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Schlage ND Series Commercial Locks
Allegion's flagship Grade 1 cylindrical lock — tested to 16 million cycles, 3,100 in-lb abusive lever torque (2.5× the Grade 1 standard), UL 3-hour fire rated, and Miami-Dade + Florida Building Code approved. The most-specified commercial cylindrical lock in the United States.
Parent company: Allegion
About Schlage ND Series
The Schlage ND Series is Allegion's top-of-the-line cylindrical lock and widely considered the default spec for commercial construction in the United States. Every ND exceeds ANSI/BHMA A156.2 Series 4000 Grade 1 and is UL Listed for 3-hour A-label fire doors. The chassis is cold-rolled steel, corrosion-treated, with a key-removable outside knob/lever for faster cylinder replacement — a feature unique to the ND that saves 15-20 minutes per cylinder change in the field.
Testing is where the ND stands apart. Schlage's independent lab testing has the ND surviving 16 million cycles without failure (20× the Grade 1 requirement of 800K). Abusive lever torque resistance is tested at 3,100 in-lb — 2.5× the Grade 1 standard. Offset lever pull resistance is rated at 1,600 lb, which defeats typical pry bar attacks on commercial storefronts. For Florida-specific specification, the ND is Miami-Dade Product Control approved at ±80 PSF (singles) / ±50 PSF (doubles) with 3/4" latch throw.
The ND offers 24 mechanical functions and 7 electrified variants, 5 lever designs (Athens, Rhodes, Tubular, Sparta, Omega), and 2 rose designs. The VANDLGARD option adds a breakaway clutch that disengages the outside spindle from the latch when locked — eliminating lever droop and kick-damage on high-abuse openings. Keying runs from standard Everest C123 all the way to Primus XP (geographically-exclusive dealer-restricted). The ND also accepts SFIC and LFIC (Schlage FSIC) cores, plus 10 non-Schlage cylinder formats including Best, Corbin Russwin, Medeco, Sargent, and Yale — making it one of the most keyway-flexible commercial locks in the category. Key-En-Lock is a factory-authorized Schlage dealer and services the full ND lineup across Brevard County.
Schlage ND Series Functions & Models We Service
Cylindrical lock functions correspond to standardized ANSI A156.2 specifications. Architects spec by function (F-number); locksmiths order by the manufacturer's model code. Below is the Schlage ND Series lineup we service across Brevard County.
| Model | Function Name | ANSI | Description |
|---|---|---|---|
| ND10S | Passage | F75 | Latchbolt by lever either side. No locking. Interior corridors, conference rooms. |
| ND25D | Exit | F76 | Outside lever always locked; inside lever always free. No outside key. Exit-only doors. |
| ND40S | Privacy Bed/Bath | F76 | Inside thumbturn/push-button locks. Emergency small-tool release outside. Single-occupancy restrooms. |
| ND44S | Hospital Privacy | F19 | Privacy with emergency key override outside. Hospital patient rooms. |
| ND50PD | Entrance | F81 | Outside lever key-locked; push-button locking inside. Light-commercial entry. |
| ND53PD | Entrance/Office | F82 | Key and push-button outside; push-and-turn inside button locking. Most-specified commercial office function. |
| ND60PD | Vestibule | F88 | Key outside, inside free; key outside when pushbutton locked. Vestibule entry doors. |
| ND66PD | Store Door | F109 | Key both sides; latch by key either side. Retail storefront with dual-key access. |
| ND70PD | Classroom | F84 | Outside lever locked by key; inside always free. Pre-2015 classroom spec. |
| ND73PD | Corridor | F90 | Key or push-button locking from outside. Push-button released by inside lever or closing door. Corridor and office-to-hall. |
| ND75PD | Classroom Security | F110 | Key in either lever locks or unlocks outside. Inside always free. Current K-12 classroom intruder spec. |
| ND80PD | Storeroom | F86 | Outside always locked — key only. Inside always free. Server rooms, records, utility, mechanical. |
| ND82PD | Institution | F32 | Double-cylinder — both sides key-locked. High-security interior utility. |
| ND91PD | Entrance w/ Push-Button | F82 | Push-button locks outside lever until released with key or inside lever. VANDLGARD compatible. |
| ND94PD | Classroom VANDLGARD | F84 | Classroom with VANDLGARD breakaway clutch — outside lever rotates freely when kicked/forced without damaging internals. |
| ND96PD | Storeroom VANDLGARD | F86 | Storeroom with VANDLGARD breakaway trim. School exteriors, public restrooms. |
| ND80PDEL | Electrified Fail-Safe | F86 | Power locks outside lever; power loss unlocks. Stairwell reentry (IBC 1010.1.9.12), fire corridor doors. |
| ND80PDEU | Electrified Fail-Secure | F86 | Power unlocks outside lever; power loss keeps locked. Standard card-reader entry. |
| ND12DEU | Exit Electrified | — | Electrified exit function for communicating/secondary egress with access control. |
ANSI A156.2 F-Function Quick Reference
ANSI A156.2 standardizes cylindrical lock functions so specifications work across brands. When an architect specs "F82 entrance/office," any Grade 1 or Grade 2 cylindrical lock from any brand will meet that function — the choice is brand, keyway, and trim preference.
