ANSI/ASME B 18.6.3 - 2013 80° Dimensions of Flat Coutersunk Trim head Screws


Unit: inch
美标ANSI/ASME B18.6.3 - 2013 ANSI/ASME18.6 80° Dimensions of Flat Coutersunk Trim head Screws
Thread Size
d
4# 5# 6# 6# 8# 8# 10# 12#
d Nominal Size
PP UNC
Code Head Size
d1 max
min
(Type A) max
(Other types) min
dk max
min
k Ref
0.1120 0.1250 0.1380 0.1380 0.1640 0.1640 0.1900 0.2160
40 40 32 32 32 32 24 24
3 4 4 5 5 6 8 8
0.112 0.125 0.138 0.138 0.164 0.164 0.190 0.216
0.106 0.119 0.131 0.131 0.157 0.157 0.181 0.207
0.105 0.118 0.131 0.131 0.157 0.157 0.183 0.209
0.106 0.119 0.131 0.131 0.157 0.157 0.181 0.207
0.187 0.212 0.212 0.237 0.237 0.262 0.312 0.312
0.167 0.191 0.191 0.215 0.215 0.238 0.285 0.285
0.052 0.060 0.052 0.068 0.052 0.069 0.085 0.069
Thread Size
d
12# 14# 14# 1/4 1/4 5/16 5/16 3/8
d Nominal Size
PP UNC
Code Head Size
d1 max
min
(Type A) max
(Other types) min
dk max
min
k Ref
0.2160 0.2420 0.2420 0.2500 0.2500 0.3125 0.3125 0.3750
24 - - 20 20 18 18 16
10 10 12 10 12 12 1/4 9/16
0.216 - - 0.250 0.250 0.312 0.312 0.375
0.207 - - 0.240 0.240 0.302 0.302 0.364
0.209 0.235 0.235 - - - - -
0.207 - - 0.240 0.240 0.302 0.302 0.364
0.362 0.362 0.412 0.362 0.412 0.412 0.477 0.597
0.333 0.333 0.380 0.333 0.380 0.380 0.442 0.556
0.101 0.080 0.112 0.080 0.112 0.075 0.116 0.155
①,Edge of head may be rounded or flat.
②,Short machine screws include nominal lengths up to and including 1 1/8 in. for sizes No.5 and smaller, and 2 in. for sizes No.6 and larger.
③,Short tapping screws are those threaded full length. Refer to para. 4.3 for applicable screw lengths.
④,Size 14 is for tapping screws only.
⑤,Maximum diameter shall not exceed minimum plus 0.011 in. for Type A tapping screws, and basic screw diameter for all other tapping screw types.
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