Most of our spring plungers can be installed using a screwdriver, hex key wrench or spring/ball plunger wrench. Be aware that the recommended tool for installation is a spring/ball plunger wrench because a screwdriver can over compress the spring and cause alteration or damage to the end force of the spring plunger.
Nearly all hand retractable plungers can be installed by using the knob to engage the threads or by using a wrench on the hex flats on the plunger body.
Warning: spring plunger bodies are hollow, so the maximum installation torque able to be withstood is significantly less than for bolts or screws. The following table should be used as a guideline for installation:
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Unified Thread Size
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Metric Thread Size
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Max. Installation Torque (inch Pounds)
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No. 4
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M 2.5 x 0.45
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.60
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No. 5
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M 3 x 0.5
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1.25
|
|
No. 6
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M 3.5 x 0.6-6g
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1.65
|
|
No. 8
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M 4 x 0.7-6g
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2.15
|
|
No. 10
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M 5 x 0.8-6g
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3.15
|
|
1/4
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M 6 x 1-6g
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6.0
|
|
5/16
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M 8 x 1.25
|
11.0
|
|
3/8
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M 10 x 1.5
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16.0
|
|
7/16
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M 11 x 1.5
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22.0
|
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1/2
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M 12 x 1.75
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28.0
|
|
9/10
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M 14 x 2.0
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36.0
|
|
5/8
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M 16 x 2.0
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55.0
|
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3/4
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M 20 x 2.5
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70.0
|
|
7/8
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M 22 x 2.5
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95.0
|
|
1
|
M 24 x 3.0
|
130.0
|
|
1-1/8
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M 30 x 3.5
|
160.0
|
|
1-1/4
|
M 33 x 3.5
|
190.0
|
All threaded spring plungers can be ordered with or without a nylon thread-locking element. To order any spring plunger part number without a locking element, just add an “X” the end of the part number. For example, a 52805 ball plunger comes with a nylon-locking element and a 52805X ball plunger comes without a nylon locking element.
During installation, the nylon-locking element forces the threads on the opposite side of the spring plunger to compress against the mating threads of a tapped hole, providing the thread locking property. This nylon-locking element can cause installation problems when installing into softer metals or aluminum. To prevent this problem, use a larger tap drill when tapping, order a spring plunger without a locking element, or request a quote for a special spring plunger that will better fit your application.
When installing spring plungers with a nylon thread locking element pellet (thread sizes ¼ “ and larger or M8 and larger), we recommend that the tapped installation hole be countersunk 90° by 1/32 larger than major thread diameter to prevent damage to the locking element.
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