The ANSI Grade 1 UL Cylindrical Lever Lockset is positioned as a premium commercial-grade locking solution engineered for maximum security, durability, and fire safety compliance. Constructed from high-quality stainless steel, it delivers excellent strength, corrosion resistance, and long-term reliability in demanding environments. Certified to ANSI Grade 1 standards, it meets the highest performance level for heavy-duty commercial use, while its UL listing with a 3-hour fire rating ensures dependable performance in fire-rated door assemblies. Designed for smooth lever operation and consistent latch engagement, this cylindrical lockset is ideal for commercial entry doors, office buildings, hospitals, schools, hotels, and other high-traffic facilities where security, code compliance, and long service life are essential.
Technical Specifications
Model Number
DDLK009
Certifications
ANSI Grade 1, UL Listed (3 Hours Fire Rating)
Door Prep
Cross bore 2-1/8", Edge bore 1", Latch face 1-1/8"×2-1/4"
Backset
2-3/4" standard; 2-3/8" optional
Face Plates
1-1/8"×2-1/4" square corner (standard)
Door Thickness
1-3/8" – 2" (standard)
Cylinder
6-Pin removable core, Schlage "C" keyway
Strikes
ASA strike standard, 2-1/4" full lip square corner
Bolt
1/2" throw, stainless steel
Product Images and Videos
Product Features & Advantages
ANSI Grade 1 Rating: The DDLK009 cylindrical lever lockset is engineered to meet ANSI Grade 1, the highest performance classification for cylindrical locksets. This rating verifies its ability to withstand heavy-duty usage in high-traffic environments such as office buildings, hospitals, schools, and multi-family residences. Tested for strength, cycle durability, and impact resistance, the lockset is designed to endure frequent daily operation without compromising security or mechanical stability. For contractors and facility managers, this ensures long-term reliability and reduced maintenance or replacement frequency.
UL Listed (3 Hours Fire Rating): UL listed with a 3-hour fire rating, this lockset maintains structural integrity during fire exposure, supporting life-safety requirements in critical buildings. It is suitable for fire-rated doors in hospitals, educational institutions, commercial offices, and public facilities where strict compliance with fire codes is mandatory. The fire rating ensures that the latch mechanism remains functional under extreme heat conditions, helping to compartmentalize fire and protect safe egress routes.
6-Pin Removable Core with Schlage "C" Keyway: Equipped with a 6-pin removable core compatible with the Schlage “C” keyway, the lockset simplifies rekeying and access control management. Facility managers can quickly change cores without removing the entire lock body, minimizing downtime and labor costs. This feature is particularly beneficial for multi-tenant properties, office buildings, or hospitality environments where access permissions frequently change.
Stainless Steel Bolt (1/2" Throw): The stainless steel latch bolt with a 1/2" throw provides strong resistance against forced entry while maintaining corrosion resistance in humid or exterior-adjacent conditions. Stainless steel construction ensures consistent performance even in high-moisture environments, reducing the risk of rust-related malfunction. The precise bolt projection enhances secure engagement with the strike plate for dependable daily operation.
Passage Function: The passage function allows free lever operation from both sides without requiring a key, making it ideal for high-access interior doors such as corridors, lobbies, meeting rooms, and shared spaces. This function supports convenience and operational efficiency while maintaining the robust mechanical strength expected from an ANSI Grade 1 device.
Installation Steps
Prepare Door & Tools: Confirm the door preparation matches specifications: 2-1/8" cross bore, 1" edge bore, and door thickness between 1-3/8" and 2". Gather required tools such as a drill, screwdriver, and measuring tape. Proper preparation ensures smooth installation and accurate alignment.
Install Latch Assembly: Insert the latch assembly into the edge bore, aligning the face plate flush with the door edge. Secure it firmly with screws, ensuring the latch bolt extends and retracts smoothly without friction or obstruction.
Position Lockset Body: Insert the cylindrical lock body into the cross bore, aligning it precisely with the latch assembly. Adjust the lever orientation according to the door swing direction to guarantee ergonomic operation and correct functionality.
Secure Lockset & Strike: Tighten mounting screws evenly to secure the lockset to the door. Install the ASA strike plate on the door jamb, carefully aligning it with the latch bolt to ensure full engagement and proper door closure.
Install Cylinder (if applicable): Insert the 6-pin removable core into the lock body, confirming compatibility with the Schlage “C” keyway. Test key insertion and rotation to verify smooth locking and unlocking performance.
Test Operation: Operate the lever and key multiple times to confirm proper engagement, smooth passage function, and accurate strike alignment. If integrated with door closers or panic devices, verify synchronized performance.
Application Scenarios
The DDLK009 lockset is designed for environments demanding superior durability, fire compliance, and operational efficiency.
In office buildings, it provides dependable security while supporting high employee traffic throughout the day. In hotels and hospitality venues, it delivers reliable guest room and common-area functionality while maintaining aesthetic consistency with door handles and architectural finishes.
For hospitals and healthcare facilities, the UL fire rating and heavy-duty construction meet life-safety requirements while ensuring long-term durability in demanding environments. In schools and educational institutions, its Grade 1 strength withstands constant use, supporting both security and accessibility.
In residential buildings such as condominiums and apartments, it offers a balance of durability and convenience, especially in shared spaces. For commercial entrances including malls and retail stores, the robust stainless steel latch and Grade 1 rating ensure dependable performance under continuous public use.
Certifications and Compliance
The DDLK009 Lockset meets rigorous industry standards, ensuring reliability and market acceptance:
ANSI Grade 1: Validated to meet the highest ANSI performance grade for cylindrical locksets, ensuring durability, strength, and reliability under heavy usage conditions.
UL Listed (3 Hours Fire Rating): UL listed for fire resistance, confirming its ability to maintain operational integrity during fire exposure in critical buildings.
ISO 9001 Quality System: Manufactured under D&D’s ISO 9001-certified quality management system, guaranteeing consistent production standards and rigorous quality oversight.
Customization Options
D&D HARDWARE offers OEM/ODM customization for the DDLK009 lockset to meet project-specific needs:
Backset Customization: Available in 2-3/4" standard or 2-3/8" backset options to accommodate varying door preparations.
Keyway Customization: Keyway compatibility can be modified beyond the Schlage “C” configuration to integrate with existing master key systems.
Finish Customization: Custom finishes such as polished brass, matte black, or satin nickel can be specified to align with project design themes and door hardware aesthetics.
Branding & Packaging: Custom logos, engravings, and branded packaging options are available to support private-label distribution or project-based requirements.
Production Process & Quality Control
Material Sourcing: High-strength alloys and stainless steel components are carefully selected and tested for mechanical performance and corrosion resistance.
Precision Machining: CNC machining ensures tight dimensional tolerances for lock bodies, latch assemblies, and cylinders, supporting ANSI-compliant operation.
Assembly: Each lockset is assembled with precision, integrating the 6-pin core, lever mechanism, and stainless steel bolt to guarantee smooth and reliable performance.
Quality Inspection: Every unit undergoes functional testing, dimensional verification, and visual inspection to confirm performance and finish quality.
Certification Testing: Random batch samples are subjected to ANSI Grade 1 and UL fire performance verification to maintain consistent compliance.
Packaging: Products are packed in protective white, color, or custom cartons to prevent shipping damage, with clear labeling to support efficient distribution and project management.
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