B20 series

B20 mortise lock Intruder Security Lock

PRODUCT / B20 series

B20 Mortise Lock - Intruder Security Lock

The B20 Intruder Security Latch is a compact mortise lock designed for applications requiring controlled lever operation in a space-saving design. It features a single latch bolt, an exterior key cylinder, and an interior thumb turn.

The latch bolt is operated by the lever from either side of the door. The exterior key or interior thumb turn can lock or unlock both levers, providing controlled access while maintaining convenient door operation.

Category: Mortise Lock
FUNCTION: Intruder Security Lock

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01 / OVERVIEW

Overview

The B20 features a small mortise lock case with a single latch bolt and no deadbolt. Its compact construction makes it suitable for doors where installation space is limited but controlled access is required.

Both levers operate the latch bolt when unlocked. Turning the exterior key or interior thumb turn locks or unlocks both levers, allowing the lock to switch between controlled and free lever operation.

Designed for commercial and institutional applications, the B20 combines a compact lock body with a practical locking function for doors requiring intruder security.

02 / FEATURE

Feature

Compact Mortise Design:

Small lock case provides a space-saving locking solution for doors with limited installation space.

Single Latch Bolt:

Features a single beveled latch bolt for straightforward door latching without a separate deadbolt.

Keyed Entry:

Exterior cylinder allows authorized users to lock or unlock both levers with a key.

Controlled Lever Function:

The key or thumb turn locks or unlocks both levers, allowing controlled access through the door.

Durable Construction:

Designed for reliable operation and long-term durability in demanding applications.

Space-Efficient Installation:

Compact dimensions make it suitable for door designs where a full-size mortise lock case is not required.

Versatile Applications:

Suitable for commercial and institutional doors requiring controlled lever operation and a compact mortise locking mechanism.

Flexible Door Integration:

Designed for integration with compatible lever handles, cylinders, and door hardware, subject to door preparation and installation requirements.

03 / FUNCTION

Function

Picture	Model no.	Function	Description	Lever	Cylinder	Thumb turn	Emergency turn
	B20	Intruder Security Lock	Latch bolt operated by lever from either side. Key or thumb turn lock or unlock both levers.	✓	✓	✓

04 / SPECIFICATION

Specification

Door preparation	ANSI/BHMA A156.115W or A156.115
Door thickness	For doors 1-3/4" (44mm) to 2-1/4" (57mm) thick standard
Stile	4-1/2" (114mm) minimum stile
Backset	2-3/4" (70mm)
CTC	Cylinder to lever distance 2-31/32" (75mm)
Lock case	SS304, thickness 3/32" (2.5mm)
Latch bolt	SS303 cast, A156.13 Grade 1 latch bolt projection 3/4" (19mm)
Hub	FN-0208 Sintered Steel /Zamak 2
Face plate	SS304, 6-13/16"×1-3/16"×1/16" (172.5×31×2mm)
Cylinder	Φ1-1/8" cylinder, C28000 brass, 6 pin, 3 keys, satin nickel face
Strike	SS304, 4-7/8" ANSI curved lip strike, thickness 5/64" (2mm)
Strike box	PA66
Hand	Field reversible latch bolt
Finishes	US32D
ANSI/BHMA	ANSI/BHMA A156.13 certified Grade 1
UL listed	UL/cUL 10C listed for 3 hour fire rating