The Graco 100644 Screw Cap Sch is a precision-engineered component optimized for demanding airless sprayer systems. This hex-head cap screw bolsters assembly reliability and supports high-pressure filtration to maintain peak performance under continuous use. Manufactured from hardened alloy steel, it offers superior corrosion resistance and mechanical strength. Quick to install and easy to service, it minimizes downtime during routine inspections. Ideal for integration into heavy-duty pumping stations, it ensures leak-free connections with tight tolerances crucial for securing graco paint gun parts.
Designed to enhance maintenance and upgrade routines, the 100644 Screw Cap Sch fits seamlessly into E20/EXP1 pump frameworks, delivering consistent torque retention. Its precise threading optimizes fluid dynamics, reducing turbulence and wear in your spray assembly. Combined with premium spray control modules and Graco Spray Tips, this component elevates atomization quality for uniform coverage. Trusted by professional coatings specialists, it extends equipment lifespan and ensures efficient, high-pressure operation in industrial and commercial settings.
$8.86The Graco 100644 Screw Cap Sch (100644) is a precision-engineered hex head cap screw designed specifically for integration into high-pressure pump assemblies used in professional airless sprayer systems. Manufactured from high-tensile alloy steel and subjected to advanced surface treatment processes, it ensures exceptional resistance to corrosion and mechanical fatigue during continuous operation. In demanding environments, this component plays a critical role in maintaining pump efficiency and supporting reliable seal longevity under cyclic loading. Detailed performance testing in conjunction with advanced high-pressure filtration modules demonstrates its capacity to withstand pressures exceeding 3,000 psi, ensuring consistent fluid delivery in coatings, adhesives, and sealant applications. Reference to Graco manuals provides comprehensive guidance on torque values, material certifications, and assembly procedures required for optimal performance.
Critical metrics such as tensile strength, hardness (Rockwell C45–C50 range), and surface finish quality are documented in the latest Graco engineering validation reports. Advanced finite element analysis (FEA) evaluates stress distribution within the screw shank and under the head face, ensuring minimal deformation and optimal clamp force under dynamic loads. Specialized elastomeric seals interfacing with this cap screw benefit from the controlled compression profile, which enhances seal longevity and mitigates leakage at high cycle counts. For a complete assembly breakdown, consult the official graco parts list found within technical bulletins and service guides.
The 100644 model features a standardized UNC thread profile for interoperability with E20/EXP1 pump housings. The major diameter tolerance conforms to ANSI B1.1 Class 2A, guaranteeing smooth engagement with corresponding 2B internal threads. A precision-machined chamfer at the thread lead improves initial alignment and reduces cross-thread risk during rapid assembly. Heat treatment to 1,200°F followed by oil quenching and tempering yields a hardened case with a core hardness gradient, offering enhanced wear resistance while maintaining core ductility. Surface phosphate conversion coating ensures uniform lubricant retention, which is critical for maintaining consistent clamp force and avoiding galling during repeated maintenance cycles.
In industrial settings, the 100644 screw cap serves as an essential fastener within airless sprayer pump modules employed for high-viscosity coatings, solvent-based polymers, and UV-curable materials. Its robust construction supports continuous operation in spray booths, concrete leveling projects, and metal pre-treatment lines. The hex head design allows for rapid disassembly and reassembly during routine maintenance, reducing downtime without compromising structural integrity. Field evaluations confirm compatibility with a range of Graco system upgrades and seal kits. Integration with advanced reciprocating pumps enhances fluid metering precision, ensuring uniform atomization across varied nozzle configurations. For detailed system integration diagrams, refer to graco sprayers section in product technical literature.
Maintenance protocols recommend the use of calibrated torque wrenches to achieve specified clamp loads, preventing under- or over-torquing that can lead to premature thread fatigue or component distortion. Application of approved thread-locking compounds further secures the fastener in high-vibration environments. Regular inspection intervals should include visual checks for corrosion, head surface wear, and thread deformation, with replacement triggered upon any deviation from specified tolerances. The 100644 screw cap is fully compatible with Graco pump modules, manifold blocks, and fluid end components, facilitating modular upgrades and extended service life of the spray system.
Overall, the Graco 100644 Screw Cap Sch exemplifies precision engineering optimized for high-pressure filtration systems and demanding coating applications. Its high-strength alloy composition, rigorous quality control, and precise manufacturing tolerances ensure reliable performance in professional coatings operations, maximizing pump efficiency while sustaining long-term seal integrity and operational uptime.
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