| ANSI | Function |
|---|---|
| F75 | Passage — no locking |
| F76 | Privacy — inside thumbturn bed/bath |
| F81 | Entrance — key outside, push-button inside |
| F82 | Entry/Office — key locks outside lever |
| F84 | Classroom — key outside, inside free |
| F86 | Storeroom — outside always locked except by key |
| F88 | Vestibule / Apartment — key + button locking |
| F90 | Corridor — key + push-button outside |
| F109 | Store Door — double-cylinder with key-both-sides |
| F110 | Classroom Security — key-lockable from inside |
Schlage ND Series Trim Options
Lever & Knob Designs
| Code | Design | Notes |
|---|---|---|
| ATH | Athens | Curved ADA-friendly lever with return. Most-specified ND lever design. |
| RHO | Rhodes | Traditional curved lever with full return to door. Architectural contemporary. |
| TLR | Tubular | Straight tubular lever with angled return. Mid-century commercial. |
| SPA | Sparta | Angled return lever — common commercial spec, ADA compliant. |
| OME | Omega | Squared-off architectural lever. Premium contemporary aesthetic. |
Rose & Trim Styles
| Code | Style | Notes |
|---|---|---|
| Standard | Round Rose | Standard ND round rose, 2-5/8" diameter. Most-installed trim. |
| Decorative | Decorative Rose | Heavier architectural rose for premium commercial aesthetic. |
| VANDLGARD | VANDLGARD Clutch | Breakaway clutch rose — lever rotates freely when kicked. Retrofittable to existing ND locks. |
Finishes
BHMA-coded architectural finishes. We stock the most-specified finishes (626 satin chrome, 630 satin stainless, 605 bright brass, 612 satin bronze) for fast in-field matching to existing building hardware.
Keying & Cylinders
- Everest C123 (standard) — 6-pin Everest keyway — factory default. Geographically-restricted blank distribution.
- Everest C145 — Standard for new master key systems. Expanded master-keying depth.
- Classic C (Schlage C) — Legacy Schlage C keyway for retrofits into existing Schlage-C buildings.
- Primus (UL437) — Dual-locking pick/drill/impression-resistant cylinder. UL437 certified. Dealer-restricted blanks.
- Primus XP — Geographically-exclusive — only ONE authorized dealer per region can cut the blank. Industry-strongest key control.
- FSIC (Full-Size IC) — Schlage Full-Size Interchangeable Core (JD suffix). Core swap for rekey without lockbody disassembly.
- SFIC (Small-Format IC) — Best-compatible SFIC core (BD suffix). Fast rekey by core swap.
- Less cylinder (LD) — Ordered without cylinder — accepts any 6-pin cylinder from Best, Corbin Russwin, Medeco, Sargent, Yale.
- Construction keying — Temporary construction key disabled when final key is inserted. Prevents post-construction unauthorized access.
Electrified & Access Control Variants
Electrified cylindrical locks replace standard locksets on access-controlled openings — common on card-reader entries, stairwell reentry, and fire corridor doors. All variants maintain code-compliant free egress from the inside.
- ND80PDEL — Fail-safe: Power locks outside lever; power loss unlocks. Required for stairwell reentry under IBC 1010.1.9.12 and fire corridor doors.
- ND80PDEU — Fail-secure: Power unlocks outside lever; power loss keeps locked. Standard card-reader entry.
- RX (Request-to-Exit): Built-in microswitch signals access control when inside lever operates. Logs egress events.
- LX (Latchbolt Monitor): Senses latchbolt position. Confirms door actually latched when closed.
- 12V / 24V DC operation: Compatible with any standard access control power supply. Surge-protected solenoid driver.
- VANDLGARD compatible: Electrified ND variants available with VANDLGARD breakaway clutch for abuse-prone access-controlled openings.
- PoE-friendly: Low-current solenoid design works over typical access control wiring runs up to several hundred feet.
Fire Rating & Code Compliance
- UL Listed for fire-rated doors up to 3 hours A-label (all ND lever-trim variants).
- Miami-Dade Product Control approved with "WS" option — request at order.
- Florida Building Code approved at ±80 PSF (single doors) / ±50 PSF (double doors) with 3/4" latch throw.
- Non-handed — field-reversible without disassembly.
- Electrified variants (ND80PDEL/ND80PDEU) retain UL fire rating when wired per Schlage spec.
- Verify UL label and strike alignment during annual NFPA 80 fire door inspection.
Common Schlage ND Series Repairs We Service
After 25+ years of commercial locksmith work in Brevard County, these are the failure modes we see most often on Schlage ND Series cylindrical locks. All are truck-serviceable — we don't need to remove the door or send hardware to a shop.
- Lever sag / spring return failure — worn return spring after 5-7 years heavy use. On-site spring kit replacement without removing lock from door.
- Cylinder binding / key won't turn — cam alignment drift or retainer loose. Cam re-positioning on-site.
- Key-removable knob stuck — ND-specific issue where the key-removable outside knob retaining mechanism jams. Quick fix with proper Schlage removal tool.
