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ND Series Grade 1 Cylindrical Indication Trim

Know It's Locked™ visibility comes from the patented 180-degree window of ND Series indication trim. It's large enough to see even from across the room to ensure classroom, security, and privacy needs are met.


Schlage is committed to helping ensure safer classrooms and better privacy solutions with a family of lock status indicator trims on cylindrical, mortise, and deadbolt locks. The exceptionally large viewing window of the ND Series wraps three sides of the lock to deliver patented, 180-degree visibility that can be seen even from across the room. Grade 1 durablity from industry leading Schlage locks, assures longevity in abusive environments like K-12 and higher education schools. Eight functions feature single-sided indication as an option in any ND Series lock finish or lever so you can create the right solution for your security or privacy needs.  

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Mechanical Locks

For frequently asked questions, educational resources and technical product materials visit the Mechanical Locks 101 page. 


  • Exceeds ANSI/BHMA Grade 1 operational and security standards
  • UL listed for 3-hour fire door 
  • Tamper-resistant trim is designed to ensure lock functionality even if message window is compromised                                       
  • Functions with the Vandlgard® feature allow the outside lever to rotate freely up or down to prevent damage from excessive force while in a locked state
  • Patented Everest 29™ S123 keyway is provided standard which prohibits unauthorized key duplication 
  • Restricted geographically exclusive Primus upgraded security options offer advanced key control and exceptional physical security


  • Large window utilizes red and white messaging backgrounds to assure readability for color-blind individuals
  • Patented, 180-degree visibility allows a three-sided view of the lock status
  • Nine lever styles constructed of solid zinc offer a strong-yet-comfortable feel 
  • Indicator trim messaging available English, French, and Spanish languages
  • Nine available finishes with option for antimicrobial coating  
  • All levers suite with ND Series Grade 1 Cylindrical Lock and ALX Series Grade 2 Cylindrical Lock


  • Two non-keyed privacy functions
  • Three keyed functions also available with Vandlgard locked lever protection
  • Custom messaging available - contact us for information

Built to Last

  • Schlage's most robust Grade 1 cylindrical lock
  • Windows are formed of high-density polycarbonate material
  • Every Schlage lock undergoes intensive testing to determine its ANSI grade level including: cycle, resistance, door impact, warped door and bolt strength tests 

Non-keyed functions (single exterior indicator trim only)

  • ND40 Bath/bedroom privacy lock (ANSI F76)
  • ND44 Hospital privacy lock

Keyed functions (single interior indicator trim only)

  • ND50 Entrance/office lock (ANSI F82)     with Vandlgard® ND91
  • ND53 Entrance lock (ANSI F109)     with Vandlgard® ND92
  • ND78 Classroom security lock (180-degree lockdown) (ANSI F110) with Vandlgard® ND98


  • Chassis: Zinc and steel components zinc dichromate plated for corrosion resistance 
  • Door thickness: 1-3/4" standard; 1-3/8" up to 1-11/16" optional using sold separate spacer kits 
  • Handed

Trim Options

  • Viewing windows are made from high-density polycarbonate for durability
  • Nine lever designs made of pressure cast zinc, plated to match product finish specification
  • Milled tactile warning available on all lever designs except Omega
  • Roses: wrought brass, plated to match product finish specification   


  • Backset: 2-3/4" (70 mm) standard; 2-3/8", 3-3/4", and 5" optional
  • Latchbolt: 1/2" (13 mm) throw oil impregnated stainless steel standard; 3/4" throw, 2-3/4" backset anti-friction bolt for pair doors optional
  • Faceplate: square corner 1-1⁄8" x 2-1/4" (29 mm x 57 mm) standard; square corner 1" x 2-1/4" (25 mm x 57 mm) for 2-3/8" backset doors
  • Strike: ANSI curved lip strike 1-1⁄4" x 4-7⁄8" (32 mm x 124 mm) standard; T-strike with box and T-strike with deep box for fire door latch optional
  • Strike lip length: 1-3⁄16" (30 mm) standard; extended lip strikes - 1-3⁄8" and 1-1/2" optional 


  • ANSI A156.2-2017 Series 4000, Grade 1 


  • Complies with ICC A117.1-2017 Accessible and Usable Buildings and Facilities


  • UL 10C and CAN/ULC-S104 listed  
    • 3-hour fire doors: A label single doors 4' x 10' and pair doors 8' x 8' with 3/4" latch option
    • 90-minute fire doors: 8' x 10' pair doors with 3/4" latch option
    • Letter F and UL symbol on latch front indicate listing
  • UL 437 listed when using Primus high-security UL 437 cylinder

California Fire Code

  •  All levers with a return to door of 1/2" (13 mm) or less comply (Rhodes, Sparta, Tubular, Omega, Longitude, and Boardwalk)


  • Florida Building Commision (ASTM E330, E1886, E1996)
  • Miami Dade (TAS 201, 202, 203) requirements for hurricanes
  • TDI (ASTM E330, E1886, E1996)


  • Meets FF-H-106C Series 161


  • Meets BAA (Buy American Act)  


ND Series Lock finishes
605 Bright brass

605 Bright brass


606 Satin brass


612 Satin bronze


613 Oil rubbed bronze


619 Satin nickle


622 Matte black


625 Bright chrome


626 Satin chrome


626AM Satin chrome with antimicrobial coating


643e Aged bronze (simulated equivalent)

Key cylinder, plug and core face finishes


606 Satin brass


522 Bronze (simulated equivalent)


622 Matte black


626 Satin chrome

Open keyways upgradeable to Primus RP

Patented keyways upgradeable to Primus XP

  • Everest 29™ S keyways include S123 (default keyway)
  • Everest 29™ T restricted keyways 
  • Everest 29™ R restricted keyways as SL cylinders in conventional or FSIC formats with the same A2 pinning style of SFIC cylinders
  • Everest 29™ keyways gain restricted, geographic exclusivity in a Primus XP cylinder
  • Available in Conventional and FSIC cylinder formats

Small Format Interchangeable Cores (SFIC)

  • Everest 29™ R restricted keyway family

Master Keying

  • Factory master keying available

Non-Schlage options

Available levers made to fit LFIC cylinders from: 

  • Medeco 32 (ATH, SPA, RHO and TLR only) 
  • Corbin Russwin 6-pin (ATH, SPA, RHO and TLR only) 
  • Corbin Russwin 7-pin (RHO only)
  • Sargent (ATH, SPA, RHO and TLR only) 
  • Yale 6-pin and Medeco 31 (ATH, SPA, RHO and TLR only) 
  •  Yale 7-pin (RHO only) 

Available levers made to fit Conventional cylinders from: 

  • Corbin Russwin (ATH, SPA, RHO and TLR only) 
  • Sargent (ATH, SPA, RHO and TLR only) 

Need Replacement Parts?

Get the resources you need to get in touch with an Allegion team member for Schlage replacement parts.


Additional Resources

Did You Know?

Carrying on the legacy of the groundbreaking push-button lock, Schlage changed the game again with its descendent in 2019—the ALX Series. This series features a patent-pending chassis and revolutionary new modular design.

Case Study

The Value of Visual Indication: Privacy and Security 

These stories can help you understand when and where

to apply indication trims .

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As part of Allegion’s family of pioneering brands, Schlage benefits from the strength, efficiencies, resources, and integration from a global power. In turn, we pass those advantages on to you.

Allegion helps keep people safe and secure where they live, work and visit. With more than 30 brands sold worldwide, we specialize in security around the doorway and beyond. It’s the power of one.