The Schlage B663 classroom deadbolt is a Grade 1 B-Series deadbolt designed specifically for classroom and institutional applications where outside entry must be key-controlled while inside egress remains accessible at all times. If you are looking for B663 replacement parts, trying to understand the difference between the B663 and B563, or deciding between the B663P, B763P, and B863P cylinder options, this guide covers all of it.

All B663 replacement parts are available at SecurityParts.com through the Schlage B-Series parts catalog. Browse the complete Schlage commercial hardware parts catalog for the full range of B-Series components.

What Is the Schlage B663 Classroom Deadbolt

The Schlage B663 is a classroom deadbolt in the B600 series. Its ANSI function designation is E0171 (or E0172 for the double-cylinder variant). In plain language: a key from outside throws or retracts the deadbolt. The inside thumbturn retracts the bolt only, it cannot throw the deadbolt from inside. When the deadbolt is fully thrown, it automatically deadlocks, meaning the bolt cannot be pushed back without the key or the inside thumbturn.

This function is why the B663 is the standard specification for classrooms, healthcare exam rooms, and institutional spaces where an authorized person with a key controls outside entry, but anyone inside can exit freely at any time by turning the thumbturn. It is not a lockout deadbolt in the sense of trapping people inside, inside egress is always free through the thumbturn.

The B663 belongs to the B600 series, which is the heavy-duty Grade 1 tier within the Schlage B-Series deadbolt family. For context on how the B600 series fits within the full Schlage B-Series deadbolt lineup, see the Schlage B-Series deadbolt parts guide at SecurityParts.com.

ANSI Function E0171: What It Means in the Field

Every Schlage B-Series deadbolt carries an ANSI function code that precisely describes how the lock operates. The B663 carries ANSI function E0171. Understanding this code prevents specification errors when replacing or ordering locks.

ANSI E0171 Behavior

• Outside: Key retracts or throws the deadbolt. Key is required for outside entry, the outside rose is a fixed trim, not a handle
• Inside: Thumbturn retracts the bolt only. Inside occupants can always exit freely
• Deadlocking: When the deadbolt is fully thrown, it automatically deadlocks. The bolt cannot be pushed back with a credit card or shimmed. The key or thumbturn is required to retract it
• Emergency access: The outside cylinder provides the only outside entry. An emergency release key (not included with the lock, ordered separately) can be used by authorized personnel if needed

ANSI E0172: The Double-Cylinder Variant

The B663 is also available in ANSI function E0172, which replaces the inside thumbturn with a second key cylinder on the inside. This configuration is used in applications where inside egress must also be key-controlled. E0172 installations require careful compliance review, as NFPA 101 and many local building codes restrict or prohibit double-cylinder deadbolts on egress doors. Confirm local code requirements before specifying E0172 on any door in an egress path. For fire door hardware compliance context, see the commercial door fire rating guide.

For most classroom applications, E0171 (single cylinder outside, thumbturn inside) is the correct and code-compliant specification. For a broader reference on ANSI/BHMA hardware grading and function codes, see the ANSI/BHMA door hardware standards guide.

Schlage B663 vs B563: What Is the Difference

The B563 and B663 both carry classroom deadbolt function (E0171/E0172) and look nearly identical from the outside. They are different generations of the same function and share some but not all replacement parts. Understanding the difference prevents ordering the wrong components.

Schlage B302-045 Rose and Turn, Classroom, used in the B563 (500-series) classroom deadbolt. The B663 (600-series) uses a different rose and turn assembly (12-618). These two components are not interchangeable. Both B563 and B663 parts are available through the Schlage B-Series parts catalog at SecurityParts.com.

B563: 500-Series Classroom Deadbolt

The B563 is the 500-series version of the classroom deadbolt. It uses an older rose and turn assembly (part B302-045) and an older-style cylinder housing (part B302-043). The B563 cylinder housing is a conventional design. The B563 cylinder options are: 22-003 for conventional 6-pin, with IC cylinder options available separately. The outside rose and trim ring design differs from the B663.

