Lawrence Hardware

LH5301, LH5322, LH5300, LH5303, LH5304, LH5305, LH5307, LH5325, LH5327, LH5328 Series Cylindrical - Knob

Grade 2 Standard Duty Commercial Knobs

5000 Series Cylindrical Grade 1 Extra Heavy Duty Knobs

  • Designed for extra heavy duty commercial, industrial and institutional applications
  • No exposed mounting screws
  • Non-handed
  • Conventional cylinder or SFIC (Small Format Interchangeable Core) 
  • SFIC cylinder sold separately


  • Knobs include steel reinforcement
  • Heat treated heavy gauge cold rolled steel spindles add strength and security
  • Internal steel mechanism is corrosion treated
  • The threaded rose assembly is adjustable for door thickness


  • ANSI/BHMA certified A156.2 Series 4000 Grade 1
  • cUL/UL Listed for all functions up to 3 hours


  • For Doors 1-3/8” to 2” (35mm to 52mm)
  • Backset 2-3/4” (70mm) standard 2-3/8” (60mm) available
  • Bore Fits 2-1/8” hole
  • Front Stainless Steel or Brass, 2-1/4” x 1-1/8” (57mm x 29mm) 
  • Strike ANSI (4-7/8” x 1-1/4”) strike standard
  • Roses 2-3/4” (70mm) Diameter Stainless steel or brass base metal
  • Handing Non-handed
  • Latchbolt Stainless steel 17/32” (13.5mm) throw standard.  3/4” (19mm) throw available
  • Cylinder Solid brass 6-pin cylinder Schlage C keyway with two keys per lock standard.   
  • IC Core Solid brass 6 or 7-pin core sold separately
  • keying Keyed Different (KD) standard.  Available Masterkeyed (MK), Keyed Alike (KA) and Construction Masterkeyed (CMK) see Keys and Keying section for additional options
  • Finishes US32D (630) knobs.  Other finishes available by special order


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Lawrence Hardware
676 Petrolia Road, Toronto, ON M3J 2V2
Business Hours

Mon - Thur: 8:30am to 5:00pm
Fri: 8:30am to 1:00pm

Mon - Thur: 7:00am to 4:00 pm
Fri: 7:00am to 1:00pm
Shipping & pickup can be arranged based on these hours.

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