Title image from basil arteomovflickr. Often this is left off from the thread pitch.
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How to read bolt sizes. Unified screw diameters are. Sometimes it is also left off of the other parts of the size. Each part including the thread pitch is a measurement in millimeters so each may be followed by the abbreviation mm. The first number shows you the major diameter or the diameter of the grooves on the screw shaft. 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.
Use a ruler or measuring tape to measure from here to the tip of the screw. At that point it would probably be best to get the bolt in both sizes and try them out. For nuts size will appear as diameter and pitch. Read the first letter of the size. All bolts whether standard or metric are sized according to diameter thread pitch and length. The measurement of the screw on the thread.
For example i overlaid a bolt onto the print out chart to see if i could figure out what size it was. This is either the number of threads per unit of the distance between threads. Read the second number. The size of a metric screw or bolt is specified as diameter pitch and length in millimeters millimeters is abbreviated mm. In metric fasteners an x is used to seperate each of the parts of the size. For example a standard 12 162 bolt is 12 inch in diameter has 16 threads per inch and is 2 inches long.
How to measure bolt size step 1 measure the diameter of the shank. It seemed to fit the best with the 10 32 model but 8 32 was pretty darn close as well. For example if the metric bolt was m14x15x25 it would have a length of 25 millimeters. Diameter is in either inchesnot decimal or millimeter. There is an exception thoughif pitch isnt specified the fastener is coarse threaded. The bigger the number the stronger the bolt.
To determine the size of a bolt first measure the diameter. How to read screw 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. Also known as the. The shank is the shaft like part of the bolt. Determine the length of the metric bolt by looking at the third number.
Wherever the screw head would rest when it is fully embedded in something is where you start the measurement. Use the first number to figure out the diameter of the threads. Second measure the pitch pitch is threads per unit. Look on the bolt head for the number denoting the strength of the bolt. Measure in inches from the tip to where the screw head rests to get the length.
Gallery of How To Read Bolt Sizes
