Graco 120091 Hex Washer Head Screw 1/4-20 x 2 Inch

Graco 120091 Hex Screw Overview

Compatible Machines

• Graco Ultra Max 750
• Graco ProXChange PFX
• Graco HVLP ProMix Series
• Graco Pressure-Control Valves
• Graco Seal Plate Assemblies

Product Description

The Graco 120091 Hexagonal Head Screw 1/4-20 x 2 is a precision fastener for high-performance airless sprayers. Designed for demanding pump assemblies, it supports high-pressure filtration systems, maintains seal integrity, and ensures consistent torque control.

• Thread Size: 1/4-20
• Length: 2 inches
• Material: Hardened AISI 4140 alloy steel with phosphate & nickel plating
• Hex Washer Head: Ensures uniform pressure distribution
• Thread-Forming Design: Eliminates need for pre-tapped threads

Key Features

• Precision-machined for high tensile strength
• Self-threading flutes minimize material displacement
• Optimized for high-pressure diaphragm and piston pump applications
• Maintains consistent fluid pressure and reduces leakage
• Corrosion-resistant for long-term service life

Installation & Maintenance Tips

• Use a calibrated torque wrench to prevent galling
• Apply PTFE or molybdenum disulfide anti-seize for easier removal
• Inspect and re-torque every 500 operational hours
• Keep washer interface clean from debris and coating residues

Frequently Asked Questions