Tap size Basic major dia (mm) Basic major dia (inch)
M18 x 1.5 18mm .7087
M20 x 2.5 20mm .7874
M20 x 1.5 20mm .7874
M22 x 2.5 22mm .8661

Metric Thread Pitch and Tapping Sizes

Size Pitch (mm)
M12 1.75 1.25
M16 2.0 1.5
M20 2.5 1.5
M24 3.0 2.0

Hole size for general Metric threads

Nominal size Pitch Percentage of thread engagement hole diameter (mm)
M3 0.35 2.7
M3.5 0.6 2.98
0.35 3.2
M4 0.75 3.35

What are different types of threads?

Six Most Common Types of Threads

• UN/UNF.
• NPT/NPTF.
• BSPP (BSP, parallel)
• BSPT (BSP, tapered)
• metric parallel.
• metric tapered.

Thread Count/Pitch US fasteners specify threads per inch (TPI), commonly called thread count, so 20 would represent 20 threads per inch. Metric fasteners instead specify a thread pitch which is the distance between the threads. Therefore, a 1.5 pitch would have 1.5 millimeters between each thread.

What size is M3 in Imperial?

Body Size Metric Nearest Imperial Equivalent Size
M2.5 3-56
M3 4-48
M3.5 6-40
M4 8-36

How is TPI calculated?

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 ΒΌ inch diameter, and 20 threads per inch.

Is M10 same as 10mm?

If the size is M10 x 25, that would mean that the diameter is 10 mm. Since there is no thread pitch listed, the fastener is assumed to have a coarse thread. Imperial measurement fasteners are classified by threads per inch, so a 1/4-20 bolt has 20 threads per inch (TPI), while a 10-24 screw has 24 threads per inch.

How big is an m in thread size?

Metric External Table Chart Thread Sizes M 56 – M 78 Metric External Table Chart Thread Sizes M 80 – M 100 Metric External Table Chart Thread Sizes M 105 – M 135

What kind of cable does McMaster M20 use?

Metric Threads are also VDE certified, meaning they meet European safety standards. For technical drawings and 3-D models, click on a part number. Temp. A rubber bushing with an oval slot resists water and provides entry for building cable, which is also known as Romex type NM-B or type UF-B cable.

How big are external threads in an ISO?

The following are metric external thread size table chart for sizes M20 to M55 per. ANSI/ASME B1.13M-1995. These thread sizes and classes represent bolts and screws, as well, as other standard external threads. Do not use these values for standard metric internal thread designs.

How big is an external metric thread chart?

Standard External Metric Thread and Fastener Sizes M 0.25 – M 1.4; Metric External Table Chart Thread Sizes M 20 – M 55; Metric External Table Chart Thread Sizes M 56 – M 78 ; Metric External Table Chart Thread Sizes M 80 – M 100 ; Metric External Table Chart Thread Sizes M 105 – M 135; Metric External Table Chart Thread Sizes M 140 to M 175