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Flat Head Cap Screws

 

Recommended for flush fastening of plates, access panels, and hinges, these heat treated alloy steel screws have an 82° counter sunk head. Available in coarse and fine thread. Stocked in diameters from #0/80 to 1 1/2" and lengths up to 8".

Group codes represented: FLSCS
Part# examples: 31U150FLSCS, 37S200FLSCS

 

Nom-inal Size
D
A
H
J
T
F
Tensile Strength, Lbs. Min
Single Shear Strength of Body
Recommended Seating Torques, in./lbs.
Body Diameter
Head Diameter
Head Height
Hex Socket Size
Key Engage-ment
Fillet Transi-tion Diameter
Max
Min
Theoretical Sharp Max
Abs. Min
Ref
Flushness Tolerance
Nom
Min
Max
UNRC
UNRF
lbs., Min
Coarse Thread
Fine Thread
4
0.1120
0.1075
0.2550
0.2180
0.0830
0.0110
1/16
0.0550
0.1360
900
....
940
8
....
5
0.125
0.1202
0.2810
0.2400
0.0900
0.0120
5/64
0.0610
0.1530
1185
....
1180
12
....
6
0.1380
0.1329
0.3070
0.2630
0.0970
0.0130
5/64
0.0660
0.1680
1350
....
1440
15
....
8
0.1640
0.1585
0.3590
0.3110
0.1120
0.0140
3/32
0.0760
0.1940
2085
....
2030
30
....
10
0.1900
0.1840
0.4110
0.3590
0.1270
0.0150
1/8
0.0870
0.2200
2610
2610
2720
40
45
1/4
0.2500
0.2435
0.5310
0.4800
0.1610
0.0160
5/32
0.1110
0.2800
4750
4750
4710
100
110
5/16
0.3125
0.3053
0.6560
0.6000
0.1980
0.0170
3/16
0.1350
0.3430
7800
7800
7360
200
220
3/8
0.3750
0.3678
0.7810
0.7200
0.2340
0.0180
7/32
0.1590
0.4050
11600
11600
10600
350
400
7/16
0.4375
0.4294
0.8440
0.7810
0.2340
0.0180
1/4
0.1590
0.4680
15900
15900
14400
560
....
1/2
0.5000
0.4919
0.9380
0.8720
0.2510
0.0180
5/16
0.1720
0.5300
21200
21200
18850
850
1000
5/8
0.6250
0.6163
1.1880
1.1120
0.3240
0.0220
3/8
0.2200
0.6550
33800
33800
29450
1700
....
3/4
0.7500
0.7406
1.4380
1.3550
0.3960
0.0240
1/2
0.2200
0.7800
50000
50000
42400
3000
....
Tolerance on Length
Nominal Screw Size
Nominal Screw Length
Up to 1 in., Incl.
Over 1 in. to 2-1/2 in., Incl.
Over 2-1/2 in. to 3 in., Incl.
0 thru 3/8, Inclusive
-0.03
-0.04
-0.06
1/2 thru 3/4, Inclusive
-0.03
-0.06
-0.08

 

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