# What does m8x1 25 6H mean?

## What does m8x1 25 6H mean?

m8 means metric thread 8mm of ISO standard and 6H refers to tolerance of threaded hole (know more about it in ISO 2768) 2 0.

What is 6H tolerance class?

The 5g indicates the tolerance class for the pitch diameter and 6g is the tolerance class for the major diameter. For example: M12 x 1 – 6H/5g6g indicates a tolerance class of 6H for the nut (female) thread and a 5g tolerance class for the pitch diameter with a 6g tolerance class for the major diameter.

What is meant by m8x1 25 thread?

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)

### What is tolerance class thread?

Tolerances are written as a combination of a tolerance band, signified by an alphabetic letter, and a tolerance class, signified by a number. As an example, a common screw thread tolerance is 5g6g, which indicates a 5g tolerance on its pitch diameter, and a 6g tolerance on its external (thread) diameter.

What does D6 mean on a tap?

D6 = Basic plus . 0030 = max. tap P.D. CHART 1A. Pitch Diameter Limits for taps to 1″ diameter inclusive: L1 = Basic to Basic minus .

What does H mean on a thread?

The pitch diameter tolerance for each class of thread establishes how loose or tight the threaded assembly will be before it is tightened. H (high) represents a pitch diameter that is larger than the basic pitch diameter, and L (low) represents a pitch diameter that is smaller.

#### What is the H value on a tap?

H (high) represents a pitch diameter that is larger than the basic pitch diameter, and L (low) represents a pitch diameter that is smaller. The number after the H or L, indicates the amount it is different than the basic pitch diameter.

What is the difference with H for taps?

The difference in size from one H limit to the next is 0.0005″ increments for taps through 1″ diameter. Sizes over 1″ diameter are separated by . 001″ diameter increments. If the threads in the part are too loose, smaller numbers such as H1 or H2 are used.

How is TPI measured?

Measuring Imperial Thread Pitch As the name suggests, TPI is measured by counting the number of thread peaks along a 1 inch length. The TPI measurement is then often affixed to the diameter of the thread to form a common imperial thread size, e.g. ‘1/4-20’, which would denote a ¼ inch diameter, and 20 threads per inch.