Sandvik Coromant Threading - Manual (Page 5)

5
M10 x 1.25 5g6g
M16 - 6h
1. Basic in threads
Thread designations
International standards
To ensure that the two (internal and external) halves of a threaded
joint fi t together properly to produce a connection capable of bear-
ing a specifi ed load, threads must maintain certain standards.
International standards for thread forms have therefore been estab-
lished for all common thread types.
Below are examples of Metric, UN and Whitworth thread designa-
tions.
ISO metric thread designations
The complete thread designation is made up of values for the
thread form and the tolerance. The tolerance is indicated by a num-
ber for the tolerance grade, and letters for the tolerance position.
A fi t between threaded parts is indicated by the internal thread tolerance class
followed by the external thread tolerance class, separated by an oblique stroke.
Pitch
Tolerance class for pitch diameter
Tolerance class for crest diameter
Thread designation and nominal dimension
Tolerance class for pitch and crest position
Examples: