The Graco 108654 Hexagonal Head Cap Screw ensures reliable fastening for your airless sprayer systems and pump assemblies. Crafted from industrial-grade alloy steel, this cap screw withstands high-pressure filtration demands and rigorous professional coatings applications. Designed to integrate seamlessly with multiple Graco pump replacement components, it enhances durability and reduces maintenance downtime. Ideal for repair technicians seeking precision in every assembly, this part supports efficient setups and stronger performance across projects, making it a staple among graco paint gun parts essentials.
Whether you’re electrifying your workshop with an electric graco paint sprayer or servicing an airless sprayer, this cap screw delivers consistent torque and alignment. As a critical element in maintenance kits and component overhauls, it supports peak performance in demanding industrial environments. Pair it with cleaning tools and torque wrenches to maximize service intervals, while its precise hex head design ensures straightforward installation on site.
$14.03Graco model 108654 108654 Hexagonal Hd Cap Screw (Hex Hd) is a precision-machined fastener designed to secure high-pressure pump housings and manifold assemblies in industrial airless sprayer equipment. Featuring optimized hex-head geometry for enhanced torque distribution, this cap screw integrates seamlessly with graco pump parts to improve pump efficiency and reduce mechanical stress at connection points. Engineered for compatibility within professional coatings operations, the component also maintains alignment of filtration housings and manifolds to support consistent high-pressure filtration performance under repeated cycling conditions.
Precision tolerances define the head-to-shank transition radius and thread crest profile, ensuring uniform preload and minimizing micro-movements under oscillating load throughout the service life. The hex Hd cap screw is produced from high-strength 17-4 PH stainless steel, delivering exceptional yield strength and corrosion resistance in demanding environments. Fine surface finish to Ra 0.8 µm reduces galling and supports prolonged seal longevity within dynamic pump interfaces. This screw precisely mates with standard UNC threads and features a controlled chamfer to guide insertion and alignment.
Material selection for the 108654 cap screw relies on precipitation-hardening metallurgy to achieve tensile strengths exceeding 150 ksi. The 17-4 PH grade stainless steel base alloy undergoes solution heat treatment followed by aging at precise temperatures to optimize microstructure. This process yields superior hardness, ductility, and resistance to stress corrosion cracking. Dimensional tolerances conform to ANSI B18.2.1 standards, ensuring interchangeability with OEM components. Surface oxidation is minimized by passivation protocols that preserve metal integrity in aggressive coating environments.
Hex-head geometry is engineered to distribute clamping loads radially, reducing stress concentration at the screw-to-flange interface. Finite element analysis indicates that the 108654 head profile minimizes distortional stresses during peak pressure cycles common in airless sprayer manifolds. The thread form incorporates root-to-flank fillet radii to enhance fatigue life, enabling millions of cycles without compromise. Machining tolerances maintain gauge length and overall screw length within ±0.25 mm, guaranteeing dependable assembly alignment across diverse Graco pump assemblies.
During routine maintenance of spray cycles, service technicians often replace the hex-head cap screw as part of a retention hardware check. Integration within a standard graco gun repair kit ensures that workshop inventories maintain stock for immediate assembly. Clear torque marking on the hex face facilitates verification of proper clamp loads after reassembly. Replacement intervals align with pump overhaul schedules, preventing pressure leaks and maintaining optimal interface sealing. The screw’s consistent thread engagement reduces risk of galling during repetitive disassembly.
In quality assurance labs, the 108654 cap screw undergoes accelerated lifecycle testing to validate performance under cyclic pressures exceeding 4000 psi. Torque retention is measured before and after thermal cycling from -20 °C to 80 °C, verifying dimensional stability and thread-interface integrity. High-pressure filtration compatibility is assessed by subjecting assembled manifolds to particulate-laden fluids, confirming that the screw’s preload maintains seal compression and guard ring engagement. Data logging systems record torque-angle signatures for each batch, ensuring traceability and repeatable component performance.
Optimal torque specification for the Graco 108654 cap screw ranges from 25 to 30 ft-lb, depending on manifold thickness and gasket materials. Technicians apply anti-seize lubricants sparingly on the first two threads to minimize galling without compromising clamp force. Thread sealants can be used per system requirements to enhance leak prevention, but caution is advised to avoid excess cured material in high-pressure filtration passages. Always adhere to calibrated torque wrenches and incremental angle-turn methods to preserve seal longevity and structural integrity.
In complex professional coatings setups, clean incoming fluid is critical. Technicians integrate the 108654 screw assembly with filter manifolds that house fine mesh elements to trap particles down to 30 microns. Replacement of the screw must be synchronized with media change-outs to maintain system balance. When installing new filters, verify that the filter cap screw is torqued to spec, ensuring even compression of the gasket. Proper alignment prevents channelling and extends service intervals for both seal components and graco paint sprayer filters alike.
The Graco 108654 Screw Cap Hex Hd represents a cornerstone in high-pressure airless sprayer maintenance, marrying robust material science with precision dimensional control. Its integration into pump modules and filter assemblies elevates overall pump efficiency and seal longevity, while compatibility with professional coatings workflows ensures unparalleled performance consistency. Whether deployed in industrial contractors’ fleets or OEM refurbishment lines, this cap screw delivers reliable clamping force and sustained seal integrity under the most demanding high-pressure filtration scenarios.
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