Corbin Russwin 425F86-8 Grade ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$8.40
Corbin Russwin 425F86-8 ML2000 Flat Screw, 8-32 x 3/8"

Corbin Russwin 425F86-8 Grade 1 ML2000 Flat Screw, 8-32 x 3/8"

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Model: 425F86-8

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

$8.40
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Corbin Russwin 425F86-8 ML2000 Mortise Lock Flat Screw Replacement Part, #8-32 x 3/8"

Precision Replacement Screw for ML2000 Series Mortise Locksets

The Corbin Russwin 425F86-8 is a genuine replacement flat screw designed specifically for use with the ML2000 Mortise Lock. Sized at #8-32 x 3/8", this Phillips Flat Head Undercut Machine Screw-TITE is engineered to exact specifications for reliable, secure fastening in commercial door hardware applications. As an OEM-matched component, it ensures proper fit and function when servicing or assembling ML2000 Series mortise locksets.

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 parts and accessories are manufactured to commercial-grade standards, ensuring precise fit and reliable performance within the ML2000 Mortise Lock series. Each replacement component is engineered to maintain the integrity and function of the original hardware assembly. Designed for demanding commercial door hardware applications where dependable, long-term performance is essential.

Product Specs

Product Group:
Parts and Accessories
Product Subgroup:
Parts and Accessories
Product Type:
Screw Pack
Commercial/Residential:
Commercial
Subcategory:
Parts and Accessories
Product Function:
Flat Screw
For Use With:
ML2000 Mortise Lock
Product Size:
#8-32 x 3/8"
Screw Specs:
Phillips Flat Head Undercut Machine Screw-TITE
Department:
Door Hardware

Corbin Russwin 425F86-8 – Frequently Asked Questions

1) What exactly is the Corbin Russwin 425F86-8 screw and what does it fit?
It's a genuine Corbin Russwin replacement fastener for the ML2000 Series mortise lock, a #8-32 x 3/8 inch Phillips flat head undercut machine screw (Screw-TITE type). It's the fastener only, not a lock or trim assembly, so order it when you're servicing or reassembling an ML2000 lockbody and need the original hardware rather than a hardware-store substitute.
2) Can I just use a generic #8-32 machine screw from the hardware bin instead of the 425F86-8?
Not reliably. The thread size matches a common #8-32, but this one is an undercut flat head with a Screw-TITE thread form, which is what lets it seat flush in the ML2000 prep and hold without backing out under cycling. A standard flat head at the same 3/8 inch length can sit proud or strip the mating hole. On a Grade 1 mortise lock rated to 14.5 million cycles, the OEM fastener is the part to use.
3) Is the 425F86-8 a replacement lock, or just the screw?
Just the screw. Ordering it does not bring an ML2054 lockbody, trim, cylinder, or strike with it. If you need the full lock, you're looking for the ML2000 Series mortise lockset itself, which uses a 2-3/4 inch backset and a 5-7/8 x 4 x 15/16 inch heavy-gauge steel lockcase.
4) Will this screw work on our ML2000 locks if the doors are non-standard thickness?
Yes. The #8-32 x 3/8 inch screw is an internal lock-component fastener, so it isn't affected by door thickness. The ML2000 lockbody itself is built for 1-3/4 inch doors as standard with optional thicknesses available, and the screw is the same part across those.
5) We maintain a building full of Corbin Russwin mortise locks. Is this the screw to keep on the truck?
If those locks are ML2000 Series, yes. The 425F86-8 is the commercial-grade OEM fastener for that family, and since the ML2054 body can be configured to 12 different functions, one screw covers a lot of different openings in the same building. Note the size though, #8-32 x 3/8 inch. Corbin Russwin uses other screw lengths elsewhere in the lock, so match the part number, not just the thread.
6) Does replacing a screw with this part affect the fire rating on our labeled mortise locks?
Using the genuine Corbin Russwin fastener is what keeps the assembly as listed. The ML2000 lock carries UL/cUL UL10C positive pressure listing for 3-hour fire doors up to 4 ft x 10 ft single or 8 ft x 10 ft pair, and that listing applies to the lock assembled with its OEM components. Substituting a non-OEM screw on a labeled door is where inspectors take issue.
7) Is a Phillips driver all I need to install the 425F86-8?
Yes, it's a Phillips drive flat head. Keep the driver square in the recess, the head is undercut so it pulls flush quickly and a cammed-out bit will chew the recess before you notice.
8) Is the 425F86-8 handed, or does re-handing the lock change which screws I need?
The screw isn't handed. The ML2000 uses a patented quick reversible latchbolt that re-hands without disassembling the lock case, so a handing change doesn't call for different fasteners at all.
How fast can I get the Corbin Russwin 425F86-8 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 425F86-8 come with a warranty?
Absolutely. The Corbin Russwin 425F86-8 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 425F86-8?
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 425F86-8 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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