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075-40 Series | .075 [1.91] Centers | .400 [10.16] Full Stroke

Designed for dual level, loaded board testing.


75mil 400 Stroke Probes for dual level, loaded board testing

Spring Force

spring force chart

Probe Selection

QA Technology offers many combinations of probes. You can build your probe by selecting the tube style, tip style and spring force for your specific application.

If you have questions at any time during the process, contact us at (603) 926-0348.

P/N 075-PR
NOTE: Not all combinations are available. Please verify your part number to be sure it is valid.
If you need assistance, please call 603-926-0348.

Begin building your part number.

Select your tube material.
      Current Rating1
Letter Material Average Resistance MW @ 120°C SS @ 204°C
 P Nickel silver/ID precious metal clad < 20 milliohms 7.3 Amps 10.0 Amps
 G Nickel silver/OD gold plated < 25 milliohms 7.2 Amps 9.9 Amps
 N Nickel silver/no finish < 210 milliohms 6.1 Amps 9.0 Amps
Select your tip style. Standard material is heat-treated BeCu/plated gold over nickel.
Choose Steel for steel plungers, if available.
Use the drop-down menu at right to filter your choices by target type.
Select your spring force.
Letter Spring Force Preload @ .317 [8.05]
Material Cycle Life @
.317 [8.05] Stroke
 S Standard 1.2 [34g/0.33N] 4.3 [122g/1.20N] SS 500,000
 H3 High 1.7 [48g/0.47N] 7.0 [198g/1.95N] SS 300,000
 U3 Ultra 1.3 [37g/0.36N] 9.3 [264g/2.59N] MW 10,000
Select your option (if required).
Letter Description
 B Curved tube (pylon replacement)
 D Decreased stroke at .250 [6.35]. Must select from 075-25 series spring forces with this option.
 N No probe lubrication. Removing probe lubrication greatly reduced cycle life and should only be used in applications requiring operating temperatures below -55°C.
Steel Heat treated steel/plated gold over nickel (see tip styles for availability)

1Current Rating is affected by spring material and lubrication choices. Standard lubrication has a 120°C maximum operating temperature limit. Use SS springs with no lubrication (-N) for testing beyond standard lubrication temperatures limits up to 204°C, Before using probes near these current limits, please refer to Current Carrying Capacity and Operating Temperature Application Notes.

2Maximum plunger OD should be used to calculate minimum guide plate clearance holes.

3 0.350 [8.89] max stroke for H & U spring

All specifications subject to change without notice. All dimensions are in [mm]. All spring forces are oz [gm/newtons]. US Patent No. 4,885,533