Understanding Screw Sizes – Inch Standards Screws with a diameter smaller than 1/4 have a nominal size indicated by a number (e.g. #8 or #10). A screw thread , often shortened to thread, is a helical structure used to convert between rotational and linear movement or force. A screw thread is a ridge wrapped around a cylinder or cone in the form of a helix, with the former being called a straight thread and the latter called a tapered thread. A screw thread is the essential feature of the screw as a simple machine and also as a fastener. Connect to Eaton Like us on Facebook Follow us on Twitter

Start and drive 1/4'' slotted screws with one hand. Great when you're working in hard-to-reach places. This Standard specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads. (In order to emphasize that unified screw threads are based on inch modules, they may be denoted unified inch screw threads .) The 1/4 in. hex torque drive has been calibrated for +/- 4% accuracy. It’s positive bit locking to eliminate slippage or dropping in tight spaces.

Title: Tap Drill Clearance Holes for Screw Threads 0-80 to 0.5 inch .xls Author: Richard Wegner Created Date: 7/6/2009 PM In Stock… Same day shipping inch and metric size Keyserts. Available in carbon steel and stainless steel. Contact us today! UNC and UNF - Unified Inch Screw Threads ANSI/ASME B1.1 Unified National Thread - UNC Coarse series and UNF Fine series

Rated 1 out of 5 by Jesse from Just Dig. I bought 12 of these for a new deck. By the time I found locations where these would actually screw in, I attempted approximately 20 holes.