BEST 1EF Series Standard Lost ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$269.00
$244.92
BEST BEST 1EF Series Standard Lost Motion Mortise Cylinder with Standard Core, 1-5/32" Diameter BES-1EF-STANDARD

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

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Model: BES-1EF6F4-C4RP3626-SC
From the E Series Cylinders Collection
$269.00
$244.92
Selected Finish is

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

$269.00
$244.92
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BEST 1EF Series Standard Lost Motion Mortise Cylinder with Standard Core 1-5/32" Diameter

Professional Lost Motion Mortise Cylinder Solution

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

Professional Features & Benefits

  • Precision Diameter: 1-5/32" diameter ensures accurate fit in mortise lock applications for reliable operation.
  • Flexible Length Options: Available in 6-pin (1-1/8" length) and 7-pin (1-1/4" length) configurations to accommodate various lock requirements.
  • Heavy-Duty Construction: Solid brass or bronze material provides exceptional durability and corrosion resistance for long-term performance.
  • Lost Motion Design: Standard 1E-C230 cam is pre-configured for lost motion operation with field-selectable handing options.
  • Universal Compatibility: RP2 ring package supplied standard for 6-pin and 7-pin configurations ensures proper installation in most applications.
  • Professional Handing Options: Available in RHO (Right Hand Outside), RHI (Right Hand Inside), LHO (Left Hand Outside), and LHI (Left Hand Inside) configurations.
  • Standard Core System: Compatible with standard core keying systems for flexible key management and rekeying capabilities.

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 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 1-5/32" diameter and lost motion cam design ensure dependable performance in mortise lock systems where consistent operation 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-SC – Frequently Asked Questions

