Lock Function Guide

Find a Function

What Is a Lock Function?

A lock function describes how a lock operates: which side locks, what locks it, and how people get in and out. Storeroom, classroom, privacy and passage are all functions. The right function for each door keeps the space secure while keeping the way out free, so it's one of the first decisions on a hardware schedule.

How to Read a Lock Function

A lock function is the set of rules for how a lock opens. It tells you which side locks, what locks it, and whether the inside lever always lets people out.

Start with the outside

The function sets what someone in the hall can do: open the door freely, open it only with a key, or not at all.

Then the inside

Most functions leave the inside lever free so people can always get out. A few lock both sides, and those are only for spaces where codes allow it.

Match the numbers

Every function has a PDQ number for quotes and orders, and an ANSI/BHMA number that specs and hardware schedules use. The chart below shows both.

Free: lever always opens the door Lockable: can be locked or unlocked Locked: rigid lever, key only

Lock type	BHMA standard	Function numbers	Example
Cylindrical and tubular	ANSI/BHMA A156.2	F75 to F110	Storeroom = F86 = PDQ 115
Mortise	ANSI/BHMA A156.13	F01 to F34	Storeroom = F07 = PDQ MR115
Interconnected	ANSI/BHMA A156.12	F95, F97, F98	Entry, single cylinder = F95 = PDQ CL126
Deadbolts	ANSI/BHMA	E-numbers	Single cylinder = E2152 = PDQ KV116

8 Functions Behind Most Commercial Doors

These eight cover most openings on a commercial hardware schedule. Each card shows what the outside and inside levers do.

Passage

Cylindrical 126 · F75Mortise MR126 · F01

Outside Always free

Inside Always free

Use it forCorridors, closets and meeting rooms that never lock.

PDQ seriesXGTGTGPSDSFSXSVTJMR

Privacy

Cylindrical 176 · F76Mortise MR176 · F22

Outside Locked by the inside button or thumbturn. Emergency release outside.

Inside Always free

Use it forSingle-occupant restrooms, lactation rooms and bedrooms.

PDQ seriesXGTGTGPSDSFSXSVTJMR

Storeroom

Cylindrical 115 · F86Mortise MR115 · F07

Outside Always locked. Key opens it.

Inside Always free

Use it forMechanical, electrical, IT, janitor and storage rooms.

PDQ seriesXGTGTGPSDSFSXSVMR

Entrance

Cylindrical 116 · F109Mortise MR116 · F04

Outside Locked by the inside button (toggle on mortise). Key unlocks.

Inside Always free

Use it forSuite entries and offices that lock during the day.

PDQ seriesXGTGTGPSDSFSXSVMR

Office / Entry

Cylindrical 182 · F82Mortise MR181

Outside Locked by the inside button. Key or the inside lever unlocks.

Inside Always free

Use it forPrivate offices.

PDQ seriesXGTGTGPSDMR

Classroom

Cylindrical 148 · F84Mortise MR148

Outside Locked and unlocked by key from the outside only.

Inside Always free

Use it forLabs, workrooms and offices locked at the end of the day.

PDQ seriesXGTGTGPSDSXSVMR

Classroom Security

Cylindrical 135, 145, 135LED · F110Mortise MR157 (F34) is the closest mortise option

Outside Locked by key from inside or outside.

Inside Always free

Use it forK-12 classrooms. Teachers lock the door without stepping into the hall.

PDQ seriesXGTGT

Institution

Cylindrical 128 · F87Mortise MR138 · F30

Outside Always rigid. Key opens it.

Inside Always rigid. Key opens it.

Use it forInstitutional rooms where codes allow key-only exit.

PDQ seriesXGTGTMR

Choose a Function by Room

Common starting points for each type of door. Your hardware consultant and local code have the final say.

Door or room	Common function	Why
Corridor, closet or meeting room that never locks	Passage (126)	No lock to manage, and nothing to get locked out of.
Single-occupant restroom or lactation room	Privacy (176), or Privacy with Indicator (MR276)	Occupant locks from inside. Staff can open it from outside in an emergency.
Mechanical, electrical, IT or janitor room	Storeroom (115)	Always locked from outside, so the door can't be left unlocked by mistake.
Private office	Office / Entry (182) or Entrance (116)	The occupant locks it with a button. A key gets in when it's locked.
K-12 classroom	Classroom Security (135, 145 or 135LED)	Locks from inside during a lockdown. 135LED confirms the outside lever is locked.
Dorm room or apartment entry	Dormitory (165, MR158) or Apartment / Corridor (MR162)	Residents lock from inside or out, and the inside lever always lets them leave.
Patient room	Hospital Privacy (175)	Patient locks from inside. Staff open it with the emergency turn piece.
Tenant or building entrance	Entrance (116), or Store Door with deadbolt (MR137)	Unlocked during business hours and locked after, with a key from either side on store door.
Door between two rooms	Communicating (141)	Each side locks its own lever, so each room controls its own side.

