Metric Thread Forms and Pitch
Unless otherwise stated, Anzor's metric fasteners are Coarse Standard
|
Metric Diameter |
Pitch = P (mm) |
|
|
Coarse Standard |
Fine Standard |
|
| M2 | 0.40 | |
| M2.5 | 0.45 | |
| M3 | 0.50 | 0.35 |
| M4 | 0.70 | 0.50 |
| M5 | 0.80 | 0.75 |
| M6 | 1.00 | 0.75 |
| M8 | 1.25 | 0.50,1.00 |
| M10 | 1.50 | 1.00,1.25 |
| M12 | 1.75 | 1.00,1.25,1.50 |
| M14 | 2.00 | 1.50 |
| M16 | 2.00 | 1.50 |
| M18 | 2.50 | 1.50 |
| M20 | 2.50 | 1.50,2.00 |
| M22 | 2.50 | 1.50 |
| M24 | 3.00 | 1.50,2.00 |
| M27 | 3.00 | 1.50,2.00 |
| M30 | 3.50 | 1.50,2.00 |
| M33 | 3.50 | 2.00 |
| M36 | 4.00 | 1.50,2.00 |
| M39 | 4.00 | 1.50,2.00 |
| M42 | 4.50 | 2.00 |
ISO Metric Thread Form
P = Pitch = 1/Number of threads per inch (tpi)
H = Angular Depth = 0.866025 x P
H/8 = Shortening of major dia = 0.108253 x P
H/4 = Shortening of minor dia = 0.216506 x P
d = Actual Depth = 0.541266 x P
r = Radius at the Root = 0.1443 x P
Hn = Basic height of Internal Thread = 0.54127 x P
Hs = Basic height of External Thread = 0.61344 x P
The form of the Metric Series of Threads varies between Internal & External Threads, in particular the root and crest details. This allows for flat (truncated) or radiused forms. Engineers requiring more specific information should refer to the relevant ISO Standards.
