Door Lockset

UL ANSI Grade 2 Fireproof Zinc Alloy Knob Lock - Model DDLK012

1. Product Overview

The DDLK012 UL ANSI Grade 2 Fireproof Zinc Alloy Knob Lock by D&D HARDWARE is a high-performance door lockset engineered for superior security, durability, and fire resistance in residential and commercial spaces. As an ANSI Grade 2 certified solution, it exceeds 400,000 usage cycles and passes UL 3-hour fire tests, making it ideal for entryways requiring robust protection. Crafted with zinc alloy construction and stainless steel components, this door knob lock integrates seamlessly with D&D’s door hardware ecosystem (including door hinges, door closers, and door accessories), delivering both safety and aesthetic appeal.

2. UL ANSI Grade 2 Fireproof Zinc Alloy Knob Lock - Technical Specifications

• Model Number: DDLK012
• Brand: D&D HARDWARE
• Door Thickness Compatibility: 1-3/8"–2" (standard residential and commercial doors)
• Backset: 2-3/4" (standard), 2-3/8" (optional)
• Door Prep: Cross bore 2-1/8", Edge bore 1", Latch face 1-1/8"x2-1/4"
• Cylinder: 5-Pin or 6-Pin removable core, Schlage "C" keyway (enhanced security)
• Face Plate: 1-1/8"x2-1/4" square corner (standard)
• Strike: 2-1/4" full lip square corner (standard)
• Bolt: 1/2" throw, stainless steel (anti-pry, durable)
• Rosette: Removable interior/exterior rosette via screw thread (easy installation/maintenance)
• Certifications: ANSI Grade 2, UL Listed (3-hour fire resistance)

3. UL ANSI Grade 2 Fireproof Zinc Alloy Knob Lock - Product Images and Videos

4. UL ANSI Grade 2 Fireproof Zinc Alloy Knob Lock - Product Features & Advantages

• ANSI Grade 2 Certification: Exceeds 400,000 usage cycles, ensuring durability for high-traffic residential and commercial entrances.
• UL 3-Hour Fire Resistance: Tested to withstand fire for up to 3 hours, providing critical safety in emergency situations.
• Zinc Alloy & Stainless Steel Construction: Zinc alloy knob for corrosion resistance; stainless steel bolt for anti-pry security and long-term performance.
• Removable Core Cylinder: 5-Pin/6-Pin Schlage "C" keyway cylinder allows easy rekeying, enhancing access control flexibility.
• Versatile Door Compatibility: Fits 1-3/8"–2" thick doors with adjustable backset (2-3/4" / 2-3/8"), suitable for homes, offices, and public buildings.
• Easy Installation & Maintenance: Removable rosettes via screw thread simplify installation and future servicing.
• Seamless D&D Hardware Integration: Works with door hinges, door closers, door stops, and door accessories to create a unified door hardware system.

5. UL ANSI Grade 2 Fireproof Zinc Alloy Knob Lock - Installation Steps

1. Prepare Door & Tools: Ensure door thickness is 1-3/8"–2". Gather a screwdriver, drill, and measuring tape.
2. Drill Door Prep Holes: Create cross bore (2-1/8"), edge bore (1"), and align with latch face (1-1/8"x2-1/4").
3. Install Latch Assembly: Insert the stainless steel latch into the edge bore, align the face plate with the door edge, and secure with screws.
4. Attach Knob & Rosette: Position the zinc alloy knob and removable rosette over the cross bore, then secure via screw thread.
5. Install Strike Plate: Align the 2-1/4" full lip strike plate on the door frame with the latch bolt, and secure with screws.
6. Test Operation & Integration: Verify smooth knob turning, latch engagement, and compatibility with door hinges or door closers (if installed).

6. UL ANSI Grade 2 Fireproof Zinc Alloy Knob Lock - Application Scenarios

The DDLK012 Fireproof Knob Lock excels in environments requiring high security, fire resistance, and durability, including:

In residential entryways, it provides ANSI Grade 2 security and fire protection, integrating with door closers for smooth operation. For commercial offices, its durable zinc alloy construction withstands high traffic, pairing with door hinges and door stops. In healthcare facilities, UL fire resistance ensures safety during emergencies, while easy rekeying (via removable core cylinder) simplifies access management.

7. UL ANSI Grade 2 Fireproof Zinc Alloy Knob Lock - Value for Buyers

• Enhanced Safety & Compliance: ANSI Grade 2 and UL fire resistance meet strict industry standards, ensuring protection and code compliance for properties.
• Long-Term Durability: Zinc alloy and stainless steel components resist wear, corrosion, and forced entry—reducing maintenance/replacement costs.
• Systematic Procurement: Integrates with D&D’s door locks, door hinges, door closers, and accessories, enabling buyers to source cohesive door hardware from one supplier—streamlining logistics.
• Design Versatility: Zinc alloy construction allows diverse finishes (customizable) to match any architectural style, enhancing property aesthetics.
• Easy Installation & Maintenance: Removable rosettes and core cylinder simplify installation, servicing, and rekeying—saving time for contractors and facility managers.

8. UL ANSI Grade 2 Fireproof Zinc Alloy Knob Lock - Certifications and Compliance

The DDLK012 Knob Lock meets rigorous industry standards for security, durability, and fire safety:

• ANSI Grade 2 Certification: Validates performance exceeding 400,000 usage cycles for heavy-duty applications.
• UL Listing: Passes 3-hour fire resistance tests, ensuring safety in fire emergencies.
• ISO 9001 Quality System: Produced in D&D’s ISO 9001-certified factory, with strict quality control from material sourcing to final testing.

9. UL ANSI Grade 2 Fireproof Zinc Alloy Knob Lock - Customization Options

D&D offers OEM/ODM customization for the DDLK012 knob lock to meet project-specific needs:

• Finish Customization: Add custom finishes (e.g., polished chrome, oil-rubbed bronze) to match door handle and architectural aesthetics.
• Cylinder Customization: Opt for master key systems or unique keyway configurations for enhanced access control in multi-unit properties.
• Material Upgrades: Choose high-grade zinc alloy or stainless steel variants for extreme environments (e.g., coastal areas, industrial facilities).
• Branding: Incorporate custom logos or engravings on knobs/rosettes for property developers or brand-specific projects.

10. UL ANSI Grade 2 Fireproof Zinc Alloy Knob Lock - Production Process & Quality Control

1. Material Sourcing: Procure high-quality zinc alloy and stainless steel, tested for corrosion resistance and mechanical strength.
2. Precision Machining: Use CNC machining to shape knobs, rosettes, cylinders, and latch components—ensuring dimensional accuracy for ANSI/UL compliance.
3. Finishing & Coating: Apply selected finishes with strict adhesion testing to ensure durability and aesthetic consistency.
4. Assembly: Integrate the knob, rosette, cylinder, and latch mechanism, testing for smooth operation and secure locking functionality.
5. Quality Inspection: Each lock undergoes functional testing (usage cycles, fire resistance simulation) and visual checks for defects—critical for ANSI Grade 2/UL compliance.
6. Certification Testing: Random samples are tested against ANSI, UL, and BHMA standards to verify performance in security and fire scenarios.
7. Packaging: Pack in protective white/color boxes or custom cartons to prevent damage during shipping, with clear labeling for easy identification in logistics.