where dependable security performance is essential.

Manufacturer Resources

E Series Service Manual

Product Specs

Series:
1EF 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-1EF6F4-C4RP3626-PC – Frequently Asked Questions

1) What does "lost motion" mean on the BEST 1EF mortise cylinder, and when do I need it?
Lost motion means the cam is set up to turn freely through part of its rotation before it engages the lock, which is what mortise lock functions that need a free-turning key stage require. On the 1EF Series the 1E-C230 cam comes from the factory already configured for lost motion, so there is no field modification to make the cylinder behave that way. If your mortise lock calls for a direct-drive cam instead, this is not the cylinder for that opening.
2) Do I order the 6-pin or the 7-pin BEST 1EF cylinder?
It follows the lock prep and the core your facility is keyed to. The 6-pin version is 1-1/8 inches long and the 7-pin is 1-1/4 inches. If your building is already standardized on 7-pin BEST cores, ordering 6-pin gives you a cylinder your existing keys will not run. Match the pin count to the rest of your system first, then confirm the mortise prep depth accepts the longer 1-1/4 inch body.
3) Will a BEST 1EF cylinder fit a standard mortise lock cylinder hole?
The 1EF cylinder body is 1-5/32 inches in diameter, which is the standard mortise cylinder diameter used in mortise lock preparations, so it threads into a conventional mortise cylinder hole. What still has to match is length: 1-1/8 inches on the 6-pin, 1-1/4 inches on the 7-pin, plus whatever collar ring you use to bring the face flush with the trim.
4) What do I have to specify when ordering a BEST 1EF lost motion cylinder?
Four things are required at order time beyond finish: keyway (WA, WB, WC, WD, WE, WG, WH, WK or WY), stop pin location (right or left), your keymark, and the marking number. Stop pin location is the one people skip, and it is tied to handing, RHO, RHI, LHO or LHI. Get the stop pin on the wrong side and the cam will not be oriented correctly for the lock.
5) Can I use a BEST 1EF cylinder on an Adams Rite MS deadlock?
Yes, if you order it with the Adams Rite MS cam. Cam choice is an ordering option on the 1EF, covering the Adams Rite MS cam, the standard cam, and a standard spindle. The MS cam is what drives an Adams Rite MS-style deadlock; the standard cam will not.
6) I need a mortise cylinder but I am not on a BEST keyway. What else is there?
If your building is not keyed to BEST, the 1EF will not integrate with your key system regardless of cam. Corbin Russwin mortise housings are the common alternative: the 1000 Series in 1-1/2 inch length with an A02 straight cam, or the 1070 Series 1-1/4 inch 6-pin housing with an A01 cloverleaf cam. For Schlage L9000 mortise locks there is the Corbin Russwin 1080, a 1-1/2 inch LFIC 6-pin mortise cylinder with the A01 Schlage L cam. On a Schlage C keyway, the Detex MC65 is a 1-1/8 inch 6-pin mortise cylinder.
7) Is a mortise cylinder the same thing as a rim cylinder? I am replacing one on an exit device.
No. A mortise cylinder threads into the lock body and drives a cam; a rim cylinder mounts through the door and drives a tailpiece, which is what most surface exit devices take. The BEST 1EF is a mortise cylinder. For a rim application look at the Schlage 20-021 (6-pin, vertical tailpiece cam) or 20-022 (horizontal tailpiece cam), or the Corbin Russwin 3070 6-pin rim housing with a 1-7/8 inch tailpiece.
8) I need a mortise cylinder for a Schlage L9000 mortise lock, not a BEST lock. What should I use instead of the 1EF?
The BEST 1EF Series lost motion mortise cylinder ships with the 1E-C230 cam configured for lost motion operation, which is a BEST mortise lock cam. For a Schlage L9000 mortise lock, the Corbin Russwin 1080 Grade 1 Series 1-1/2 inch LFIC mortise cylinder is built for that application in 6-pin with an A01 Schlage L cam. Match the cam to the lock body you are actually working on.
9) What is the closest straight-cam mortise cylinder alternative if lost motion is not what the lock needs?
The BEST 1EF cylinder is factory-set for lost motion with the 1E-C230 cam, so it is wrong for a lock that needs a direct-drive cam. The Corbin Russwin 1000 Grade 1 Series mortise cylinder at 1-1/2 inch length uses an A02 straight cam, and the Corbin Russwin 1070 Grade 1 Series 1-1/4 inch 6-pin mortise housing uses an A01 cloverleaf cam. Pick by the cam shape the mortise lock chassis expects.
10) The opening is a rim exit device, not a mortise lock. Can I order the 1EF for it?
The BEST 1EF is a mortise cylinder at 1-5/32 inch diameter for mortise lock preparations, though the ring options do include a rim cylinder ring. If you want a purpose-built rim cylinder, the Schlage Commercial 20-021 is 6-pin with a vertical tailpiece cam and the 20-022 is 6-pin with a horizontal tailpiece cam, both supplied with two keys. Corbin Russwin also offers the 3070 6-pin rim cylinder housing with a 1-7/8 inch tailpiece.
11) I have an Adams Rite MS deadlock on an aluminum storefront. Is the 1EF the right cylinder?
