DD series

DD20 mortise lock ANSI/BHMA A156.13 F20 Apartment Corridor Door Lock

DD20 mortise lock - Apartment Corridor Door Lock

PRODUCT / DD series

DD20 mortise lock - Apartment Corridor Door Lock

The DD20 apartment corridor mortise lock meets and exceeds ANSI/BHMA A156.13 standards, with Grade 1 cycle performance for heavy-duty use. It features stainless steel components for durability and corrosion resistance. As the most versatile model in the series, it offers the full range of functions and is UL listed for up to 3-hour fire-rated openings.

Category: Mortise Lock
FUNCTION: ANSI BHMA A156.13 F20 Apartment Corridor Door Lock

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01 / OVERVIEW

Overview

The DD20 Apartment Corridor Door Lock is designed in full compliance with ANSI/BHMA A156.13, meeting and exceeding industry standards for strength, durability, and operational performance. Engineered for heavy-duty use, it exceeds the cycle performance requirements of Grade 1, ensuring consistent performance in demanding, high-cycle environments.

Built with high-quality stainless steel internal components and housing, the lock ensures enhanced corrosion resistance, long-term durability, and reliable operation throughout its service life.

Available in a comprehensive range of functions—including entry, classroom, storeroom, privacy, passage, and deadlock, the DD Series provides versatile solutions for a wide range of door applications.

UL listed for up to 3-hour fire-rated openings, it meets stringent fire protection requirements for commercial and institutional use.

It is ideally suited for offices, educational facilities, healthcare environments, government buildings, banks, and other high-use or security-sensitive applications.

02 / FEATURE

Feature

Universal design

● A multifunction mortise lock body integrates 10 function models on one lock case.

● Suitable for multiple door thicknesses, wood or metal doors

● Compatible with various lever and trim types, including ADA compliance standard levers, meeting diverse application requirements.

● Compatible with indicator trim options, providing clear visual confirmation of the locked/unlocked status of a door.

● Compatible with escutcheon trim and electronic mechanisms, making it ideal for hospitality applications.

Quality

● ANSI Grade 1 mortise lock designed to meet the rigors of high-traffic applications.

● Constructed with a stainless steel lock case and internal components to enhance strength and corrosion resistance.

Flexibility

● Multi-function capability allowing 10 functions to be configured from a single lock body.

● Quick Reversible feature enables handing reversal without disassembling the lock case.

Security

● Enhanced structural design combined with high-strength materials provides vandal-resistant performance, helping prevent forced external damage and ensuring a high level of security.

03 / FUNCTION

Function

Picture	Model no.	ANSI no.	Function	Description	Lever	Cylinder	Thumb turn
	DD20	F20	Apartment Corridor Door Lock	Lever latch both sides; outside lever disable by non-key means. Deadbolt by key outside or turn inside; key operates both bolts. Inside lever retracts both; outside stays locked. Latch deadlocks when disabled or deadbolt thrown; re-enabled when deadbolt is retracted.	✓	✓	✓

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)
Lock case	SS304, thickness 3/32"
Latch bolt	SS303, A156.13 Grade 1 latch bolt projection 3/4", 2 pcs anti-friction
Auxiliary latch bolt	SS304, 3/8" projection, non-handed
Dead bolt	17-4PH stainless steel, A156.13 Grade 1 dead bolt projection 1”
Face plate	SS304, ANSI/BHMA A156.115 8" × 1-1/4" × 1/16" (203 × 31.7 × 2.1mm)
Hub	AISI4140 steel, high hardness
Cylinder	Φ1-1/8" cylinder, C28000 brass, 6 pin, 3 keys, satin nickel face
Strike	SS304, 4-7/8" ANSI curved lip strike, thickness 1/8" (3mm)
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