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Graco 115322 4mm External Lock Washer

The Graco 115322 External Lock Washer 4 mm is a small but critical OEM‑specified washer used to lock bolts and screws securely — ensuring that assemblies in Graco spray or pump equipment stay tight and resist loosening under vibration or stress.

  • External‑tooth lock washer — bites into bolt head/nut and surface for secure hold
  • Used with 4 mm bolts/screws in Graco equipment
  • Prevents loosening due to vibration or motion — maintains assembly integrity
  • Essential for maintenance or rebuilds to ensure safe, reliable bolted joints

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About the Graco 115322 4 mm External Lock Washer

The Graco 115322 External Lock Washer is an OEM-specified 4 mm external-tooth lock washer — designed to work with screws or bolts in Graco spray, pump and fluid-handling equipment to prevent loosening under vibration or load.

When & Where to Use

  • Bolted joints and assemblies in Graco spray/pump systems where vibration or motion could loosen fasteners
  • Frame, housing, component or bracket bolts in pumps, sprayers or coating machines requiring secure fastening
  • Replacement or maintenance — when original lock-washer is missing, worn out, stripped or damaged
  • Any application using 4 mm screws/bolts where extra locking security is needed

Product Details

Part Number 115322
Type External-Tooth Lock Washer (4 mm)
Function Prevents nuts/bolts from loosening — locks fastener in place via teeth grip and spring tension
Typical Use Spray, pump or fluid-handling equipment; any bolted joint subject to vibration or stress
OEM Status Original Graco part — ensures correct size, fitment and compatibility for Graco assemblies

Why Use This Lock Washer?

  • Prevents loosening of bolts/screws due to vibration, pressure pulsation or repeated use
  • Provides better grip than flat washer or plain nut — external teeth bite both fastener and surface for secure lock
  • Uses correct 4 mm specification to match Graco bolts/fasteners — ensures proper fit and safe assembly
  • Recommended for maintenance, repair, or rebuilds to restore secure connections and avoid failures under load

Frequently Asked Questions

External-tooth lock washer’s teeth dig into both the fastener head (or nut) and the mating surface — giving stronger locking and preventing screws/bolts from loosening when equipment vibrates or moves.

You could — but plain washers don’t resist loosening under vibration or motion. External-tooth lock washers like 115322 provide better locking security for dynamic or load-bearing assemblies.

Replace if teeth are worn, flattened or if bolt/nut loosens frequently — worn lock washers lose their locking action and can compromise joint integrity.

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