Egress, fire and accessibility codes vary by occupancy and jurisdiction. Confirm every function with the authority having jurisdiction.

PDQ Function Finder

Every mechanical lock function PDQ offers, with its ANSI/BHMA number and the series that carry it. Filter by lock type or search by name, number or series.

Search functions

PDQ No.	Function	ANSI/BHMA	How it works	PDQ series
126	PassageCylindrical · Non-keyed	F75	Latchbolt operated by lever from either side at all times No locking	XGT, GT, GP, SD, SF, SX, SV, TJ
176	Privacy (Bedroom/Bathroom)Cylindrical · Non-keyed	F76	Push button inside locks outside lever Emergency release outside, rotating inside lever or closing the door unlocks it Inside lever always free	XGT, GT, GP, SD, SF, SX, SV, TJ
177	Patio / PrivacyCylindrical · Non-keyed	F77	Push button inside locks outside lever Rotating inside lever or closing the door unlocks it No emergency release outside	XGT, GT
175	Hospital PrivacyCylindrical · Non-keyed	—	Push button inside locks outside lever Emergency turn piece outside, rotating inside lever or closing the door unlocks it Inside lever always free	XGT, GT
173	Time OutCylindrical · Non-keyed	—	Inside lever locks only while the outside push button is held Releasing the button returns the lock to passage Emergency release from outside	XGT, GT
124	ExitCylindrical · Non-keyed	F89	Latchbolt operated by inside lever only Outside lever always rigid	XGT, GT
125	CommunicatingCylindrical · Non-keyed	—	Latchbolt operated by lever from inside Blank, non-removable plate outside	XGT, GT, GP, SD, SV, TJ
115	StoreroomCylindrical · Keyed	F86	Outside lever always rigid Key outside retracts latchbolt Inside lever always free	XGT, GT, GP, SD, SF, SX, SV
116	EntranceCylindrical · Keyed	F109	Push button inside locks outside lever Key outside or rotating inside lever unlocks it Push and turn button for constant lock: key retracts latch but doesn't unlock outside lever	XGT, GT, GP, SD, SF, SX, SV
182	Office / EntryCylindrical · Keyed	F82	Push button inside locks outside lever Key outside or rotating inside lever unlocks it Inside lever always free	XGT, GT, GP, SD
148	ClassroomCylindrical · Keyed	F84	Key outside locks and unlocks outside lever Inside lever always free	XGT, GT, GP, SD, SX, SV
135	Classroom Security (Vestibule)Cylindrical · Keyed	F110	Key in either lever locks or unlocks outside lever Lock the room from inside without stepping into the hall Inside lever always free	XGT, GT
145	Classroom Security with Locking Direction ArrowCylindrical · Keyed	F110	Same operation as 135 Arrow shows which way to turn the key to lock	XGT, GT
135LED	Classroom Security with LED IndicatorCylindrical · Keyed	F110	Same operation as 135 Press the inside button: a red LED confirms the outside lever is locked Meets California Education Code 17075.50	XGT, GT
137	Store DoorCylindrical · Keyed	F91	Key from either side locks or unlocks both levers	XGT, GT, SV
141	CommunicatingCylindrical · Keyed	F80	Key on each side locks or unlocks its own lever independently	XGT, GT
128	InstitutionCylindrical · Keyed	F87	Both levers always rigid Key on either side retracts latchbolt Entry and exit by key only	XGT, GT
165	Dormitory / CorridorCylindrical · Keyed	F90	Key outside or push button inside locks outside lever Key outside, rotating inside lever or closing the door unlocks it Inside lever always free	XGT, GT
155	Service StationCylindrical · Keyed	F92	Push button inside locks outside lever Key outside, rotating inside lever or closing the door unlocks it Push and turn button for constant lock	XGT, GT
120	SecurityCylindrical · Keyed	—	Key outside locks and unlocks inside lever Outside lever always free Inside lever has non-removable security features	XGT, GT
129	Exit / Twin CommunicatingCylindrical · Keyed	—	Key in inside lever retracts latchbolt Inside lever always rigid, blank plate outside Minimum 1-1/2" between doors	XGT
150	Exit / Twin CommunicatingCylindrical · Keyed	—	Inside lever operates latchbolt, blank plate outside Key inside locks and unlocks inside lever Use only in rooms with more than one exit	XGT, GT
199A	Electrified StoreroomCylindrical · Electrified	—	Outside lever controlled electrically, fail safe or fail secure Key outside retracts latchbolt Inside lever always free	XGT, GT