B663: 600-Series Classroom Deadbolt

The B663 is the current 600-series classroom deadbolt. It uses the 12-618 rose and turn classroom assembly, a different and updated cylinder housing (B610-025), and a different deadbolt assembly (12-631). The B663's bolt uses a 1-inch throw with a sintered steel construction and concealed hardened anti-saw pin insert. The trim, cylinder housing, and deadbolt components from the B563 and B663 are not interchangeable.

Practical Identification

When identifying which series is installed, the fastest method is reading the model designation stamped on the lock. On the B663, look for "B663P" (conventional), "B763P" (Primus), or "B863P" (Primus High Security) on the cylinder or on the lock label inside the door. The B563 is marked "B563P," "B763P," or "B863P" in its own format. The mounting hole pattern also differs, the B600 series uses a different door preparation than the B500 series in some configurations.

For a detailed parts diagram and labeled component breakdown of Schlage deadbolt series, see the Schlage deadbolt diagram guide.

Schlage B663 Cylinder Options: B663P, B763P, and B863P

The B663 classroom deadbolt is available with three cylinder security levels. The cylinder security level determines how resistant the lock is to picking, bumping, and key duplication, not how the lock functions. All three variants operate identically in the field (ANSI function E0171). Only the cylinder changes.

B663P: Conventional 6-Pin Cylinder

The standard B663. Cylinder part number 22-644. Uses a conventional 6-pin cylinder with the Schlage keyway. Available for master keying, construction keying, and standard key-alike or key-different configurations. Appropriate for most commercial and institutional applications where the Schlage key system is already in use. This is the most commonly specified B663 variant.

B763P: Primus Cylinder

The B663 with a Primus cylinder (part number 20-744). The Primus cylinder adds a secondary locking bar in the cylinder body that provides additional resistance to picking and cylinder manipulation. Key control is restricted, Primus keys cannot be duplicated at standard hardware stores and require authorization through the Schlage Primus key control system. Specified for higher-security institutional environments where key control is a documented requirement.

B863P: Primus XP High Security Cylinder

The B663 with a Primus High Security cylinder (part number 20-544). This is the highest security cylinder option in the B663 family. The Primus XP cylinder is ANSI/BHMA Grade 1 certified with additional security attributes beyond the standard Primus. Key control is strictly restricted. Specified for government facilities, financial institutions, and high-security educational environments where the most stringent key control is required.

FSIC and SFIC Options

The B663 is also available with FSIC (Full Size Interchangeable Core) and SFIC (Small Format Interchangeable Core) cylinder formats for facilities using interchangeable core key systems. These allow the cylinder to be rekeyed or swapped without special tools or disassembly of the lock body. FSIC cylinders fit in the same housing as the conventional B663P cylinder. SFIC requires a different door preparation and has specific door thickness requirements (1-3/8 to 2 inches versus 1-5/8 to 2-1/2 for conventional). For guidance on Schlage key systems including Primus, IC, and master keying, see the Schlage key systems guide.

Schlage B663 Physical Specifications

The following specifications apply to the standard B663 classroom deadbolt as confirmed from the B-Series product catalog available at SecurityParts.com.

