Machinery's Handbook, 31st Edition
Cap Screws 1813 Table 2. American National Standard Slotted Round Head Cap Screws ANSI/ASME B18.6.2-1998 (R2010)
T
E
J
U
H
L
A
Body Diameter, E
Head Diameter, A
Head Height, H
Slot Width, J
Slot Depth, T
Nom. Size a or Basic Screw Diameter
Max.
Min.
Max. .437 .562 .625 .750 .812 .937
Min. .418 .540 .603 .725 .786 .909 .970
Max. .191 .245 .273 .328 .354 .409 .437 .546
Min. .175 .226 .252 .302 .327 .378 .405 .507
Max. .075 .084 .094 .094 .106 .118 .133 .149
Min. .064
Max.
Min.
0.2500 .2500 .2450 0.3125 .3125 .3070 0.3750 .3750 .3690 0.4375 .4375 .4310 0.5000 .5000 .4930 0.5625 .5625 .5550
.117 .097
1 ∕ 4
.072 .151 .126 .081 .168 .138 .081 .202 .167 .091 .218 .178 .102 .252 .207
5 ∕ 16
3 ∕ 8
7 ∕ 16
1 ∕ 2
9 ∕ 16
0.6250 .6250 .6170 1.000
.116
.270 .220
5 ∕ 8 3 ∕ 4
0.7500 .7500 .7420 1.250 1.215 .131 .338 .278 a When specifying a nominal size in decimals, the zero preceding the decimal point is omitted as is any zero in the fourth decimal place. All dimensions are in inches. Fillet Radius, U : For fillet radius see foonote to table below. Threads: Threads are Unified Standard Class 2A; UNC, UNF and 8 UN Series or UNRC, UNRF and 8 UNR Series. Table 3. American National Standard Slotted Fillister Head Cap Screws ANSI/ASME B18.6.2-1998 (R2010)
T
E
J
U
H
A
O
L
Head Side Height, H
Total Head Height, O
Body Dia., E
Head Dia., A
Slot Width, J
Slot Depth, T
Nom. Size a or Basic Screw Dia.
Max.
Min.
Max.
Min.
Max.
Min. Max. Min. Max. Min. Max. Min.
1 ∕ 4 0.2500 .2500 .2450 .375 .363 .172 .157 .216 .194 .075 .064 .097 .077 5 ∕ 16 0.3125 .3125 .3070 .437 .424 .203 .186 .253 .230 .084 .072 .115 .090 3 ∕ 8 0.3750 .3750 .3690 .562 .547 .250 .229 .314 .284 .094 .081 .142 .112 7 ∕ 16 0.4375 .4375 .4310 .625 .608 .297 .274 .368 .336 .094 .081 .168 .133 1 ∕ 2 0.5000 .5000 .4930 .750 .731 .328 .301 .413 .376 .106 .091 .193 .153 9 ∕ 16 0.5625 .5625 .5550 .812 .792 .375 .346 .467 .427 .118 .102 .213 .168 5 ∕ 8 0.6250 .6250 .6170 .875 .853 .422 .391 .521 .478 .133 .116 .239 .189 3 ∕ 4 0.7500 .7500 .7420 1.000 .976 .500 .466 .612 .566 .149 .131 .283 .223 7 ∕ 8 0.8750 .8750 .8660 1.125 1.098 .594 .556 .720 .668 .167 .147 .334 .264 1 1.0000 1.0000 .9900 1.312 1.282 .656 .612 .803 .743 .188 .166 .371 .291 a When specifying nominal size in decimals, the zero preceding the decimal point is omitted as is any zero in the fourth decimal place. All dimensions are in inches. Fillet Radius, U : The fillet radius is as follows: For screw sizes 1 ∕ 4 to 3 ∕ 8 incl., .031 max. and .016 min.; 7 ∕ 16 to 9 ∕ 16 , incl., .047 max., .016 min.; and for 5 ∕ 8 to 1, incl., .062 max., .031 min. Threads: Threads are Unified Standard Class 2A; UNC, UNF and 8 UN Series or UNRC, UNRF and 8 UNR Series.
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