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UNC
ISO 529
Nominal
Major
Diameter
d / inches
TPI
Overall
Length
Lmm
Length of
Thread
lmm
Shank
Diameter
d 1mm
Neck
Diameter
d 2mm
Neck
Length
l 1mm
Square A/F
mm
Square
Length
l 2mm
No. 1 64 41 8 2.50 - 5.5 2 4
No. 2 56 44.5 9.5 2.80 - 6 2.24 5
No. 3 48 44.5 9.5 2.80 - 6 2.24 5
No. 4 40 48 11 3.15 2.12 7 2.5 5
No. 5 40 48 11 3.15 2.36 7 2.5 5
No. 6 32 50 13 3.55 2.50 7 2.8 5
No. 8 32 53 13 4.50 3.15 8 3.55 6
No. 10 24 58 16 5.00 3.55 9 4 7
No. 12 24 62 17 5.60 4.25 9 4.5 7
1/4 20 66 19 6.30 4.50 11 5 8
5/16 18 72 22 8.00 6.00 13 6.3 9
3/8 16 80 24 10.00 7.50 15 8 11
7/16 14 85 25 8.00 - - 6.3 9
1/2 13 89 29 9.00 - - 7.1 10
9/16 12 95 30 11.20 - - 9 12
5/8 11 102 32 12.50 - - 10 13
3/4 10 112 37 14.00 - - 11.2 14
7/8 9 118 38 16.00 - - 12.5 16
1 8 130 45 18.00 - - 14 18
1 1/8 7 138 48 20.00 - - 16 20
1 1/4 7 151 51 22.40 - - 18 22
1 3/8 6 162 57 25.00 - - 20 24
1 1/2 6 170 60 28.00 - - 22.4 26
1 3/4 5 187 67 31.50 - - 25 28
2 4.5 200 70 35.5 - - 28 31
UNC
Straight Flute
No. 1 No. 2 No. 3 No. 4 No. 5 No. 6 No. 8 No. 10 No. 12 1/4
No. of Flutes 3 3 3 3 3 3 3 3 3 3
Style 1 1 1 2 2 2 2 2 2 2
5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 1 1/8
No. of Flutes 4 4 4 4 4 4 4 4 4 4
Style 2 2 3 3 3 3 3 3 3 3
1 1/4 1 3/8 1 1/2 1 3/4 2
No. of Flutes 4 4 4 6 6
Style 3 3 3 3 3
HIGH SPEED STEEL
GROUND THREAD
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