In other examples, such as Corbin X Class (System 70), we include bottom and master pins for both available plug diameters as well as interchangeable core top pins and build-up pins. In the case of Schlage Classic that includes bottom, master, and top pins. measurement, and each respective available spacing measurement possible.įinally, we include all pin segments available for a respective key bitting specification. In each case, we have the full spacing information for all key bitting specifications. If you have a LAB Universal Pin Kit both values can be found in each manufacturer’s box. B.C.C., or Between Cut Centers, is the distance between the centers of adjacent cuts. First, T.F.C., or To First Cut, refers to the distance between the shoulder or tip, depending on if it’s tip-to-bow or bow-to-tip, to the center of key’s first cut. In our example, the measurement of the bottom a cut in Schlage’s Classic key bitting specification is. Key cuts may have different cut root shapes, or the shape of the bottom of the key cut (either flat or radium or even a perfect “V”), but the bottom of the cut will always have a measurable distance. It is also sometime referred to as cut flat. Root Cut, not to be confused with the cut root, refers to the measurement of the bottom of the individual cut itself. For Schlage Classic the included angle is 100 degrees. The measurement between each sloping surface is our included angle. Each side of the valley is what the definition refers to as a “sloping surface”. If you look at the geometry of key cuts you’ll see that they look very much like a valley. Included Angle is a measurement from one sloping surface of a cut to the opposite surface, typically stated in degrees. will not necessarily be the same as the actual plug diameter. Therefore, we must have two step, or 2 increment, progression for Schlage Classic.Į.P.D., or effective plug diameter, is the dimension obtained by adding the root depth of a key cut to the length of its corresponding bottom pin which establishes a perfect shear line. Using Schlage Classic, which is a two step progression, we cannot have a difference between cuts of 1 increment in the same chamber of a master keyed cylinder or the aforementioned risk of key interchange and cylinder failure will exist. 023″ then it is considered single step progression. 023″ then it is considered a two step progression, if it is more than. For all intents and purposes, if the increment size is less than. Due to tolerances and the potential for key interchange and even cylinder failure, progression must match the manufacturer’s specifications. Differences between cuts in progressed keys can either be 1 increment (Single Step) or 2 increments (Two Step), depending on the size of the increment. Progression relates to master keying and can be represented as either “Single Step” or “Two Step”. That might not make sense in our context but allow me to explain. Progression is defined as a logical sequence of selecting possible key bittings, usually in numerical order from the key bitting array. 015″ difference is the increment for Schlage Classic. If you look at the Root Depths, or the dimension from the bottom of a cut on a key to the bottom of the blade, you’ll notice that the measurements of different, successive depths increase or decrease, depending on the order in which you read it, by. Increment is the distance between different, successive depths. In the Schlage Classic keying system, the MACS is 7. If the adjacent cuts were 1 and 9, however, their difference would be 8, which would violate MACS and therefore would not possible. If your MACS is 7, for example, a 2 cut can be right next to a 9 cut because when subtracting their difference, 9-2=7, it is at or below the MACS of 7. MACS essentially tells you which cuts are allowed to be next to each other. MACS, or maximum adjacent cut specification, is the maximum allowable difference between adjacent cut depths. Regardless of availability, all manufacturer’s key bitting specifications include the following information: Schlage, on the other hand, leaves nothing to guess work they list just about every relevant detail necessary for generating or decoding keys and/or pins of their keying systems. At the very least, we’ve found that spacing and root depth information is listed by all manufacturers. Some manufacturers choose to share more information than others. Not all manufacturers list the same amount of information in each of their key bitting specifications. Schlage Classic key bitting specification.
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