Graco 101926 Nut Lock

About the Graco 101926 Nut, Lock (1/2-20 NF)

Genuine Graco hardware lock nut for securing pump and proportioner assemblies under vibration.

Compatible Machines

• Graco 8900 Proportioner series — parts lists call out 101926 as “LOCKNUT; 1/2-20 NF”.
• Graco Hydra-Cat Proportioners (various fixed-ratio / President / King Hydra-Cat models) — manuals list 101926 “NUT, lock; 1/2-20 (nylon insert)”.
• Graco Bulldog / High-Volume Plural Component Pump assemblies — used on tie-rod/yoke connections where a 1/2-20 lock nut is specified.
• Other Graco pump, frame, and manifold assemblies that specify 101926 or a 1/2-20 NF lock nut in the OEM parts diagram (verify per model).

Key Features

• OEM fit: Genuine Graco part 101926 for precise fit and reliable torque retention.
• Locking design: Helps prevent loosening under vibration on high-pressure sprayer systems.
• Service-friendly: Common hardware across multiple Hydra-Cat and proportioner platforms.

Technical Specifications

Installation Tips

• Follow your machine’s service manual for torque specs and sequence.
• Inspect mating threads; replace if damaged or if locking feature shows wear.
• When noted by the OEM, apply thread lubricant or thread locker as specified.

Frequently Asked Questions