Machinery's Handbook, 31st Edition
Set Screws
1823
Table 13. American National Standard Square Head Set Screws ANSI/ASME B18.6.2-1998 (R2010)
U S K
L
H
H
H
G
U
K
100° 110°
F
W
OPTIONAL HEAD CONSTRUCTIONS
Neck Relief Fillet Rad., S
Neck Relief Width, U
Head Rad., W
Width Across Flats, F
Width Across Corners, G
Head Height, H
Neck Relief Diameter, K
Nominal Size a or Basic Screw Diameter
Max. Min. Max. Min. Max. Min. Max. Min.
Max.
Min. .083 .100 .111 .125 .143 .154 .167 .182 .200 .222 .250 .283 .283 .333 .333
Min. 0.48 0.62 0.78 0.94 1.09 1.25 1.41 1.56 1.88 2.19 2.50 2.81 3.12 3.44
10 0.1900 .188 .180 .265 .247 .148 .134 .145 .140 .027 1 ∕ 4 0.2500 .250 .241 .354 .331 .196 .178 .185 .170 .032 5 ∕ 16 0.3125 .312 .302 .442 .415 .245 .224 .240 .225 .036 3 ∕ 8 0.3750 .375 .362 .530 .497 .293 .270 .294 .279 .041 7 ∕ 16 0.4375 .438 .423 .619 .581 .341 .315 .345 .330 .046 1 ∕ 2 0.5000 .500 .484 .707 .665 .389 .361 .400 .385 .050 9 ∕ 16 0.5625 .562 .545 .795 .748 .437 .407 .454 .439 .054 5 ∕ 8 0.6250 .625 .606 .884 .833 .485 .452 .507 .492 .059 3 ∕ 4 0.7500 .750 .729 1.060 1.001 .582 .544 .620 .605 .065 7 ∕ 8 0.8750 .875 .852 1.237 1.170 .678 .635 .731 .716 .072 1 1.0000 1.000 .974 1.414 1.337 .774 .726 .838 .823 .081 1 1 ∕ 8 1.1250 1.125 1.096 1.591 1.505 .870 .817 .939 .914 .092 1 1 ∕ 4 1.2500 1.250 1.219 1.768 1.674 .966 .908 1.064 1.039 .092 1 3 ∕ 8 1.3750 1.375 1.342 1.945 1.843 1.063 1.000 1.159 1.134 .109
1 1 ∕ 2 1.5000 1.500 1.464 2.121 2.010 1.159 1.091 1.284 1.259 .109 3.75 Designation: Square head set screws are designated by the following data in the sequence shown: Nominal size (number, fraction or decimal equivalent); threads per inch; screw length (fraction or decimal equivalent); product name; point style; material; and protective finish, if required. Exam ples: 1 ∕ 4 - 20 × 3 ∕ 4 Square Head Set Screw, Flat Point, Steel, Cadmium Plated. .500 − 13 × 1.25 Square Head Set Screw, Cone Point, Corrosion Resistant Steel. Cone Point Angle, Y : For the following nominal lengths, or longer, shown according to nominal size, the cone point angle is 90 ° ± 2 ° : For size No. 10, 1 ∕ 4 ; 1 ∕ 4 , 5 ∕ 16 ; 5 ∕ 16 , 3 ∕ 8 ; 3 ∕ 8 , 7 ∕ 16 ; 7 ∕ 16 , 1 ∕ 2 ; 1 ∕ 2 , 9 ∕ 16 ; 9 ∕ 16 , 5 ∕ 8 ; 5 ∕ 8 , 3 ∕ 4 ; 3 ∕ 4 , 7 ∕ 8 ; 7 ∕ 8 , 1; 1, 1 1 ∕ 8 ; 1 1 ∕ 8 , 1 1 ∕ 4 ; 1 1 ∕ 4 , 1 1 ∕ 2 ; 1 3 ∕ 8 , 1 5 ∕ 8 ; and for 1 1 ∕ 2 , 1 3 ∕ 4 . For shorter screws the cone point angle is 118 ° ± 2 ° . Point Types: Unless otherwise specified, square head set screws are supplied with cup points. Cup points as furnished by some manufacturers may be externally or internally knurled. Where so specified by the purchaser, screws have cone, dog, half-dog, flat or oval points as given on the following page. Point Angle, X : The point angle is 45 ° , + 5 ° , − 0 ° for screws of the nominal lengths, or longer, given just above for cone point angle, and 30 ° min. for shorter lengths.
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