The size of a metric screw or bolt is specified as diameter, pitch and length, in millimeters (millimeters is abbreviated mm). For nuts, size will appear as diameter and pitch. There is an exception though—if pitch isn't specified, the fastener is coarse threaded. Consider this size…. M8-1.0 x 20. Fastener and Screw / Bolt Design, Formula and Calculations. The following table chart defines standard metric external thread size M1.6 to M18 per. ANSI/ASME B1.13M-1995. These thread sizes and classes represent bolts and screws, as well, as other standard external threads. Do not use these values for standard metric internal thread design. 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.

Drive Tool Sizes for Industrial Fasteners ; . Metric bolt conversion data for industrial bolts /rods, machine screws and small diameter fasteners from Elgin Fastener Group includes metric to standard bolt conversions. The chart below shows metric bolt conversions and DIN numbers for fasteners . We will have a grid of logos, when clicked takes you to their estore website. The following are to links of ISO Metric Hardware Specifications Table Charts . ISO Metric Hardware Specifications Table Chart . ANSI Hardware Menu . Metric External ( Fasteners ) Thread and Fastener Sizes M20 - M55; Metric External ( Fasteners ) Thread and Fastener Sizes M56 - M78;

With metric threads tapping drill size is easy to work out because it is the bolt diameter minus the thread pitch so, for example, a standard pitch M16 bolt has a pitch of 2.0mm so the tapping drill size is 16 - … CONVERSION (SAE to Metric Metric to SAE) To convert inches to millimeters, multiply inches x 25.4. To convert millimeters to inches multiply millimeters x 0.039370.