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