The MF-A04 is a round potentiometer knob cap designed for smooth, precise manual control of rotary potentiometers. With a classic cylindrical profile and a wide-skirted base, it provides a comfortable and secure grip. The knurled side surface prevents slipping during adjustment, while the recessed indicator line on the top face allows the user to read the current rotational position at a glance. Secured to the shaft via a side-mounted set screw, this knob is suitable for panel-mount applications in audio equipment, laboratory instruments, power supplies, industrial controls, and DIY electronics projects.

It is compatible with the WH118 and WX050 series of rotary potentiometers, which are among the most commonly used types in general-purpose electronics.

Technical Specifications

| Parameter | Value |

| ------------------------- | ------------------------ |

| Model | MF-A04 |

| Outer Diameter | 33 mm |

| Shaft Bore Diameter | 6 mm |

| Shaft Type | Round (smooth/knurled) |

| Compatible Potentiometers | WH118, WX050 series |

| Fastening Method | Set screw M3 (side) |

| Indicator | Line mark on top face |

| Surface Finish | Knurled side grip |

| Material | ABS Plastic |

| Color | Black |

| Mounting | Panel / PCB-mount shaft |

| Operating Temperature | -20°C to +70°C |

Key Features

• Precise 6 mm bore for a snug, wobble-free fit on standard potentiometer shafts

• 33 mm diameter provides comfortable finger grip and clear visual feedback

• Knurled circumference for secure, non-slip manual adjustment

• Top indicator line for easy position reading at a glance

• M3 set screw secures the knob firmly, preventing rotation slippage under use

• Compatible with the widely available WH118 and WX050 rotary potentiometer series

• Lightweight and durable ABS construction suitable for repeated use