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Unit:inch

Square Recessed Mushroom Head Screws

ASME B 18.6.3 (T25-III) - 2013

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美标ASME B18.6.3 (T25-III) - 2013 ASME18.6 Square Recessed Mushroom Head Screws
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Thread Size
d
2# 3# 4# 5# 6# 7# 8# 10# 12#
d Nominal Size
PP
Socket No.
M Ref.
P max
min
dk max
min
k max
min
R max
0.0860 0.0990 0.1120 0.1250 0.1380 0.1510 0.1640 0.1900 0.2160
56 48 40 40 32 / 32 24 24
00 0 0 1S 1S 1S 2S 2R 3S
0.050 0.070 0.070 0.091 0.091 0.091 0.112 0.112 0.133
0.033 0.038 0.038 0.055 0.055 0.055 0.063 0.075 0.080
0.028 0.028 0.028 0.040 0.040 0.040 0.048 0.060 0.065
0.194 0.226 0.257 0.289 0.321 0.352 0.384 0.448 0.511
0.180 0.211 0.241 0.272 0.303 0.333 0.364 0.425 0.487
0.053 0.061 0.069 0.078 0.086 0.094 0.102 0.118 0.134
0.044 0.051 0.059 0.066 0.074 0.081 0.088 0.103 0.118
0.129 0.151 0.169 0.191 0.211 0.231 0.254 0.283 0.336
Thread Size
d
14# 1/4 16# 18# 5/16 20# 24# 3/8
d Nominal Size
PP
Socket No.
M Ref.
P max
min
dk max
min
k max
min
R max
0.2420 0.2500 0.2680 0.2940 0.3125 0.3200 0.3720 0.3750
/ 20 / / 18 / / 16
3S 3S 4R 4R 4R 4R 4R 4R
0.133 0.133 0.191 0.191 0.191 0.191 0.191 0.191
0.080 0.080 0.100 0.100 0.100 0.100 0.100 0.100
0.065 0.065 0.085 0.085 0.085 0.085 0.085 0.085
0.557 0.573 0.609 0.661 0.698 0.713 0.817 0.823
0.530 0.546 0.580 0.630 0.666 0.680 0.780 0.787
0.146 0.150 0.159 0.173 0.183 0.186 0.213 0.215
0.129 0.133 0.141 0.153 0.162 0.165 0.190 0.191
0.375 0.375 0.410 0.446 0.457 0.484 0.557 0.538
①,Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted.
②,“R" in the recess size tabulation means regular depth recess, and "S" means short depth recess.
③,Sizes 7, 14, 16, 18, 20, and 24 are for tapping screws only.
④,Square recesses incorporate a slight taper on the sides of the recess. This taper can result in loss of penetration gaging depth on finished fasteners due to the build up of plating in the recesses. The recess penetration dimensions specified here are for finished (plated) product. Manufacturers should be advised that they should not use all this tolerance in the heading process, or an out-of-tolerance condition could exist after plating.
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