Metric Pipe Thread Sizes Chart

September 19, 2024 Post a Comment

Metric pipe thread sizes chart

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.

How are metric pipe thread sizes measured?

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.

What are standard metric thread sizes?

Size - Nominal Diameter (mm)	Pitch¹⁾ (mm)	Tap Drill (mm)
M 6	1.00	5.00
M 8	1.25	6.80
M 10	1.50	8.50
M 12	1.75	10.20

What is metric pipe thread called?

If your equipment uses METRIC tubing, it will most likely use BSPT thread. BSPP - British Standard Pipe Parallel Thread also commonly referred to as G thread is commonly found on equipment made outside of the US.

How many types of metric threads are there?

Six Most Common Types of Threads UN/UNF. NPT/NPTF. BSPP (BSP, parallel) BSPT (BSP, tapered)

How do you specify metric threads?

ISO Metric threads are designated by the letter M followed by the values of the nominal diameter and thread pitch expressed in millimeters, separated by the sign “x” for example M2 x .

Is BSP the same as 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.

What are pipe thread sizes?

Commonly used sizes are 1⁄8, 1⁄4, 3⁄8, 1⁄2, 3⁄4, 1, 1+1⁄4, 1+1⁄2, 2, 2+1⁄2, 3, 4, 5, and 6 inch, as pipe and fittings by most US suppliers. Sizes smaller than 1⁄8 inch are occasionally used for compressed air, while sizes larger than 6 inches are often joined by other methods.

What are the 3 basic types of threads?

There are three standard thread series in the Unified screw thread system that are highly important for fasteners: UNC (coarse), UNF (fine), and 8-UN (8 thread).

What size is M6 in mm?

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 1 mm. The number 1 mm refers to 1 threads per millimeter.

What size thread is M10?

Thread Size	Nominal Diameter (mm)	Thread Pitch (mm)
M8	8.0	1.25
M10	10.0	1.50
M12	12.0	1.75
M14	14.0	2.00

What is the most common metric thread pitch?

Coarse is the most common metric thread and, as we've mentioned, coarse is assumed when pitch isn't specified. See the table below… Table 2.

How do I identify pipe threads?

Threads have a gender—either male or female. The threads are on the outside of a male fitting and on the inside of a female fitting. The outer diameter is smaller on a male thread than a female thread because the male end compresses into the female end.

Is NPT metric or imperial?

Most pressure gauges around the world have either an NPT or G (metric) connection for insertion into processes.

Are NPT and BSP the same?

NPT and BSP threads are not interchangeable due to the differences in thread forms. NPT threads are pointed in the peaks and valleys, where BSPs are rounded. Most notably, the NPT thread angle is 60 degrees versus the BSP 55-degree angle.

What are the two most common categories of metric thread?

The most common thread type from this list is the Unified coarse/fine threads that are measured in inches. The second most common type of thread is the metric coarse/fine threads. These are measured in millimeters. Each kind of thread has its own purpose based on its thickness and material.

Are all metric threads the same?

Metric thread sizes are specified differently than inch thread sizes. Inch sizes are specified using the nominal major diameter and the number of threads per inch. For example, a 3/8-16 (coarse) thread has a 3/8" nominal major diameter and 16 threads per inch.

How do I determine thread size?

Use a caliper to measure the nominal male or female thread press to crest diameter on the first

What are metric thread classes?

Metric thread fits: The class fit is specified by tolerance grade (numeral) and by tolerance position (letter). If thread fit designation (e.g., "-6g") is omitted (e.g., M10 x 1.5), it specifies a "medium" fit, which is 6H/6g. The 6H/6g fit is the standard ISO tolerance class for general use.

Are metric threads different than standard?

Metric thread pitch measurements are read differently than standard ones. While for standard thread pitch measurements the lower number is coarse thread and the higher number refers to fine thread, in metric this is opposite. M10-1.50 is a coarse thread denotation while M10-1.25 is a fine pitch.