GUHRING - Каталог Метчики - 2011 EN
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5NIVERSAL!PPLICATIONS
!LLOYED5NALLOYED3TEELS
UNC ANSI length - ANSI shank
2B Series 3919 - Cobalt, UNC, 40° helix, bright nish
Class of Fit Series 3922 - Cobalt, UNC, 40° helix, TiN coated
Series 3949 - Cobalt, UNC, 40° helix, TiCN coated
Blind Hole
Cut Taps 40° Helix Size No. Shank dia. Square Size Overall 2B Series Series Series Order
Semi-bottoming 2-56 Length
Chamfer Lead 3-48 Flutes inch inch Approx. 3919 3922 3949 No.
4-40 3 0.141 0.110 inch z z z 2.184
C · 2-3 5-40 3 0.141 0.110 1.751 Limits z z z 2.515
6-32 3 0.141 0.110 1.811 H2/H3 z z z 2.845
8-32 3 0.141 0.110 1.882 H2/H3 z z z 3.175
10-24 3 0.141 0.110 1.941 H2/H3 z z z 3.505
12-24 3 0.168 0.131 2.000 H2/H3 z z z 4.166
1/4-20 3 0.194 0.152 2.130 H3/H4 z z z 4.826
5/16-18 3 0.220 0.165 2.382 H3/H4 z z z 5.486
3/8-16 3 0.255 0.191 2.382 H3/H4 z z z 6.350
7/16-14 3 0.318 0.238 2.500 H3/H4 z z z 7.938
1/2-13 3 0.381 0.286 2.720 H4/H5 z z z 9.525
9/16-12 3 0.323 0.242 2.941 H4/H5 z z z 11.113
5/8-11 3 0.367 0.275 3.157 H5/H6 z z z 12.700
3/4-10 3 0.429 0.322 3.381 H5/H6 z z z 14.288
7/8-9 4 0.480 0.360 3.591 H5/H6 z z z 15.875
1-8 4 0.590 0.442 3.811 H5/H6 z z z 19.050
1 1/8-7 4 0.697 0.523 4.252 H5/H6 z z z 22.225
1 1/4-7 4 0.800 0.600 4.689 H5/H6 z z z 25.400
1 3/8-6 4 0.896 0.672 5.130 H6/H7 z z z 28.575
1 1/2-6 4 1.021 0.766 5.441 H6/H7 z z z 31.750
4 1.108 0.831 5.748 H6/H7 z z z 34.925
6 1.233 0.925 6.063 H7/H8 z z z 38.100
6.378 H7/H8
H7/H8
DIN length - DIN shank
Series 1837 - Cobalt, UNC, 40° helix, TiN coated, DIN 371, C(K) chamfer lead
Size No. Shank dia. Square Size Overall 2B DIN 371 Order
10-24 Length
12-24 Flutes mm mm Approx. Series No.
1/4-20 3 6.000 4.900 mm 4.826
5/16-18 3 6.000 4.900 70.000 Limits 1837 5.486
3/8-16 3 7.000 5.500 80.000 H3/H4 { 6.350
3 8.000 6.200 80.000 H3/H4 { 7.938
3 10.000 8.000 90.000 H4/H5 z 9.525
100.000 H4/H5 z
H5/H6 {
TECH TIP: C(K) Chamfer Lead
A C/K Chamfer lead is the same length as the C chamfer lead in that it incorporates 2 – 3 threads into the lead
length. As an optional standard this chamfer form is found on semi-bottoming taps with a 40 degree R.H. helix. After
complete production of the tap (including hard coating) with the C chamfer form – there is an additional flute grind
through the cutting chamfer at approximately a 20 degree helix. This chamfer will show its best results when used in
moderately tough materials that tend to produce long chips. The “helix correction” helps to cause an immediate ir-
regular chip flow as the chip formation is starting. This irregular chip flow helps to break the chip and allow it to flow
more freely up the flute. This geometry is very useful in applications where “birdnesting” is a common problem.
46 Bright Steam Oxide TiN TiCN MolyGlide TiAlN AlCrN FIREX®
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