Graco 115494 Phillips Pan Head Machine Screw

Performance-Engineered Graco 115494 Pan Head Phillips Machine Screw for High-Pressure Fluid Systems

The Graco 115494 Pan Head Phillips machine screw sets an industry standard for precision component integration within high-performance fluid delivery systems. Featuring a 1.2-inch (3.048 cm) overall length and matching head diameter, this fastener is meticulously manufactured to ensure consistent clamping force across critical pump assemblies. The pan head geometry combined with the Phillips drive optimizes drive engagement while minimizing cam-out during high-torque installation. Crafted to interface seamlessly with Graco’s airless sprayer manifolds and gear drives, the 115494 screw provides a reliable foundation for stable fluid passage and pressure containment.

• Precision-machined 1.2-inch length and diameter specifications for exact alignment in internal pump assemblies.
• Material grade selection optimized for corrosion resistance under high-pressure conditions.
• Pan head design providing uniform load distribution across mounting flanges.

Mechanical Design Optimization

Engineered with tight tolerances and a standardized ANSI B18.6.3 thread profile, the 115494 screw exhibits superior load distribution under dynamic loading conditions. The head height and flange radius are controlled within ±0.05 mm to maintain even seating against sealed surfaces and to mitigate stress concentrations. Drive pocket dimensions are precision-machined to ISO 8764-1 specifications, which enhances torque transfer efficiency and reduces the risk of thread stripping in high-pressure applications. The robust flared flange design supports enhanced clamping, improving stability in reciprocating pump assemblies.

Material Selection and Surface Treatment

Constructed from 18-8 stainless steel with a minimum tensile strength of 80 ksi (551 MPa), the 115494 screw resists galling and exhibits excellent performance even under corrosive environments. Optional zinc passivation or trivalent chromium finish provides additional protection against chloride-induced stress corrosion cracking, extending seal longevity and mechanical life. Each screw undergoes a controlled shot-peening process to refine surface grain structure, resulting in improved fatigue resistance and consistent hardness above 28 HRC. These treatments ensure compatibility with professional coatings and sealants used in fluid system assembly.

In advanced airless sprayer and pneumatic diaphragm pump systems, the Graco 115494 screw plays an integral role in securing end caps, valve plates, and filter housings. Its pan head design ensures a flat bearing surface, reducing the risk of gasket extrusion and enhancing high-pressure filtration efficiency. Consistent thread engagement coupled with low profile head clearance supports tight assembly in compact pump gearbox enclosures. The part’s precision dimensions contribute to uniform preload, optimizing pump efficiency and minimizing vibration-induced wear on critical O-rings and dynamic seals.

Performance Metrics and Quality Control

Each Graco 115494 screw is subjected to rigorous quality assurance protocols including torque-tension curve analysis, surface hardness testing, and dimensional inspection via coordinate measuring machines (CMM). Average installation torque ranges between 20–25 in-lb (2.3–2.8 Nm), guaranteeing secure clamping without overstress. Shear strength measurements exceed 60 ksi, while fatigue life testing demonstrates endurance beyond 1×10^5 cycles under alternating tensile loads. Volume tolerances are held within 0.001 ft³ per batch to accommodate precision sealing cavities within pump modules without compromising fluid integrity.

Installation and Maintenance Guidelines

For optimal performance, lubricate machine threads with a compatible assembly paste to reduce frictional torque and prevent galling during installation. Utilize a calibrated torque wrench set to the manufacturer-specified range to preserve thread integrity and to avoid over-compression of sealing elements. If vibration resistance is required, apply a medium-strength anaerobic threadlocker on the first three engaged threads. Regular inspection intervals of 6–12 months are recommended to verify torque retention, and any signs of head deformation or corrosion should prompt immediate replacement to maintain system reliability.

In summary, the Graco 115494 Pan Head Phillips machine screw embodies a blend of meticulous materials engineering, precision manufacturing, and rigorous performance validation. By delivering consistent preload, superior corrosion resistance, and compatibility with high-pressure fluid systems, it ensures extended service life in demanding industrial environments. Whether applied within professional coatings equipment, high-pressure filtration modules, or advanced airless sprayer assemblies, this screw remains a critical component for maintaining operational excellence and prolonging overall pump system durability.