INCH-POUND
MS24672B
2 June 2006
SUPERSEDING MS24672A
27 March 1961
DETAIL SPECIFICATION SHEET
SCREW, CAP, SOCKET HEAD, FLAT COUNTERSUNK, CORROSION RESISTING STEEL, UNF-3A
Inactive for new design after 27 March 1961
This specification is approved for use by all Departments and Agencies of the Department of
Defense.
The requirements for acquiring the product described herein shall consist of this specification sheet and FF-S-86.
R SEE NOTE 5 ON SCREW POINT CHAMFER
A
THEORETICAL SHARP MAX.
J
82° ±2°
T REFERENCE H
MAX.
SEE NOTE 4 ON
MINIMUM THREAD D LENGTH
L
A
T
(ABSOLUTE MINIMUM WITH FLAT)
FIGURE 1. Screw
TABLE I. Screw Dash Numbers and Dimensions
NOMINAL SIZE |
#10 (.190) |
.250 |
.313 |
.375 |
.500 |
|
THREADS PER INCH |
32UNF-3A |
28UNF-3A |
24UNF-3A |
24UNF-3A |
20UNF-3A |
|
D BODY DIAMETER MAX MIN |
.190 .1867 |
.250 .2464 |
.3125 .3084 |
.375 .3705 |
.500 .4948 |
|
A HEAD DIAMETER THEO. SHARP MAX ABS. MIN |
.411 .359 |
.531 .480 |
.656 .600 |
.781 .720 |
.937 .872 |
|
H HEAD HEIGHT REFERENCE MAX |
.127 |
.161 |
.198 |
.234 |
.251 |
|
J SOCKET WIDTH ACROSS FLATS MAX MIN |
.1270 .1250 |
.1582 .1562 |
.1895 .1875 |
.2207 .2187 |
.3155 .3125 |
|
T KEY ENGAGEMENT MIN |
.087 |
.111 |
.135 |
.159 |
.172 |
|
R RADIUS MAX |
.019 |
.025 |
.031 |
.037 |
.050 |
|
MINIMUM BREAKING STRENGTH LBS. |
1400 |
2550 |
4060 |
6150 |
11200 |
|
L LENGTH |
TOL. |
DASH NO. |
DASH NO. |
DASH NO. |
DASH NO. |
DASH NO. |
.375 .500 .625 .750 1.000 |
+.016 - .016 |
1 2 3 4 5 6 7 |
9 10 11 12 13 14 15 |
17 18 19 20 21 22 23 |
25 26 27 28 29 30 |
32 33 34 35 36 37 |
1.250 1.500 1.750 2.000 |
+.031 - .016 |
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AMSC FSC 5305
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