Machinery's Handbook, 31st Edition
1812
Cap Screws CAPANDSETSCREWS
Slotted Head Cap Screws.— American National Standard ANSI/ASME B18.6.2-1998 (R2010) is intended to cover the complete general and dimensional data for the various styles of slotted head cap screws as well as square head and slotted headless set screws (see page 1819 ). Reference should be made to this Standard for information or data not found in the following text or tables. Length of Thread: The length of complete (full form) thread on cap screws is equal to twice the basic screw diameter plus 0.250 in. with a plus tolerance of 0.188 in. or an amount equal to 2 1 ∕ 2 times the pitch of the thread, whichever is greater. Cap screws of lengths too short to accommodate the minimum thread length have full form threads extending to within a distance equal to 2 1 ∕ 2 pitches (threads) of the head. Designation: Slotted head cap screws are designated by the following data in the sequence shown: Nominal size (fraction or decimal equivalent); threads per inch; screw length (frac - tion or decimal equivalent); product name; material; and protective finish, if required. Ex - amples: 1 ⁄ 2 -13 × 3 Slotted Round Head Cap Screw, SAE Grade 2 Steel, Zinc Plated. .750-16 × 2.25 Slotted Flat Countersunk Head Cap Screw, Corrosion Resistant Steel. Table 1. American National Standard Slotted Flat Countersunk Head Cap Screws ANSI/ASME B18.6.2-1998 (R2010)
T
J
80° 82°
E
U
B
H
L
Head Dia., A
Edge Rnd’d. or Flat
Nominal Size a or Basic Screw Dia.
Body Dia., E
Edge Sharp Max.
Head Hgt., H
Slot Width, J
Slot Depth, T
Fillet Rad., U
Max.
Min.
Min. .452 .567 .682 .736 .791 .906
Ref. .140 .177 .210 .210 .210 .244 .281 .352 .423 .494 .529 .600 .665 .742
Max.
Min.
Max.
Min.
Max. .100 .125 .150 .175 .200 .225 .250 .300 .350 .400 .450 .500 .550
0.2500 .2500 .2450 0.3125 .3125 .3070 0.3750 .3750 .3690 0.4375 .4375 .4310 0.5000 .5000 .4930
.500 .625 .750 .812 .875
.075 .064 .068 .045 .084 .072 .086 .057 .094 .081 .103 .068 .094 .081 .103 .068 .106 .091 .103 .068 .118 .102 .120 .080 .133 .116 .137 .091 .149 .131 .171 .115 .167 .147 .206 .138 .188 .166 .240 .162 .196 .178 .257 .173 .211 .193 .291 .197 .226 .208 .326 .220
1 ∕ 4
5 ∕ 16
3 ∕ 8
7 ∕ 16
1 ∕ 2
0.5625 .5625 .5550 1.000
9 ∕ 16
0.6250 .6250 .6170 1.125 1.020 0.7500 .7500 .7420 1.375 1.251 0.8750 .8750 .8660 1.625 1.480 1.0000 1.0000 .9900 1.875 1.711 1.1250 1.1250 1.1140 2.062 1.880 1.2500 1.2500 1.2390 2.312 2.110 1.3750 1.3750 1.3630 2.562 2.340
5 ∕ 8 3 ∕ 4 7 ∕ 8
1
1 1 ∕ 8 1 1 ∕ 4 1 3 ∕ 8 1 1 ∕ 2
1.5000 1.5000 1.4880 2.812 2.570 .600 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. Threads: Threads are Unified Standard Class 2A; UNC, UNF and 8 UN Series or UNRC, UNRF, and 8 UNR Series. .258 .240 .360 .244
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