Standard key and keyway dimensions from shaft diameter — key width, key height and keyway depth per DIN 6885 / ISO 773. Enter the shaft size and key type.
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Request a Proposal →Keyways transmit torque between shafts and hubs via a square or rectangular key. The keyway dimensions are standardised based on shaft diameter. This calculator provides approximate key and keyway sizes for common shaft diameters.
The keyway is the slot in the hub (gear, pulley). The keyseat is the slot in the shaft. Together they house the key, which prevents relative rotation. The depth of each is approximately half the key height.
Cold-drawn low-carbon steel (C1018-C1045) is standard. For high-torque applications, use alloy steel (4140, 4340) hardened to 28-32 HRC. Stainless keys (304, 316) are used in corrosive environments. The key should be slightly softer than the shaft to be the sacrificial wear component.
Keys are simpler and cheaper for low-to-medium torque (under ~500 Nm on a 50 mm shaft). Splines handle higher torque, allow axial sliding, and provide better concentricity. Use splines for automotive transmissions, aircraft actuators, and high-speed rotating assemblies.
Enter the shaft diameter. The calculator suggests standard key width, key height, and keyway depth based on common ISO/ANSI proportions. Always verify against your specific standard (DIN 6885, ANSI B17.1, JIS B1301) for critical applications.
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