Third measure length length is measured from behind the head to end. Diameter is in either inches not decimal or millimeter.
Fastener Guides Measuring Screws And Bolts Fastener
How to measure bolts length. Measure the diameter of the shank. Use a ruler or your bolt gauge to measure the length of the bolt starting at the flat portion you identified and ending at the very tip of the bolts threaded portion. Thus fasteners with heads that sit above the surface are measured from under the head to the end of the fastener while fasteners that sit flush with the surface are measured from the top of the head to the end of the fastener. Because this is approximately the same as the major or thread diameter the thread diameter measurement can be used for fully threaded bolts. How to measure bolt size step 1. Fastener length is generally measured from the point where the surface of the material will be when the fastener is installed to the end of the fastener.
Measure from the flat portion to the tip of the bolt. The shank is the shaft like part of the bolt. The diameter of a bolt is the shank diameter expressed in millimetres for metric bolts. Measure the length of the. Second measure the pitch pitch is threads per unit. Determine the thread pitch by counting the threads along the shaft.
To determine the size of a bolt first measure the diameter. Use calipers to obtain an. Start from right below the head including only the shank and measure to the tip. Do this by measuring one inch of the shaft. Metric are measured thread per millimeter. 3 write down the length measurement.
Only measure the entire length if you are working with an oval or flat head variety. Fastener length is measured from where the material surface is assumed to be to the end of the fastener. This rule for bolt length holds true for most types including cheese hex pan socket button and low socket head types. Step 4 combine for the final part measurement. Inches are measured threads per inches.
Gallery of How To Measure Bolts Length
