Corbin Russwin 403F67 Grade 1 ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$29.53
Corbin Russwin 403F67 ML2000 Auxiliary Latch

Corbin Russwin 403F67 Grade 1 ML2000 Auxiliary Latch

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Model: 403F67

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

$29.53
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Corbin Russwin 403F67 ML2000 Mortise Lock Auxiliary Latch Replacement Part

Genuine Replacement Auxiliary Latch for ML2000 Series Mortise Locks

The Corbin Russwin 403F67 is a genuine auxiliary latch replacement part designed specifically for use with the ML2000 Mortise Lock series. This commercial-grade component ensures continued reliable operation of your ML2000 mortise lockset by providing a precise-fit, manufacturer-sourced auxiliary latch. Engineered to Corbin Russwin's exacting standards, this part is an essential accessory for maintaining the performance and integrity of ML2000 Series mortise lock installations in commercial door hardware applications.

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 manufactured to precise specifications, ensuring genuine compatibility and reliable performance within the ML2000 Mortise Lock series. As a commercial-grade replacement component, the 403F67 auxiliary latch upholds the operational integrity of your installed mortise locksets. Engineered for demanding commercial applications where dependable door hardware performance is essential.

Product Specs

Product Group:
Lock Parts and Accessories
Product Subgroup:
Parts and Accessories
Product Type:
Auxiliary Latch
Commercial/Residential:
Commercial
Subcategory:
Parts and Accessories
For Use With:
ML2000 Mortise Lock
Product Category:
Mechanical Locks
Department:
Door Hardware

Corbin Russwin 403F67 – Frequently Asked Questions

1) What does the Corbin Russwin 403F67 auxiliary latch actually do in a mortise lock?
The 403F67 is the auxiliary (deadlocking) latchbolt for Corbin Russwin ML2000 series mortise locks. It sits just above the main latchbolt and, when the door closes and the auxiliary plunger is depressed by the strike, it deadlocks the main latch so the latch can't be shimmed or carded. Effective throw on the auxiliary latchbolt is 9/16 inch (14mm). If your ML2000 lock still latches but the latch can be pushed back with a card, this is the part that has failed.
2) Will the 403F67 fit any Corbin Russwin mortise lock, or only certain ones?
It is specified for the ML2000 series mortise lock only. It is not a universal auxiliary latch. Pull your lock case out of the door and confirm the ML2000 designation stamped on the case before ordering; other Corbin Russwin mortise families use different internal parts.
3) Does replacing the auxiliary latch on an ML2000 affect the fire rating of the door?
Using the genuine Corbin Russwin part keeps the assembly as listed. The ML2000 lockset is UL/cUL listed to UL10C positive pressure and carries a 3-hour fire rating up to a 4 ft by 10 ft single door or an 8 ft by 10 ft pair. Substituting a non-Corbin internal component is what puts that listing at risk on a labeled opening.
4) My ML2000 lock case is out of the door - what dimensions and specs should I check against before I order parts?
The ML2000 case is heavy-gauge steel measuring 5-7/8 x 4 x 15/16 inches (149 x 102 x 24mm), with a 2-3/4 inch (70mm) backset and an armored front of 8 x 1-1/4 inches. The main latchbolt is a two-piece anti-friction type at 5/8 x 1 inch with a 3/4 inch (19mm) throw, and the deadbolt is one-piece stainless at 1 inch throw. Standard door thickness is 1-3/4 inches (44mm). If your case matches that footprint, the 403F67 auxiliary latch is the right repair part.
5) Will my existing strike still work after I replace the auxiliary latch?
It should, as long as it is the ML2000 strike. The series uses an ANSI straight lip strike, 4-7/8 x 1-1/4 inches with 1-1/8 inch lip to center. The auxiliary latchbolt needs to land on the solid face of that strike (not in the latch cutout) to deadlock properly at its 9/16 inch effective throw, so check strike alignment while the lock is out. A misaligned strike is a common reason an auxiliary latch appears dead.
6) Do I have to specify handing when ordering a 403F67 auxiliary latch?
No. The ML2000 lock body uses a patented quick reversible latchbolt that can be re-handed without disassembling the lock case, so handing is set at the lock, not at the auxiliary latch. Order the 403F67 as-is for either hand.
7) Is the ML2000 lock this latch goes into a Grade 1 lockset?
Yes. The ML2000 mortise lock is certified to ANSI/BHMA A156.13 Series 1000, Operational and Security Grade 1, and UL cycle tested to 14.5 million cycles (Verification ID V875753). For a hospital, school, or high-traffic office corridor, repairing with the genuine auxiliary latch keeps that tested configuration intact.
8) I manage a building with dozens of ML2000 locks - can I repair them instead of replacing whole locksets?
Yes, and that is the point of stocking this part. A single ML2054 lock body covers 12 functions, so a fleet of ML2000 openings is largely the same case with different trim and keying. Keeping the 403F67 auxiliary latch on the shelf lets you fix the deadlocking failure on any of those doors without swapping out a Grade 1 lockset or re-prepping the door.
9) Does swapping the auxiliary latch mean I have to re-key or change cylinders?
No. The auxiliary latch is a mechanical internal part and has nothing to do with the cylinder. ML2000 locks take a brass 6-pin L4 keyway cylinder as standard, 0-bitted, and they work with new or existing Corbin Russwin key systems as well as most other manufacturers' cylinders. Your keying stays as it is.
10) Is the 403F67 a commercial part or will it work on a residential door?
It is a commercial door hardware component, sold for ML2000 series mortise locks used in offices, schools, healthcare, retail, industrial, multi-tenant residential, and government buildings. It is not a residential-grade item and there is no residential lock it drops into.
How fast can I get the Corbin Russwin 403F67 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 403F67 come with a warranty?
Absolutely. The Corbin Russwin 403F67 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 403F67?
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 403F67 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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