The GRACO 16U977 is a jam nut, typically made from metal, designed to secure and lock components in place within GRACO pump assemblies. Its primary function is to prevent loosening of threaded connections under vibration or pressure, ensuring reliable operation of GRACO equipment.

Key Features:

• Jam Nut
• 16U977
• Compatible with select GRACO pump assemblies (e.g., 680cc Pump Lower)
• Secures threaded connections
• Prevents loosening under vibration or pressure
• Standardized for GRACO equipment

Applications:
Used in GRACO pump assemblies to secure and lock threaded components, such as in the 680cc Pump Lower and similar models.

Installation Notes:

• Using genuine GRACO parts ensures proper fit, function, and safety within GRACO equipment.
• Thread the jam nut onto the component until it bottoms out
• Torque to manufacturer specifications if provided (e.g., for similar nuts, torque may be specified as 70 ± 5 in-lb / 7.9 ± 0.5 N•m in some GRACO manuals)
• Ensure all related components are properly aligned before tightening
• Inspect for wear or damage before installation