The smooth part of a fastener above the threads. ... This is measured from the bottom of the head to the start of the transition to threads. Body Diameter. The diameter of the body or smooth part of the bolt/screw above the threads. Also called shank diameter (S in the illustration).
What diameter is a 5/16 bolt?
How do you measure bolt size?
To measure the diameter of screws and bolts, you measure the distance from the outer thread on one side to the outer thread on the other side. This is called the major diameter and will usually be the proper size of the bolt.
What do the numbers on a bolt mean?
The higher the grade, the stronger the bolt. English bolts have radial lines on their head to identify the grade, or strength class. The number of lines on the bolt head is 2 less than the actual grade. So, for example, a grade 5 bolt will only have 3 radial lines on its head.15 feb 2019
What length of bolt should I use?
A typical rule of thumb . . . Use a bolt diameter that is 1.5 – 2.5 times (up to three times) the thickness of the thinner material you are bolting together. So, for 1/8″ material, a 1/4″ diameter is often a good bolt choice. For 1/4″ thick material, perhaps a 3/8″ or 1/2″ bolt.12 nov 2019
How do you determine bolt length?
Fastener length is measured from where the material surface is assumed to be, to the end of the fastener. For fasteners where the head usually sits above the surface, the measurement is from directly under the head to the end of the fastener.
How do I choose the right bolt?
- First, identify the load case.
- Determine the necessary clamping force in the joint.
- Choose the smallest bolt diameter that can support the clamp load.
- Choose an effective bolt securing method.
- Decide on the most appropriate tightening method.
How long should bolt be for nut?
How many threads should protrude through a nut in an optimal joint? The generally accepted answer is 1 to 3 threads. Most externally threaded fastener blanks are manufactured with a header point prior to thread rolling, which leaves the first 1 to 2 threads undersized for ease of assembly.1 jun 2018