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Unit:inch

Dimensions of Threads and Points for Type D, F, G, and T Thread-Cutting Tapping Screws

ASME/ANSI B 18.6.3 (T44) - 2013

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美标ASME/ANSI B18.6.3 (T44) - 2013 ASME/AN Dimensions of Threads and Points for Type D, F, G, and T Thread-Cutting Tapping Screws
Screw Thread
d
2# 2# 3# 3# 4# 4# 5# 5# 6# 6# 8# 8# 10#
PP Threads per in.
D Nominal Diameter
max
min
P Point Diameter /Ref.
S ③ For Short Screws /max
For Short Screws /min
For Long Screws /max
For Long Screws /min
L ③ Determinant Lengths /90-deg Heads
Determinant Lengths /Csk. Heads
Minimum Practical Nominal screw Length /90-deg Heads
Minimum Practical Nominal screw Length /Csk. Heads
56 64 48 56 40 48 40 44 32 40 32 36 24
0.0860 0.0860 0.0990 0.0990 0.1120 0.1120 0.1250 0.1250 0.1380 0.1380 0.1640 0.1640 0.1900
0.0860 0.0860 0.0990 0.0990 0.1120 0.1120 0.1250 0.1250 0.1380 0.1380 0.1640 0.1640 0.1900
0.0813 0.0816 0.0938 0.0942 0.1061 0.1068 0.1191 0.1195 0.1312 0.1321 0.1571 0.1577 0.1818
0.068 0.070 0.078 0.081 0.087 0.091 0.100 0.102 0.107 0.113 0.132 0.136 0.148
0.062 0.055 0.073 0.062 0.088 0.073 0.088 0.080 0.109 0.088 0.109 0.097 0.146
0.045 0.039 0.052 0.045 0.062 0.052 0.062 0.057 0.078 0.062 0.078 0.069 0.104
0.080 0.070 0.094 0.080 0.112 0.094 0.112 0.102 0.141 0.112 0.141 0.125 0.188
0.062 0.055 0.073 0.062 0.088 0.073 0.088 0.080 0.109 0.088 0.109 0.097 0.146
5/32 1/8 3/16 5/32 7/32 3/16 7/32 3/16 1/4 7/32 1/4 7/32 11/32
3/16 3/16 7/32 3/16 1/4 7/32 9/32 1/4 5/16 9/32 11/32 5/16 7/16
5/32 1/8 5/32 5/32 3/16 5/32 3/16 3/16 1/4 3/16 1/4 7/32 5/16
3/16 5/32 7/32 3/16 1/4 7/32 1/4 1/4 5/16 1/4 5/16 9/32 13/32
Screw Thread
d
10# 12# 12# 1/4 1/4 5/16 5/16 3/8 3/8 7/16 7/16 1/2 1/2
PP Threads per in.
D Nominal Diameter
max
min
P Point Diameter /Ref.
S ③ For Short Screws /max
For Short Screws /min
For Long Screws /max
For Long Screws /min
L ③ Determinant Lengths /90-deg Heads
Determinant Lengths /Csk. Heads
Minimum Practical Nominal screw Length /90-deg Heads
Minimum Practical Nominal screw Length /Csk. Heads
32 24 28 20 28 18 24 16 24 14 20 13 20
0.1900 0.2160 0.2160 0.2500 0.2500 0.3125 0.3125 0.3750 0.3750 0.4375 0.4375 0.5000 0.5000
0.1900 0.2160 0.2160 0.2500 0.2500 0.3125 0.3125 0.3750 0.3750 0.4375 0.4375 0.5000 0.5000
0.1831 0.2078 0.2085 0.2408 0.2425 0.3026 0.3042 0.3643 0.3667 0.4258 0.4281 0.4876 0.4906
0.158 0.174 0.180 0.200 0.214 0.257 0.271 0.312 0.333 0.366 0.387 0.423 0.450
0.109 0.146 0.125 0.175 0.125 0.194 0.146 0.219 0.146 0.250 0.175 0.269 0.175
0.078 0.104 0.089 0.125 0.089 0.139 0.104 0.156 0.104 0.179 0.125 0.192 0.125
0.141 0.188 0.161 0.225 0.161 0.250 0.188 0.281 0.188 0.321 0.225 0.346 0.225
0.109 0.146 0.125 0.175 0.125 0.194 0.146 0.219 0.146 0.250 0.175 0.269 0.175
1/4 11/32 5/16 13/32 5/16 15/32 11/32 1/2 11/32 19/32 13/32 5/8 13/32
11/32 7/16 13/32 17/32 13/32 19/32 15/32 11/16 1/2 3/4 9/16 25/32 9/16
1/4 5/16 9/32 3/8 9/32 7/16 5/16 15/32 5/16 9/16 3/8 19/32 3/8
5/16 13/32 3/8 1/2 3/8 9/16 15/32 5/8 1/2 23/32 17/32 3/4 17/32
①,Points of screws shall be tapered and fluted or slotted as illustrated above for the respective types. The flute on Type T screws shall have an included angle of 90 deg to 95 deg and the thread cutting edge located above the axis of screw. Tapered threads shall have unfinished crests, and the flutes or slots shall extend through the first full thread beyond taper except for Type F screws on which tapered threads may be complete at manufacture's option and flutes may be one pitch short of the first full form thread. Other details of taper and flute design shall be potional with the manufacturer, provided the screws meet the specified performance requirements.
③,Screws of these nominal lengths and shorter shall have point taper lengths specified for short screws. Longer lengths shall have point taper lengths specified for long screws.

Alternative history

ASME/ANSI B 18.6.3 - 2010 ASME/ANSI B 18.6.3 - 2010 ASME/ANSI B 18.6.3 - 2010 ASME/ANSI B 18.6.3T44 - 2013 ASME B 18.6.3T4.1.2.2-1 - 2024
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