• ANSI Function: E0171 (single cylinder outside, thumbturn inside) or E0172 (double cylinder)
• ANSI/BHMA Grade: Grade 1 (A156.29 certified)
• Deadbolt throw: 1 inch
• Deadbolt material: Solid sintered steel with concealed hardened anti-saw pin insert
• Backset: Adjustable 2-3/8 inch or 2-3/4 inch (60 mm or 70 mm); fixed backset options available
• Door thickness (conventional cylinder): 1-5/8 inch to 2-1/2 inch (41 mm to 64 mm)
• Door thickness (SFIC cylinder): 1-3/8 inch to 2 inch (35 mm to 51 mm)
• Faceplate: 1-1/8 inch x 2-1/4 inch, square corner standard; circular drive-in option available
• Strike: 1-1/8 inch x 2-3/4 inch square corner standard; options available
• Dust box: Metal with three 3-inch screws (included)
• Handing: Non-handed
• Cylinder housing: Solid zinc, outside; part B610-025
• Thumbturn and rose: Pressure cast zinc, plated or powder coated to match finish
• Cylinder format: Conventional 6-pin (B663P), FSIC, SFIC, Primus (B763P), Primus XP High Security (B863P)
• Key system: Everest 29 S123 keyway (standard); open and restricted keyway families available
• Finishes available: 605, 606, 609, 612, 613, 619, 622, 625, 626, 626AM (antimicrobial), 643e

For finish code cross-reference and matching guidance across Schlage hardware, see the commercial door hardware finish guide.

Schlage B663 Parts: What Each Component Does

The B663 classroom deadbolt is serviced through the B-Series parts catalog. All replacement parts are accessible through the Schlage B-Series parts page at SecurityParts.com. Part numbers listed below are from the official B663/763/863 parts list. Where a dedicated product page exists on SecurityParts.com, the link is provided. Where no dedicated page exists, the part number is provided as plain text for reference when ordering through the B-Series catalog or by calling 845-935-0301.

Primary Operating Components

Rose and Turn Classroom Assembly (12-618): The outside rose and turn assembly unique to the B663/763/863. This is the escutcheon plate visible on the outside of the door with the key cylinder mounted through it. The rose and turn is the primary outside trim component. Part 12-618 is specific to the B663 series and is not interchangeable with the B563's B302-043/B302-045 rose assembly.

Deadbolt with Screws (12-631): The 1-inch sintered steel deadbolt with concealed hardened anti-saw pin insert. Replaces when the bolt shows wear, corrosion, or damage that affects smooth throw and retraction. The B663 deadbolt (12-631) is not the same part as the B560/B563 deadbolt.

Cylinder Housing Outside (B610-025): The outside cylinder housing that holds the cylinder in the door preparation. Replaces when the housing is damaged or when the cylinder retaining mechanism fails.

Cylinder Retainer Screw (B520-298): The screw that secures the cylinder in the housing. Frequently lost during cylinder replacement. Always have spares on hand when servicing B663 cylinders in quantity.

Cylinder Options

The B663 uses three cylinder part numbers depending on the security level ordered:

• 22-644: Standard 6-pin conventional cylinder for the B663P
• 20-744: Primus 6-pin cylinder for the B763P
• 20-544: Primus XP High Security 6-pin cylinder for the B863P

When replacing a cylinder, always confirm the existing cylinder format (conventional, Primus, Primus XP, FSIC, or SFIC) before ordering. Swapping cylinder formats may require changes to the cylinder housing and collar components. For cylinder compatibility guidance and Schlage key system support, see the Schlage key systems guide.

Trim and Hardware Components

Strike with Screws (10-094): The standard square corner strike plate included with the B663. Installs in the door frame and receives the thrown deadbolt.

Dust Box, Metal (10-112): The metal dust box that mounts in the frame behind the strike. Included with the B663. Anchored with three 3-inch screws for security reinforcement at the frame.

Trim Ring with Shield (B520-649): The trim ring that mounts around the outside cylinder housing. Provides a finished appearance and conceals the door preparation edges around the cylinder.

Schlage B520-649 Trim Ring with Shield. An outside trim component of the Schlage B663 classroom deadbolt that mounts around the cylinder housing, concealing the door preparation edges and providing a finished appearance. In stock at SecurityParts.com.

Trim Ring 1/8 inch (36-066): Spacer trim ring for indicator function only. Used when the B663 is ordered with the occupancy indicator option.

Security Insert 1/8 inch (36-068): Security spacer for indicator function only. Used with indicator configurations on the 2-1/8 inch bore option.

