Step 4 combine for the final part measurement. To determine the size of a bolt first measure the diameter.
Metric Bolt Measuring Guide How To Measure A Fastener Pro
How to measure bolts length. Use calipers to obtain an. Because this is approximately the same as the major or thread diameter the thread diameter measurement can be used for fully threaded bolts. Measure the length of the. Only measure the entire length if you are working with an oval or flat head variety. 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.
Second measure the pitch pitch is threads per unit. 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. Third measure length length is measured from behind the head to end. 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. Metric are measured thread per millimeter. Diameter is in either inches not decimal or millimeter.
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. This rule for bolt length holds true for most types including cheese hex pan socket button and low socket head types. Measure the diameter of the shank. Start from right below the head including only the shank and measure to the tip. Fastener length is measured from where the material surface is assumed to be to the end of the fastener. Measure from the flat portion to the tip of the bolt.
3 write down the length measurement. Determine the thread pitch by counting the threads along the shaft. Inches are measured threads per inches. How to measure bolt size step 1. Do this by measuring one inch of the shaft.
Gallery of How To Measure Bolts Length