276	Indicator (GT276)Cylindrical · Indicator	—	Indicator shows the door's locked or occupied status from outside	GT
205	Double DummyCylindrical · Dummy	—	Rigid levers both sides No latch operation	XGT, GT, GP, SV, TJ
211	Single DummyCylindrical · Dummy	—	Rigid lever one side No latch operation	XGT, GT, GP, SD, SF, SV, TJ
MR126	PassageMortise · Non-keyed	F01	Latchbolt operated by lever from either side	MR
MR176	PrivacyMortise · Non-keyed	F22	Thumbturn inside locks outside lever Emergency coin turn outside, rotating inside lever or closing the door unlocks it	MR
MR174	Privacy with Thumbturn Both SidesMortise · Non-keyed	—	Thumbturn on either side locks or unlocks outside lever Rotating inside lever or closing the door unlocks it	MR
MR178	Privacy with DeadboltMortise · Non-keyed	F02	Thumbturn inside throws deadbolt Emergency coin turn outside retracts deadbolt	MR
MR179	Privacy with Deadbolt and EgressMortise · Non-keyed	F19	Thumbturn inside throws deadbolt Inside lever retracts latch and deadbolt together Emergency coin turn outside retracts deadbolt	MR
MR115	StoreroomMortise · Keyed	F07	Outside lever always rigid Key outside retracts latchbolt Inside lever always free	MR
MR116	EntryMortise · Keyed	F04	Toggle (stopworks) locks or unlocks outside lever Key outside retracts latchbolt	MR
MR148	ClassroomMortise · Keyed	—	Key outside locks and unlocks outside lever Inside lever always free	MR
MR181	OfficeMortise · Keyed	—	Key outside or thumbturn inside locks outside lever Closing the door or rotating inside lever unlocks it	MR
MR113	Classroom Hold Back, Single CylinderMortise · Keyed	F06	Outside lever rigid, key outside retracts latch Key outside holds latch retracted when retracted by inside lever	MR
MR114	Classroom Hold Back, Double CylinderMortise · Keyed	—	Outside lever rigid, key outside retracts latch Key inside holds latch retracted	MR
MR138	InstitutionMortise · Keyed	F30	Both levers rigid Key either side retracts latchbolt	MR
MR186	Apartment EntranceMortise · Keyed	F09	Key inside locks or unlocks outside lever Key outside retracts latchbolt	MR
MR117	Front DoorMortise · With deadbolt	F08 or F10	Toggle locks outside lever, key retracts latch Key outside or thumbturn inside throws deadbolt	MR
MR135	Entrance / StoreroomMortise · With deadbolt	F21	Levers always free Key outside or thumbturn inside throws deadbolt	MR
MR136	Dormitory / ExitMortise · With deadbolt	F13	Key outside or thumbturn inside throws deadbolt Deadbolt locks latch and outside lever Inside lever retracts latch and deadbolt together	MR
MR137	Store DoorMortise · With deadbolt	F14	Levers always free Key on either side throws deadbolt	MR
MR139	Closet / StoreroomMortise · With deadbolt	—	Levers always free Key outside throws deadbolt	MR
MR141	Storeroom with DeadboltMortise · With deadbolt	—	Outside lever rigid, key retracts latch Key outside throws deadbolt Inside lever retracts latch and deadbolt together	MR
MR154	EntranceMortise · With deadbolt	F10	Toggle locks outside lever Key outside or thumbturn inside throws deadbolt Inside lever retracts latch and deadbolt together	MR
MR157	Intruder Deadbolt with DeadlatchMortise · With deadbolt	F34	Key on either side throws deadbolt Deadbolt locks latch and outside lever Inside lever retracts latch and deadbolt together	MR
MR158	DormitoryMortise · With deadbolt	F11	Toggle locks outside lever Key on either side throws deadbolt Inside lever retracts latch and deadbolt together	MR
MR159	DormitoryMortise · With deadbolt	F33	Key on either side throws deadbolt Inside lever retracts latch and deadbolt together	MR
MR162	Apartment / CorridorMortise · With deadbolt	F20	Toggle locks outside lever, key retracts latch Key outside or thumbturn inside throws deadbolt Inside lever retracts latch and deadbolt together	MR
MR128	Institution with DeadboltMortise · With deadbolt	—	Both levers rigid, key either side retracts latch Key either side throws deadbolt	MR
MR131	Single Cylinder DeadboltMortise · Deadlock	F18	Key outside throws deadbolt	MR
MR132	Cylinder and Thumbturn DeadboltMortise · Deadlock	F17	Key outside or thumbturn inside throws deadbolt	MR
MR133	Double Cylinder DeadboltMortise · Deadlock	F16	Key on either side throws deadbolt	MR
