Consolidated Tech Man - Holo-Krome

TABLE 32 ALLEN WRENCHES AND BITS
MECHANICAL PROPERTIES
Standard Allen Wrenches and Bits are manufactured from Holo-Krome
Alloy Steel, hardened by quenching in oil from the hardening temperature
TABLE 32
MECHANICAL PROPERTIES ALLEN WRENCHES APPLICATION DATA
NOMINAL
KEY OR BIT
SIZE
40
0.028
0.035
0.050
1/16
5/64
3/32
7/64
1/8
9/64
5/32
3/16
7/32
1/4
5/16
3/8
7/16
1/2
9/16
5/8
3/4
7/8
1
TORSIONAL
SHEAR
AVERAGE
(INCH-POUNDS)
1.1
2.3
6.5
11.9
25.0
43.0
68.0
98.0
146.0
195.0
342.0
535.0
770.0
1,600.0
2,500.0
4,500.0
6,300.0
8,750.0
12,000.0
19,500.0
29,000.0
43,500.0
NOTES FOR TABLE 32
TORQUE
RATING
(INCH-POUNDS)
0.9
1.8
5.3
10.3
20.0
35.0
55.0
82.0
118.0
160.0
278.0
440.0
655.0
1,275.0
2,200.0
3,500.0
5,200.0
6,500.0
9,000.0
15,500.0
24,600.0
28,800.0
NOMINAL
KEY OR BIT
SIZE
0.028
0.035
0.050
1/16 0.062
5/64 0.078
3/32 0.094
7/64 0.109
1/8 0.125
9/64 0.141
5/32 0.156
3/16 0.188
7/32 0.219
1/4 0.250
5/16 0.312
3/8 0.375
7/16 0.438
1/2 0.500
9/16 0.562
5/8 0.625
3/4 0.750
7/8 0.875
1 1.000
CAP SCREWS
1960 SERIES
—
—
0
1
2 & 3
4 & 5
6
—
8
10
1/4
—
5/16
3/8
7/16 & 1/2
—
5/8
—
3/4
7/8 & 1
1-1/8 & 1-1/4
1-3/8 & 1-1/2
TORSIONAL SHEAR STRENGTH. The average torsional shear strength
tabulated above is the average maximum torque which standard keys and
bits will transmit when tested to destruction. When so tested, failure
should occur by a clean, square shear fracture.
TORQUE RATING. Standard Allen Wrenches cut into bits for use in
torque wrenches will transmit the above torques.
and tempered to a minimum hardness of HRC 45 at the surface to provide
the following torsional properties:
FLAT
COUNTERSUNK
HEAD
CAP SCREWS
—
0
1 & 2
3 & 4
5 & 6
8
—
10
—
1/4
5/16
3/8
7/16
1/2
5/8
—
3/4
7/8
1
1-1/8
1-1/4 & 1-3/8
1-1/2
BUTTON
HEAD
CAP SCREWS
NOMINAL SCREW SIZES
—
0
1 & 2
3 & 4
5 & 6
8
—
10
—
1/4
5/16
3/8
—
1/2
5/8
—
—
—
—
—
—
—
SHOULDER
SCREWS
—
—
—
—
—
—
—
1/4
—
5/16
3/8
—
1/2
5/8
3/4
—
1
—
1-1/4
—
1-1/2
1-3/4
SET
SCREWS
0
1 & 2
3 & 4
5 & 6
8
10
—
1/4
—
5/16
3/8
7/16
1/2
5/8
3/4
—
7/8
1 & 1-1/8
1-1/4 & 1-3/8
1-1/2
—
1-3/4 & 2
PRESSURE
PLUGS
—
—
—
—
—
—
—
—
—
1/16
1/8
—
1/4
3/8
1/2
—
—
3/4
1
1-1/4
—
1-1/2, 2
These torque values are the average torque required to develop a
permanent visible twist of not more than 10° in bits which have one inch
of hexagon exposed between the torque wrench and the socket. These
are also the torque values which keys transmit when the short arm is
inserted in a socket and the long arm is deflected or bent through an angle
of 25 to 30° by the application of force near the end of the long arm. These
are the torque ratings from Federal Specification GGG-K-275D, Amend.
1.