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Schlage B660 Grade 1 Cylinder x Thumbturn Deadbolt

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List Price: $281.00
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Schlage B660 Grade 1 Cylinder x Thumbturn Deadbolt

Function: Deadbolt thrown or retracted by key outside or thumbturn inside.

Strong and Secure:

  • Solid sintered steel bolt with hardened steel anti-saw pin is thicker than most Grade 1 deadbolt offerings
  • Metal dustbox anchors deep to reinforce wood door frames with three 3" screws to protect against kick-in attacks
  • Free spinning, broadly angled cylinder collar resists wrenching and prying
  • Removeable security shield protects bolt from ice-pick attack through the door
  • Hardened steel ball-bearings protect mounting bolts from drill attack (Torx screw packs also available)
  • Fixed backset strengthens lock against tampering (adjustable option available)
  • UL 437 listed option resists drilling and physical attack on the cylinder (B800 only)
  • UL 10C 3-hour fire rated as auxiliary locks


  • ANSI/BHMA A156.5 Grade 1 certified with Conventional cylinder (FSIC is Grade 2; SFIC is Grade 3)
  • UL 10C listed, 3-hour fire rated as auxiliary locks for A label single doors, 4' x 8'
  • UL 10B listed for neutral pressure doors
  • UL 437 listed (B800 Series only)
  • ADA compliant thumbturn design
  • BAA (Buy American Act) compliant product
More Information
  • Deadbolt: 1" housing diameter; 0.875" x 0.62" x 1" throw; sintered steel with hardened steel anti-saw pin insert (drive-in options available)
  • Faceplate: 1 1/8" x 2 1/4" with square corners 
  • Strike: 1 1/8" x 2 3/4" with square corners (ANSI, round corner and thimble strike options available)
  • Backset: Adjustable 2 3/8" or 2 3/4"
  • Door range: 1 5/8"- 2" Conventional and FSIC; 1 3/4"- 2" SFIC; 1 3/8"- 2 1/2" door bolt only
  • Reinforcement: Metal dust box reinforcer with three 3" screws
  • Trim ring: 7/8" solid brass or bronze
  • Cylinder: 6-pin solid brass, keyed 6-pin, S123 keyway, keyed different (KD)
  • Keys: Two nickel silver cut keys per lock
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