The GRACO 18B339 is a square key measuring 3/16" square by 3/4" in length. It is typically made of steel and is used as a mechanical fastener to secure rotating components such as pulleys or gears to shafts within GRACO equipment, ensuring reliable torque transmission and alignment.

Key Features:

• Square key
• 3/16" SQ X 3/4"
• Steel (assumed, not explicitly stated)
• Used in various GRACO equipment models (e.g., GrindLazer, as referenced in manuals)
• Precision fit for secure component attachment
• Durable construction for repeated use
• Standardized size for easy replacement

Applications:
Used in GRACO machinery to secure rotating components such as pulleys, gears, or couplings to shafts, ensuring proper alignment and torque transfer.

Installation Notes:

• Using a genuine GRACO key ensures proper fit, reliability, and safety in equipment operation.
• Ensure the keyway in both the shaft and the component are clean and free of debris before installation.
• Insert the key into the shaft keyway before sliding the component onto the shaft.
• Check for proper fit and alignment before tightening any fasteners.
• Inspect the key and keyway for wear or damage during routine maintenance.
• Replace the key if it shows signs of deformation or excessive wear.
• Use only genuine GRACO replacement parts for optimal performance and safety.