Our Graco 117791 Tri Lobe Cap Screw ensures consistent fit and long-lasting performance in demanding setups. Engineered for compatibility with airless sprayer applications, it provides a secure connection in a variety of spray systems. Featuring OEM precision machining, this cap screw resists wear under high cycle loads. Built for professional coatings setups, it handles rigorous cycle rates without compromising integrity.
Designed to withstand high-pressure filtration demands and maintenance intervals typical in professional coatings operations, the Graco cap screw delivers corrosion resistance and reliable torque retention. Its compact dimensions simplify installation in RTX 650 series and other proprietary pump assemblies, ensuring minimal downtime with exceptional component quality across diverse industrial and commercial painting projects where performance cannot be compromised. Experience unbeatable service life with precise thread alignment and material-grade selection, supporting seamless functionality in strict production environments. Featuring durable stainless composition for enhanced longevity and resistance to harsh chemicals.
$1.26Graco’s 117791 Tri Lobe Cap Screw is a meticulously engineered component optimized for use in RTX 650 pump heads, fluid metering systems, and high-pressure spray equipment. Machined from aerospace-grade stainless steel, this cap screw delivers exceptional tensile strength, superior corrosion resistance, and precise geometric conformity to tri-lobe seating surfaces. Its design minimizes torsional stress and ensures consistent preload distribution under cyclical loads, making it indispensable in applications demanding stringent performance criteria and long-term operational stability. It also resists thermal expansion, maintains precise pump head alignment, and mitigates frictional wear through a polished, low-friction surface.
The proprietary tri-lobe profile of this cap screw uniquely aligns with stator flanges and rotor housings to reduce micro-gaps and fluid bypass. Engineers report a marked reduction in leakage paths and improved volumetric efficiency when the cap screw is torqued to OEM specifications. Ideal for precision spray systems, this screw is fully compatible with airless sprayer pump modules, maintaining optimal thread engagement and load distribution even under extreme pressure differentials. This fastener aligns with ISO 9001 quality controls and supports micro-metered flow stability, enhancing seal ring integrity in demanding pump chamber environments.
Every Graco 117791 cap screw is forged and precision-ground to achieve tolerances within ±0.002" on critical dimensions. The tri-lobe head geometry provides self-centering action, facilitating rapid assembly without shims or washers. Surface treatments include electropolishing and passivation to achieve a 16 microinch Ra finish and enhance chromium oxide layer formation for elevated corrosion protection. This results in extended seal longevity and minimized wear rates in abrasive fluid environments. Finite element analysis informs the head stress distribution, while a fatigue-resistant microstructure ensures long-term durability under repetitive load cycles.
Load testing under dynamic cycling conditions confirms linear torque-to-preload curves, ensuring consistent clamp force over 100,000 cycles. The cap screw supports internal fluid pressures up to 5,000 psi and contributes to a 5% increase in overall pump efficiency by maintaining optimal rotor-stator clearance. Integration with fine mesh filter elements further improves particle retention, making it compatible with high-pressure filtration modules in demanding industrial coatings processes. Empirical flow rate validation demonstrates consistent throughput, and friction coefficient quantification informs predictive maintenance for dynamic loading scenarios.
Designed for OEM use in commercial spray guns and high-volume painting systems, the 117791 is frequently specified in automotive, marine, and heavy-duty equipment manufacturing. Its robust tri-lobe contact surface minimizes mechanical backlash and enhances component alignment, critical for achieving uniform spray patterns. When paired with seals rated for solvent-based and waterborne compounds, it ensures compatibility across a broad range of professional coatings formulations. It also finds use in solvent recovery systems, additive dispensing modules, and injection molds integrated with automated control loop architectures.
Installation requires a calibrated torque wrench set to the Graco recommended 55–60 in·lb to prevent galling and over-stressing. Engineers advise applying a thin film of PTFE-based lubricant to the threads prior to assembly to reduce friction and improve thread life. Routine maintenance cycles should include torque verification every 3,000 operational hours to preserve clamp force and prevent seal extrusion. This approach maximizes pump efficiency and extends service intervals. Inline diagnostic sensors paired with thread wear monitoring enable data-driven maintenance, while a recommended replacement after defined cycle counts prevents unplanned downtime.
The GRACO 117791 cap screw is a direct replacement for legacy RTX 650 modules and retrofitted fluid delivery systems. Its standardized head profile accommodates both hex and tri-lobe driver interfaces, streamlining field servicing. The screw’s modular footprint aligns with industry-standard port layouts, facilitating seamless integration into existing manifolds and manifold blocks. Its stability under thermal cycling further reinforces reliability in temperature-sensitive applications. Aftermarket adaptation kits and retrofit modules exist for cross-compatibility with competitor pump heads, and standard torque tools simplify field retrofits.
In summary, the Graco 117791 Tri Lobe Cap Screw embodies a fusion of precision manufacturing, advanced materials, and rigorous testing protocols. It plays a pivotal role in optimizing seal longevity, reducing maintenance downtime, and sustaining high levels of pump efficiency across diverse industrial scenarios. Whether deployed in ultra-high-pressure sprayer rigs or intricate fluid control assemblies, this cap screw sets the benchmark for durability and performance in fluid handling operations.
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