Specification Sheet

343
SOCKETS
Body and Grip lenGtHS oF Flat Head Socket cap ScrewS
ASME B18.3-
2012
Nominal Size
4 5 6 8 10 1/4
L
T
MIN.
.750 .750 .750 .875 .875 1.000
L
TT
MAX
0.99 1.00 1.05 1.19 1.27 1.50
Nominal
Length
Lgh Lbh Lgh Lbh Lgh Lbh Lgh Lbh Lgh Lbh Lgh Lbh
1.25
0.50 0.38 0.50 0.38 0.50 0.34 0.38 0.22
1.50
0.50 0.38 0.50 0.38 0.50 0.34 0.38 0.22 0.62 0.42
1.75
1.00 0.88 1.00 0.88 1.00 0.84 0.88 0.72 0.62 0.42 0.75 0.50
2.00
1.00 0.88 1.00 0.88 1.00 0.84 0.88 0.72 1.12 0.92 0.75 0.50
2.50
1.50 1.34 1.38 1.22 1.62 1.42 1.25 1.00
3.00
1.88 1.72 2.12 1.92 1.75 1.50
3.50
2.62 2.42 2.25 2.00
Nominal Size
5/16 3/8 7/16 1/2 5/8 3/4
L
T
MIN.
1.125 1.250 1.375 1.500 1.750 2.000
L
TT
MAX
1.71 1.94 2.17 2.38 2.82 3.25
Nominal
Length
Lgh Lbh Lgh Lbh Lgh Lbh Lgh Lbh Lgh Lbh Lgh Lbh
2.00 0.88 0.60
2.25 0.88 0.60 1.00 0.69
2.50 1.38 1.10 1.00 0.69 1.12 0.77 1.00 0.62
3.00 1.88 1.60 1.50 1.19 1.62 1.27 1.00 0.62
3.50 2.38 2.10 2.00 1.69 2.12 1.77 1.75 1.36 1.50 1.04 1.50 1.00
4.00 2.88 2.60 2.50 2.19 2.62 2.27 2.50 2.12 2.25 1.80 1.50 1.00
4.50 3.38 3.10 3.00 2.69 3.12 2.77 2.50 2.12 2.25 1.80 2.50 2.00
5.00 3.88 3.60 3.50 3.19 3.62 3.27 3.25 2.86 3.00 2.54 2.50 2.00
5.50 4.38 4.10 4.00 3.69 4.12 3.77 4.00 3.62 3.75 3.30 3.50 3.00
6.00 4.88 4.60 4.50 4.19 4.62 4.27 4.00 3.62 3.75 3.30 3.50 3.00
L
LT
LBH
LGH
LTT
For screws of nominal lengths longer than those for which L
GH
and L
BH
values tabulated in this table and for screws
over 1 inch in diameter, the maximum grip gaging length L
GH
and the minimum body length L
BH
of the screws shall be
determined as follows:
L
GH
= L - L
T
L
BH
= L - L
TT
where L = nominal length, L
T
= minimum thread length, and L
TT
= maximum total thread length.
Body & Grip Lengths
FLAT HEAD CAP SCREWS