BEST 1EF Series Standard Lost ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$167.00
$119.06
BEST 1EF Series Standard Lost Motion Mortise Cylinder Less Core, 1-5/32" Diameter BES-1EF-LESSCORE

BEST 1EF Series Standard Lost Motion Mortise Cylinder Less Core with 1-5/32" Diameter

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Model: 1EF6F4-C4RP3626-LC
From the E Series Cylinders Collection
$167.00
$119.06
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$167.00
$119.06
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BEST 1EF Series Standard Lost Motion Mortise Cylinder Less Core with 1-5/32" Diameter

Professional Mortise Cylinder Component for E Series Lock Systems

The BEST 1EF Series Standard Lost Motion Mortise Cylinder Less Core provides essential cylinder functionality for E Series mortise lock applications. This professional-grade component features a 1-5/32" diameter construction with solid brass or bronze materials for reliable performance. Available in 6-pin (1-1/8" length) and 7-pin (1-1/4" length) configurations, the cylinder includes standard 1E-C230 cam setup for lost motion operation and RP2 ring package for complete installation compatibility.

Professional Features & Benefits

  • Precise Diameter Specification: 1-5/32" diameter ensures proper fit in mortise lock applications for reliable operation.
  • Dual Length Options: Available in 6-pin (1-1/8" length) and 7-pin (1-1/4" length) configurations to match specific lock requirements.
  • Premium Construction: Solid brass or bronze materials provide exceptional durability and corrosion resistance for long-term performance.
  • Lost Motion Cam Design: Standard 1E-C230 cam (1E-C4 setup) enables lost motion functionality for enhanced security applications.
  • Complete Ring Package: RP2 ring package supplied standard for both 6-pin and 7-pin versions ensures proper installation.
  • Flexible Handing Options: Available in RHO, RHI, LHO, and LHI configurations to accommodate various door applications.
  • E Series Compatibility: Designed specifically for BEST E Series mortise lock systems for seamless integration.

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 cylinder component is designed for use with compatible BEST E Series 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

  • E Series Mortise Lock Replacement
  • Commercial Building Security Upgrades
  • Residential Lock System Maintenance
  • Multi-Tenant Property Management
  • Educational Facility Hardware Service
  • Healthcare Institution Lock Repair
  • Government Building Security Systems

Why Choose BEST Quality?

BEST 1EF Series cylinders deliver professional-grade reliability with solid brass or bronze construction engineered for demanding commercial and residential applications. The precision 1-5/32" diameter and lost motion cam design ensure dependable performance in E Series mortise lock systems. Comprehensive documentation and ring package inclusion provide complete installation support for professional locksmiths and facility managers.

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 1EF6F4-C4RP3626-LC – Frequently Asked Questions

