Graco 118871 Lock Nut 1/2-20

Precision Lock Nut for High-Pressure Sprayer Assemblies

Compatible Machines

Product Overview

The Graco 118871 Nut Lock 1/2-20 is engineered for high-pressure sprayer assemblies, offering secure thread engagement, corrosion resistance, and minimal dead volume. It ensures leak-proof connections and maintains performance under vibration and cyclic loading.

• Thread Size: 1/2-20 UNF for industry-standard compatibility
• Compact Dimensions: 0.25" × 0.75" × 0.75" to fit tight assemblies
• Lightweight: 0.03 lbs for minimal equipment bulk
• Corrosion-resistant nickel-chrome plating for durability
• Precision-ground threads reduce galling and enable quick installation

Design & Materials

• High-strength alloy steel with uniform plating thickness of 15–20 microns
• Chamfered entry for easy assembly
• Surface finish Ra ≤ 0.8 µm minimizes friction
• Compact footprint reduces dead volume by 12% in fluid heads

Performance Metrics

• Recommended torque: 18–22 ft-lbs
• Axial clamping force > 600 lbf
• Fatigue life > 200,000 cycles at 15,000 psi
• Temperature range: -40°F to 350°F
• Negligible loosening at vibrations up to 500 Hz

Applications & Maintenance

• Securing fluid-head assemblies in airless paint systems
• Compatible with manifold adapters on RTX 1500 series pumps
• Supports high-pressure spraying above 2,000 psi
• Routine maintenance: quick disassembly, inspection, and lubrication with anti-seize compounds

Frequently Asked Questions