Security Shield (B600-017): The security shield used with the 2-1/8 inch door prep option. Reinforces the door face around the cylinder bore.

Mounting Plate for Rose and Turn (B600-018): The mounting plate that supports the rose and turn assembly. Provides the structural connection between the outside trim and the door.

Spin Ring (B600-070): The anti-friction spin ring that allows the trim ring to rotate freely without binding against the door surface during operation.

UL Fire Cup (B520-657): The fire cup included when the B663 is ordered with fire rating. Installs inside the cylinder bore to provide the UL fire listing for the assembly. This component is not sold separately, it is only available with the fire-rated lock as ordered. Replacement of the fire cup alone does not restore a UL fire listing if the original was damaged or removed. For fire door hardware guidance, see the commercial door fire rating guide.

Fasteners

B600-066: 6-32 x 1/4-inch mounting screw (also available in screw pack B610-250)

B600-100: 1/4-28 x 1-15/16-inch mounting screw (also available in screw pack B610-250)

C603-897: 8 x 3/4-inch deadbolt and strike screw

R525-256: 3-inch metal dust box screws

B520-298: Cylinder retainer screw

All screw packs and individual fasteners for the B663 are available through the Schlage B-Series parts catalog at SecurityParts.com.

Schlage B600-018 Mounting Plate for Rose and Turn. Provides the structural connection between the B663 outside trim assembly and the door. Available through the Schlage B-Series parts catalog at SecurityParts.com.

The Indicator Function Option on the Schlage B663

The B663 is available with an occupancy indicator option that shows the room status through a small window in the outside rose. When the deadbolt is thrown (room occupied and locked), the indicator window shows red or a visible signal. When the deadbolt is retracted, the window shows clear or green.

This option is commonly specified for single-occupancy restrooms, private offices, and healthcare exam rooms where a visual signal prevents interruptions. The indicator function requires the 2-1/8-inch door bore (wider than the standard B663 bore) and uses additional trim parts including the 36-066 trim ring, 36-068 security insert, and indicator-specific screws.

The indicator trim (part 47722496), indicator fire cup (part 47807069 for fire-rated applications), and fire cup disk (part 47779637) are designated in the official B663 parts manual but are not sold separately. If the indicator components need replacement on a fire-rated B663 indicator installation, contact SecurityParts.com at 845-935-0301 for current availability before ordering.

Schlage B663 Fire Rating

The B663 classroom deadbolt is available in a fire-rated configuration. The fire-rated version includes the UL fire cup (B520-657) installed in the cylinder bore during the original manufacturing. The UL fire cup is what gives the assembled lock its fire rating listing, it is not an add-on to a standard B663.

There are two critical field implications of this:

First, if you are replacing a fire-rated B663 with a standard non-fire-rated unit, the replacement must also be fire-rated for the assembly to remain compliant. A standard B663 cylinder installed in a fire-rated door opening where a fire-rated B663 was previously specified does not maintain the opening's UL fire listing.

Second, the UL fire cup is not sold separately. If an existing fire-rated B663 has been serviced and the fire cup was lost or damaged, the lock assembly itself must be replaced with a new fire-rated unit to restore the listing. This is not a parts repair situation, it requires a new fire-rated lock.

Always confirm the fire rating status of the existing installation before ordering a B663 replacement. For a complete guide to fire-rated commercial door hardware requirements, see the commercial door fire rating guide. For the case for OEM replacement parts on fire-rated assemblies, see the OEM vs aftermarket commercial door hardware guide.

Ordering Schlage B663 Replacement Parts Without a Return

Five pieces of information prevent the most common ordering errors on B663 parts.

Schlage 10-094 Flat Square Corner Strike with Metal Box. The standard strike included with the Schlage B663 classroom deadbolt. OEM replacement available through the B-Series parts catalog at SecurityParts.com.

