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How to Read a Schlage Deadbolt Diagram

A Schlage deadbolt parts diagram shows the lock in an exploded view, with each component pulled apart from the others and numbered or labeled. The exploded view reveals how components nest together when assembled. The two sides of the diagram represent the outside of the door (the key cylinder side) and the inside of the door (the thumb turn side), connected through the door by the housing and the bolt assembly.

The strike assembly shown in the diagram is separate from the lock body and mounts into the door frame rather than the door itself. When ordering replacement parts, components from the door-side diagram are different products from the strike-side components, so identifying which side the failed part belongs to is always the first step.

The Outside Components: Key Cylinder Side

1. The Key Cylinder (Cylinder Plug and Shell)

The cylinder is the outermost component in the Schlage deadbolt diagram on the exterior side of the door. It consists of two main parts shown in the diagram: the cylinder plug (the rotating inner section that the key engages) and the cylinder shell (the outer housing that does not rotate). Inside the plug, the diagram shows a series of pin chambers running perpendicular to the plug face. Each chamber holds a key pin at the bottom and a driver pin above it, separated by the shear line when the correct key is inserted.

In a Schlage B Series single-cylinder deadbolt (B60N, B500, B600), there is one cylinder on the exterior side only. In a double-cylinder deadbolt (B62N, B502, B602), the diagram shows a cylinder on both the exterior and interior sides, replacing the thumb turn shown on single-cylinder models.

2. The Tailpiece (Cylinder Tailpiece)

The tailpiece is the rectangular or tab-shaped metal extension projecting from the back of the cylinder plug. It is the mechanical link between the rotating cylinder and the bolt mechanism inside the housing. When the key turns the cylinder plug, the plug rotates the tailpiece, and the tailpiece pushes against the cam inside the housing to extend or retract the bolt. This component is visible in the Schlage deadbolt diagram as the piece connecting the cylinder body to the housing assembly behind it.

Tailpiece failures produce a specific symptom: the key turns freely but the bolt does not move. This indicates the tailpiece has broken, deformed, or disengaged from the cam it drives. Browse Schlage deadbolt tailpiece replacement parts at SecurityParts.com.

3. The Outside Rose or Escutcheon

The rose (on standard B Series models) or escutcheon (on trim-specific variants) is the mounting plate visible on the outside face of the door surrounding the cylinder. On the Schlage B60N and B600 Series, this is a circular rose plate that covers the face bore and provides a finished appearance. The rose is held by mounting screws that pass through the door from the inside trim plate, so the rose itself has no external screws that can be removed from outside the door. This design prevents a simple external attack from defeating the trim mounting.

4. The Outside Mounting Plate and Through-Bolts

Behind the outside rose in the diagram are the mounting bolts that pass through the door from the inside trim to hold the entire outer trim assembly. On the B600 Series Grade 1 models, these are hardened machine screws. The diagram shows their path through the door edge and into the interior trim mounting holes. Loose or missing through-bolts produce a wobbling or spinning outer rose and are the most common reason the exterior trim feels loose even when the bolt mechanism is intact.

The Central Assembly: Bolt, Housing, and Faceplate

5. The Deadbolt (Bolt Throw)

The deadbolt itself is the horizontally moving steel bar shown in the center of the diagram, extending from the door edge into the strike box when the lock is in the locked position. On Grade 1 Schlage B Series models (B250, B500, B600 Series), the bolt has a 1-inch throw, meaning it extends one inch beyond the door edge when fully locked. On Grade 2 models (B350, B352), the throw is 5/8 inch.

The bolt face is square-cornered in the Schlage B Series, not beveled. A beveled latch is a spring latch that closes automatically; a square-cornered deadbolt requires deliberate key or thumb turn operation to extend or retract. This distinction is important when reading the diagram: the square face bolt shown is the deadbolt, not the spring latch used in cylindrical locks.

