The GRACO 551363 is a 5/8" stainless steel lock washer designed to prevent fastener loosening due to vibration or rotation. It is typically used in GRACO equipment assemblies where secure fastening is required, especially in corrosive or demanding environments. The washer is constructed from stainless steel, offering corrosion resistance and durability.

Key Features:

• Lock Washer
• 5/8"
• Stainless Steel (SST)
• Fits 5/8" bolts; compatible with GRACO equipment requiring this size
• Split lock design for vibration resistance
• Corrosion-resistant stainless steel construction
• Suitable for use in corrosive or marine environments
• Reliable performance in high-vibration applications

Applications:
Used in GRACO equipment assemblies to secure fasteners, particularly in environments where vibration or corrosion is a concern. Suitable for general industrial, marine, and maintenance applications.

Installation Notes:

• Using genuine GRACO parts ensures proper fit, performance, and longevity of equipment. Non-genuine parts may not meet required specifications and could compromise safety or reliability.
• Place the lock washer between the nut and the flat washer or directly under the nut if no flat washer is used.
• Ensure the washer is seated properly to maximize vibration resistance.
• Inspect for wear or deformation before reuse.
• Use appropriate torque for the fastener to avoid over-compression of the washer.