72A Tungsten Wire (5 mil) Probe

Please note that the pricing is based on each probe and not box quantity
10/box 20/box 5/box 25/box
Our quantity discounts:
Quantity 50+ 250+ 500+
Price $7.84 $7.43 $7.01

Minimum quantity for "72A Tungsten Wire (5 mil) Probe" is 20.

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The 72A Series Probes are constructed from a 5 mil (.005") tungsten wire butt welded to a 20 mil (0.02") Nickel-S shank. The shank is easily bended into any shape. The overall length of the probe is about 1.20", and may be easily cut to reduce the overall length if needed.

The 72A Series with a radius or less that 0.5 micron must be ordered with a "D3" taper length and profile.

Compatible with most industry standard probe holders.
Excellent probe for In-Circuit Probing

Can be bent or cut to shape.

All prices are EACH PROBE, NOT PER BOX
Sold in boxes of  10, 20, or 25.

Made to order.


What size probe should I use?

The typical recommendation is to use a probe diameter that is half to two thirds the size of the contact. Remember, APT's probes are sold by the radius, so you must double the number to determine the diameter. It is normally found that a radius larger than 20 microns does not yield lower contact resistance. An example is: The contact pad is 10 microns, using the recommendation, you would then use a probe with a radius of 2.5 - 3.5 microns. (5- 7 micron diameter)

Why are some probes etch and others ground?

There are two common ways to manufacture the probe's taper and radius: 1.Electrochemically etch 2.Mechanically grind Why is one method chosen over another? 1.The base material is the driving reason: a. Tungsten, Tungsten rhenium are typically electrochemically etched b. Paliney® 7, beryllium copper, tungsten carbide, steel are generally mechanically ground materials This is the short answer, for more details on the subject please refer to the link in the Technical Resources Area under Probe Question's.

Dimensions of the 72A Series 5 mil (0.005") tungsten wire butt welded to a nickel plated copper alloy 20 mil (0.0197") shank. 
The tungsten wire "contact probe" is electrochemically etched to form the taper and radius:


72A Series disposable probe



Please refer to this section for American Probe & Technologies cross reference to other manufactures model numbers.


Cascade Part Number
Equivalent APT Model Number
56734 72A-C5/075