1) Does the BEST 1EF mortise cylinder come with a core, or do I need to order one separately?
No core is included. The 1EF Series is a less core housing, so you supply the BEST interchangeable core that matches your existing keying. That's what makes it useful on a keyed system: you pull the core from the old housing or order one cut to your facility's keyway, drop it in, and the building's keying is unchanged. Order it in 6-pin or 7-pin to match the core you're using.
2) How do I know whether to order the 6-pin or 7-pin BEST 1EF mortise cylinder?
Match the pin count of the core your building is keyed to, not the lock. A 6-pin 1EF housing measures 1-1/8 inches long, the 7-pin measures 1-1/4 inches. A 7-pin core will not seat in a 6-pin housing, so pull an existing core and count the pin stack columns before ordering. Both lengths use the same 1-5/32 inch cylinder diameter, and the RP2 ring package is supplied on both.
3) Will the BEST 1EF cylinder work in an Adams Rite deadlock?
Only if you order it with the Adams Rite MS cam. The 1EF is offered with an Adams Rite MS cam, a standard cam, or a standard spindle, and the cam is what mates the cylinder to the lock body. The MS cam option is what drives an Adams Rite MS style deadlock; the standard cam is for BEST E Series mortise locks. Pick the cam for the lock in the door, because you cannot swap it after the fact by ordering the wrong one.
4) What is the stop pin location on a BEST mortise cylinder and how do I pick right or left?
The stop pin is what fixes the core's rotational reference in the housing, and it has to sit on the correct side for the way the key turns to throw the bolt on your door. It's a required choice on the 1EF, right or left. The cylinder is also offered in RHO, RHI, LHO, and LHI configurations, so determine the door's hand and whether the cylinder is the outside or inside one before you order. Get this wrong and the key turns the wrong direction against the cam.
5) I need a mortise cylinder but my building isn't on BEST interchangeable core. What should I use instead?
The 1EF is only worth ordering if you're running BEST cores, since it ships without one. For a conventional keyed mortise cylinder, the Corbin Russwin 1000 Series is a Grade 1 mortise cylinder in 1-1/2 inch length with an A02 straight cam, and the Corbin Russwin 1070 is a 1-1/4 inch 6-pin mortise housing with an A01 cloverleaf cam. If you're on Schlage C keyway, the Detex MC65 is a 1-1/8 inch 6-pin mortise cylinder in that keyway. Match the cam to your lock body first, then the length.
6) Will a rim cylinder work in place of a mortise cylinder on an exit device?
No - the two mount in completely different ways. A mortise cylinder such as the BEST 1EF threads into the lock case and drives the lock through a cam. A rim cylinder mounts through the door and drives the device with a tailpiece: the Schlage 20-021 is a 6-pin rim cylinder with a vertical tailpiece cam, the Schlage 20-022 is the same cylinder with a horizontal tailpiece cam, and the Corbin Russwin 3070 is a 6-pin rim cylinder housing with a 1-7/8" tailpiece. If your device calls for a rim cylinder, order one of those rather than a mortise body.
7) What is the closest equivalent to a BEST 1EF mortise cylinder housing from another manufacturer?
The BEST 1EF is a mortise cylinder housing supplied less core, in 6-pin (1-1/8") and 7-pin (1-1/4") lengths with the standard 1E-C230 lost motion cam. The nearest cross-brand equivalent in housing form is the Corbin Russwin 1070 Grade 1 Series 1-1/4" 6-Pin Mortise Housing, which uses an A01 cloverleaf cam. Both are mortise housings that take a separate core rather than a fixed pinned plug, so the deciding detail is which cam your lock case requires: the 1E-C230 lost motion cam for BEST E Series mortise locks, or the A01 cloverleaf on the Corbin Russwin.
8) I need a mortise cylinder that comes already keyed instead of one that takes a separate core - what should I order?
The BEST 1EF ships less core, so it needs a core supplied separately before it will operate. If you want a mortise cylinder that arrives as a complete keyed unit, the Detex MC65 is a 1-1/8" 6-pin mortise cylinder in the Schlage C keyway, and the Corbin Russwin 1000 Grade 1 Series mortise cylinder is a 1-1/2" length with an A02 straight cam. Match the cam to the lock case: an A02 straight cam and the BEST lost motion cam drive different lock mechanisms.
9) I have an Adams Rite MS deadlock on an aluminum storefront door - is the BEST 1EF the right cylinder?
The 1EF is offered with an Adams Rite MS cam option alongside the standard cam and standard spindle, so it can be configured to drive an Adams Rite MS deadlock. If you would rather use Adams Rite's own hardware, the 4036 is a five-pin mortise cylinder rated Grade 1 with a 1/2" minimum door thickness, and for a cylinder that doubles as the door pull the 4024 and 4025 are cylinder pulls designed for the MS1847 deadlock and deadlatch - the 4024 mounting to a trim plate and the 4025 using through-screws.
10) I need a replacement cylinder for a knob or lever lock, not a mortise lock - what is the right part?
The BEST 1EF is a mortise cylinder body that threads into a mortise lock case, so it is the wrong form for a knob or lever. For key-in-knob and key-in-lever work, Kaba Ilco offers the 1539 universal key-in-knob/lever cylinder, the 1579 knob and lever cylinder for Sargent, and the 1599 key-in-knob replacement cylinder. Falcon's A23161-05 G is a key-in-lever cylinder for the RU/T series in the 6-pin G keyway, keyed different with two cut keys.
11) I am putting cylinders in Schlage L9000 mortise locks - can I use the BEST 1EF?
The BEST 1EF carries the 1E-C230 lost motion cam intended for BEST E Series mortise lock systems. For Schlage L9000 mortise locks, the Corbin Russwin 1080 Grade 1 Series is a 1-1/2" LFIC mortise cylinder, 6-pin, listed for Schlage L9000 mortise locks with the A01 Schlage L cam. The cam is the whole decision here - the mortise thread is common, but the cam has to turn the specific lock case.
