How do you read bolt sizes?

What do bolt size numbers mean?

The number 1 or number larger than one, or number one or number larger than one followed by a fraction, is the diameter of the shaft. The number following the hyphen is the number of threads per inch; that is, the number of threads on the shaft itself, per inch of shaft length. Same as for smaller parts.

How are bolt sizes written?

Diameter is typically measured on the outside of the threads. For US fasteners this is measured in inches (except for small diameters, where diameters are numbered), and for metric fasteners it is measured in millimeters (abbreviated mm or prefixed by M).

What does m8x1 25 mean?

M means metric. 8 means 8mm nominal diameter (the thread will be less than 8 mm at the widest point) X 1.25 means 1.25 mm per thread (thanks the standard coarse pitch for this thread)

How do you read a bolt type?

How to Read Screw Sizes

  1. Read the first letter of the size. This the largest diameter: the measurement of the screw on the thread. …
  2. Read the second number. …
  3. Read the third number, generally the one following the "x."

What does a #8 screw mean?

Their size is described as diameter, number of threads per inch (if used with a nut or in a threaded hole), and length in inches. … In all cases, the larger the number, the larger the size. Consequently a #8 screw is larger than a #4 screw, just as a 3 inch bolt is larger than a 2 inch bolt.

What does M8 mean on a bolt?

The defined diameter of metric bolts is actually slightly larger than the actual diameter of the bolt shaft. So an M8 bolt would have a shaft diameter that's slightly under 8mm which means that the bolt should fit through an 8mm hole.

What does M14 mean on a bolt?

M14 means it is metric with a 14mm outside diameter.

How do you read threads?

0:202:15How to Read a Metric Screw Thread Callout — YouTubeYouTube

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