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Big-Sert Inch Engineering Data

INSERT

DRILL

C.BORE

TAP

SIZE

DRILL
SIZE

MIN.
DIA

MIN.
DEPTH

MAJOR
DIA.

1/4-20
7.8mm
.307
.355
.050
.359
1/4-28
L
.290
.330
.055
.330
5/16-18
13/32
.406
.474
.085
.474
5/16-24
13/32
.406
.474
.085
.474
3/8-16
31/64
.484
.552
.085
.552
3/8-24
31/64
.484
.552
.085
.552
7/16-14
37/64
.578
.634
.085
.634
7/16-20
37/64
.578
.634
.085
.634
1/2-13
41/64
.640
.701
.085
.701
1/2-20
41/64
.640
.701
.085
.701