12) Which ring do I order with the BEST 1EF cylinder to make it sit flush in the door?
Rings are how you take up the gap between the cylinder face and the door or escutcheon, and the 1EF is offered with a 3E mortise ring, a 6-pin mortise ring, a 7-pin mortise ring, a rim cylinder ring, or a tapered cylinder ring. As a baseline both the 6-pin and 7-pin versions ship with the RP2 ring package. Measure how far the cylinder stands proud once it's threaded to depth, then choose the collar that brings it flush without leaving thread exposed.
13) Can I match a BEST 1EF cylinder to the finish of the lever and escutcheon already on my doors?
Ten finishes are offered: 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 you know the number stamped on your existing hardware you can order to it directly rather than eyeballing a color. The cylinder body is solid brass or bronze.
14) I'm standardizing cylinders across a whole property. Does the BEST 1EF let me keep one keyway across buildings?
That's the case for a less core housing. Because the 1EF ships without a core, every housing you install takes whatever BEST core your master key system already uses, so the housings become a stocked commodity and the keying lives entirely in the cores. Order the housings in the pin count your system runs, 6-pin or 7-pin, plus the finish that matches each opening, and rekeying later is a core swap with a control key rather than a hardware change.
15) Is the standard spindle option on the BEST 1EF the same thing as a cam?
No, and it changes what the cylinder will drive. The 1EF is offered with a standard cam, an Adams Rite MS cam, or a standard spindle. A cam is the flat driver that operates a mortise lock body; a spindle is a shaft that reaches through to a mechanism set back from the cylinder face. Choose based on what the lock in your door presents behind the cylinder hole, not on what came in the box last time.
16) Is a lazy motion cylinder the same thing as the lost motion cylinder in the BEST 1EF?
They describe a similar idea but land on different hardware. The BEST 1EF is a standard lost motion mortise cylinder using the 1E-C230 cam for E Series mortise locks. The Medeco lazy motion parts are rim type cylinders: the 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. Because those mount as rim cylinders with a tailpiece, they are not a substitute for a threaded mortise body.
17) What interchangeable core cylinder should I use if the facility is standardized on Schlage rather than BEST?
The BEST 1EF is a mortise housing that accepts a BEST-format core and carries the 1E-C230 lost motion cam for E Series mortise locks. For a Schlage-standardized building, the Schlage 20-057 is a 6-pin full size interchangeable core rim cylinder with a convertible tailpiece cam, and the 20-057-C is a full size interchangeable core in the C keyway, 643E aged bronze. Note the form difference: those are rim applications and full size cores, so they do not drop into a mortise lock case the way the 1EF does.
18) The door is a wood door with an Adams Rite deadlock - does the same cylinder pull work?
Not the same one. The Adams Rite 4024 and 4025 cylinder pulls are built for the MS1847 deadlock and deadlatch, while the 4026 is the five-pin cylinder pull for wood door applications, designed for the Adams Rite 5017 wood door deadlock and deadlatch. Confirm which deadlock is in the door before ordering, since the pulls are matched to different lock bodies.
19) What cylinder do I use for a deadbolt instead of a mortise lock?
A mortise cylinder like the BEST 1EF drives a mortise lock case and is not a deadbolt part. For deadbolt work, the Kaba Ilco 1549 is a key-in-deadbolt cylinder, the Medeco 1012040 is a 6-pin lazy motion rim cylinder for Kwikset single cylinder deadbolts, and the Medeco 1075127 is a 5-pin rim type lazy motion single cylinder for handlesets and deadbolts. Pick by the deadbolt brand you are retrofitting, since the tailpiece is what has to match.
20) What cylinder matches an Emtek handleset or an Arrow interconnected lock?
Those take brand-specific retrofit cylinders rather than a mortise body. The Medeco 1065140 is a 5-pin retrofit cylinder for the Arrow JL interconnected lock and for the Emtek handleset and deadbolt outside cylinder, and the Medeco 1065244 is a 5-pin rim lazy motion cylinder supplied with an Emtek tailpiece. Emtek also lists its own CY4 cylinder, sold each.
21) If I want to standardize a whole building on one mortise cylinder line, what are my options?
The BEST 1EF gives you one body across a facility with 6-pin and 7-pin types, ring packages covering 3E mortise, 6-pin mortise, 7-pin mortise, rim cylinder and tapered cylinder, and finishes from 605 bright brass through 626 satin chrome and 690 statuary dark bronze - and since it is supplied less core, the keying decision stays with your core stock. On the Corbin Russwin side, the 1000 Grade 1 Series and the 1070 Grade 1 Series housings give a comparable family, with cams selected per lock: A02 straight on the 1000 and A01 cloverleaf on the 1070.
22) Is there installation documentation for BEST E Series cylinders?
Yes. BEST publishes an E Series Service Manual covering the E Series cylinders, and the 1EF is part of that family. Because this is a replacement component rather than a complete lock, follow the parent lock's installation instructions for the cylinder hole depth and cam alignment, and use the service manual for the core and cylinder work itself.
How fast can I get the BEST 1EF6F4-C4RP3626-LC 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 1EF6F4-C4RP3626-LC come with a warranty?
Absolutely. The BEST 1EF6F4-C4RP3626-LC 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 1EF6F4-C4RP3626-LC?
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
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