Second measure the pitch pitch is threads per unit. In the unified thread standard uts system manufacturers list the diameter size as a number between 0 and 10 with 0 being the smallest and 10 being the largest.
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How to read standard bolt sizes. An m12 15 x 50 metric bolt is 12 mm in diameter has a thread pitch of 15 mm and is 25 mm long. This is either the number of threads per unit of the distance between threads. Screws larger than a 10 have a diameter listed directly in inches. Sometimes it is also left off of the other parts of the size. In metric fasteners an x is used to seperate each of the parts of the size. Consider this size m8 10 x 20.
Read the second number. Also known as the. The size of a metric screw or bolt is specified as diameter pitch and length in millimeters millimeters is abbreviated mm. How to read screw sizes. For example a standard 12 162 bolt is 12 inch in diameter has 16 threads per inch and is 2 inches long. For example on a 4 40 unc 3a x5 screw 4 represents the diameter.
In the above example 12 inch is the shanks diameter. Often this is left off from the thread pitch. It has a diameter of 0112 in 028 cm. Look on the bolt head for the number denoting the strength of the bolt. Each part including the thread pitch is a measurement in millimeters so each may be followed by the abbreviation mm. For nuts size will appear as diameter and pitch.
Determine the length of the metric bolt by looking at the third number. Read the first letter of the size. Use calipers to obtain an accurate measure of the shanks diameter. Measure the diameter of the shank. The chart below shows metric bolt conversions and din numbers for fasteners. All bolts whether standard or metric are sized according to diameter thread pitch and length.
For example if the metric bolt was m14x15x25 it would have a length of 25 millimeters. Diameter is in either inchesnot decimal or millimeter. The bigger the number the stronger the bolt. To determine the size of a bolt first measure the diameter. Unified screw diameters are. The measurement of the screw on the thread.
There is an exception thoughif pitch isnt specified the fastener is coarse threaded. This the largest diameter. The shank is the shaft like part of the bolt. Metric bolt conversion metric bolt conversion data for industrial boltsrods machine screws and small diameter fasteners from elgin fastener group includes metric to standard bolt conversions. Heres what the description means.
Gallery of How To Read Standard Bolt Sizes
