Don-Jo SP-135 Cylindrical Lock Scar Plate | Backset Conversion & Surface Repair

The Don-Jo SP-135 Cylindrical Lock Scar Plate is a dual-purpose hardware solution designed for both aesthetic restoration and functional hardware adaptation. This 3-1/2" scar plate is specifically engineered to assist in converting a 2-3/8" backset to a 2-3/4" backset. When moving a lockset further from the door edge, the SP-135 effectively covers the exposed portion of the original 2-1/8" bore hole, providing a clean, finished appearance without the need for a new door.

Beyond backset adjustments, these plates serve as an excellent solution for door surface repair, concealing "scarring," finish discoloration, or "ghosting" left behind by oversized legacy lock roses. It is an essential component for commercial door retrofitting in offices, apartments, and retail spaces.

Key Features & Performance

• Backset Conversion Support: The primary solution for 2-3/8" to 2-3/4" backset transitions, allowing you to relocate your lockset while maintaining a professional, covered door face.
  
• Oversized Coverage: With a 3-1/2" overall diameter, this plate is significantly larger than standard lock roses, ensuring it hides any unsightly damage or previous mounting marks.
  
• Precision Inner Bore: Features a standard 2-1/8" inside diameter, allowing it to fit perfectly around the chassis of most commercial cylindrical levers and deadbolts.
  
• Architectural Finishes: Available in US32D Satin Stainless Steel for a modern look or DU Duronodic (Dark Bronze) to match oil-rubbed or anodized hardware.
  
• Symmetrical Restoration: Designed to be used as one plate per side of the door to provide a uniform, factory-finished look on both the interior and exterior.
  

Technical Details & Specifications

• Brand: Don-Jo
• Model Number: SP-135
• Overall Diameter: 3-1/2"
• Inside Diameter: 2-1/8"
• Material: Durable Stainless Steel or Steel
• Available Finishes: US32D (Satin Stainless Steel) / DU (Duronodic Powder Coat)
  
• Installation: Sandwiches between the door surface and the lockset rose. For high-traffic areas, the lockset's own thru bolts secure the plate firmly in place, preventing shifting or vibration.

Why Choose the Don-Jo SP-135?

The Don-Jo SP-135 is the professional's choice for "saving" a door during a hardware upgrade. Correcting a backset error or hiding years of finish wear can be difficult; this cylindrical lock scar plate provides an immediate, industrial-strength fix. It is a cost-effective commercial door restoration tool that ensures your new hardware looks intentional and high-end. Whether you are dealing with a mismatched backset or simply want to refresh the look of a worn door, the SP-135 delivers a permanent, architectural-grade result.

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