SFIC key blanks are famous for needing high accuracy when cutting. Many of the SFIC keyways tend to tilt in the jaw, causing inaccurate cuts. Fortunately, this can be prevented by placing a shim underneath the key while clamping into the jaw.
Following is a list of SFIC key blanks and which do or don’t need a shim to hold the key properly in various key machine jaws:
SFIC KEY BLANK SHIMMING REFERENCE
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