Machinery's Handbook, 31st Edition
1822
Set Screws Table 12. American National Standard Square Head Set Screws ANSI/ASME B18.6.2-1998 (R2010)
Slight Fillet Permissible
L
L 35° +5° –0°
L
35° +5° –0°
Q 1
P
X
C
P
Slight Chamfer or Radius Permissible
Q
FLAT POINT
DOG POINT HALF DOG POINT
L
L
L
R
X
Slight Flat or Rounding Permissible
Y
118°±5°
C
Slight Flat Permissible
Slight Flat or Rounding Permissible
CUP POINT
OVAL POINT
CONE POINT
Oval Point Rad., R
Cup and Flat Point Diams., C
Dog and Half Dog Point Diams., P
Point Length
Nominal Size * or Basic Screw Diameter
Dog, Q
Half Dog, Q 1
+.031 − .000
Max. .102 .132 .172 .212 .252 .291 .332 .371 .450 .530 .609 .689 .767 .848 .926
Min .088 .118 .156 .194 .232 .270 .309 .347 .425 .502 .579 .655 .733 .808 .886
Max.
Min.
Max.
Min. .085 .120 .151 .183 .214 .245 .275 .305 .367 .430 .490 .552 .615 .678 .740
Max. .050 .068 .083 .099 .114 .130 .146 .164 .196 .227 .260 .291 .323 .354 .385
Min. .040 .058 .073 .089 .104 .120 .134 .148 .180 .211 .240 .271 .303 .334 .365
10
0.1900 0.2500 0.3125 0.3750 0.4375
.127 .156 .203 .250 .297 .344 .391 .469 .562 .656 .750 .844 .938
.120 .095 .149 .130 .195 .161 .241 .193 .287 .224 .334 .255 .379 .287 .456 .321 .549 .383 .642 .446 .734 .510 .826 .572 .920 .635 1.011 .698 1.105 .760
.142 .188 .234 .281 .328 .375 .422 .469 .562 .656 .750 .844 .938
1 ∕ 4
5 ∕ 16
3 ∕ 8
7 ∕ 16
0.500
1 ∕ 2
0.5625 0.6250 0.7500 0.8750 1.0000 1.1250 1.2500 1.3750 1.5000
9 ∕ 16
5 ∕ 8 3 ∕ 4 7 ∕ 8
1
1 1 ∕ 8 1 1 ∕ 4 1 3 ∕ 8 1 1 ∕ 2
1.031 1.125
1.031 1.125
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. Length of Thread: Square head set screws have complete (full form) threads extending over that portion of the screw length which is not affected by the point. For the respective constructions, threads extend into the neck relief, to the conical underside of head, or to within one thread (as measured with a thread ring gage) from the flat underside of the head. Threads through angular or crowned portions of points have fully formed roots with partial crests. * When specifying a nominal size in decimals, the zero preceding the decimal point is omitted as is any zero in the fourth decimal place.
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