There is an exception thoughif pitch isnt specified the fastener is coarse threaded. The shank is the shaft like part of the bolt.
Excalibar To Duncan Baseplate Adapter Kit Bolt Torque
How to read bolt sizes. Look on the bolt head for the number denoting the strength of the bolt. Also known as the. Unified screw diameters are. All bolts whether standard or metric are sized according to diameter thread pitch and length. This is either the number of threads per unit of the distance between threads. At that point it would probably be best to get the bolt in both sizes and try them out.
To determine the size of a bolt first measure the diameter. The size of a metric screw or bolt is specified as diameter pitch and length in millimeters millimeters is abbreviated mm. Second measure the pitch pitch is threads per unit. For example if the metric bolt was m14x15x25 it would have a length of 25 millimeters. Each part including the thread pitch is a measurement in millimeters so each may be followed by the abbreviation mm. Use a ruler or measuring tape to measure from here to the tip of the screw.
For example i overlaid a bolt onto the print out chart to see if i could figure out what size it was. In metric fasteners an x is used to seperate each of the parts of the size. Read the first letter of the size. The measurement of the screw on the thread. Measure in inches from the tip to where the screw head rests to get the length. The first number shows you the major diameter or the diameter of the grooves on the screw shaft.
Often this is left off from the thread pitch. The bigger the number the stronger the bolt. Wherever the screw head would rest when it is fully embedded in something is where you start the measurement. How to read screw sizes. Diameter is in either inchesnot decimal or millimeter. Title image from basil arteomovflickr.
Read the second number. This the largest diameter. Determine the length of the metric bolt by looking at the third number. Sometimes it is also left off of the other parts of the size. It seemed to fit the best with the 10 32 model but 8 32 was pretty darn close as well. For nuts size will appear as diameter and pitch.
An m12 15 x 50 metric bolt is 12 mm in diameter has a thread pitch of 15 mm and is 25 mm long. Use the first number to figure out the diameter of the threads. For example a standard 12 162 bolt is 12 inch in diameter has 16 threads per inch and is 2 inches long. 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. How to measure bolt size step 1 measure the diameter of the shank.
Gallery of How To Read Bolt Sizes
