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. IMPORTANT: Make sure to print this chart to Actual Size (no scaling). After printing, measure the ruler in the margin to ensure correct scale. US Machine Screw Sizes Axis of screw thread. Basic major diameter Minor diameter Basic pitch diameter. Thread Dimensions . a. Tensile strength values are based on 60,000 psi. and apply to carbon steel screws and SEMS only. Hex and Hex Washer head machine screws of sufficient length may be wedge tensile tested.

The diameter refers to the major diameter, or outside edge, of the threads. If the screw size includes a dash with a number following it, that is the number of threads per inch (tpi). Usually tpi is only shown with machine screws or other fasteners with machine screw threads. So, a 1/4-20 screw has a 1/4 diameter (.250) with 20 threads per inch. 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. Thread Dimensions ; Machine Screws METRIC Mech Perform. A metric machine screw is a straight shank fastener with a metric thread pitch designed to go through a hole or nut that is pre- tapped to form a mating thread for the screw . Machine screws form a fastening superior in strength to spaced thread screws .

Common Fasteners: Anchors, Bolts, Screws Nails Nail Size Chart : Expansion Bolt, often called the Molly bolt, for Hollow Walss (plaster board) Toggle Bolt for Hollow Walls Expansion Shield for Masonry Fiber Anchor for Masonry . Charts Tables: Nuts, Bolts Machine Screw Sizes … Printable Fastener Tools - Bolt Depot Screws Round Head Screws 1-1 Various Head Styles Machine Scerws 1-2 to 1-23 Tapping Screws (Approx. Hole Sizes ) 1-24 Thumb and Wing Screws 1-25 to 1-27 B7 Studs and Nuts Stud Bolts for Pressure-Temperature Piping 2-1 General Purpose End-to-End Studs 2-2 Tap End Stud Bolts 2-3 Double End Stud Bolts 2-4 Bolts

Machine screws are only available in smaller diameters. The threaded end of the fastener is not chamfered but rather simply sheared. The minimum thread length is a function of fastener length as follows: if fastener length 2, then min. thread length = 1.75 if fastener length 2, then min.