Overview

The Ningbo Dimon Commercial Stainless Steel Fire Door Lock Set is a heavy-duty, fire-rated architectural mortise lockset engineered for emergency egress doors, commercial stairwells, corridor fire doors, hospital passageways, and public facility access routes. Crafted from heavy-gauge stainless steel (available in grade 304 or 201) and cold-rolled steel, this heavy-duty hardware set combines a precision reversible latch bolt, anti-saw solid deadbolt, and code-compliant return-to-door safety lever handles designed to prevent snagging clothing or equipment during evacuation. Engineered to withstand high operating duty cycles and fire door latching requirements, it delivers uncompromising security, fire compartmentalization, and smooth mechanical operation.

Key Features

• Fire-Rated Commercial Security: Heavy-duty mortise construction keeps fire-rated steel and solid wood doors securely latched during emergency fire events, preventing the spread of smoke and heat.
• Quick-Reversible Latch Bolt: Non-handed universal design allows the beveled stainless steel latch bolt to be quickly reversed in seconds using a screwdriver without opening the internal lock case, accommodating both Left-Hand and Right-Hand swinging doors.
• Anti-Saw Solid Steel Deadbolt: Robust rectangular stainless steel deadbolt projects fully into the door frame strike to resist forced entry, prying, and hacksawing.
• Return-to-Door Safety Levers: Ergonomic commercial U-shaped safety lever handles feature a rounded return toward the door face, complying with commercial accessibility and anti-snag fire egress standards.
• High-Torque Solid Spindle: Reinforced heavy-duty square spindle and spring-assisted rosette chassis prevent handle sagging, looseness, or mechanical fracture even under high-traffic daily use.
• Complete Commercial Hardware Package: Includes mortise lock body, pair of stainless steel lever handles, round rose escutcheons, cylinder/thumbturn, strike plate, and all mounting fasteners.

Technical Specifications

• Product Type: Commercial Fire Exit Mortise Lockset
• Faceplate & Trim Material: Grade 304 Stainless Steel (Grade 201 optional)
• Lock Case Material: Heavy-Gauge Zinc-Plated Galvanized Steel
• Latch Type: Field-Reversible Beveled Latch Bolt with Anti-Friction Guide
• Deadbolt Type: Solid Rectangular Anti-Saw Deadbolt
• Handle Type: Commercial Round-Bar Safety Return Lever (U-Shaped)
• Door Compatibility: Fire-rated hollow metal doors, solid wood commercial doors, steel security passage doors
• Compatible Door Thickness: 40 mm – 55 mm (approx. 1-1/2" to 2-1/8")
• Included Accessories: Mortise lock case, pair of lever handles, rose covers, cylinder escutcheons, strike plate, spindle, and installation screws

Wholesale & OEM Capabilities

• Material Grades & Finishes: Available in AISI 304 for exterior/corrosive environments or grade 201 for standard interior projects; Brushed Satin Stainless Steel or Electrostatic Matte Black PVD.
• Master Keying & Cylinder Matching: Compatible with standard Euro profile cylinders, construction master keying (MK), and thumbturn privacy turn pieces.
• Project Sizing & Backsets: Standard European 72mm and 85mm center-to-center configurations available upon request.
• Export Contractor Packaging: Individually boxed with multi-step installation templates and heavy-duty corrugated export master cartons.
• Direct B2B Supply: Factory-direct wholesale pricing from Ningbo Dimon, strict quality inspection, flexible MOQs, and reliable global container/LCL shipping.