The BEST 1EF can be ordered with an Adams Rite MS cam as a cam option, which covers MS deadlock use with a BEST premium core. If you want the Adams Rite part instead, the 4036 mortise cylinder is a five-pin Grade 1 cylinder listed down to a 1/2 inch minimum door thickness. For an MS1847 deadlock where you also need a pull, the Adams Rite 4024 cylinder pull mounts with a trim plate and the 4025 is a five-pin cylinder pull with through-screws.
12) The lock is a key-in-lever, not a mortise. What replaces the 1EF there?
The BEST 1EF is a mortise cylinder and will not drop into a key-in-lever chassis. Kaba Ilco offers the 1539 Series key-in-knob and lever universal cylinder and the 1579 for Sargent knobs and levers, and the 1599 is a key-in-knob replacement cylinder. Falcon lists the A23161-05 G key-in-lever cylinder for RU/T series, 6-pin G keyway, keyed different with two cut keys.
13) Lost motion and lazy motion sound the same. Are the Medeco rim cylinders a substitute for the BEST 1EF?
They describe similar cam behavior but the parts are not interchangeable. The BEST 1EF is a 1-5/32 inch diameter mortise cylinder with the 1E-C230 lost motion cam for mortise lock preparations, offered in 6-pin at 1-1/8 inch and 7-pin at 1-1/4 inch. The Medeco 1012040 is a 6-pin lazy motion rim cylinder for Kwikset single cylinder deadbolts and the 1065244 is a 5-pin rim lazy motion cylinder with an Emtek tailpiece. Rim cylinders mount to the back of the door with a tailpiece, not into a mortise lock body.
14) We run an interchangeable core program. How does the BEST 1EF compare to a Schlage FSIC cylinder?
The BEST 1EF takes a BEST premium core in a 1-5/32 inch mortise housing with lost motion cam, ordered by keyway, keymark and marking number. The Schlage 20-057 is a 6-pin FSIC rim cylinder with a convertible tailpiece cam and two keys, and the 20-057-C is a full size interchangeable core in C keyway with a 643E aged bronze finish. The Schlage parts serve rim applications and the Schlage core system; the BEST housing serves mortise locks on a BEST core system.
15) Does the BEST 1EF cylinder come with a collar ring, or do I order that separately?
A ring package ships with it: RP2 is the standard package on both the 6-pin and 7-pin cylinders unless you specify otherwise. Ring selections cover 6-pin mortise, 7-pin mortise, 3E mortise, rim cylinder and tapered cylinder, so if your trim needs a different projection you call that out on the order rather than buying rings after the fact.
16) What finishes does the BEST 1EF mortise cylinder come in so I can match the rest of my 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. Those are BHMA finish numbers, so if the escutcheons on your other doors are marked 626, ordering 626 here gives you a match across the building.
17) Does the BEST 1EF cylinder ship with a core and keys already in it?
It is supplied with a premium core, and you give the keymark and marking number when ordering so the core is cut to your system. That is a required entry, not optional, which is what lets the cylinder drop into an existing BEST master key system rather than arriving keyed at random.
18) What do I order for a wood door Adams Rite deadlock rather than an aluminum one?
The BEST 1EF with the Adams Rite MS cam option suits MS-style deadlocks. For a wood door application, the Adams Rite 4026 five-pin tumbler cylinder pull is made for the Adams Rite 5017 wood door deadlock and deadlatch, which is a different lock body than the MS1847 the 4024 and 4025 serve.
19) Is there a simpler fixed-keyway mortise cylinder if I do not need the interchangeable core?
The BEST 1EF Series carries a premium core and is ordered with a BEST keyway from WA through WY plus keymark and marking number. If you do not need a core system, the Detex MC65 mortise cylinder comes in Schlage C keyway, 1-1/8 inch, 6-pin commercial grade. The Adams Rite 4036 is a five-pin Grade 1 mortise cylinder. Emtek also lists the CY4 cylinder as a single unit.
20) I need a retrofit cylinder for an Emtek handleset. Will the BEST 1EF work?
The BEST 1EF is a mortise cylinder for mortise lock preparations and is not an Emtek handleset retrofit. Medeco lists the 1065140 5-pin retrofit cylinder for the Arrow JL interconnected lock and Emtek handleset and deadbolt outside cylinder, and the 1065244 5-pin rim lazy motion cylinder with an Emtek tailpiece. Emtek also sells the CY4 cylinder individually.
21) Is the BEST 1EF cylinder solid brass, and will it hold up on an exterior door?
Construction is solid brass or bronze, which resists corrosion and is why these get used on exterior and high-traffic openings in offices, schools, healthcare and government buildings. Finish choice matters outdoors as much as material, satin chrome (626) and statuary dark bronze (690) being the usual picks for weather-exposed trim.
How fast can I get the BEST BES-1EF6F4-C4RP3626-PC 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-1EF6F4-C4RP3626-PC come with a warranty?
Absolutely. The BEST BES-1EF6F4-C4RP3626-PC 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-1EF6F4-C4RP3626-PC?
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-1EF6F4-C4RP3626-PC from ZenSupply?
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