American standard screw thread
American standard screw thread
[ə′mer·ə·kən ′stan·dərd ′skrü ‚thred] (design engineering)
Screw thread whose dimensions conform to those of a particular series of specified sizes established as a standard in the United States; used for bolts, nuts, and machine screws.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.