Schlage F Series locks have become popular with residential applications in the past years. The F Series locks are available in keyed and non-keyed configurations having both lever and knob lock options for standalone applications and integration with handlesets. The keyed F Series locks have a...
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Schlage F Series locks have become popular with residential applications in the past years. The F Series locks are available in keyed and non-keyed configurations having both lever and knob lock options for standalone applications and integration with handlesets. The keyed F Series locks have a five-pin tumbler “C” keyway lock cylinder.
To satisfy a number of requests for servicing information, I have compiled a brief history and servicing information for the keyed F Series knob and lever locks.
Using my Schlage Lock catalogs as a guide, Schlage introduced the F Series cylindrical locks in the early 1930s as “small” knob locks for residences and apartments. These locks were available keyless or with a five wafer tumbler lock operated by a single-sided utility lock type of round head key. One thousand changes were available. According to the catalog, locks could not be master keyed.
They disappeared from the Schlage Lock catalogs by the 1940s and returned as non-keyed cylindrical locks in the mid-1960s to accommodate non-keyed functions for other lock series.
Around early to mid-1980s, Schlage introduced the new F Series tubular keyed knobsets with pin tumbler lock cylinders. These residential entry knobsets, like the A and D Series, were equipped with a two-piece keyed knob. The A and D Series cylindrical knobsets during that time are manufactured to accept six-pin tumbler lock cylinders.
The five-pin tumbler lock cylinder for the F series two-piece knobset has been a zinc plug and body since it was introduced or very shortly thereafter. The zinc lock cylinder body of the F Series two-piece knob is similar in shape to the machined brass lock cylinders used by the A and D Series locks. The rear of the plug performs the task of driver cam and receiver of the locking/unlocking bar. A retaining ring secures the plug into the F Series lock cylinder body. The F series continues to use the zinc cylinder today. These lock cylinders are designed to rotate only 90 degrees in both directions.
To service these two-piece knob locks, the exterior knob is removed from the lock assembly. The operating key had to be inserted and rotated approximately 45 degrees to clear the catch obstruction. With the key rotated, press the catch to release the knob. Slide the keyed knob off of the lock assembly. With the knob free, slide the sleeve off the back of the knob. There is an open slot large enough for the standard sized lock cylinder to slide out.
The F Series keyed locks have a similar plug diameter as the machined brass lock cylinder. This means the same Schlage ten lengths of bottom pins (0-9) and three lengths of top pins (1-3) to combinate the F Series lock cylinders. The number one top pin is .235” long and is used with bottom pin lengths 0, 1, 2, 3. The number two top pin is .200” long and used with bottom pin lengths 4, 5, 6. The number three top pin is .165” long and used with bottom pin lengths 7, 8, 9. The three lengths of top pins are designed to balance out the pin stacks.
Schlage’s part number for the keyed “F” Series lock cylinder in the two-piece Orbit design knob is 29-003. For the Plymouth, Claremont, Georgian and Bell knob designs, the part number is 29-002. The different part numbers are not interchangeable.
During the last quarter of 2004, Schlage sent out notification of the F Series keyed lock’s exterior knob design change from two pieces to a one-piece knob. This change required shortening the height of the lock cylinder bible. In order to accommodate the zero through nine depths of cut and their top pins, the pin stack still needed the standard height dimension of the lock cylinders used in the two-piece keyed knobs.
Schlage solved this problem by developing a spring loaded spring retainer that could extend to the height needed to maintain the appropriate stack height and be compressed to permit removal and installation of the lock cylinder from and into a one-piece knob.
The keyed F Series locks have a five-pin tumbler “C” keyway lock cylinder.
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