Corbin Russwin ML2000 Grade 1 ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$45.05
$43.32
Corbin Russwin ML2000 Inside Adapter Only, Knob Half Working Trim

Corbin Russwin ML2000 Grade 1 Inside Adapter Only, Knob Half Working Trim

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Model: 427F06

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

$45.05
$43.32
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Corbin Russwin 427F06 ML2000 Mortise Lock Inside Adapter for Knob Half Working Trim

Commercial-Grade Mortise Lock Adapter Component

The Corbin Russwin 427F06 is a precision-engineered inside adapter designed specifically for use with the ML2000 Mortise Lock series, providing a reliable interface for the Knob Half Working Trim configuration. This commercial-grade adapter component ensures proper fitment and smooth operation when integrating knob-style working trim on the inside of ML2000 mortise locksets. Designed for commercial door hardware applications, this adapter delivers the quality and compatibility expected from Corbin Russwin lock parts and accessories.

Professional Features & Benefits

  • ANSI/BHMA Grade 1 mortise lock per A156.13 Series 1000, Operational and Security Grade 1
  • UL Cycle above and beyond: 14.5 Million Cycles (Verification ID: V875753)
  • Patented Quick Reversible latchbolt — reverse handing without disassembling the lock case
  • Multi-function capability: 12 functions configurable from one ML2054 lockbody
  • Heavy-gauge steel lockcase 5-7/8" x 4" x 15/16"; 1" stainless steel deadbolt, 1" throw
  • 3/4" (19mm) throw anti-friction two-piece latchbolt requires less force to close
  • Wide variety of trim designs including Muséo®, Vineyard™, Behavioral Health (BHSS/BLSS)
  • Status indicator options for locked/unlocked visibility (sectional and escutcheon trim)
  • Motorized Electric Latch Retraction (MELR) available for ML20900 series
  • Thru-bolted trim designs for proper alignment and increased security
  • Can be used with new or existing Corbin Russwin key systems; accepts most other manufacturers' cylinders
  • UL/cUL listed, UL10C positive pressure; 3-hour fire door up to 4' x 10' single or 8' x 10' pair
  • Ten-year mechanical warranty; five-year MELR; two-year electrical

Technical Specifications

  • Grade: ANSI/BHMA A156.13 Series 1000, Operational and Security Grade 1
  • Handing: Handed; quick reversible — re-handed without disassembling the lock case
  • Door Thickness: 1-3/4" (44mm) standard; optional thicknesses available
  • Backset: 2-3/4" (70mm)
  • Lockcase: Heavy-gauge steel, 5-7/8" (149mm) x 4" (102mm) x 15/16" (24mm)
  • Armored Front: Wrought brass, bronze, or stainless steel, 8" x 1-1/4"
  • Latchbolt: 2-piece mechanical with anti-friction insert, 5/8" x 1" x 3/4" (19mm) throw
  • Auxiliary Latchbolt: 9/16" (14mm) effective throw; deadlocking
  • Deadbolt: One-piece stainless steel, 19/32" x 1-1/4" x 1" (25mm) throw
  • Strike: Wrought brass, bronze, or stainless steel, ANSI straight lip, 4-7/8" x 1-1/4" x 1-1/8" lip to center
  • Cylinder: Brass, 6-pin L4 keyway, 0-bitted standard
  • Spacing: C. to c. knob/lever to cylinder: 3-5/8" (92mm); knob/lever to thumbturn: 2-7/16" (62mm)
  • Certifications: ANSI/BHMA A156.13 Grade 1; UL/cUL UL10C 3-hour positive pressure; ADA A117.1; California State Fire Marshal; Windstorm/Hurricane certified
  • Warranty: Ten-year mechanical; five-year MELR; two-year electrical

Professional Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Retail Establishments
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • Government and Municipal Buildings

Why Choose Corbin Russwin Quality?

Corbin Russwin lock parts and accessories are engineered to deliver professional-grade reliability and precise compatibility within their respective lock series. The ML2000 Inside Adapter reflects the brand's commitment to commercial-grade construction and accurate fitment for demanding door hardware applications. Trust Corbin Russwin components to maintain the integrity and performance of your ML2000 mortise lock installations.