MR134	Classroom DeadboltMortise · Deadlock	F29	Key outside throws deadbolt Inside cylinder retracts but doesn't extend deadbolt	MR
MR232	Privacy Deadbolt with IndicatorMortise · Indicator	—	Thumbturn inside throws deadbolt Outside indicator shows VACANT or OCCUPIED	MR
MR236	Dormitory / Exit with IndicatorMortise · Indicator	F13	Same operation as MR136 Outside indicator shows LOCKED or UNLOCKED	MR
MR241	Storeroom with Deadbolt with IndicatorMortise · Indicator	—	Same operation as MR141 Outside indicator shows LOCKED or UNLOCKED	MR
MR257	Intruder Deadbolt with IndicatorMortise · Indicator	F34	Same operation as MR157 Inside indicator shows LOCKED or UNLOCKED	MR
MR259	Dormitory with IndicatorMortise · Indicator	F33	Key on either side throws deadbolt Inside lever retracts latch and deadbolt together Inside indicator shows VACANT or OCCUPIED	MR
MR260	Faculty Restroom with Deadbolt and IndicatorMortise · Indicator	F15	Key outside or thumbturn inside throws deadbolt Inside lever always free for egress Outside indicator shows VACANT or OCCUPIED	MR
MR269	Privacy with IndicatorMortise · Indicator	—	Key outside or thumbturn inside throws deadbolt Outside indicator shows VACANT or OCCUPIED	MR
MR276	Privacy with IndicatorMortise · Indicator	F22	Same operation as MR176 Outside indicator shows VACANT or OCCUPIED	MR
MR278	Privacy with Deadbolt and IndicatorMortise · Indicator	F02	Same operation as MR178 Outside indicator shows VACANT or OCCUPIED	MR
MR279	Privacy with Deadbolt, Egress and IndicatorMortise · Indicator	F19	Same operation as MR179 Outside indicator shows VACANT or OCCUPIED	MR
MR199A	Electrified StoreroomMortise · Electrified	—	Outside lever controlled electrically, fail safe or fail secure Key outside retracts latchbolt Inside lever always free	MR
MR200	Electrified InstitutionMortise · Electrified	—	Both levers controlled electrically, fail safe or fail secure Key either side retracts latchbolt	MR
MR213 / MR214 / MR215	Deadbolt with Dummy TrimMortise · Dummy	—	Rigid outside lever, rotating inside lever retracts deadbolt 213: cylinder and thumbturn, 214: double cylinder, 215: single cylinder	MR
MR205 / MR211	Double and Single DummyMortise · Dummy	—	Rigid levers, no latch operation Also available with chassis (MR206, MR212) or active trim (MR207)	MR
116	Entrance (single cylinder)Deadbolt · Deadbolt	E1151 / E2152	Key outside or thumbturn inside locks and unlocks	KM, KT, KV
137	Store Door (double cylinder)Deadbolt · Deadbolt	E1141 / E2142	Key on either side locks and unlocks	KM, KT, KV
148	ClassroomDeadbolt · Deadbolt	E1171	Key outside locks and unlocks	KM, KT
125	Communicating (thumbturn only)Deadbolt · Deadbolt	E1112 / E2192	Thumbturn inside only Blank outside	KT, KV
125 IND	Privacy Deadbolt with IndicatorDeadbolt · Deadbolt	—	Thumbturn inside locks and unlocks Indicator shows status	KV
MJ131	Mortise Deadbolt, Single CylinderDeadbolt · Mortise deadbolt	—	Key outside throws deadbolt	MJ
MJ132	Mortise Deadbolt with ThumbturnDeadbolt · Mortise deadbolt	—	Key outside or thumbturn inside throws deadbolt	MJ
MJ133	Mortise Deadbolt, Double CylinderDeadbolt · Mortise deadbolt	—	Key on either side throws deadbolt	MJ
MJ134	Mortise Deadbolt, ClassroomDeadbolt · Mortise deadbolt	—	Key outside throws deadbolt Handed (RH or LH)	MJ
CL126	Entry, Single CylinderInterconnected · Interconnected	F95	Both levers always free Key outside or turnpiece inside throws deadbolt Turning inside lever retracts deadbolt and latch together	CL
CL116	Entry, Double CylinderInterconnected · Interconnected	F97	Turn button inside locks outside lever Key outside or turnpiece inside throws deadbolt Turning inside lever retracts deadbolt and latch together	CL
CL115	Storeroom, Double CylinderInterconnected · Interconnected	F98	Key outside throws deadbolt Inside lever or key outside retracts deadbolt and latch	CL
CL148	Classroom with Deadbolt IndicatorInterconnected · Interconnected	—	Key outside locks or unlocks outside lever Thumbturn inside throws deadbolt, indicator outside Inside lever retracts deadbolt and latch together	CL
CL176	Privacy with Deadbolt IndicatorInterconnected · Interconnected	—	Thumbturn inside throws deadbolt, indicator outside Emergency key outside retracts deadbolt Inside lever retracts deadbolt and latch together	CL

