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DIN 7991 Flat Head Socket Screw
Socket Cap Screws
UNC/UNF
*Flat Head Countersunk
S325-UNC/UNF Bare Steel
ANSI/ASME B18.3 2003
Diameter - UNC
#6-32
#8-32
#10-24
1/4-20
5/16-18
3/8-16
7/16-14
1/2-13
5/8-11
3/4-10
7/8-9
1-8
Diameter Code
006
008
010
014
016
018
020
024
026
028
030
034
t
.066
.076
.087
.111
.135
.159
.159
.172
.220
.220
.248
.297
s
5/64
3/32
1/8
5/32
3/16
7/32
1/4
5/16
3/8
1/2
9/16
5/8
.078
.094
.125
.156
.188
.219
.250
.312
.375
.500
.562
.625
k max.
.097
.112
.127
.161
.198
.234
.234
.251
.324
.396
.468
.540
d1 max.
.307
.359
.411
.531
.656
.781
.844
.938
1.188
1.438
1.688
1.938
R.S. Torque (in-lb)
16.5
30.1
43.7
104
215
382
611
931
1722
3054
4928
7388
Length
Code
Pkg.
1/4
0025
100
100
5/16
0031
100
3/8
0038
100
100
100
100
100
1/2
0050
100
100
100
100
100
100
5/8
0063
100
100
100
100
100
100
3/4
0075
100
100
100
100
100
100
100
100
7/8
0088
100
1
0100
100
100
100
100
100
100
100
100
50
1-1/4
0125
100
100
100
100
100
100
100
50
25
1-1/2
0150
100
100
100
100
100
100
100
50
25
1-3/4
0175
100
100
100
100
100
100
50
50
25
2
0200
100
100
100
100
100
100
50
50
50
25
2-1/4
0225
100
100
100
50
25
25
2-1/2
0250
100
100
100
100
50
50
25
25
3
0300
100
100
100
50
50
25
25
25
3-1/2
0350
100
100
50
50
25
25
4
0400
100
100
100
50
25
25
25
10
4-1/2
0450
50
50
25
25
5
0500
50
50
25
25
10
6
0600
50
50
25
25
Diameter - UNF
10-32
1/4-28
5/16-24
3/8-24
1/2-20
Diameter Code
010
014
016
018
024
t
.087
.111
.135
.159
.172
s
1/8
5/32
3/16
7/32
5/16
.125
.156
.188
.219
.312
k max.
.127
.161
.198
.234
.251
d1 max.
.411
.531
.656
.781
.938
R.S. Torque (in-lb)
43.7
104
215
382
931
Length
Code
Pkg.
1/4
0025
100
3/8
0038
100
100
1/2
0050
100
100
100
5/8
0063
100
100
100
3/4
0075
100
100
100
100
100
1
0100
100
100
100
100
100
1-1/4
0125
100
100
100
100
100
1-1/2
0150
100
100
100
100
100
1-3/4
0175
100
100
100
2
0200
100
100
100
100
Order Number -> 1/4 x 2-1/2 UNC = S325-014-0250 (Diameter Code x Length Code)(Fine Thread add -F)