The GRACO 551364 is a 3/4" stainless steel lock washer designed to secure fasteners and prevent loosening due to vibration or torque in GRACO equipment. It is typically made from corrosion-resistant stainless steel and is used in assemblies where reliable, long-term fastening is required.

Key Features:

• Lock Washer
• 3/4"
• Stainless Steel (likely 18-8 or 304 grade, based on industry standards for similar parts)
• Compatible with 3/4" bolts and nuts; suitable for use in GRACO equipment assemblies
• Split design for spring action and vibration resistance
• Corrosion-resistant material for harsh environments
• Reliable performance in high-vibration and torque applications

Applications:
Used in machinery assembly, industrial equipment, and any application within GRACO systems requiring secure fastening and resistance to vibration loosening.

Installation Notes:

• Using genuine GRACO parts ensures proper fit, function, and longevity of equipment, reducing the risk of fastener failure and equipment downtime.
• Install beneath the nut or bolt head with the split ends slightly offset
• Tighten the fastener to compress the washer, which helps prevent loosening
• Use with a flat washer when fastening softer materials or oversized holes for added support
• Regularly inspect lock washers for signs of wear, corrosion, or deformation
• Replace washers if they lose their spring action or show visible damage
• Ensure proper torque is applied during installation to maintain effectiveness