Potentiometer Knob, Grub Screw Type, 25mm Knob Diameter, Silver, 6.4mm Shaft

Potentiometer Knob, Grub Screw Type, 25mm Knob Diameter, Silver, 6.4mm Shaft


There are many different uses of a potentiometer. The three main applications of a potentiometer are:

• Comparing the emf of a battery cell with a standard cell
• Measuring the internal resistance of a battery cell
• Measuring the voltage across a branch of a circuit

How does potentiometer work?

Most potentiometer knobs are simply fixed on manually with a simple push by fitting it to the shaft. They either have a knob, screw, grub, or slider as a fixture that is used as a control element to vary the resistance between the middle terminal and either one of the outer terminals for the potentiometer.


RS PRO is our own brand range and brings you a wide range of high-quality, great value products offering you more choice. Trusted by engineers all over the world, every part of every RS PRO product has been rigorously tested against demanding industry standards; they’re only given the RS PRO seal of approval if we’re confident of their exceptional quality, which means you can be confident too.

Attribute Value
Shaft Size 6.4mm
Knob Diameter 25mm
Knob Height 15mm
Body Colour Silver
Knob Type Grub Screw
Material Aluminium
6 In stock – FREE next working day delivery available
Price Each


(exc. VAT)


(inc. VAT)
Per unit
1 – 9
10 – 99
100 – 249
250 +


This Potentiometer from our own RS PRO brand is designed to be used for professional equipment to control electrical devices such as volume controls on audio equipment.

Features and Benefits

• Resists shock, vibration, or accidental movement
• No special mounting hardware or tools required
• Made of highest quality materials
• Occupies minimum panel space