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Graco 120348 Socket Head Cap Screw with Nylon Patch

The Graco 120348 Screw Cap SCH w/ Nylon Patch provides secure fastening and vibration resistance for Graco airless sprayers.

  • Part Number: 120348
  • Type: Socket Head Cap Screw with Nylon Patch
  • Material: Alloy Steel, Black Oxide Finish
  • Thread Size: M6 × 1
  • Feature: Self-locking Nylon Patch for secure hold

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Graco 120348 Screw Cap SCH w/ Nylon Patch – Precision Fastening for Airless Sprayers

Compatible Machines

  • Graco Ultra Max II 490 / 495 / 595
  • Graco 390 PC Airless Paint Sprayer
  • Graco Ultra 395
  • Graco GMAX II 5900
  • Graco LineLazer 3400

Product Description

The Graco 120348 Screw Cap SCH w/ Nylon Patch is a high-strength socket head cap screw engineered for precision sealing and vibration resistance in airless sprayers. Its built-in nylon patch provides a self-locking feature, maintaining consistent torque and preventing loosening under high-pressure and high-vibration conditions.

Key Features

  • High-tensile alloy steel construction for superior strength
  • Nylon patch locking mechanism eliminates the need for lock washers
  • Corrosion-resistant black oxide finish
  • Precision-machined threads ensure tight sealing and easy installation
  • Complies with ISO 4762 standards for consistent quality

Technical Specifications

Specification Details
Part Number 120348
Type Socket Head Cap Screw with Nylon Patch
Material Alloy Steel with Black Oxide Finish
Thread Size M6 × 1
Torque Range 15–20 in-lb
Pressure Compatibility Up to 3000 psi systems
Manufacturer Graco Inc., USA

Applications

The Graco 120348 Screw Cap is used in airless sprayer pump and manifold assemblies to maintain sealing pressure and prevent fastener loosening during high-pressure operations. Ideal for both commercial and industrial paint sprayers requiring precision fastening and long-term reliability.

Frequently Asked Questions

The nylon patch acts as a self-locking mechanism that maintains consistent torque, preventing loosening under vibration and pressure changes.

Yes, it fits several Graco airless sprayer models, including Ultra, Ultra Max II, GMAX, and LineLazer series using standard M6 fasteners.

Install by hand-threading first, then tighten using a torque wrench to 15–20 in-lb. Avoid over-tightening to maintain nylon patch integrity and thread life.

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