MAXIMUM SOLUTIONS
Mill-Max Now Off ers Nine Sizes of Beryllium Nickel
Spring Contacts for High Temperature Applications.
Mill-Max off ers nine contacts (#19, #24, #25,
#26, #27, #33, #38, #56,#58) made from Beryl-
lium Nickel Alloy 360 (UNS N03360.) Contacts
made from Beryllium Nickel are recommended
for receptacle applications where the operat-
ing temperature exceeds 150C. Some common
applications for these contacts are found in: the
oil industry for down-hole wells and exploration;
Test & Burn-in sockets for stress testing elec-
tronic devices (i.e. chips;) high temperature com-
mercial lighting fi xtures (e.g. Halogen lamps) and
autoclave sterilization for the medical industry.
BeNi is suitable for continuous use up to 250C,
and periodic use up to 350C, without signifi cant
loss of its spring properties (see graph.) For use
below 150C, Mill-Max has an extensive range of
29 standard Beryllium Copper (Alloy 172) spring contacts.
These nine contacts are available assembled in a wide range of standard precision-machined receptacles
(discrete sockets for printed circuit boards) and various types of socket assemblies (DIP, SIP etc.) These con-
tacts are the internal spring member of the highly reliable, two piece Mill-Max receptacle and are not sold as
individual items.
Properties of BeNi Alloy 360
Chemical composition: Ni 97.6%, Be 1.9%, Ti 0.5% 100
Modulus of Elasticity: 27-30x106 psi 90
Tensile Strength: 245x10 psi min. 80
#38 (BERYLLIUM NICKEL)
Yield Strength (0.2% off set): 200x10 psi min.
70
CONTACT
Hardness: 49 Rockwell C
60
50
Contact Material and Stress 40
Relaxation at High Temperature
30
Mill-Max contacts are made from either beryllium copper
20
#30 (BERYLLIUM COPPER)
or beryllium nickel that has been heat treated to achieve
10
CONTACT
ultimate spring properties. The graph illustrates how beryl-
0
lium copper loses its spring properties over time at a high
100 1000
10
temperature (225C). Thus, for burn-in applications and
EXPOSURE TIME (HOURS) @ 225C
continuous operation above 150C, beryllium nickel should
be substituted for beryllium copper.
(11/12 -- PR548)
Mill-Max Mfg. Corp. 190 Pine Hollow Road, Oyster Bay, NY 11771
516-922-6000 Fax: 516-922-9253 www.mill-max.com
% OF INITIAL NORMAL FORCED
E
N
I
H
N
CONTACT DATA
PINS
1000.0
#25 CONTACT
#25 CONTACT
FOR .015-.020 DIAMETER PINS (d=.003)
3-FINGER, GROUP A (see page 214)
100.0
INITIAL INSERTION FORCE
INSERTION FORCE 2nd CYCLE
EXTRACTION FORCE
G
OPERATING RANGE
10.0
MATING PIN DIAMETER (inches)
The insertion/extraction/normal force characteristics above were derived using 30 microinch gold plated contact
and polished steel gauge pins having a bullet-shaped tip.
The curves represent typical average values; they are best used to compare the differences between similar size
CONTACT MATERIAL:
contacts and to guide you in selecting one that is suitable for your application. Your results may vary, so for your
BERYLLIUM NICKEL Alloy 360, Heat Treated
specification, we encourage you to obtain complimentary samples for your evaluation.
1000
#38 CONTACT
#38 CONTACT
FOR .015-.025 DIAMETER PINS (d=.004)
4-FINGER, GROUP C (see page 214)
100
INITIAL INSERTION FORCE
INSERTION FORCE 2nd CYCLE
EXTRACTION FORCE
D
OPERATING RANGE
10
MATING PIN DIAMETER (inches)
The insertion/extraction/normal force characteristics above were derived using 30 microinch gold plated contact
and polished steel gauge pins having a bullet-shaped tip.
The curves represent typical average values; they are best used to compare the differences between similar size
CONTACT MATERIAL:
contacts and to guide you in selecting one that is suitable for your application. Your results may vary, so for your
BERYLLIUM NICKEL Alloy 360, Heat Treated
specification, we encourage you to obtain complimentary samples for your evaluation.
1000.0
#19 CONTACT
#19 CONTACT
FOR .020-.032 DIAMETER PINS (d=.003)
6-FINGER, GROUP K (see page 214)
100.0
INITIAL INSERTION FORCE
INSERTION FORCE 2nd CYCLE
EXTRACTION FORCE
G
OPERATING RANGE
10.0
MATING PIN DIAMETER (inches)
The insertion/extraction/normal force characteristics above were derived using 30 microinch gold plated contact
and polished steel gauge pins having a bullet-shaped tip.
The curves represent typical average values; they are best used to compare the differences between similar size
CONTACT MATERIAL:
contacts and to guide you in selecting one that is suitable for your application. Your results may vary, so for your
BERYLLIUM NICKEL Alloy 360, Heat Treated
specification, we encourage you to obtain complimentary samples for your evaluation.
www.mill-max.com 516-922-6000
PR#548
O
C
I
A
S
I
M
C
E
FORCE (grams)
FORCE (grams)
FORCE (grams)
0.018 0.011
0.011
0.019
0.012
0.012
0.020
0.013
0.021
0.014
0.013
0.022
0.015
0.023
0.014
0.016
0.024
0.017
0.015
0.025
0.018
0.026
0.019
0.016
0.027
0.020
0.028
0.017
0.021
0.029
0.022
0.018
0.030
0.023
0.031
0.024
0.019
0.032
0.025
0.033
0.020
0.026
R
P