Ensure peak performance of your airless sprayer with the Graco 120091 hexagonal head screw, designed to support high-pressure filtration systems and durable pump assemblies. Optimize your graco paint sprayer parts list by replacing worn fasteners with this reliable thread-forming screw, engineered to withstand professional coatings applications and heavy-duty cycles. Ideal for rebuild kits, it enhances seal integrity under extreme pressures.
Engineered for demanding environments, this hex washer head screw offers consistent torque control and long-term service life. Integrate seamlessly with your graco spray equipment to maintain efficient fluid delivery, minimize downtime, and ensure optimal performance in every project. Compatible with a wide range of sprayer models and fluid sections, it supports precise flow regulation and quick disassembly for inspections.
$12.26The Graco 120091 Hexagonal Head Screw 1/4-20 X 2 is a critical fastener engineered to integrate seamlessly into high-performance fluid handling equipment. Designed for use in demanding airless sprayer assemblies, this thread-forming screw provides robust clamping force while maintaining precise alignment of components exposed to viscous coatings. Its hex washer head profile allows for uniform load distribution, helping to enhance pump efficiency and extend seal longevity under high operating pressures. Technicians can reference official Graco manuals for recommended torque settings, ensuring optimal performance when applying professional coatings in industrial environments.
The 120091 screw is manufactured from hardened AISI 4140 alloy steel with a proprietary phosphate and electroless nickel plating that resists corrosion, galling, and solvent attack. The material selection strikes a balance between ductility and yield strength, supporting extended duty cycles in high-pressure filtration modules. With a nominal diameter of 1/4 inch and 20 threads per inch, the self-forming design exhibits exceptional resistance to loosening under vibration, contributing to prolonged seal longevity in diaphragm and piston pump applications. When identifying replacement components, consult the graco parts list to ensure compatibility with your pump housing, valve manifold, and filter bowl assemblies.
The thread-forming geometry of the 120091 screw eliminates the need for pre-tapped threads, enabling direct installation into lightweight aluminum and composite manifolds at production speeds. Precision helical flutes refine mating thread profiles during insertion, reducing installation torque by up to 15% while preserving material integrity and minimizing stress concentrations. This optimized engagement enhances pump efficiency by maintaining consistent fluid pressure and reducing internal leakage pathways. Quantitative torque-tension curves provided in technical data sheets demonstrate a linear relationship between applied torque and clamp load up to 90% of yield strength. Engineers appreciate the repeatable performance of the self-tapping design, particularly in systems where frequent maintenance cycles require rapid disassembly and reassembly without compromising structural rigidity or operational uptime.
Proper installation of the hex washer head screw requires a calibrated torque wrench set to manufacturer specifications to prevent galling or thread distortion. During routine maintenance, cleaning around the screw head and washer interface is essential to prevent buildup of encapsulated coatings, particulate debris, and resin residues. Technicians familiar with graco sprayers will recognize the importance of applying a compatible PTFE-based or molybdenum disulfide anti-seize compound on the threads to facilitate future removal and preserve torque accuracy. Maintenance schedules typically recommend inspection and re-torquing after every 500 operational hours or after solvent flush cycles to maintain optimal clamping force and prevent clamp relaxation in high-temperature environments.
In high-volume production environments, the 120091 screw demonstrates consistent installation torque variances within ±2% of nominal values, aligning with ISO 16047 standards for torque-controlled fastening. Its robust mechanical properties enable deployment in airless sprayer pump modules that handle a wide range of solvents and professional coatings, including epoxies, urethanes, acrylics, and heavy-body sealants. Field tests indicate negligible elongation under cyclical loading exceeding one million cycles at 3000 psi, underscoring the component's reliability in repetitive pressure cycles. Comparative data against standard tapped fasteners reveals up to 30% longer service life and improved dynamic seal seating. This performance metric is critical for quality control in automated dispensing systems where any fastener failure can lead to production downtime or material wastage.
Compatibility extends across multiple Graco pump series, including the Ultra Max® 750, ProXChange™ PFX, and HVLP ProMix lines, as well as pressure-control valves and seal plate assemblies. The 120091 screw can secure filter housings in high-pressure filtration units while maintaining structural integrity under rapid pressure changes and thermal cycling from -20°C to 125°C. In automated spray booths, this fastener ensures that manifold blocks remain leak-free, supporting uniform fluid distribution across spray nozzles for consistent atomization. Engineers can integrate this component into complex fluid circuits using modular designs without custom modifications, leveraging common thread engagement for streamlined maintenance and rapid part replacement in OEM and retrofit installations.
The Graco 120091 Hexagonal Head Screw 1/4-20 X 2 represents a fusion of precision engineering and material science, delivering reliable performance in demanding spray and fluid control systems. Its thread-forming capability, combined with a corrosion-resistant finish and optimized washer interface, secures critical pump and valve components with unparalleled consistency. For rigorous applications requiring minimal downtime, this screw remains a vital element in high-pressure fluid management architectures.
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