The Schlage F51 supports the use of an SC1 keyway.
Below table describes what a SC keyway is:
ILCO is a manufacturer that uses “SC” as a designation to represent Schlage keys. ILCO is not affiliated with Schlage so a key with an SC designation was never manufactured by Schlage.
Customers cannot use a "E" keyway in our residential locks.
The following table lists the more popular ILCO SC designations.
| ILCO DESIGNATION | SCHLAGE KEYWAY |
| SC1 | 5 pin C |
| SC4 | 6 pin C |
| SC7 | 5 pin F |
| SC8 | 5 pin E |
| SC9 | 6 pin E |
| SC10 | 6 pin F |
| SC21 | 6 pin CE |
| SC24 | 6 pin EF |
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