General-purpose screw threads
ISO 68 standard contains provisions that constitute provisions of this part of ISO 68.
International Standard ISO 68-1 was created by Technical Committee ISO/TC 1, Screw threads, Subcommittee SC 1
This first edition, together with ISO 68-2 replaced and canceled ISO 68:1973 which has been technically revised by separating the metric dimensions from the imperial dimensions.
ISO 68 consists of the following parts under the general title ISO general purpose screw threads — Basic profile
- Part 1: Metric screw threads
- Part 2: Inch screw threads
D is the basic major diameter of internal thread (nominal diameter)
d is the basic major diameter of the external thread (nominal diameter)
D2 is the basic pitch diameter of the internal thread
d2 is the basic pitch diameter of the external thread
D1 is the basic minor diameter of the internal thread
d1 is the basic minor diameter of the external thread
H is the height of the fundamental triangle
P is the pitch
ISO 68:1998 (EN) contains provisions which, through reference in this text, constitute provisions of this part of ISO 68. At the time of publication, the editions indicated were valid.
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