Shopping cart is empty


To prevent automated spam submissions leave this field empty.

+44 (0) 191 387 1923


Map replacement


Peak Test Services Ltd

152a Front Street
Co. Durham
United Kingdom
+44 (0) 191 387 1923
+44 (0) 191 387 1994

Contact Us

This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.


High Current Block up to 600A for Contacting Pri
The current developments in electromobility and

About Peak Test

Founded in 1986, Peak Test is the UK leader in the distribution of test probes and receptacles, it carries the most comprehensive range of probes, many of which are available ex-stock for next day delivery.

Peak Test are the UK distributor for Virginia Panel Corporation (VPC) Mass Interconnect, Optomistic LED Test and Voltera Prototype PCB Printer.

Peak Test Services is an ISO accredited Company.

The leading UK distributor of Spring Contact Test Probes and Test Accessories

COVID-19 STATEMENT: We are open for business and our objective is for everyone to remain safe with minimum disruption.

Our aim is for all promised delivery dates to be met however, in some circumstances it may be necessary to adjust some of these dates.

We remain committed in communicating fully with you to keep you updated at all times.

We can provide information and literature on solutions that may benefit any upcoming projects therefore please do not hesitate to contact us.

Recommended Drill Sizes


PCB Drill

A frequently asked question is, what drill size should be used for receptacles and probes?

We offer a wide range of complex receptacles therefore please view our chart below for recommended drill sizes. Should the receptacle you are using not be shown below then please contact us.

All measurements are guidelines and a trial is vital as different factors contribute towards the correct hole size i.e. material, drill speed and quantity.

Mounting the receptacle into the mounting plate requires special precision. Various parameters such as rotating speed, feed, helical groove length, material and plate thickness are influencing the drilling results.

It is very important to carry out trials to ensure the receptacles have a suitable seat in the mounting plate.  

Receptacle Series Press Ring As Stop Press Ring Inserted
  Drill Size (mm)
R25 series 1.65 1.75
R16 series 1.67 1.75
R75 series 1.30 1.36
R30 series 2.40 2.55
R60 series 3.00  
R40 series 3.00  
R21 series 2.00  
R730 series 0.85 0.95
R101 series 1.30 1.45
R21/G series 2.00  
R15/G series 1.68-1.70  
R60/G series 3.00  
R42 series 3.50  
R42/G series 3.50  
R275 series 1.30 1.37
R202 series 2.00  
R201 series 3.00  
R202/G series 2.15  
R201/G series 3.00  
R221/G series 3.28-3.31  
R204/G series 3.50  



To view our full range of test probes available, please click here. Alternatively, do not hesitate to contact us via email or phone

To download this guide, please click here