Product Specs

Product Group:
Lock Parts and Accessories
Product Subgroup:
Parts and Accessories
Product Type:
Adapter
Commercial/Residential:
Commercial
Subcategory:
Parts and Accessories
Product Function:
Adapter
For Use With:
ML2000 Mortise Lock; Knob Half Working Trim
Department:
Door Hardware

Corbin Russwin 427F06 – Frequently Asked Questions

1) What exactly is the Corbin Russwin 427F06 part, and does it include the knob or trim?
The 427F06 is the inside adapter only for the ML2000 mortise lock, used with Knob Half Working Trim. It is the interface component between the lockbody and the inside knob trim, nothing more. No knob, no rose, no lockbody, no cylinder comes with it, so if you are building or repairing a half working trim knob function you still need the trim set and the ML2000 lockbody itself.
2) Will the 427F06 adapter work on any Corbin Russwin mortise lock, or only the ML2000?
ML2000 series only. It is built for the ML2000 mortise lockset and the Knob Half Working Trim configuration on the inside of the door. Other Corbin Russwin mortise families and other brands' mortise cases use different trim interfaces, so treat this as an ML2000-specific service part.
3) Is the ML2000 mortise lockset this adapter belongs to fire rated?
Yes. The ML2000 is UL/cUL listed to UL10C positive pressure and carries a 3-hour fire door rating up to 4 ft x 10 ft single or 8 ft x 10 ft pair. It also meets ANSI/BHMA A156.13 Series 1000 Operational and Security Grade 1 and ADA A117.1, and is California State Fire Marshal and windstorm/hurricane certified.
4) Does this adapter work with lever trim as well as knob trim?
No. The 427F06 is the knob half working trim adapter. Lever trim on the ML2000 uses its own trim components, so if the opening needs ADA lever operation, order the lever trim parts instead of this adapter.
5) What is half working trim on an ML2000 mortise lock, and when would I order an inside adapter for it?
Half working trim means one side of the opening operates the latch while the other side is fixed or non-operating. The 427F06 handles the working knob side on the inside of the door. You order the adapter on its own when the lockbody and knob are fine but the inside trim interface is worn, damaged, or you are converting an existing ML2000 to a knob half working trim arrangement rather than replacing the whole lockset.
6) What door thickness and backset does the ML2000 mortise lock this adapter serves use?
The ML2000 is built for 1-3/4 inch (44mm) doors as standard, with optional thicknesses available, and runs a 2-3/4 inch (70mm) backset. The lockcase is 5-7/8 x 4 x 15/16 inches. If your opening is a standard commercial 1-3/4 inch door with a 2-3/4 backset mortise pocket, the trim and adapter geometry lines up.
7) Does the inside adapter have a hand, or do I need to specify left or right?
The ML2000 lockset is handed, but it uses a patented quick reversible latchbolt that lets you re-hand the lock without disassembling the case. Confirm which side of the door your working knob sits on when you order trim parts, since the 427F06 serves the inside of the opening.
8) Will the existing strike still catch if I only change the inside trim on my ML2000?
Nothing about the strike changes when you swap an inside adapter. The ML2000 keeps its 3/4 inch (19mm) throw two-piece anti-friction latchbolt, 9/16 inch effective auxiliary latchbolt, and where fitted a 1 inch throw stainless deadbolt, all working into the standard ANSI straight lip strike at 4-7/8 x 1-1/4 inches with a 1-1/8 inch lip to center. The adapter only affects how the inside knob drives the retractor.
9) Can I keep my existing cylinder and keying when servicing an ML2000 with this trim part?
Yes. The ML2000 works with new or existing Corbin Russwin key systems and accepts most other manufacturers' cylinders; the standard cylinder is brass, 6-pin, L4 keyway, 0-bitted. Changing the inside adapter does not touch keying, so your master key system stays intact.
10) I manage a portfolio of buildings on ML2000 locks. Is it worth stocking spare inside adapters?
For a fleet standardized on ML2000 mortise locks it is a sensible spare. The lockbody is rated well past normal service (UL cycle verification of 14.5 million cycles, verification ID V875753) and a single ML2054 body covers 12 functions, so the trim interface is usually what gets abused first on high traffic doors in offices, schools, healthcare, retail and multi-tenant residential. Keeping adapters on the shelf lets a tech restore an opening without pulling the whole lockset.
11) Where do the knob and cylinder sit relative to each other on an ML2000 escutcheon?
Center to center from knob or lever to cylinder is 3-5/8 inches (92mm), and knob or lever to thumbturn is 2-7/16 inches (62mm). Those spacings decide whether existing door prep and escutcheon holes line up when you rework trim on an installed ML2000.
How fast can I get the Corbin Russwin 427F06 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 Corbin Russwin 427F06 come with a warranty?
Absolutely. The Corbin Russwin 427F06 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 Corbin Russwin 427F06?
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 Corbin Russwin 427F06 from ZenSupply?
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