School Security – Grade 1 Cylindrical Locks

GT Series Classroom Intruder

PDQ’s GT Series Grade 1 Cylindrical Locks offer best in class performance and value. Patented School Security Classroom Intruder Function is designed to keep staff and students safe in the event of an emergency lock down.


Proudly made in Lancaster, Pennsylvania, USA



For Doors:
  • 1-3/4” to 2-1/4” thick
  • Preset for 1-3/4” door
  • Through door thru-bolting
Door Prep:
  • Standard ANSI A156.115 (161) for Cylindrical Locks
  • 2-3/4” Standard. 3-3/4” and 5” Optional (Ordered from factory only).
  • Heavy duty zinc diecast, investment cast, chromated cold rolled steel, stainless steel and EZAC™ diecast mechanism. Billet Steel spindles for locking functions
  • 2-1/4” x 1-1/8”
  • Stainless Steel or Wrought Brass
  • Beveled 1/8” in 2”
  • ASA standard
  • T-Strike or Full Lip Strike optional
  • Stainless Steel or Wrought Brass
  • 9/16” Throw Deadlocking
  • 3/4” Latch projection for available as option.
  • Non-handed
  • Solid Zinc diecast PHL, BSN or MIA Levers
  • 41° Lever Rotation Standard with 2-3/4” backset
  • Wrought Brass Roses, Concealed Screws
  • 65° Lever Rotation Standard with 3/4” latch for double doors (Ordered from factory only) and all 3-3/4” and 5” backsets (Ordered from factory only)
  • Two (2) per Lock
  • SCC standard (Schlage C Compatible)
  • Also available in keyways of other manufacturers
Interchangeable Core:
  • Available for all keyed functions
  • 6 or 7-pin
  • Large Format IC Core available for PHL Lever ONLY.
  • Compatible with Best, Falcon and Arrow.
  • 6-pin Brass Insert Cylinder keyed to 5-pins
  • Options: MK, CMK or GMK
  • Zero Bitted (KO), Keyed Different (KD) or Keyed Alike (KA)
  • Can be keyed into existing master key systems
  • 605 )US3) Bright Brass, 613 (US10B) Oil rubbed Bronze, 619 (US15) Satin Nickel, 626 (US26D) Satin Chrome
  • Other finishes available. Contact PDQ Customer Service
  • Optional Antimicrobial Coating 626 (USD26D) only‡
Certifications, Listings Compliances:
  • UL/CUL 10C listed for 3 hrs, for single doors up to 4’0” x 8’0”
  • Certified to ANSI/BHMA A156.2-2011, Grade 1
  • California Education Code Compliant (Functions GT135, GT135LED, GT145)
  • Federal Specification FF-H-10C (Superseded by A156.2)
  • Florida Building Code HVHZ (High Velocity Hurricane Zone) listed, FL21376. Maximum design load rating: ± 70 PSF for single doors 3' x 7'.
  • Complies with ADA (Americans with Disabilities Act) and ICC/ANSI 117.1 for Accessible and Usable Buildings
  • Twenty-five (25) year Limited Warranty
Country of Origin:
  • Proudly Assembled in the U.S.A. with U.S. and foreign material. Meets requirements of the Buy American Act.

Functions – School Security

GT Series - Functions

Architectural Finishes

  • 626 (US26D) - Satin Chrome Plated, No Coating

Electronic Access Control

Fail Safe/Fail Secure Electrical Specifications:
  • Input voltage: 12-24VDC or 12-24VAC.
  • 24 Volts AC/DC +/- 10%
  • Operating Current: .150A
  • 12 Volts AC/DC +/- 10%
  • Operating Current: .250A
  • Includes rectifier for AC voltage
  • Solenoid operated

Cross Reference

GT Series - Cross Reference


• Factory tested to over 3 million cycles (3 times the ANSI/BHMA Grade 1 standard)
• Lever torque tested to over 2,100 in-lbs (3 times the ANSI/BHMA Grade 1 standard)



How to Order

GT Series - How to Order

How to Order – Electronic Access Control

GT Series - How to Order