6. The Anti-Saw Pin (Hardened Steel Insert)

The Schlage deadbolt diagram for B600 Series Grade 1 models shows a small pin or cylinder of hardened steel embedded within the bolt body. This is the anti-saw pin. Its function is to defeat a forced entry technique where the attacker saws through the bolt by pressing a hacksaw blade between the door edge and the strike while the bolt is engaged. When the saw blade contacts the anti-saw pin, the pin spins freely inside the bolt body, preventing the blade from making sustained contact and cutting through. Grade 2 models (B350 Series) do not include the anti-saw pin, which is one of the key differences visible between Grade 1 and Grade 2 bolt assemblies in the diagram.

7. The Bolt Housing and Retainer

The bolt housing is the metal case inside the door body that encases the bolt mechanism, the cam assembly, and the tailpiece connection. In the exploded diagram, the housing appears as the central body of the lock into which the cylinder tailpiece enters from one side and the thumb turn cam enters from the other. The housing is secured to the door face by the faceplate screws.

A retainer clip or retaining ring shown in the diagram holds the bolt within the housing so it moves in a straight linear path without rotating. A failed retainer clip causes the bolt to rotate instead of traveling straight, which prevents it from seating correctly in the strike box.

8. The Faceplate and Mortise Pocket

The faceplate is the flat metal plate visible on the door edge when looking at the door from the side. It covers the opening of the mortise pocket cut into the door edge and has two countersunk screw holes that secure the housing to the door. On the B500 and B600 Series, the faceplate is square-corner 1-1/8 inch by 2-1/4 inch. The backset (the horizontal distance from the door edge to the center of the face bore) is adjustable on all Schlage B Series deadbolts between 2-3/8 inches and 2-3/4 inches.

The Inside Components: Thumb Turn Side

9. The Thumb Turn

The thumb turn is the knob or lever on the interior face of the door that operates the deadbolt from inside without a key. It connects to a cam inside the housing through a spindle or through-bolt arrangement. Turning the thumb turn 90 degrees rotates the cam, which drives the bolt to the extended or retracted position. In the Schlage B Series diagram, the thumb turn is shown with its cam engagement visible in the exploded view, separate from the thumb turn knob itself.

Thumb turn failures are usually one of two types: the thumb turn spins freely without moving the bolt (broken cam engagement or stripped spindle connection) or the thumb turn is difficult to operate (bent bolt from door-slam damage or misalignment between the bolt and the strike). Identifying which failure type is occurring points directly to which component in the diagram needs replacement.

10. The Inside Rose or Escutcheon

The inside rose mirrors the outside rose in appearance but mounts the interior thumb turn and holds the through-bolts that secure the entire assembly to the door. On B600 Series models, the inside trim includes a more substantial mounting plate behind the rose that anchors the lock body against forced entry attempts from the outside. Removing the inside rose gives access to the through-bolt heads, which allows the entire lock assembly to be removed from the door for service or replacement.

The Strike Assembly: Frame-Side Components

11. The Strike Plate and Strike Box

The strike plate and strike box are shown in the Schlage deadbolt diagram as a separate assembly that mounts into the door frame rather than the door itself. The strike plate is the visible metal plate on the door frame face with a rectangular opening through which the bolt passes. The strike box is the recessed metal box behind the strike plate that receives the full 1-inch bolt throw when the door is locked.

The strike box is a critical security component that most residential installations omit. Without a strike box, the bolt passes through the strike plate opening into wood only. A kick-in attack splits the wood and the bolt pulls through. With a strike box, the bolt enters a metal pocket that distributes the force of a kick-in attack across the full depth of the box, which is substantially more resistant to forced entry. Grade 1 B600 Series installations should always use the provided strike box, not the strike plate alone.

12. Strike Box Reinforcement Screws

The diagram for the B500 and B600 Series strike plate shows two types of screws: standard installation screws (which only penetrate the door jamb) and optional 2-inch reinforcement screws (Schlage part J250-028) that penetrate past the jamb and into the structural framing behind it. The standard screws provide adequate performance for normal use. The 2-inch reinforcement screws dramatically increase the resistance of the strike assembly to kick-in forced entry by anchoring the strike into structural wood rather than just the jamb material. Browse Schlage strike plate and reinforcement parts at SecurityParts.com.

