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Counterbored Holes for Socket-Head
Cap Screws (USA)


SCREW
DIA
A
COUNTERBORE
DIA
B
COUNTERBORE
DEPTH
C
COUNTERSINK
DIA
D
CLEARANCE DIA
NORMAL FIT CLOSE FIT
#0 1/8 .060 .074 #49 #51
#2 3/16 .086 .102 #36 3/32
#4 7/32 .112 .130 #29 1/8
#5 1/4 .125 .145 #23 9/64
#6 9/32 .138 .158 #18 #23
#8 5/16 .164 .188 #10 #15
#10 3/8 .190 .218 #2 #5
1/4 7/16 .250 .278 9/32 17/64
5/16 17/32 .312 .346 11/32 21/64
3/8 5/8 .375 .415 13/32 25/64
7/16 23/32 .438 .483 15/32 29/64
1/2 13/16 .500 .552 17/32 33/64
5/8 1 .625 .689 21/32 41/64
3/4 1-3/16 .750 .828 25/32 49/64
7/8 1-3/8 .875 .963 29/32 57/64
1 1-5/8 1.000 1.100 1-1/32 1-1/64
1-1/4 2 1.250 1.370 1-5/16 1-9/32
1-1/2 2-3/8 1.500 1.640 1-9/16 1-17/32
1-3/4 2-3/4 1.750 1.910 1-13/16 1-25/32
2 3-1/8 2.000 2.180 2-1/16 2-1/32
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