1. Anti-Rotation Design

Engages with a D-shaped bore in the mating part to form a slip-free connection

Prevents relative rotation during transmission

2. Simple and Reliable Structure

Consists of a cylindrical body with a single machined flat surface

Simple manufacturing process and low cost

3. Quick Positioning

No need for keyway alignment during assembly—only the flat surfaces need to match

Facilitates easy installation and maintenance

4. Torque Transmission

Transmits substantial torque through contact between the flat surface and the bore wall

Suitable for low-to-medium power transmission applications

5. Diverse Material Options

Common materials include 45# steel, stainless steel, etc.

Surface treatments such as heat treatment or plating are available

6. Wide Range of Applications

Standard configuration for motor output shafts

Coupling connections

Fixing of handles and knobs

Synchronous belt pulleys and gear drives

Positioning pins and guide shafts

Typical Specification: Usually denoted as "D-Shaft, Ø10mm with 8mm flat" (10mm diameter, 8mm flat width), with dimensions and tolerances customizable to specific requirements.