Etymology
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flange (n.)
1680s, "a widening or branching out," of unknown origin, perhaps related to Old French flanche "flank, hip, side," fem. of flanc (see flank (n.)). Meaning "projecting rim, etc., used for strength or guidance" is from 1735. As a verb from 1820.
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collet (n.)

1520s, in jewelery, "the ring or flange in which a jewel or group of jewels is set," from French collet "little collar" (13c.), diminutive of col "neck," from Latin collum "neck" (see collar (n.)). Meaning "a band or collar" is from 1560s.

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