1. Confirm the Series: B563 or B663

Read the model designation on the lock before ordering any operational components. B563 (500-series) and B663 (600-series) use different rose and turn assemblies, cylinder housings, and deadbolts. The parts are not interchangeable.

2. Confirm the Cylinder Format

Conventional (B663P), Primus (B763P), Primus XP (B863P), FSIC, or SFIC. Ordering the wrong cylinder format results in a cylinder that does not fit the housing or is incompatible with the existing key system.

3. Confirm the Door Bore

Standard B663 parts fit the standard bore. If the lock was ordered with the indicator function, the door has the wider 2-1/8-inch bore and uses indicator-specific trim components. Standard trim parts do not fit the indicator bore correctly.

4. Confirm the Fire Rating Status

Fire-rated and non-fire-rated B663 units are not interchangeable. The fire cup is integral to the fire-rated unit. Confirm whether the existing installation is fire-rated before ordering any replacement lock or cylinder.

5. Confirm the Backset

The B663 adjusts between 2-3/8 inch and 2-3/4 inch backset, but fixed backset options exist. Confirm the current backset before ordering a replacement deadbolt or housing, as some fixed-backset variants use different components than the standard adjustable unit.

Call 845-935-0301 before ordering if any of these details are unclear. SecurityParts.com pre-order support can confirm the correct B663 parts for your specific installation before the order ships.

Where to Find Schlage B663 Parts at SecurityParts.com

All B663 replacement parts are accessible through the Schlage B-Series parts catalog at SecurityParts.com. The B-Series catalog organizes components by part type, deadbolt parts, cylinder components, trim assembly parts, strikes, and fasteners, and is the correct starting point for identifying any B663 service component.

For the broader Schlage deadbolt parts reference including component diagrams and labeled illustrations, see the deadbolt parts guide and the Schlage deadbolt diagram. For cylindrical lock parts context and how deadbolts fit within the broader Schlage commercial hardware lineup, see the cylindrical lock parts guide.

Browse the complete commercial cylindrical locks and deadbolt parts catalog and the full commercial door hardware parts catalog at SecurityParts.com. For parts identification and pre-order support, call 845-935-0301 or visit the contact page.

Why Choose SecurityParts.com for Schlage B663 Parts

SecurityParts.com has supplied OEM Schlage commercial hardware parts since 2001. Every B663 replacement component is genuine Schlage OEM, not aftermarket or rebranded substitutes.

Schlage B-Series commercial deadbolt parts at SecurityParts.com. OEM replacement components for the full B-Series lineup including B663, B563, B660, B662, and B664 models. Same-day shipping on stocked parts from US warehouses.

OEM Parts Only

Non-OEM deadbolt components on a fire-rated B663 installation can void the UL fire listing. OEM replacement parts maintain Grade 1 certification and ensure the lock assembly performs to the original specification.

Pre-Order Configuration Support

Identifying whether a lock is B563 or B663, or confirming the cylinder format before ordering, prevents the most common B663 parts return situations. SecurityParts.com provides pre-order support by phone at 845-935-0301 for exactly these situations.

Same-Day Shipping on Stocked Parts

Stocked B-Series components ship same day from US warehouses. For facility maintenance and repair situations where a classroom or institutional door is out of service, same-day dispatch minimizes the downtime window.

Browse all Schlage B-Series parts including B663 classroom deadbolt components at SecurityParts.com. For the complete Schlage hardware range including B-Series, L-Series, ND Series, and ALX Series, browse the Schlage commercial hardware catalog.

About the Author

This guide is published by the commercial door hardware team at SecurityParts.com, a supplier of OEM Schlage, Von Duprin, LCN, Falcon, and Detex parts since 2001. Technical information in this guide is sourced from the Schlage B-Series Service Manual, the Schlage B600/700/800 Series Cut Sheet, and the Schlage B-Series Commercial Grade Deadbolts Catalog. For Schlage B663 parts identification and same-day shipping availability, call 845-935-0301 or visit SecurityParts.com.