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Unit:inch

Type B and BP, Thread Forming Tapping Screws [Table 6]

ASME B 18.6.4 (B/BP) - 1998 (R2005)

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美标ASME B18.6.4 (B/BP) - 1998 (R2005) ASM Type B and BP, Thread Forming Tapping Screws [Table 6]
Nominal Diameter
0# 1# 2# 3# 4# 5# 6# 7#
Nominal Diameter
PP
d max
min
d1 max
min
dp Ref.
s max
min
L Type B,min 90° Heads
Csk. Heads
Type BP,min 90° Heads
Csk. Heads
0.0600 0.0730 0.0860 0.0990 0.1120 0.1250 0.1380 0.1510
48 42 32 28 24 20 20 19
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
0.042 0.048 0.062 0.071 0.083 0.100 0.100 0.105
0.031 0.036 0.047 0.054 0.063 0.075 0.075 0.079
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
Nominal Diameter
8# 10# 12# 1/4 5/16 3/8 7/16 1/2
Nominal Diameter
PP
d max
min
d1 max
min
dp Ref.
s max
min
L Type B,min 90° Heads
Csk. Heads
Type BP,min 90° Heads
Csk. Heads
0.1640 0.1900 0.2160 0.2500 0.3125 0.3750 0.4375 0.5000
18 16 14 14 12 12 10 10
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
0.111 0.125 0.143 0.143 0.167 0.167 0.200 0.200
0.083 0.094 0.107 0.107 0.125 0.125 0.150 0.150
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,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 larger sizes.
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