The Schlage C203-312 is the OEM A Series Torx screw pack for the Schlage AL Series cylindrical lock latch and ANSI strike installation. The pack contains two C503-766 T-15 Torx screws for the latch faceplate mounting and two L583-371 T-20 Torx screws for the ANSI strike mounting, along with the appropriate T-15 and T-20 installation tools. Finish must be specified at time of order to match the installed hardware finish. The Torx screws are furnished in the specified finish so the screw heads blend with the latch faceplate and strike plate on the door and frame.

Per the Allegion Knowledge Base, the C203-312 is also used on the Schlage B250 and B252 deadbolt for optional Torx latch and strike mounting. The AL Series service manual lists the C203-312 under "Screw Packs, Torx" as the standard Torx upgrade option for latch and strike mounting across the A Series product family.

Why Torx Screws Instead of Standard Fasteners on Schlage Hardware

The AL Series and B Series hardware both ship with standard combo-head screws (C603-897) as the default for latch and strike mounting. The C203-312 replaces those when Torx drive is specified or needed on the job.

The practical case for switching is straightforward. Standard Phillips screws came out -once torque gets high enough, the driver climbs up and out of the head and you're left with a partially stripped screw that's hard to remove later. Torx doesn't do that. The six-lobe profile keeps the bit fully seated throughout the full torque range, so you get a clean, consistent drive every time without destroying the head.

The tamper angle matters too. Nobody's removing Torx screws with a flathead or a Phillips. That's not a high-security claim -it's just a practical reality that the average opportunistic vandal or unauthorized person isn't carrying a T-15 or T-20 bit. On high-traffic institutional doors, that matters.

For contractors running multi-door projects, the consistency benefit adds up. Same bit, same torque feel, same seating depth across every latch and strike installation on the job. With Phillips, you're constantly adjusting for screw heads that are sitting at slightly different depths depending on how the previous screw drove. Torx standardizes that.

Schlage C203-312 vs C203-311: Two Torx Packs Explained

The Schlage AL Series service manual lists two Torx screw packs with similar applications. The C203-311 contains four C503-766 T-15 Torx screws -all the same size, for both the latch and the standard strike. The C203-312 (this product) contains two C503-766 T-15 screws for the latch and two L583-371 T-20 screws for the ANSI strike.

The distinction matters because the latch faceplate screws and the ANSI strike screws are different sizes and use different Torx bit sizes. The ANSI strike is the larger, heavier component that mounts in the door frame and takes a deeper, more robust screw -the T-20 L583-371 provides greater shear resistance for the frame-side mounting. The latch faceplate screws mount through a thinner latch face into the door edge and use the smaller T-15.

The C203-311 (four T-15 screws) is for the smaller standard strike -not the full ANSI lip strike. The C203-312 is specified when a full ANSI curved-lip strike requires T-20 fasteners at the frame. Both packs include the matching installation tools per the service manual note: "Torx screw packs are furnished with appropriate T-xx installation tool(s)."

Schlage Deadbolt and A Series Applications

The C203-312 applies across the Schlage AL Series and into the B Series deadbolt family. The B250 and B252 deadbolts use the same latch and ANSI strike screw positions as the A Series, and the Allegion KB confirms the C203-312 covers those applications as well. Facilities running Schlage AL Series cylindrical locks and B250/B252 deadbolts can stock the C203-312 as the single Torx screw pack for both product lines.