For Metric parallel threads, taking a caliper reading of the threads outer diameter in millimetres (mm) will give a reading of the exact thread size but not the thread pitch. For example, a caliper reading of 12.03mm indicates it is very likely a 12mm thread.

How do I tell what type of pipe thread I have?

Use a caliper, measuring tape, or ruler to measure the thread diameter of a male thread or female thread. Measure the inner diameter (ID) of the female thread and the outer diameter (OD) of the male thread. This number will help determine the thread dimension.

How do you identify metric fittings?

Quote from the video:
Quote from Youtube video: While metric threads are measured by the actual distance between thread crests and millimeters. Now that we understand a bit more about British and metric fittings let's get started number one confirm

How do I know if my metric thread is fine or coarse?

For metric fasteners, you will see a M8 x 1.25 or an M8 x 1. For thread pitch, the distance between two points is the second number meaning the higher the number the fewer threads there are. This means the M8 x 1.25 is the coarse threading and the M8 x 1 is the fine thread.

How do you tell if a metric thread is internal or external?

Metric thread pitch is designated as the distance between threads (pitch) in millimeters. On an internal thread, the minor diameter occurs at the crests and the major diameter occurs at the roots. On an external thread, the major diameter is at the thread crests, and the minor diameter is at the thread roots.

How do I identify a thread?

Quote from the video:
Quote from Youtube video: Use a caliper to measure the nominal male or female thread press to crest diameter on the first fourth.

Is there a metric pipe thread?

Pipe Threads. These metric pipe thread sizes have been adopted by the ISO (International Standards Organization), and are primarily intended for pipes or tubes for screwing together or into ISO pipe ports on valves, cylinders, pumps, and other components.

What is the difference between BSP and metric?

Although BSP is a foreign thread, it isn’t actually metric. This is why it comes in imperial sizes: 1/8, 1/4, 1/2, 3/4, and so on. BSP parallel threads commonly seal via a 30° chamfer on the male thread to a 30° recessed cone inside the female thread (swivel only).

How do you identify BSP and NPT threads?

Quote from the video:
Quote from Youtube video: Between the peaks on the threads is different between bsp and NPT this is called the pitch of the thread.

How do you call a metric thread?

Metric threads express diameter with M followed by the diameter in millimeters, like example C. Understand the second number in the callout – This indicates the distance between threads. It can be expressed as the number of threads per unit or as the distance between identical threads (the pitch).

What does 6H mean on metric threads?

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. Jaswant P R. Answered on 4 May, 2014 04:39 PM. M8 means metric thread of 8mm outer diameter.

What is an M10 thread?

For example, the thread “M10” automatically means a coarse pitch, while any added pitch callout, such as M10x1. 25, specifies a non-coarse pitch. This method of designation has the major benefit that average citizens do not need to memorize pitches just to identify a coarse thread.

How do you read a metric tap size?

Fractional sizes are listed in inches, while metric sizes are listed in millimeters following the letter “M”. A screw size number corresponds to a diameter which is larger for a higher screw size. The thread spacing, which may be coarse or fine, is listed after the diameter.

What is standard metric thread?

Standard metric screw threads are designated by pitch in millimeters (mm). This is the distance measured between the peaks of two adjacent threads. ASTM fastener standards measure threads by TPI: threads per inch. You literally just count the number of threads that cover a one-inch distance.

What diameter is M12?


M12 bolts are a metric sized bolt with a 12mm thread diameter.

What size is M6 in mm?

6 mm

M6 Threads

M6 refers to a metric 6 mm screw. The outside diameter of the threads is 6 mm. The standard metric rack screw is actually an M6 x 0.1 mm.

Is 12mm and M12 the same?

Yes. M12 is a 12mm diameter thread. You have to be sure the thread pitch measured in threads per millimeter (1.5 here) is the same as what u need.

What is m14 thread?

The threads of an M14-2.0 screw, which is coarse, are spaced 0.079 inches (2.0 mm).

Table 1.

Pitch (mm) Pitch (inches) Threads per Inch
0.35 0.0138 72.57
0.4 0.0157 63.50
0.45 0.0177 56.44
0.5 0.0197 50.80

Is M8 the same as 8mm?

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.

Is M14 the same as 14mm?

M14 and 14mm are the same thing. M14 means that the kit is 14mm.