1) What is a lost motion mortise cylinder actually for, and do I need one?
A lost motion cylinder has free play in the cam rotation, so the key turns partway before the cam picks up the lock mechanism. The BEST 1EF Series uses the standard 1E-C230 cam configured for that lost motion operation. You need one where the mortise lock or deadlock calls for it; if your lock takes a conventional cam that engages immediately, order a standard cam version instead. The cam is one of the choices on the cylinder, with Standard Cam, Adams Rite MS Cam, and Standard Spindle available.
2) Should I order the 6-pin or 7-pin BEST 1EF cylinder?
It comes down to the length your lock case needs and the pinning of your existing key system. The 6-pin 1EF cylinder is 1-1/8 inches long, the 7-pin is 1-1/4 inches. Match the pin count to the rest of your BEST small format cores so one key system works across the building, then confirm the lock body accepts that length. Ring packages are offered for both, including 6-pin Mortise and 7-pin Mortise rings.
3) Will the BEST 1EF cylinder fit my mortise lock bore?
The cylinder body is 1-5/32 inches in diameter, which is the standard mortise cylinder thread size, so it threads into a conventional mortise lock cylinder hole. What still has to be checked is length: 1-1/8 inches for the 6-pin, 1-1/4 inches for the 7-pin, measured from the ring face. If the cylinder sits proud of the trim, a thicker ring or the next length down is the fix.
4) Do I have to specify handing on this cylinder?
Handing matters here. The 1EF is offered in RHO (right hand outside), RHI (right hand inside), LHO (left hand outside), and LHI (left hand inside), and the lost motion cam handing is field selectable. Separately, you pick the stop pin location, right or left, when you order. Get the door hand and which face of the door the cylinder goes in before placing the order.
5) What do I have to tell you when I order a BEST 1EF cylinder for an existing key system?
Four things are required: the keyway, the stop pin location (right or left), the keymark, and the marking number. Keyway choices run A, B, C, D, DD, E, F, G, H, J, K, L, M, N, O, R, TB, TC, TD, and TE. Keymark and marking number come off the existing cores or your keying schedule, which is how the new cylinder lands on the same key as the rest of the doors.
6) Can I use this on an Adams Rite MS deadlock in an aluminum storefront?
Yes, provided you order the Adams Rite MS cam option. That cam is one of the choices on the 1EF cylinder alongside the standard cam and standard spindle, and it is what drives the MS style hook bolt mechanism. A standard cam will not operate an MS deadlock. Adams Rite also builds its own 4036 mortise cylinder, a five-pin Grade 1 unit, if you would rather stay with the lock manufacturer's cylinder instead of putting the opening on a BEST keyway.
7) I need a rim cylinder for an exit device, not a mortise cylinder. Is this the right part?
No. The 1EF is a mortise cylinder that threads into a lock case. For a rim exit device you want a rim cylinder with a tailpiece, for example the Schlage 20-021 six-pin rim cylinder with vertical tailpiece cam or the 20-022 with a horizontal tailpiece cam, or the Corbin Russwin 3070 six-pin rim housing with a 1-7/8 inch tailpiece. If you need the opening on an interchangeable core system, the Schlage 20-057 is a six-pin FSIC rim cylinder with a convertible tailpiece cam.
8) I need an interchangeable core mortise or rim cylinder instead of a standard core - what should I look at?
The BEST 1EF Series ships with a standard core, keyed to the keymark and marking number you specify. If the facility runs an interchangeable core program, the Corbin Russwin 1080 Grade 1 is a 1-1/2 inch LFIC 6-pin mortise cylinder set up for Schlage L9000 mortise locks with an A01 Schlage L cam. On the rim side, the Schlage 20-057 is a 6-pin FSIC rim cylinder with a convertible tailpiece cam, and the 20-057-C is a full size interchangeable core in C keyway, 643E aged bronze. LFIC and FSIC cores are not cross-compatible, so match the program already in the building.
9) Will a BEST 1EF mortise cylinder work in an Adams Rite MS deadlock, or is there a better choice?
The BEST 1EF Series is offered with an Adams Rite MS Cam option, which is what an MS deadlock requires. If you would rather use Adams Rite's own part, the 4036 is a five-pin mortise cylinder rated Grade 1 with a 1/2 inch minimum door thickness. For MS1847 deadlock and deadlatch openings that need a pull rather than a plain cylinder, the Adams Rite 4025 is a five-pin cylinder pull with through-screws and the 4024 is a cylinder pull with trim plate mounting; the 4026 five-pin cylinder pull is for the 5017 wood door deadlock instead.
10) Can I use a BEST 1EF cylinder to rekey a key-in-lever or key-in-knob lockset?
No - the BEST 1EF Series is a mortise-format cylinder built on the 1E-C230 lost motion cam for mortise lock cases. Key-in-knob and key-in-lever chassis take a different cylinder body. For those, 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 for the RU/T series, 6-pin G keyway, keyed different with two cut keys. For deadbolts specifically, the Kaba Ilco 1549 is a key-in-deadbolt cylinder.
11) Are the collars or rings included, or do I order them separately?
The RP2 ring package is supplied as standard with the 6-pin and 7-pin configurations. Beyond that, ring selection is part of the order, with 3E Mortise, 6-pin Mortise, 7-pin Mortise, Rim Cylinder, and Tapered Cylinder options. Use the ring to take up the gap between the cylinder shoulder and the escutcheon or lock face so the cylinder finishes flush.
12) Will this match the finish on the rest of my door hardware?
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. Match the BHMA number on your existing trim rather than the name, since 626 satin chrome and 619 satin nickel look close on a drawing and clearly different on the door.
13) Does the BEST 1EF cylinder come with a core and keys, or is it a housing only?
It is supplied as a standard core configuration, not a bare housing, and it works within standard core keying systems so it can be rekeyed as your key schedule changes. Because keymark and marking number are required at order, the cylinder is built to your keying rather than shipped keyed at random. If you specifically want a housing to accept cores you already hold, a housing-only part such as the Corbin Russwin 1070 1-1/4 inch six-pin mortise housing is a different animal and is keyed to Corbin Russwin, not BEST.
14) I need a mortise cylinder for a Schlage L9000 mortise lock. Does this one work?
The 1EF puts the opening on a BEST keyway with a lost motion cam, which is not what an L9000 expects. For an L9000 the direct fit is the Corbin Russwin 1080 1-1/2 inch LFIC six-pin mortise cylinder, listed for Schlage L9000 mortise locks with the A01 Schlage L cam. Cam style is the deciding factor on any mortise lock swap, so match the cam before the keyway.
15) A residential handleset or deadbolt needs a lazy motion cylinder - is the BEST 1EF the right part?
Lost motion and lazy motion describe the same idea of a cam that free-spins before engaging, but the BEST 1EF Series is a mortise-format body and will not drop into a residential handleset or deadbolt. For those, Medeco offers rim-type lazy motion cylinders: 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, and the 1065244 is a 5-pin rim lazy motion cylinder with an Emtek tailpiece. The Medeco 1065140 is a 5-pin retrofit for Arrow JL interconnected locks and Emtek handleset and deadbolt outside cylinders, and Emtek's own CY4 cylinder is sold each.
16) I need a simple 6-pin mortise cylinder in a Schlage C keyway - what is the alternative to the BEST 1EF?
The BEST 1EF Series is keyed in BEST keyways, offered in A, B, C, D, DD, E, F, G, H, J, K, L, M, N, O, R, TB, TC, TD and TE, with a stop pin location of right or left. If the building is keyed to a Schlage C keyway instead, the Detex MC65 is a 1-1/8 inch 6-pin commercial grade mortise cylinder in Schlage C keyway. Note that the BEST C keyway and the Schlage C keyway are different keyways despite sharing a letter.
17) What is the cylinder body made of, and will it hold up in an exterior door?
Solid brass or bronze construction, which is what gives it corrosion resistance on exterior and coastal openings. That is the same reason the finish options run through bronze and oil-rubbed bronze, plated over a non-ferrous body rather than steel.
18) Where can I get the service and keying documentation for this cylinder?
BEST publishes an E Series Service Manual covering this cylinder family, and the 1EF sits in the E Series Cylinders collection. It is the reference for cam changes, core removal, and setting the lost motion handing in the field.
How fast can I get the BEST BES-1EF6F4-C4RP3626-SC 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-SC come with a warranty?
Absolutely. The BEST BES-1EF6F4-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-1EF6F4-C4RP3626-SC?
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-SC from ZenSupply?
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