Grade 1 vs Grade 2: What the Diagram Shows Is Different

Using the Diagram to Identify the Failed Part

When something goes wrong with a Schlage deadbolt, the symptom usually points directly to a specific numbered component in the diagram. Use this symptom-to-component mapping to identify the right part before ordering.

• Key turns, bolt does not moveTailpiece broken or disengaged from cam. Check tailpiece first before replacing cylinder.
• Key stiff or hard to turnCylinder plug pins worn or corroded. Lubricate with dry graphite first; replace cylinder if stiffness persists.
• Thumb turn spins freelyCam inside housing stripped or thumb turn spindle broken. Requires housing or cam replacement.
• Bolt extends but will not retractBolt is bent from door-slam impact or misaligned with strike. Check alignment before replacing bolt assembly.
• Bolt will not fully extendStrike box misaligned or door has shifted. Confirm the strike box centerline aligns with the bolt centerline before ordering any parts.
• Outside rose spins or wobblesThrough-bolts loose or missing. Tighten through-bolts from inside trim before diagnosing further.
• Door can be kicked in despite locked boltStrike box missing or strike screws too short. Install strike box and 2-inch reinforcement screws.

Single Cylinder vs Double Cylinder: Diagram Differences

The most common version of the Schlage B Series deadbolt diagram is the single-cylinder configuration (B60N, B500, B600) where the inside shows a thumb turn and the outside shows a key cylinder. The double-cylinder version (B62N, B502, B602) replaces the thumb turn with a second key cylinder on the interior side.

The diagram difference is significant for parts ordering. A single-cylinder deadbolt uses a thumb turn assembly, a cam, and one cylinder. A double-cylinder deadbolt uses two cylinders, two tailpieces, and no thumb turn or cam assembly. When ordering a replacement cylinder for a double-cylinder installation, both cylinders must be specified to maintain a keyed-alike configuration if both sides share the same key.

The Adjustable Backset: What It Means for Replacement Parts

Every Schlage B Series deadbolt diagram shows a two-position backset adjustment. The standard backset positions are 2-3/8 inches and 2-3/4 inches, measured from the door edge to the center of the face bore hole. Most commercial door hardware installations use the 2-3/4 inch backset because it is compatible with the wider door stile dimensions common in commercial hollow metal frames. Residential entry doors often use the 2-3/8 inch position.

The backset setting does not change which bolt, housing, or cylinder you need. It changes where the strike plate is positioned on the door frame. A Schlage deadbolt moved from a 2-3/8 inch backset door to a 2-3/4 inch backset door needs the strike plate repositioned but uses the same lock body. Confirming the backset before ordering the strike plate prevents ordering a strike that puts the bolt pocket in the wrong position.

Model Number Reference: B Series Diagram Variants

The Schlage B Series includes several model lines, and the diagram varies slightly between them. Knowing which series is installed before consulting the diagram prevents confusion between models that look similar but use different parts.

The B60N is the most common single-cylinder deadbolt in the residential and light commercial B600 Series. The diagram shows Everest 29 S or T keyway cylinder, 1-inch bolt with anti-saw pin, and square-corner faceplate. The B62N is the double-cylinder version of the same series. The B500 Series and B600 Series are the commercial Grade 1 versions with SFIC and FSIC cylinder options visible in the diagram alongside the standard cylinder. The B250 Series (Grade 1) and B350 Series (Grade 2) are the commercial lines where the Grade difference is reflected in the bolt assembly shown in the diagram.

Browse all Schlage hardware and deadbolt parts at SecurityParts.com, or see the commercial deadbolt parts guide for model-specific identification. For cylindrical lock parts that use a spring latch rather than a deadbolt, see the Schlage cylindrical lock parts catalog. For mortise lock deadbolt assemblies used in L Series locks, see the Schlage mortise lock parts catalog.