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ASME B 18.6.3 (T22-III) - 2013 Square Recessed Raised Cheese Head Machine Screws


Unit:
Thread Size
d
2# 3# 4#
d Nominal Size
PP
Socket No.
M Ref.
P max
min
dk max
min
k1 max
min
k max
min
0.0860 0.0990 0.1120
56 48 40
00 0 0
0.050 0.070 0.070
0.033 0.038 0.038
0.028 0.028 0.028
0.140 0.161 0.183
0.124 0.145 0.166
0.062 0.070 0.079
0.053 0.061 0.069
0.083 0.095 0.107
0.066 0.077 0.088
①,Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted.
②,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.
③,“R" in the recess size tabulation means regular depth recess.
Alternative history ASME/ANSI B 18.6.3 - 2010 ASME B 18.6.3T22-III - 2013 ASME B 18.6.3H6B-III - 2024

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