- Latchbolt won't retract on lever press — drive cam worn or hub slipping. Lockbody rebuild with Schlage OEM kit.
- ND80PDEL electrified not releasing — solenoid failure, voltage drop from long wire run, or access control relay issue.
- VANDLGARD clutch not engaging — clutch mechanism wear or debris in rose. Clean + re-grease or clutch replacement.
- Primus/Primus XP cylinder rekey — requires Primus-authorized dealer. We are factory-authorized in Brevard County for Primus and Primus XP.
- SFIC / FSIC core swap — replace cores in 30 seconds per door using existing housing. Facility staff trainable for ongoing rekeys.
- Master key system extension — add doors to existing Schlage master system. On-site pin, test, document.
- Vandal damage retrofit — upgrade standard ND to VANDLGARD for repeat-damage openings. 30-minute kit install.
Need Schlage ND Series Service in Brevard County?
Licensed, insured, 25+ years of commercial lock experience. We stock parts on the truck.
Call (321) 224-5625Frequently Asked Questions
Why is the Schlage ND the most-specified commercial cylindrical lock?
Three reasons. First, the ND survives 16 million cycles in independent lab testing — 20× the Grade 1 requirement. Second, it accepts 10 non-Schlage cylinder formats (Best, Corbin Russwin, Medeco, Sargent, Yale) so you can master-key it into almost any existing building regardless of which brand is already installed. Third, Schlage's dealer and parts network is the deepest in North America — any commercial locksmith stocks ND parts. For architects and facility managers, this translates to "spec this and it'll work anywhere, last decades, and be serviceable by anyone."
What's the difference between ND53PD, ND70PD, ND75PD, and ND80PD?
These are the four most-common ND models and represent the core commercial function set. ND53PD (F82 entrance/office) — key outside, push-button inside, standard commercial office entry. ND70PD (F84 classroom) — key outside, inside always free, pre-2015 classroom spec. ND75PD (F110 classroom security) — key in EITHER lever locks or unlocks outside, teacher can lock from inside during lockdown. Current K-12 spec. ND80PD (F86 storeroom) — outside always locked except by key, inside always free. Server rooms, utility, IT closets. If you're only stocking one ND model for a general office portfolio, stock ND53PD.
Is ND75PD code-compliant for Florida K-12 classroom security?
Yes. The ND75PD (F110 classroom security) meets current Florida school hardware requirements for classroom doors. Key from either side locks or unlocks the outside lever — so a teacher can lock their classroom from inside during a lockdown without opening the door. Inside lever is always free for egress (NFPA 101 compliant). UL 3-hour fire rating when installed on fire-rated classroom doors. We've installed ND75PD across multiple Brevard County K-12 schools and private academies.
What does VANDLGARD do and is it worth the upgrade?
VANDLGARD is a Schlage feature that adds a breakaway clutch between the outside lever and the internal lock mechanism. When someone kicks, hangs on, or stands on the outside lever to force entry, the lever rotates freely without transmitting force to the lockbody — preventing bent levers, sheared spindles, and damaged cams. For school exterior doors, public restroom exits, retail back doors, and anywhere you see repeat vandalism, VANDLGARD is worth it. Standard ND lockbody lifespan is 15 years; VANDLGARD versions running in abuse environments can run 20+ years because the failure mode (lever damage cascading to internal damage) is eliminated. Retrofittable to existing ND locks via kit — 30-minute install per door.
Can the ND80PDEL work with PDK.io or other access control?
Yes. The ND80PDEL (fail-safe) and ND80PDEU (fail-secure) work with any standard 12V or 24V DC access control including PDK.io, Openpath, Brivo, S2, Genetec, LenelS2, Honeywell Pro-Watch, Kantech, CCure, and proprietary systems. Add RX (Request-to-Exit) for egress logging and LX latchbolt monitor for closed-door confirmation — critical for DEA-controlled pharmacy and IT rooms. We install, run low-voltage wiring, and hand off to your access control vendor — or handle end-to-end through our PDK.io dealer authorization.
How does the ND Series compare to the L9000 mortise lock?
The L9000 mortise and the ND cylindrical are both Schlage Grade 1, but they're different product categories for different door types. L9000 has 40+ functions, an integrated 1" deadbolt, and 15-20+ year service life — spec'd for high-traffic entry doors, institutional, multi-family corridors. ND has 24 functions, no integrated deadbolt, and 10-15 year service life — spec'd for most other commercial doors (offices, classrooms, retail, interior). Rule of thumb: entry doors and high-abuse openings → L9000. Everything else → ND. Both share the Everest C123 keyway and Primus XP upgrade, so they master-key together cleanly.
Is the ND really 16 million cycles? That sounds exaggerated.
Independently verified by Schlage in controlled lab testing. For context: a commercial door cycling 200 times per day (retail, school classroom) hits 800K cycles — the Grade 1 minimum — in about 11 years. At 16M cycles, the ND could run that same 200-times-daily use for over 200 years before reaching its tested failure point. Real-world commercial installations routinely show ND locks operational after 20-30 years with only cylinder and spring service. The cycle number isn't marketing — it's the reason specifiers default to the ND.
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