This is a quick guide to help you identify the size of the Storz Connection
of an existing adapter you may have.

To identify your Storz Connection size you need to measure the distance between the lugs, the following image shows this.

Storz Measurement

You can match up your Storz Connection using the following table.

 

Storz Size Distance between Lugs
25 31mm
38 51mm
50 66mm
65 81mm
75 89mm
90 105mm
100 115mm
125 148mm
150 160mm

 

 

Thread Sizes

 

Here is a chart to help identify thread sizes.

 

The Size Column is the BSP size and the Male & Female
Columns show the size in mm that you will see
when measuring across the thread.

 Adapter with male thread DiagramAdapter with female thread Diagram

Size (BSP) Male Thread (AG in mm) Female Thread (IG in mm)
3⁄4 inch (19mm) 26.441 24.117
1 inch (25mm) 33.249 30.291
1 1⁄2 inch (38mm) 47.803 44.845
2 inch (50mm) 59.614 56.656
2 1⁄2 inch (65mm) 75.184 72.226
3 inch (75mm) 87.884 84.926
4 inch (100mm) 113.03 110.072
5 inch (125mm) 138.43 135.472
6 inch (150mm) 163.83 160.872