Basket

M - ISO thread (metric)

NPT - Pipe thread

G/R/RP - Withworth thread (BSPP/BSPT)

UNC / UNF - unified national thread

Other type of threads

Type of threads - Conversion factor

FAQ (Basics of thread)

Basics of thread

ISO metric thread is a globally standardized thread. Compared to standard threads (coarse threads), fine thread has a smaller pitch.

If you have any questions please contact us or check out our fittings with M thread.

Coarse thread
Pitch can be displayed or omitted after thread size

Fine thread
Pitch must be displayed after thread size

Flank angle is 60 °.
Female and male thread are both parallel.

Thread size (mm)	Major diameter (mm)	Minor diameter (mm)	Pitch (mm)
M 3	2,98	2,459	0.5
M 4	3,978	3,242	0.7
M 5	4,976	4,134	0.8
M 6	5,974	4,917	1
M 8	7,974	6,917	1.25
M 10	9,968	8,376	1.5
M 12	11,97	10,106	1,75
M 16	15,96	13,835	2
M 20	19,96	17,294	2,5
M 24	23,95	20,752	3

Thread size (mm)	Major diameter (mm)	Minor diameter (mm)	Pitch (mm)
M 3 x 0,35	2,981	2,621	0.35
M 4 x 0,5	3,978	3,242	0.5
M 5 x 0,5	4,98	4,459	0.5
M 6 x 0,75	5,978	5,188	.75
M 8 x 0,75	7,978	7,188	0.75
M 10 x 0,75	9,978	9,188	0.75
M 10 x 1	9,974	8,917	1
M 10 x 1,25	9,974	9,972	1,25
M 12 x 1	11, 97	10,917	1
M 12 x 1,25	11, 97	10,647	1.25
M 12 x 1,5	11, 97	10,376	1.5
M 16 x 1	15,97	14,917	1
M 16 x 1,5	15,97	14,376	1.5
M 20 x 1	19,97	18,917	1.0
M 20 x 1,5	19,97	18,376	1.5
M 20 x 2	19,96	17,835	2
M 24 x 1,0	23,97	22,917	1.0
M 24 x 1,5	23,97	22,376	1.5

Any Questions?

More information about our products, services or looking for a custom solution?
Please contact our Sales Engineers.

We use cookies just to track visits to our website, we store no personal details. We also us commercial cookies, accept them for a better user experience. Please refer to our Privacy Policy.