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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 :contentReference[oaicite:6]{index=6}

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 :contentReference[oaicite:7]{index=7}
  • 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. :contentReference[oaicite:8]{index=8}

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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