Page 15 - THREADING CATALOG

INTRODUCTION
INTRODUCTION

Possible Combinations of Thread Tolerances:
pich
minor
undersized diameter diameter
internal pich minor
(nut) threads diameter diameter 8 8
8 8 7 7
7 7 g 6 6

H 6 6 5 5
more precise 5 5 4 4

Basic Size 4 4
3 4

4 6
external (screw)
threads 3 4 5 8
more precise 3 4 4 5 6 8 h 6 7 - -

4 6 g 6 - 8 -
3 4 5 8 7 - 9 -
pich major
4 6 f 6 - 8 -
diameter diameter
9
-
5 6 8 - 7 - - pich major
e
8
undersized 7 8 - - pich major diameter diameter
-
9

9 - diameter diameter
pich major
diameter diameter
Thread accuracy can be classified by three classes: fine, medium, and coarse,
depending on the length of thread engagement (the length of interaction between the fastener and nut member
(i.e. nut or mating material for the screw) which is divided into three groups: short, normal, and long.

LE

LE

lE - length of thread engagement

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