ATE Test Probes > PA4 & ST-PA4 Series >

2.54mm / 0.10" test centres

The PA4 Series is the universal size for use at 2.54mm test centres in the majority of ATE test fixtures. It has a very wide range of tip styles for almost all test targets. Additionally, a wide choice of spring forces is available. The ST-PA4 series adds hardened steel tips which ensure an exceptional resistance to wear in high volume PCB production runs. The LF-PA4 series has hardened tips, extra resilient plated surfaces and an enhanced pre-loaded spring pressure to enable good penetration of the tough residual contamination often found on the surface of many lead-free solders.

Test Probe Specification

Full travel
6.35mm (.250")
Working travel
4.24mm (.167")
Spring force
at wkg travel
'L' Extra light spring
57g (2.0oz)
'S' Light spring
114g (4.0oz)
'X' Heavy spring
170g (6.0oz)
'E' Extra heavy
227g (8.0oz)
'U' Ultra heavy spring
283g (10.0oz)
'W' Ultra heavy spring
350g (12.0oz)
Current rating DC (max)
cont shown with tip style
Minimum test centres
2.54mm (.100")


Receptacle Specification

Mounting hole size: 1.7/1.75mm.
1.75mm drill is most commonly used:
Drill part no. DA3, RIT tool part no. TA3, TA4A

How to Use


See receptacles at bottom of page

For pricing, availability or to place an order
click on a part no. below

Tip Style

CONCAVE HEAD STEEL - 8 amps max.

CONCAVE HEAD STEEL - 8 amps max.
ST-PA4AS Light spring  
ST-PA4AU Ultra Heavy spring  
ST-PA4AX Heavy spring    

Tip Style

FLAT HEAD 1.5mm - 3 amps max.

FLAT HEAD 1.5mm - 3 amps max.
PA4FS Light spring  
PA4FX Heavy spring  

Tip Style

SERRATED HEAD 2.0mm - 3 amps max.

SERRATED HEAD 2.0mm - 3 amps max.
PA4HS-080 Light spring  
PA4HX-080 Heavy spring  

Tip Style

SERRATED HEAD 2.5mm - 3 amps max.

SERRATED HEAD 2.5mm - 3 amps max.
PA4HS-100 Light spring  
PA4HX-100 Heavy spring  

Tip Style

SERRATED HEAD 3mm - 3 amps max.

SERRATED HEAD 3mm - 3 amps max.
PA4HS-120 Light spring  
PA4HX-120 Heavy spring  

Tip Style

SERRATED HEAD 4.0mm - 3 amps max.

SERRATED HEAD 4.0mm - 3 amps max.
PA4HS-160 Light spring  
PA4HX-160 Heavy spring  

Tip Style

REDUCED RADIUS - 8 amps max. (for connector applications)

REDUCED RADIUS - 8 amps max. (for connector applications)
PA4JS-064 Light spring  
PA4JL-064 Extra light spring  
PA4JX-064 Heavy spring  
PA4JU-064 Ultra heavy spring  

Tip Style

PLAIN RADIUS- 3 amps max.

PLAIN RADIUS- 3 amps max.
PA4JS Light spring  
PA4JX Heavy spring  
PA4JU Ultra Heavy spring    

Tip Style

STAR HEAD - 3 amps max.

STAR HEAD - 3 amps max.
PA4MS Light spring  
PA4MX Heavy spring  
PA4MU Ultra heavy spring    

Tip Style

0.5mm SMALL CROWN - 8 amps max.

0.5mm SMALL CROWN - 8 amps max.
PA4QS-018 Light spring  
PA4QX-018 Heavy spring  
PA4QU-018 Ultra heavy spring    

Tip Style

SMALL CROWN STEEL - LEAD FREE

SMALL CROWN STEEL - LEAD FREE
LF-PA4QX-018 Heavy spring  
LF-PA4QU-018 Ultra heavy spring  

Tip Style

1.3mm CROWN - 8 amps max - LEAD FREE

1.3mm CROWN - 8 amps max - LEAD FREE
LF-PA4QX-050 Heavy spring  
LF-PA4QE-050 Ex heavy spring  
LF-PA4QU-050 Ult Heavy spring    

Tip Style

1.5mm CROWN - 3 amps max.

1.5mm CROWN - 3 amps max.
PA4QS-060 Light spring  
PA4QX-060 Heavy spring  

Tip Style

1.5mm PYRAMID HEAD

1.5mm PYRAMID HEAD
PA4TS Light spring  
PA4TX Heavy spring  

Tip Style

2.0mm PYRAMID HEAD

2.0mm PYRAMID HEAD
PA4TS-2.0 Light spring  
PA4TX-2.0 Heavy spring  

Tip Style

2.5mm PYRAMID HEAD Heavy spring

2.5mm PYRAMID HEAD Heavy spring

PA4TX-2.5

Tip Style

3.5mm PYRAMID HEAD Heavy spring

3.5mm PYRAMID HEAD Heavy spring

PA4TX-3.5

Lead-Free Solder Tip Style

SUPER-SHARP BLADE - 8 amps max. - LEAD FREE

SUPER-SHARP BLADE -  8 amps max. - LEAD FREE
LF-PA4KX Heavy spring  
LF-PA4KE Ex heavy spring  
LF-PA4KU Ult heavy spring   

Lead-Free Solder Tip Style

STEEL SHARP 90° BLADE - 8 amps max. - LEAD FREE

STEEL SHARP 90� BLADE -  8 amps max. - LEAD FREE
LF-PA4IX Heavy spring  
LF-PA4IE Ex heavy spring  
LF-PA4IU Ult heavy spring    

Lead-Free Solder Tip Style

ROBUST 90° BLADE - 8 amps max. - LEAD FREE

ROBUST 90� BLADE - 8 amps max. - LEAD FREE
LF-PA418X H spring  
LF-PA418E Ex heavy spring  
LF-PA418U Ult heavy spring   

Tip Style

STEEL CROSS BLADE - 8 amps max.

STEEL CROSS BLADE -  8 amps max.
ST-PA4LS Light spring  
ST-PA4LX Heavy spring  
ST-PA4LU Ultra heavy spring    

Tip Style

SHARP DAGGER - 8 amps max. - LEAD FREE

SHARP DAGGER -   8 amps max. - LEAD FREE
LF-PA4TX-042 Heavy spring  
LF-PA4TE-042 Ex heavy spring  
LF-PA4TU-042 Ult heavy spring    

Receptacle

CRIMP

CRIMP

RA4C

Receptacle

SOLDER CUP

SOLDER CUP

RA4S

Receptacle

0.64mm ROUND PIN

0.64mm ROUND PIN

RA4R

Receptacle

1.0mm ROUND PIN

1.0mm ROUND PIN

RA4R-040

Receptacle

WIRE-WRAP

WIRE-WRAP

RA4W

Receptacle

Receptacle - Wire wrap

Receptacle - Wire wrap

RA4W3

Receptacle

WIRE WRAP

WIRE WRAP

RA4W12

Receptacle

RECEPTACLE WIREWRAP

RECEPTACLE WIREWRAP

RA4WL

Receptacle

WIRE WRAP

WIRE WRAP

RA4WLL

Receptacle

WIREWRAP

WIREWRAP

RA4WLLL