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Physical Properties

Beryllium Copper Strip Products

Formability and Stress Relaxation 
NGK 165 (UNS C17000); 1.75 wt% Be, 0.25 wt% Co, Balance Cu
Temper
Standard
Temper
ASTM
Formability
(max R/t for
90° bend)
Good Way
Typical
Formability
(max R/t for
90° bend)
Bad Way
Typical
Stress
Relaxation
Resistance
1000 hr @
212°F (100°C)
Stress
Relaxation
Resistance
1000 hr @
392°F (200°C)
A
1/4H
1/2H
H
-
-
-
-
0
0
0
1.5
0
0
1
3
-
-
-
-
-
-
-
-
AT
1/4HT
1/2HT
HT
22
22
22
22
-
-
-
-
-
-
-
-
96
97
97
98
70
71
72
75
AM
1/4HM
1/2HM
HM
SHM
XHM
16
16
16
17
18
19
0
0.5
1
2
3
4
0
0.5
1
3
5
7
97
97
98
98
98
98
66
67
67
68
68
69
NGK 25 (UNS C17200); 1.85 wt% Be, 0.25 wt% Co, Balance Cu
Temper
Standard
Temper
ASTM
Formability
(max R/t for
90° bend)
Good Way
Typical
Formability
(max R/t for
90° bend)
Bad Way
Typical
Stress
Relaxation
Resistance
1000 hr @
212°F (100°C)
Stress
Relaxation
Resistance
1000 hr @
392°F (200°C)
A
1/4H
1/2H
H
-
-
-
-
0
0
0.5
1
0
0
1
3
-
-
-
-
-
-
-
-
AT
1/4HT
1/2HT
HT
22
22
22
22
-
-
-
-
-
-
-
-
96
96
97
98
70
70
73
74
AM
1/4HM
1/2HM
HM
SHM
XHM
XHMS
16
16
16
17
18
19
20
0
0
0
1
2
3
4
0
0
0
1
2
4
6
97
97
97
98
98
99
99
76
76
76
77
77
78
78
NGK 14 (UNS C17510); 0.50 wt% Be, 1.80 wt% Ni, Balance Cu
Temper
Standard
Temper
ASTM
Formability
(max R/t for
90° bend)
Good Way
Typical
Formability
(max R/t for
90° bend)
Bad Way
Typical
Stress
Relaxation
Resistance
1000 hr @
212°F (100°C)
Stress
Relaxation
Resistance
1000 hr @
392°F (200°C)
A
H
-
-
0
0.5
0
0.5
-
-
-
-
AT
HT
45
48
1
2
1
2
94
96
72
75
NGK 17510TMP (UNS C17510); 0.50 wt% Be, 1.80 wt% Ni, Balance Cu
Temper
Standard
Temper
ASTM
Formability
(max R/t for
90° bend)
Good Way
Typical
Formability
(max R/t for
90° bend)
Bad Way
Typical
Stress
Relaxation
Resistance
1000 hr @
212°F (100°C)
Stress
Relaxation
Resistance
1000 hr @
392°F (200°C)
1/2HM
HM
50
50
1
2
1
2
94
96
72
75