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