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). 1/4 and larger diameters are shown as inches. The diameter refers to the major diameter, or outside . Common Screw Size Conversion Chart . Machine Screw and Drill Size Chart (English ) Clearance Hole Drills Screw Designation Tap Drill Size Close Fit Loose Fit Number Diameter Pitch Tap Size Drill Diameter Drill Diameter Drill Diameter or dia. (inch) (threads/inch) Size (inch) Size (inch) Size (inch) #0 0.06 80 0-80 3/64 0.0469 52 0.0635 50 0.07 TRADITIONAL WOOD SCREWS PRODUCTION SCREWS 1/4 3/8 1/2 5/8 3/4 1 1 1/4 1 1/2 1 3/4 2 2 1/4 2 1/2 2 3/4 3 3 1/4 3 1/2 3 3/4 4 Gauge 23 4567 8 9 10 12 14 6 8 10 Head-Bore Size Shank-Hole Size Pilot-Hole Size Hardwood Softwood Available Lengths Phillips-Head Point Size Square-Drive Bit Size

All about screws : . sizes for various sized screws . See the loading charts below to see typical differences between the tensile strength of a fine vs coarse thread. A 1/4 UNF thread is about 14% stronger than its UNC counterpart. mm 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 in 230 1 2 3 4 5 6 7 8 9 Copyright 2000-2017 Bolt Depot Inc. IMPORTANT: screw information chart : head types flat truss pan head round head round washer hex head hex washer truss head oval head flat head trim head one-way head mod truss bugle head pancake head wafer head how to measure a screw : flat round oval hex pan truss. screw size nominal size basic screw diameter actual size 0 0.0600 1 0.0730 2 0.0860 3 0.

Metric Screw Thread Chart Metric Tap Size Tap Drill (Inches) Clearance Drill (Inches) . Standard Screw Thread Chart Standard Thread Size Tap Drill Size (Inches) Clearance Drill Size (Inches) . The values listed in the chart above are heremended values for a class 2 thread fit. FASTENER TECHNICAL DATA AND CHARTS SECTION IMPORTANT DISCLAIMER . cap screws , carriage bolts, plow bolts, lag screws , studs, nuts, rivets and others - which have been standardized over the years as . various types and sizes but heavy head bolts have more limited availability.