Knobs

Knobs are essential for the control and adjustment of devices. Whether you require hardwearing industrial handles for machinery or knobs for a more delicate electronic device, you're sure to find the one that fits your needs in our range.

RS only stocks products from leading brand names, including EHC and Ohmite knobs. If you know which knob you need, you can enter the part number or keyword into the search bar. Alternatively, filter the results to meet your specifications.

Shop online today and discover why RS is North America's leading distributor of electronic parts and components.

What is a control knob used for?

A control knob is effectively a rotary device that allows the user to make manual adjustments to mechanical or electrical devices for an altered outcome.

Whenever a device requires a human operator, it's important the control meets the needs of the user, as well as the device. Our range of industrial knobs has been handpicked for their precise adjustments and ability to be used across a plethora of appliances.

Control knobs can be found on household items like refrigerators and stoves, as well as in industrial settings. Understanding the different types of knobs and the materials they're made from can help you choose the right hardware for the job.

What are the common types of knobs?

At RS, we stock a large selection of different types of knobs, suitable for all applications and projects.

Fluted knobs

The grooves around the edge give the user a firm grip for more precise movements.

Lobe knobs

Designed for medium to high-torque requirements, the exacting control makes lobe knobs ideal for machinery.

T-handle knobs

Perfect for high-torque applications, T-handle knobs can also be called wingnut knobs. The ergonomic shape provides an easy grip.

Control knobs

Usually featuring easy-to-read markings, control knobs provide the user with precise positioning. They sometimes feature a tapered or pointed side.

Ball knobs

Shaped like a ball, with a round head, ball knobs are typically used for applications that require a side-to-side or up-and-down movement. Black phenolic ball knobs are the most popular style of ball knobs thanks to the durability of the phenolic material.

What are industrial knobs made from?

The environment in which your device is situated and the heat that emanates from the device itself will determine which knob to choose. Industrial knobs and hardware are often made from heat-resistant and highly durable materials.

It's not just the external knob mold that can impact its efficacy, but what the threaded insert material is made from. Strong material will provide the knob with added structure to enable maximum torque. The popular Ohmite knobs are made from plastic nylon, whilst the range of EHC knobs are manufactured using polycarbonate.

Nylon

Pros:

• The most popular material for industrial knobs.
• Offers high-impact resistance.
• Insulates well against electricity.
• Resists the majority of oils, fuels, and greases.

Cons:

• Can absorb moisture, but over time this can affect stability and precision control.
• Can corrode when exposed to strong acids, alcohols, and alkalis.

Phenolic

Pros:

• Phenolic knobs and handles are extremely resistant to heat, water, oils, and grease.
• Cost effective.

Cons:

• Phenolic knobs are thermosets, which makes them extremely rigid.
• Can shatter in extremely high-vibration applications.

Stainless steel

Pros:

• Stainless steel resists corrosion.
• Retains its strength, even in high temperatures.
• Because it's non-porous, it's extremely hygienic.
• Used for both knob molds and thread inserts.

Cons:

• Conducts electricity.
• Costs more than plastics but lasts longer.

Get everything you need with RS

Choose RS for your industrial knobs and hardware. From classic phenolic knobs to lightweight plastic knobs from Ohmite, Electroswitch, Electronic Hardware Corporation (EHC), and our own brand RS PRO, we only stock high-quality products.

So, when you buy from us, you can buy in confidence. If you need more help choosing the right knob for your application, you can check out our expert advice hub for practical tips and ideas, as well as the latest industry news.

You can also get in touch with our team for more tailored advice and help.