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Unit:inch

Dimensions of Threads and Points for Type AB and Type ABR Thread-forming Screws

ASME/ANSI B 18.6.3 (T40) - 2013

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美标ASME/ANSI B18.6.3 (T40) - 2013 ASME/AN Dimensions of Threads and Points for Type AB and Type ABR Thread-forming Screws
Screw Thread
d
(0#) (1#) 2# (3#) 4# (5#) 6# (7#)
PP Threads per in.
D Nominal Diameter
max
min
d max
min
L 90-deg Heads /min
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
1/8 5/32 3/16 3/16 7/32 1/4 9/32 5/16
5/32 3/16 7/32 1/4 9/32 5/16 11/32 3/8
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
L 90-deg Heads /min
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
5/16 3/8 7/16 1/2 5/8 3/4 7/8 1
3/8 7/16 21/32 19/32 3/4 29/32 1-1/32 1-5/32
①,1. No extrusion of excess metal beyond the apex of the point resulting from thread rolling shall be permissible. A slight rounding or truncation of the point is desirable.
2. If a nonsharp point is specifically required, designate the screw as "ABR." The reference point radius is 15% of the D diameter.
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 18.6.3T40 - 2013 ASME B 18.6.3T4.1.1.1-1 - 2024
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