Ready stock of panel knobs and dials that keep projects moving
When a prototype deadline or lab class can't wait, waiting for parts is not an option. Communica keeps a broad range of knobs, rotary dials, potentiometer knobs and panel controls on hand so South African makers, students, technicians and procurement teams can collect the parts they need the same day. Our focus is practical: matching shaft type, diameter, detent feel and mounting style to your application so your build fits first time.
Why buy in-stock knobs & dials from Communica
- Local availability - check Samrand stock for immediate pickup and branch collection in Pretoria and Cape Town via our Branches & Trading Hours.
- Technical fit help - guidance on shaft fits (D-shaft, knurled, splined), diameter, and set-screw vs push-on mounting to avoid rework.
- Procurement-friendly - VAT invoices, account quotes and bulk ordering available for tertiary labs and OEM runs.
Common specifications you should verify
For fast fit, confirm these key specs before ordering: shaft type and diameter (mm), knob inner bore finish (smooth/knurled), maximum shaft insertion depth, material, and whether the knob includes markings or detents. Below is a quick spec comparison to help shortlist parts.
| Type | Shaft fit | Typical use | Notes |
|---|---|---|---|
| Push-on plastic knob | Smooth round 6mm | Student kits, low-torque controls | Cheap, quick fit, may slip under torque |
| Set-screw aluminium | 6mm D-shaft / knurled | Prototypes, small production | Secure, better tactile feel |
| Splined metal knob | 6mm/1/4" splined | Encoders, precision potentiometers | Precise fit, less play |
Practical compatibility checks
A quick bench check saves returns: slide the knob onto the shaft, confirm the rotation range (0-270° typical for pots), and test for side play. If your build uses an encoder, verify detent spacing and shaft diameter. For classroom kits we recommend push-on plastic knobs for safety and cost; for lab rigs choose metal set-screw knobs for repeatability.
Accessories and bundles often ordered together
- Spare set screws and tiny hex keys (M1.4-M2 sizes).
- Calibration markers and pointer caps for rotary encoders.
- Bulk student kit packs - knobs, potentiometers, and panel labels for lab classes.
Explore related ranges and confirm stock levels on our Shop by Category page or browse brands for preferred fit and feel on our Shop by Brand listing.
