Schlage Commercial 33-137 6-Pin Classic Standard Plug, Modular Cylinders, Plugs - Key-In-Knob/Lever

Plug only. The 33-137 is the keyed barrel that the key enters and that turns inside a Schlage modular key-in-knob or lever cylinder, sold as a replacement part rather than a full lock or a complete cylinder assembly. If you need the whole cylinder body, this is not it; order the plug when you are rekeying, changing keyway, or replacing a worn or damaged plug in a cylinder you already have.

Four keyways are built: C, E, EF and G, all Schlage Classic. The keyway has to match the keys already cut for the building, because the plug is the part the key blade enters, and a blade from the wrong keyway will not go in. C is the most widely used Schlage Classic keyway and is the usual answer on standard, non-restricted key systems; E, EF and G are typically there because a facility is already sectioned that way for master keying or to keep buildings separate. Check the letter stamped on your existing key or on the plug you are pulling before you pick.

No. The 33-137 is a Classic plug, offered in the C, E, EF and G keyways. Everest is a separate Schlage keyway family with its own blanks, and it does not interchange with Classic. If the keys on the doors are Everest, this plug will not take them and you need an Everest plug in the matching Everest section instead. Worth confirming before you order for an occupied building, since Classic and Everest locks often sit side by side in properties that were expanded or re-hardwared at different times.

That is the point of the 33-137. On Schlage's modular cylinders the keyed plug comes out as a separate replacement part, so a re-key or a keyway change is done at the plug and the knobs, levers and cylinder housings stay on the doors. For a building-wide change, order one plug per opening in a single keyway so every door ends up on the same system, and keep the finish consistent with the trim already installed. This is commercial-grade hardware, not residential.