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Dimensions of Threads and Points for Type B and BP Thread-Forming Tapping Screws

ASME/ANSI B 18.6.3 (T41) - 2013

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美标ASME/ANSI B18.6.3 (T41) - 2013 ASME/AN Dimensions of Threads and Points for Type B and BP Thread-Forming Tapping Screws
Screw Thread
d
0# 1# 2# 3# 4# 5# 6# 7#
PP Threads per in.
D Nominal Diameter
max
min
d max
min
P Ref.
L Type B 90-deg Heads /min
Type B CsK. Heads /min
Type BP 90-deg Heads /min
Type BP Csk. Heads / min
48 42 32 28 24 20 20 19
0.0600 0.0730 0.0860 0.0990 0.1120 0.1250 0.1380 0.1510
0.060 0.075 0.088 0.101 0.114 0.130 0.139 0.154
0.054 0.069 0.082 0.095 0.108 0.123 0.132 0.147
0.036 0.049 0.064 0.075 0.086 0.094 0.104 0.115
0.033 0.046 0.060 0.071 0.082 0.090 0.099 0.109
0.031 0.044 0.058 0.068 0.079 0.087 0.095 0.105
1/8 1/8 5/32 3/16 3/16 7/32 1/4 1/4
1/8 5/32 3/16 7/32 1/4 9/32 9/32 5/16
5/32 3/16 1/4 9/32 5/16 11/32 3/8 13/32
3/16 7/32 9/32 5/16 11/32 13/32 7/16 15/32
Screw Thread
d
8# 10# 12# 1/4 5/16 3/8 7/16 1/2
PP Threads per in.
D Nominal Diameter
max
min
d max
min
P Ref.
L Type B 90-deg Heads /min
Type B CsK. Heads /min
Type BP 90-deg Heads /min
Type BP Csk. Heads / min
18 16 14 14 12 12 10 10
0.1640 0.1900 0.2160 0.2500 0.3125 0.3750 0.4375 0.5000
0.166 0.189 0.215 0.246 0.315 0.380 0.440 0.504
0.159 0.182 0.208 0.237 0.306 0.371 0.429 0.493
0.122 0.141 0.164 0.192 0.244 0.309 0.359 0.423
0.116 0.135 0.157 0.185 0.236 0.299 0.349 0.413
0.112 0.130 0.152 0.179 0.230 0.293 0.343 0.407
9/32 5/16 11/32 3/8 15/32 17/32 5/8 11/16
11/32 3/8 7/16 1/2 19/32 11/16 25/32 27/32
7/16 1/2 9/16 21/32 27/32 15/16 1-1/8 1-1/4
1/2 19/32 21/32 3/4 31/32 1-1/8 1-1/4 1-13/32
①,Threads within point taper length shall have unfinished crests.
②,The width of flat at crest of thread shall not exceed 0.004 in. for sizes up to and including No.8, and 0.006 in. for large sizes.

Alternative history

ASME/ANSI B 18.6.3 - 2010 ASME/ANSI B 18.6.3 - 2010 ASME/ANSI B 18.6.3T41 - 2013 ASME B 18.6.3T4.1.1.2-1 - 2024
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