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5NIVERSAL!PPLICATIONS
!LLOYED5NALLOYED3TEELS
UNC / ANSI length - ANSI shank
UNF
Series 3977 - Cobalt, UNC, 40° helix, TiN coated, Form E
2B
Cut Taps Class of Fit Size No. Shank dia. Square Size Overall 2B Series Order
Length
Blind Hole 2-56 Flutes inch inch Approx. 3977 No.
40° Helix 3-48 3 0.141 0.110 inch z
Full-bottoming 4-40 3 0.141 0.110 Limits z 2.184
Chamfer Lead 5-40 3 0.141 0.110 1.751 z 2.515
6-32 3 0.141 0.110 1.811 H2/H3 z 2.845
E · 1.5 - 2 8-32 3 0.141 0.110 1.882 H2/H3 z 3.175
10-24 3 0.168 0.131 1.941 H2/H3 z 3.505
12-24 3 0.194 0.152 2.000 H2/H3 z 4.166
1/4-20 3 0.220 0.165 2.130 H3/H4 z 4.826
5/16-18 3 0.255 0.191 2.382 H3/H4 z 5.486
3/8-16 3 0.318 0.238 2.382 H3/H4 z 6.350
7/16-14 3 0.381 0.286 2.500 H3/H4 z 7.938
1/2-13 3 0.323 0.242 2.720 H4/H5 z 9.525
9/16-12 3 0.367 0.275 2.941 H4/H5 z 11.113
5/8-11 3 0.429 0.322 3.157 H5/H6 z 12.700
3/4-10 4 0.480 0.360 3.381 H5/H6 z 14.288
7/8-9 4 0.590 0.442 3.591 H5/H6 z 15.875
1-8 4 0.697 0.523 3.811 H5/H6 z 19.050
1 1/4-7 4 0.800 0.600 4.252 H5/H6 z 22.225
1 1/2-6 4 1.021 0.766 4.689 H5/H6 z 25.400
6 1.233 0.925 5.130 H6/H7 z 31.750
5.748 H6/H7 38.100
6.378 H7/H8
H7/H8
ANSI length - ANSI shank
Series 3978 - Cobalt, UNF, 40° helix, TiN coated, Form E
Size No. Shank dia. Square Size Overall 2B Series Order
Length
2-64 Flutes inch inch Approx. 3978 No.
3-56 3 0.141 0.110 inch z
4-48 3 0.141 0.110 Limits z 2.184
5-44 3 0.141 0.110 1.751 z 2.515
6-40 3 0.141 0.110 1.811 H2/H3 z 2.845
8-36 3 0.141 0.110 1.882 H2/H3 z 3.175
10-32 3 0.168 0.131 1.941 H2/H3 z 3.505
12-28 3 0.194 0.152 2.000 H2/H3 z 4.166
1/4-28 3 0.220 0.165 2.130 H2/H3 z 4.826
5/16-24 3 0.255 0.191 2.382 H2/H3 z 5.486
3/8-24 3 0.318 0.238 2.382 H3/H4 z 6.350
7/16-20 3 0.381 0.286 2.500 H3/H4 z 7.938
1/2-20 3 0.323 0.242 2.720 H3/H4 z 9.525
9/16-18 3 0.367 0.275 2.941 H3/H4 z 11.113
5/8-18 3 0.429 0.322 3.157 H3/H4 z 12.700
3/4-16 4 0.480 0.360 3.381 H4/H5 z 14.288
7/8-14 4 0.590 0.442 3.591 H4/H5 z 15.875
1-12 4 0.697 0.523 3.811 H4/H5 z 19.050
1 1/4-12 4 0.800 0.600 4.252 H4/H5 z 22.225
1 1/2-12 4 1.021 0.766 4.689 H5/H6 z 25.400
6 1.233 0.925 5.130 H6/H7 z 31.750
5.748 H6/H7 38.100
6.378 H6/H7
H6/H7
48 Bright Steam Oxide TiN TiCN MolyGlide TiAlN AlCrN FIREX®
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