73
Tap Tolerance Classes
Relationships of Tap Classes to Nut Tolerances
Metric Threads
Unified Threads
6G
(MAX)
5G
(MAX)
4G
(MAX)
MINIMUM
'G' GRADES
NUTS
8H
(MAX)
7H
(MAX)
6H
(MAX)
5H
(MAX)
4H
(MAX)
MIN.
'H' GRADES
BASIC
PITCH DIAMETER
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
TOLERANCE BAND
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
CLASS1
CLASS2
CLASS3
TOLERANCE BAND
NUTS
1B
(MAX)
2B
(MAX)
3B
(MAX)
MINIMUM ALL NUT CLASSES BASIC
PITCH DIAMETER
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
CLASS1
CLASS2
CLASS3
