Product Details
LD-383 Brass Steel Deadbolt Lock Cylinder Only Replacement ZHIFANG
LD-383 Brass and Steel Deadbolt Lock Cylinder Only Replacement from ZHIFANG brand. Single cylinder design with key outside and thumbturn inside, featuring brass 5-pin or 6-pin tumbler with SC1 or KW1 keyway, available in multiple finishes for residential and commercial door security.
Core Features
- Solid brass or steel body construction for durability
- Hardened steel bolt resists sawing and prying
- Brass 5-pin or 6-pin tumbler with nickel silver pins
- Single or double cylinder configuration options
- SC1 or KW1 keyway, 2-3 brass keys included
- 60mm or 70mm backset, fits 35-50mm door thickness
- ANSI/BHMA Grade 2 certified security performance
Application Scenarios
- Residential front and back door deadbolt replacement
- Commercial office and retail door lock upgrade
- Rental property and apartment rekeying projects
- Locksmith service call replacement parts
- Hotel and hospitality guest room security
- Educational facility and institutional buildings
FAQ
How do I know if this cylinder will fit my existing deadbolt?
The LD-383 deadbolt cylinder is designed as a standard replacement that fits most major deadbolt brands. Before ordering, measure your existing cylinder diameter (should be approximately 32mm), the backset distance from the edge of the door to the center of the cylinder (either 60mm or 70mm), and your door thickness (35-50mm). Also check your keyway type by comparing to an SC1 or KW1 key. If you are unsure, you can send us photos and measurements of your existing cylinder and our technical team will help confirm compatibility. Most standard residential deadbolts use a 60mm backset with either SC1 or KW1 keyways.
What is the difference between single cylinder and double cylinder deadbolts?
A single cylinder deadbolt has a key cylinder on the outside and a thumbturn knob on the inside. You lock and unlock it from the outside with a key and from the inside by turning the thumbturn. This is the most common type for residential use and provides quick egress in emergencies. A double cylinder deadbolt has key cylinders on both sides, requiring a key to lock or unlock from either side. Double cylinder provides higher security against intruders reaching through broken glass, but may pose an egress hazard in emergencies. Always check local building codes before installing double cylinder deadbolts, as many areas require single cylinder on egress doors for life safety.
Can I order these cylinders keyed alike for my entire building?
Yes, we offer keyed alike (KA) and master key (MK) systems for the LD-383 deadbolt cylinder. Keyed alike means all cylinders in your order use the same key, which is convenient for property managers who need to access multiple units with a single key. Master key systems provide each unit with its own unique key plus a master key that opens all units. We can also create grand master key systems for larger buildings with multiple access levels. Custom keying has a slightly longer lead time of 15-20 days and requires a minimum order quantity. Contact our sales team to discuss your specific key system requirements.
What security rating does this deadbolt cylinder have?
The LD-383 deadbolt cylinder is ANSI/BHMA Grade 2 certified, which means it has passed rigorous testing for cycle durability (over 400,000 operations), bolt strength, and forced entry resistance. Grade 2 is suitable for medium-duty commercial applications and all residential applications. The hardened steel bolt provides excellent resistance against sawing and prying attacks. The brass pin tumbler with nickel silver pins offers good pick resistance. For higher security applications such as Grade 1 commercial requirements, please ask about our upgraded cylinder options with anti-pick pins, anti-drill protection, and restricted keyways. All our deadbolt cylinders are also CE certified and manufactured under ISO 9001 quality standards.
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