RS PRO Potentiometer Knob, Grub Screw Type, 28mm Knob Diameter, Black, Red, 6.35mm Shaft

Technical Reference
Legislation and Compliance
RoHS Certificate of Compliance
COO (Country of Origin): TW
Product Details

RS PRO Grub-Screw Knobs with Fitted Caps

This Grub-Screw Knob 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

• Grub screw knob moulds in variety of shaft sizes and materials
• Available in diameters from 11.6mm to 28mm, with red, black or grey caps


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 6.35mm
Knob Diameter 28mm
Knob Height 17mm
Body Colour Black, Red
Indicator Colour White
Knob Type Grub Screw
Material Plastic
1050 In stock for delivery within 1 working days
Price Each (In a Pack of 5)
kr 11,844
(exc. VAT)
kr 14,805
(inc. VAT)
Per unit
Per Pack*
5 - 45
kr 11,844
kr 59,22
50 - 245
kr 10,694
kr 53,47
250 - 495
kr 10,462
kr 52,31
500 - 995
kr 9,94
kr 49,70
1000 +
kr 7,89
kr 39,45
*price indicative
Related Products
From Sifam, this selection of matt finish collet ...
From Sifam, this selection of matt finish collet knobs are functional and simplistic. Compatible with various push-fit accessories, such as dial skirts and nut covers, this range of collet knobs are as versatile as they are practical. Sifam collet knobs ...
The CAP series from Selco is a dynamic ...
The CAP series from Selco is a dynamic range of bulb and capillary thermostats which feature a fluid filled bulb. The ceramic thermostats have a compact design and have been created to work in a variety of different applications including ...
From Atoms, the BT-81 Series control knobs are ...
From Atoms, the BT-81 Series control knobs are accurate, reliable and stylish. Featuring a highly effective rotation brake, these precision control knobs are for use with single-turn potentiometers. BT-81 Series control knobs are available in five different colours. • Total ...
Choice of satin anodised finish with white markings ...
Choice of satin anodised finish with white markings on a black background or black chrome with white markings. High quality precision mechanism with ball bearing movement. Positive 'click' action transfer point. Locking lever for fixed position, special mounting spacer.