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X Probe Logo X39-25 Series | 0.039 [1.00] Centers | 0.250 [6.35] Full Stroke

Designed for loaded board testing.


39mil 250 Stroke Socketless Probe for loaded board testing 39mil 250 Stroke Socketless Probe for loaded board testing

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.

Spring Force

spring force chart
P/N X39-PR P25
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.

Letter Material Average Resistance Current Rating AMPS1
120°C (204°C)3
 P Nickel silver/ID precious metal clad < 25 milliohms 3.4 (4.7)3
TIP STYLE SELECTION. 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.
Letter Spring Force Preload @ 0.167 [4.24]
Material Cycle Life @
0.167 [4.24] Stroke
 L Low 1.2 [34g/0.33N] 3.0 [85g/0.83N] MW 1,000,000
 S Standard 1.1 [31g/0.31N] 4.3 [122g/1.20N] MW 1,000,000
 H High 2.4 [68g/0.67N] 5.6 [159g/1.56N] MW 1,000,000
 Y Elevated 3.2 [91g/0.89N] 8.0 [227g/2.22N] SS 25,000
 E High Preload (Available only
with headless -S tip styles)
4.2 [119g/1.17N] 8.0 [227g/2.22N] SS 10,000
Letter Description
 L Long plunger. Must select from X39-40 tip styles
 N No probe lubrication. Removing probe lubrication greatly reduces cycle life and should only be used in applications outside of the working temperature range. See Testing in Extreme Working Temperature application note for more details. 3
Steel Heat treated steel/plated gold over nickel. (see tip styles for availability).
You may add your Part Number to your Order.

1 Current Rating is affected by spring material and lubrication choice. Please refer to Current Carrying Capacity and Testing in Extreme Temperature application notes for more details.

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

3 Working Temperature Range: -45°C to 120°C with lubrication. SS springs can be used up to 204°C without lubrication.

All specifications subject to change without notice. All dimensions are in [mm]. All spring forces are oz [gm/newtons]. US Patent No. 6,570,399 & 4,885,533