Function descriptions are summarized from the PDQ Price Book. Check the price book or the product submittal sheet for options, handing and availability by finish.

Get the Full Function Charts

The PDQ Price Book shows every function with a diagram, full description and ordering details for each series. Architectural submittal sheets list the functions available for each product.

Download the PDQ Price Book

Every PDQ function with diagrams and descriptions, plus how to order each series.

Download the Price Book (PDF)

PDQ cylindrical lock in cycle testing at the PDQ test lab

How to Specify a Lock Function

Map who uses each door. Note who needs to lock it, who needs to get in when it's locked, and who needs to get out.
Check the code first. Egress, fire and accessibility rules come before convenience, and some states set their own classroom lock requirements.
Pick the lock type and grade. Choose cylindrical, mortise or interconnected, and ANSI/BHMA Grade 1 or 2 for the traffic the door sees.
Write both numbers on the schedule. List the ANSI/BHMA function and the PDQ function number, for example Storeroom, F86, PDQ XGT115.
Confirm with your PDQ rep. Your rep can check availability by series, finish, lever and cylinder before you submit.

Find Your Local Rep Contact PDQ

Lock Function FAQs

What is a lock function?

A lock function is how a lock behaves: which side can lock it, what locks it (a key, push button, thumbturn or toggle), and whether the inside lever always lets people out. Each function has a PDQ number and an ANSI/BHMA number. For example, a storeroom function on a cylindrical lock is PDQ 115 and ANSI/BHMA F86.

What is the difference between a storeroom and a classroom function?

A storeroom lock (F86) is always locked from the outside, and only a key opens it. A classroom lock (F84) can be left unlocked, and a key from the outside locks or unlocks the outside lever. On both, the inside lever always lets people out.

What is the difference between classroom (F84) and classroom security (F110)?

A classroom function (F84) locks only with a key from the hallway side. A classroom security function (F110) locks with a key from either side, so a teacher can lock the door from inside the room during a lockdown. PDQ's XGT and GT 135, 145 and 135LED are classroom security functions.

Which lock function should I use for an office?

Most offices use Office/Entry (F82, PDQ 182) or Entrance (F109, PDQ 116). The occupant locks the outside lever with an inside push button, and a key opens it. Entrance adds a push-and-turn setting that keeps the outside lever locked even after someone uses a key.

Which lock function should I use for a single-occupant restroom?

Use a privacy function: F76 on cylindrical locks or F22 on mortise locks. The occupant locks it with an inside button or thumbturn, and staff can open it from outside with the emergency release. For a visible occupied sign, choose a privacy function with an indicator, such as PDQ MR276.

Are PDQ function numbers the same across lock types?

Most PDQ cylindrical series share numbers, so 115 is a storeroom on XGT, GT, GP, SD, SF, SX and SV. Mortise functions carry an MR prefix and don't always match: MR135 is an entrance/storeroom deadbolt function, while 135 on XGT and GT is classroom security. Check the ANSI/BHMA number to be sure.

Where can I find full details for every PDQ function?

The PDQ Price Book shows every function with a diagram, full description and ordering details. Each product's architectural submittal sheet lists the functions for that series. Both are on the PDQ Downloads page.

Not Sure Which Function to Specify?

Tell us about the opening and we'll connect you with your local PDQ rep.