The Graco 112406 Hexagonal Head Cap Screw ensures precise fitment and long-lasting performance in demanding finishing systems. This critical component supports airless sprayer mechanisms by maintaining secure alignment under heavy duty cycles and high-pressure filtration requirements. Crafted from hardened steel with corrosion-resistant treatment, the screw excels in professional coatings applications. Ideal for maintenance teams and field technicians, it guarantees optimal torque retention and reliable connection within high-output equipment like a spray paint gun graco.
With its standard 0.75-inch length and 0.45-inch diameter, the Graco 112406 screw installs seamlessly into existing frameworks, minimizing downtime during service operations. Designed for direct integration with industry-leading pump assemblies, this hexagonal head cap screw withstands vibration and pressure fluctuations common in heavy-use environments. Technicians appreciate its straightforward installation and consistent torque specifications, ensuring structural integrity throughout frequent rigorous cycles. Upgrade your tools with this essential element of any robust graco paint sprayer system.
$6.3The Graco 112406 Hexagonal Head Cap Screw is a critical fastener engineered for ultra-precision retention in high-pressure fluid delivery modules. It features a 3/8-inch nominal diameter, a coarse full-thread pitch, and strict compliance with SAE J429 Grade 10.9 tensile specifications. The hexagonal head geometry accommodates both manual and automated torque applications, ensuring consistent clamp force distribution and mitigating thread galling. A proprietary phosphate finish and secondary passivation deliver enhanced corrosion resistance, bolstering seal longevity within demanding solvent-based systems. Designed for seamless integration into advanced airless sprayer assemblies and high-pressure filtration manifolds, this cap screw facilitates rapid assembly cycles while maintaining stringent concentricity and alignment tolerances under dynamic pressures exceeding 3000 psi.
Within precision pump and manifold subassemblies, the Graco 112406 cap screw secures manifold blocks, fluid filter housings, and hydraulic couplings with unwavering clamp loads. The coarse 16 TPI thread profile enables rapid engagement for accelerated maintenance cycles, while the hex head design accommodates both standard wrenches and torque-limiting socket drivers. Utilized extensively in diaphragm modules, piston pumps, and high-volume spray headers, it is a core fastener in graco replacement pump rebuild kits, delivering superior vibration damping and zero-slip reliability in reciprocating and rotary pumps under dynamic loads up to 3500 psi.
Constructed from SAE J429 Grade 10.9 carbon steel, the 112406 Hexagonal Head Cap Screw undergoes a proprietary quench-and-temper cycle to impart a minimum tensile strength of 150 ksi and yield strength of 120 ksi. A phosphate conversion coating followed by chromate passivation ensures robust corrosion protection even in solvent-laden environments. Dimensional tolerances are held within 0.01″ on head height and hex flat width, guaranteeing uniform stress distribution under load. Optimal friction coefficients allow precise torque-tension correlation, enhancing pump efficiency and extending seal longevity. Inline compatibility with paint spraying equipment and downstream high-pressure filtration modules makes this screw essential for continuous-duty professional coatings operations.
Detailed design parameters include a 0.45-inch hex width across flats with a head height of 0.20 inches and a 0.75-inch overall length. The 3/8″-16 UN coarse thread maintains a class 2A fit for optimal engagement, with root radius optimized to resist stress risers. ANSI B18.2.1 dimensional standards form the basis of all machining checks, while bore chamfers and underhead radii are precisely controlled to minimize localized stress. Torque specifications range from 25 to 30 ft-lb in dry applications and 18 to 20 ft-lb with lubrication. These design details ensure compatibility with power torque wrenches and pneumatic drivers and support the integrity of professional coatings systems.
During assembly, technicians should apply a thin film of anti-seize compound to the threads to prevent galling and ensure repeatable clamp loads during disassembly cycles. A calibrated torque wrench yields precise preload, critical for maintaining gasket compressive stress and preventing fluid bypass. Recommended maintenance intervals align with pump service schedules, typically every 400 hours of operation. Proper implementation of thread lubricant directly enhances pump efficiency and seal longevity, reducing downtime in continuous-duty operations. This cap screw is fully compatible with pneumatic install tools found in graco magnum x5 parts service kits and other professional-grade sprayer platforms, ensuring reliable performance in both field and factory environments.
Extensive testing under cyclic loading confirms a fatigue life exceeding one million cycles at 80% of yield strength, while static tensile testing records ultimate strengths above 150 ksi. Shear capacity is certified for axial loads up to 12,000 lbf, and torque-to-yield consistency falls within a 5% variance window. Material composition analysis validates carbon content at 0.40–0.48% and silicon-manganese deoxidation to industry standards. Surface roughness is maintained below Ra 32 microinches to optimize torque control and minimize wear on adjacent sealing surfaces. Integration within modern airless sprayer architectures and high-pressure filtration heads benefits from these quantifiable performance metrics, positioning the 112406 cap screw as a benchmark in fluid handling hardware.
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