OK OK here it is from the Nev Gam.Control Regs in shortened form:
12.040 Speicifications for Chips
1. Unless the chairman approves otherwise, chips must be disk shaped, must be .130 inch thick and must have a diameter of:
(a) 1.55 inches for chips used at games other than baccarat; and

(b) 1.55 inches or 1.6875 inches, for chips used at baccarat; and

(c) 1.6875 inches for chips used exclusively at race books and sports pools or other counter games.

adopted 6/87/ last millennium (I added the last part)

.130 inches thick... Mel