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Unit:inch

Undercut Oval 82-deg Countersunk Head Screws, Type III Recess

ASME B 18.6.3 (T12-III) - 2013

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美标ASME B18.6.3 (T12-III) - 2013 ASME18.6 Undercut Oval 82-deg Countersunk Head Screws, Type III Recess
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Thread Size
d
2# 3# 4# 5# 6# 7# 8# 10# 12#
d
PP
Socket No.
M Ref.
P max
min
dk max
min
k Ref.
f Ref.
α max
min
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 1R 1R 1R 2R 2R 3R
0.050 0.070 0.070 0.091 0.091 0.091 0.112 0.112 0.133
0.033 0.038 0.038 0.065 0.065 0.065 0.075 0.075 0.095
0.028 0.028 0.028 0.050 0.050 0.050 0.060 0.060 0.080
0.162 0.187 0.212 0.237 0.262 0.287 0.312 0.362 0.412
0.144 0.167 0.191 0.215 0.238 0.262 0.285 0.333 0.380
0.036 0.042 0.047 0.053 0.059 0.064 0.070 0.081 0.092
0.029 0.033 0.037 0.041 0.045 0.049 0.052 0.060 0.068
82° 82° 82° 82° 82° 82° 82° 82° 82°
80° 80° 80° 80° 80° 80° 80° 80° 80°
Thread Size
d
14# 1/4 16# 18# 5/16 20# 24# 3/8
d
PP
Socket No.
M Ref.
P max
min
dk max
min
k Ref.
f Ref.
α max
min
0.2420 0.2500 0.2680 0.2940 0.3125 0.3200 0.3720 0.3750
/ 20 / / 18 / / 16
3R 3R 3R 4R 4R 4R 4R 4R
0.133 0.133 0.133 0.191 0.191 0.191 0.191 0.191
0.095 0.095 0.095 0.100 0.100 0.100 0.100 0.100
0.080 0.080 0.080 0.085 0.085 0.085 0.085 0.085
0.462 0.477 0.512 0.561 0.597 0.611 0.711 0.717
0.427 0.442 0.475 0.522 0.556 0.569 0.664 0.670
0.104 0.107 0.115 0.126 0.134 0.137 0.160 0.161
0.076 0.079 0.084 0.092 0.099 0.100 0.116 0.117
82° 82° 82° 82° 82° 82° 82° 82°
80° 80° 80° 80° 80° 80° 80° 80°
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.
④,Sizes 7 is for tapping screws only.
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Similar Standards

1 Metric square slot raised countersunk head screws [ASME/ANSI]
ASME/ANSI B 18.6.7M - 1998 		Metric square slot raised countersunk head screws
2 Square recessed raised countersunk head screws - Type III [Table 7&8] [ASME]
ASME B 18.6.3 (T8-III) - 2013 		Square recessed raised countersunk head screws - Type III [Table 7&8]