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BEL Series 45 Carbon Track Potentiometer

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Resistance Value Linear

Series 45 Carbon Track Potentiometer

Available in a wide range of resistance values

Solder or PC terminations

1/4" or 6mm Diameter plastic shaft

Variety of standard lengths to choose from

A hard-working 1" diameter old school pot


The Series 45 Carbon Composition Potentiometer has a proven track record in all aspects of the electronics industry and can claim to be among the most versatile general-purpose potentiometers available.


Our Series 45 potentiometers are highly customizable. Standard pots are fitted with a plastic shaft, but all are available with metal shafts. In May 2017 we re-introduced the knurled and slotted brass shaft model for guitars, a decision driven by customers looking for an alternative to the more commonly used CTS models (here). In addition, to this, the Series 45 is customizable even further by our wide range of resistance values, in linear, logarithmic and reverse logarithmic laws, our shaft options, termination options, and bushing options. We can also offer different torque settings on our metal shaft potentiometers from our standard 0.7Ncm to a much higher torque of 3.6Ncm, with varying degrees in between to suit your requirements. This is particularly useful for audio applications where the feel of the pot is critical.


NOTE: When ordering please ensure you choose NONE in the resistance law you do not require. Thank you!


Tech specs



Mechanical Rotation

300º +/- 5º without switch

320º +/- 5º with switch


Operating Torque

0.7 - 3.6 Ncm


End Stop Torque

113Ncm minimum


Resistor Adjustment

Integral moulded spindle

Plug-in metal spindle

Integral metal spindles (outer and inner)

Integral metal spindle (outer) integral moulded spindle (inner)

*Lengths, diameters and end configurations are customisable.


Terminal options

Solder, Printed circuit, wire wrap


Mounting Details

Bush     9.5mm diameter diecast bush, 32 TPI Whitworth form

            6.35mm diameter diecast bush, 32 TPI Whitworth form

            Locating key, 7.9mm long located left (terminals down, viewed from spindle end).

            Locating key fits 3.2mm diameter hole on an 11.1mm radius.

            Each potentiometer comes supplies with one fixing nut and one internal tooth lock washer

                M10 diecast bush, M10x0.75x8mm long with standard or DIN locating key.

            Bushes of other lengths and materials are available upon request




Effective Rotation

270º +/- 5º


Resistance Range

500 Ω to 10M Ω Linear

1K Ω to 10M Ω Logarithmic (positive and negative laws)

Non standard resistance values are available on request


Resistance Tolerance

Standard  +/- 20% for values to 1M Ω

               +/- 30% for values above 1M Ω

Special    +/- 10%



Linear, Log, Reverse Log.

Other specials available on request.


Insulation Resistance

>5000M Ω


Voltage Rating

500V d c maximum


Terminal Resistance

Linear: 0.5% RN

Log: low slope end 0.5%

       high slope end 2.0%

Standard minimum resistance value 5 Ω


Voltage Proof

1.5 kV peak minimum

Temperature Range

-25ºC to 70ºC


Temperature Coefficient

Typically +/- 500 ppm


Power Rating at 40ºC Ambient Temperature

0.5W Linear

0.25W Logarithmic