Table 7.4.2.0: (b). Design Mechanical and Physical Properties of MP159 Alloy Bar
MIL-HDBK-5J, Metallic Materials and Elements for Aerospace Vehicle Structures
Last Updated 29 Oct 2026
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Specification
AMS 5843
Form
Bar
Condition
Solution treated, cold drawn, and aged
Diameter, in.a
≤0.500
0.501-0.800
0.801-1.750
Basis
A
B
A
B
S
Mechanical Properties:
Ftu ksi:
L
260b
269
260b
269
260
LT
…
…
"
…
…
Fty, ksi:
L
250c
262
250c
262
250
LT
…
…
…
…
…
Fcy, ksi:
L
…
:
…
…
…
LT
…
…
…
…
…
Fsu, ksi:
131
144
…
…
…
Fbru, ksi:
(e/D = 1.5)
…
…
…
…
…
(e/D = 2.0)
…
…
…
…
…
Fbry, ksi:
(e/D = 1.5)
…
…
…
…
…
(e/D = 2.0)
…
…
…
…
…
e, percent (S basis):
L
6
…
6
…
6
RA, percent (S basis):
L
32
…
32
…
32
E, 103 ksi
35.3
Ec, 103 ksi
…
G, 103 ksi
…
…
11.3
…
…
μ
0.37 (solution treated condition)
Physical Properties:
ω, lb/in.3
0.302
C and K
α, 10-6 in./in./°F
See Figure 7.4.2.0
a Tensile specimens are located at T/2 location for bars 0.800 inch and under in diameter or distance between parallel sides and at T/4 location for larger size bars. The strength of bar, especially large diameter, may vary machining parts from bars over 0.800-inch in diameter since strengths may be lower than design values depending on depth of material removed from surface.
b S-Basis. The rounded T99 value of 265 ksi is higher than specification minimum.
c S-Basis. The rounded T99 value of 253 ksi is higher than specification minimum.
MIL-HDBK-5J
7.4.2.0 (c). Design Mechanical and Physical Properties of MP159 Alloy Bar
Specification
AMS 5842
Form
Bar
Condition
Solution treated, cold drawn, and aged
Diameter, in.a
≤0.500
0.501-1.750
Basis
S
S
Mechanical Properties:
Ftu, ksi:
L
260
260
LT
Fty, ksi:
L
250
250
LT
Fcy, ksi:
L
LT
Fsu, ksi
131
Fbru, ksi:
(e/D = 1.5)
(e/D = 2.0)
Fbry, ksi:
(e/D = 1.5)
(e/D = 2.0)
e, percent:
L
6
6
RA, percent:
L
32
32
E, 103 ksi
35.3
Ec, 103 ksi
G, 103 ksi
11.3
μ
0.37 (solution treated condition)
Physical Properties:
ω, lb/in.3
0.302
C and K
α, 10-6 in./in./°F
See Figure 7.4.2.0
a Tensile specimens are located at T/2 location for bars 0.800 inch and under in diameter or distance between parallel sides and at T/4 location for larger size bars. The strength of bar, especially large diameter may vary significantly from center to surface; consequently, caution should be exercised in machining parts from bars over 0.800 inch in diameter since strengths may be lower than design values depending on depth of material removed from surface.