Mayumi Auto
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The flat key is made of high-quality carbon structural steel or alloy structural steel and is precisely processed according to national standards. Its cross-section is rectangular, with the two sides being the working surfaces. It is mainly used for circumferential fixation between shafts and hubs, for transmitting torque and motion. The structure is simple, the centering is good, and the assembly is convenient.
The product undergoes quenching and fine grinding treatment, with high dimensional accuracy, smooth surface, tight assembly fit, uniform force distribution, resistance to shear, and wear resistance. It operates stably and reliably. It is widely used in reducers, motors, gearboxes, fans, water pumps, machine tools, and various mechanical transmission equipment.
The flat key is in the shape of a rectangular long strip, with a standard rectangular cross-section. Both sides are parallel working surfaces, which are the core part for transmitting torque. The upper and lower surfaces are non-working surfaces and are closely fitted to the shaft groove and hub groove without bearing torque. According to the shapes at both ends, there are three national standard styles, suitable for different installation scenarios:
| Style Category | Dimensional Specifications & Applications |
|---|---|
| Small Flat Key | b×h is 2×2, 3×3, 4×4, 5×5, length L: 6-50mm. Suitable for light-load transmission in miniature motors, small instruments, and precision equipment. |
| Standard Common Flat Key | Dimensions: 6×6 to 18×11. Length L: 10-160mm. Strong versatility for reducers, fans, water pumps, and machine tool spindles. |
| Heavy Flat Key | Dimensions b×h: 20×12 to 32×18. Length L: 40-250mm. Suitable for heavy-duty machinery, construction, and mining equipment with large torque transmission. |
