The Graco 115498 Screw is a precision-machined replacement part designed for demanding coating projects, fitting models such as the 390 PC Stand, Hi Boy 395 Ultra PC, and Ultra Max II series. Engineered with strict tolerances, it stabilizes nozzle pressure, minimizes seal leaks, and enhances fluid control within your airless sprayer, while supporting high-pressure filtration to maintain consistent flow rates and reduce system contamination.
Crafted from durable, corrosion-resistant steel with a secure washer interface, this screw features precise threading for repeatable installations and reliable performance across diverse jobs. Ideal for professional coatings operations, it withstands harsh chemicals and abrasive media, reduces downtime through simplified maintenance, and extends the lifespan of spray equipment for maximized productivity. Its optimized geometry helps maintain stable flow during extended work periods.
$6.3Engineered for precision integration with high-pressure fluid delivery platforms, the Graco 115498 Screw exemplifies robust manufacturing standards tailored to industrial-grade dispensing devices. Its hex and slotted head configuration ensures rapid torque calibration during assembly, streamlining maintenance procedures for complex pump assemblies. Machined from aerospace-grade stainless steel alloys, this fastener maintains dimensional stability under cyclic loads and corrosive environments. Designed specifically for the alignment of pistons and cylinders in airless sprayer paint pumps, the component delivers consistent valve seat engagement, enhancing pump efficiency across extended operational cycles. The screw also integrates vibration damping geometry to mitigate harmonic resonance in reciprocating assemblies, ensuring stable delivery of media under fluctuating pressure conditions.
Corrosion resistance and wear dynamics are optimized through advanced finishing techniques, enabling the screw to resist galling and fretting even under abrasive coating formulations. When sealing high-viscosity fluids, the fastener supports enhanced gasket compression, preserving professional coatings system integrity over thousands of cycles. Its precise thread pitch and surface roughness parameters minimize micro-leakage pathways, critical for applications demanding tight volumetric control. The robust washer interface also contributes to seal longevity by distributing clamping loads uniformly across mating surfaces. Additionally, its chemical compatibility spans both solvent-based and water-based media, making it suitable for two-component polyurethane and epoxy systems.
The thread geometry of the 115498 model incorporates proprietary flank angles that reduce insertion torque without sacrificing joint stiffness. This design lowers installation effort while maintaining a secure preload, critical for maintaining consistent stroke lengths in piston pumps. Integration with high-pressure filtration modules ensures particulate-free fluid delivery to the actuator chamber. Field tests indicate a 12% decrease in assembly time and a notable improvement in filtration throughput with the optimized screw profile, further bolstering high-pressure filtration performance in demanding industrial spraying applications. Surface micro-smoothing to below 0.8 microinch Ra further reduces particulate generation, complementing seal longevity in high-cycling environments and minimizing maintenance intervals.
Detailed specifications for the Graco 115498 include a hex head diameter of 12 mm, a thread pitch of 1.5 mm, and an overall length of 45 mm. Manufacturing tolerances hold to ±0.02 mm on critical dimensions, ensuring repeatable alignment with mating components. The selected stainless steel grade S304 offers a tensile strength exceeding 70 ksi and a hardness rating of 50 HRC, delivering outstanding wear resistance in high-cycle operations. Passivation treatment and electropolishing eliminate surface oxides, reducing frictional wear during torque application and enhancing component longevity. Post-machining heat treatment at 450°C for one hour refines grain structure, improving fatigue resistance. The head geometry incorporates chamfered edges to prevent stress concentrations and facilitate automated pick-and-place assembly.
Torque-tension correlation tests reveal a linear relationship up to a maximum torque of 25 N·m, beyond which the fastener exhibits predictable elastic elongation without yielding. Fatigue testing under simulated piston loads demonstrates endurance beyond 10 million cycles at a 1,200 bar pressure differential. Dimensional stability checks under thermal cycling between –20°C and 80°C show negligible change in thread geometry. Corrosion tests in salt spray chambers confirm zero pitting after 1,000 hours. Additionally, joint stiffness remains within 5% of baseline after exposure to 85% RH for 72 hours, validating resilience in challenging industrial environments. These rigorous assessments confirm the screw’s suitability for continuous-duty operations in high-demand fluid handling systems operating across diverse environmental conditions.
Installation of the Graco 115498 Screw is straightforward when using calibrated torque wrenches and compatible socket drives. Lubrication of the threads with a high-performance anti-seize compound reduces galling risks, especially in applications involving abrasive or chemically aggressive coatings. The screw is designed for seamless integration with Graco pump manifolds, mixer drives, and pressure vessels, optimizing dynamic load distribution for higher cycle counts. Its reliability makes it a preferred choice in advanced airless sprayer configurations and custom fluid delivery assemblies, supporting consistent flow control across professional coatings operations.
Scheduled inspections should focus on thread condition and head integrity, verifying that clamping surfaces remain free of burrs or deformation. Replacement cycles are recommended after 5,000 operational hours or upon reaching 90% of the specified torque threshold to maintain optimal pump efficiency. Proper torque application during reinstallation ensures consistent sealing behavior and eliminates potential leak points. By adhering to these guidelines, service technicians can extend component life and support uninterrupted operation in rigorous production environments, enhancing overall seal longevity and system reliability.
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