Schlage B660 Single Cylinder Deadbolt

The Schlage B660 is the flagship Grade 1 single cylinder deadbolt in the B600 Series, built for commercial, institutional, and high-security applications where residential-grade hardware will not pass spec. The deadbolt throws and retracts by key outside and thumbturn inside, is non-handed for any door swing, and arrives factory-assembled for straightforward installation. It sits in Schlage Grade 1, B600 Series under Schlage Cylindrical Deadbolts within Cylindrical Deadbolts and DeadBolts under Commercial Locks.

What is the Schlage B660 and how is it different from the B60N?

The B60N is a residential-grade entry deadbolt rated to lighter cycle and strength standards, typically spec'd for homes and light commercial applications. The B660 is a different class of product entirely: ANSI A156.5 Grade 1 certified, UL10B listed as an auxiliary lock for A label single doors (4x8), with a 1" deadbolt carrying a saw-resistant hardened steel insert, a kick-in resistant strike with two 3" screws and a steel reinforcer, and wrought brass or bronze trim throughout. If a commercial spec sheet calls out Grade 1 or ANSI A156.5, the B60N does not qualify. The B660 does. If you need the Grade 2 version of this bolt, see the B560.

What makes the Schlage B660 a Grade 1 commercial deadbolt?

Grade 1 per ANSI A156.5 sets minimum requirements for cycle count, bolt throw, and forced-entry resistance. The B660's 1" throw with hardened steel insert resists sawing. The included strike is reinforced with a steel plate and secured by two 3" screws that anchor into the door frame stud, not just the jamb, to resist kick-in attacks. UL10B listing qualifies the B660 as an auxiliary lock on UL A label fire-rated single doors up to 4 hours x 8 feet. That certification combination is what separates the B600 Series from every residential deadbolt Schlage makes.

What is the difference between the B660, B661, B662, B663, and B664?

All five sit in the B600 Series Grade 1 family. The B660 is the standard single cylinder: key outside, thumbturn inside. The B661 adds an exterior trim plate for enhanced frame reinforcement. The B662 is double cylinder: key required on both sides, no thumbturn. The B663 is the classroom deadbolt: outside key only, inside always locked. The B664 is cylinder only, one-sided. The B680 is thumbturn only with no outside cylinder. Spec the correct function upfront; none are field-convertible between configurations.

What cylinder and keyway options are available for the Schlage B660?

Conventional cylinder with Schlage C keyway comes standard: 6-pin, two nickel silver keys. Keyway upgrades available: E keyway, Everest C123, and Everest C145. The Everest keyways are Schlage's high-security patented options offering key-duplication control and cut restriction; these are the configurations typically referenced in specifications as the B660P. Interchangeable core options: Small Format IC (BD, less core) and Large Format IC (J, less cylinder). Keying options: standard, keyed alike (KA), master keyed (MK), grand master keyed, and construction keying. Cylinder assemblies are removable for rekeying without pulling the lock body from the door.

Finishes, backset, and door thickness for the Schlage B660

Nine finishes: 605 Bright Brass, 606 Satin Brass, 609 Antique Brass, 612 Satin Bronze, 613 Oil Rubbed Bronze, 619 Satin Nickel, 625 Bright Chrome, 626 Satin Chrome (standard), 643E Aged Bronze. Backset: 2-3/4" standard, 2-3/8" optional. Door thickness: 1-3/4" to 2" standard. Front: 1-1/8" x 2-1/4" square corner beveled, in brass, bronze, or stainless steel. Trim: wrought brass, bronze, or stainless steel. Warranty: 3-year limited.

Specifications

SKU: B660. Function: Single Cylinder Deadbolt (ANSI E2151). Bolt: 1" throw, hardened steel saw-resistant insert. Certification: ANSI A156.5 Grade 1. Fire rating: UL10B, A label single doors 4x8. Handing: Non-handed. Backset: 2-3/4" standard. Strike: 1-1/4" x 2-3/4" with steel reinforcer, two 3" screws. Cylinder: 6-pin Schlage C keyway standard. Trim: Wrought brass, bronze, or stainless steel. Warranty: 3-year limited.