Graco 108068 Straight Spring Pin

Graco 108068 Straight Spring Pin: Precision Engineered Microfastener for High-Load Pump Assemblies

The Graco 108068 Straight Spring Pin is a microfastener precision-engineered to secure piston, rod, and valve assemblies within high-pressure fluid pumping systems. Its nominal dimensions of 0.25 in. length by 0.2 in. diameter (0.25 x 0.2 x 1.2 in.), as specified in the manufacturer’s part sheet, ensure exact tolerance fit in bores and keyways. Manufactured from hardened, corrosion-resistant stainless steel, the pin delivers robust shear and bending strength to withstand cyclical loads and dynamic pressure pulses typical of advanced coating equipment. Integration into airless sprayer modules, including compatibility with the patented graco x7 airless paint sprayer, leverages the pin’s tight tolerances to maintain seal alignment and actuator stability under transient spikes up to 4,000 psi. Engineers favor this component for its minimal deflection under load, compact weight (0.001 lbs), and consistent fatigue performance across extended duty cycles.

• Precision 0.2 x 0.25 x 1.2 in. dimensions for exact bore fits
• Hardened stainless steel construction with C45–C50 Rockwell hardness
• Designed for cyclic loads exceeding one million actuation cycles

In high-demand pump replacement contexts, the 108068 spring pin exhibits superior mechanical resilience and repeatability. Engineers evaluate key performance metrics such as shear strength (exceeding 1,500 psi), average flexural stiffness, and endurance cycles in excess of 10⁶ load reversals. This robust performance enhances overall pump efficiency by minimizing micro-motion and wear at pin joints, thereby extending seal longevity and reducing maintenance intervals. The pin’s thin cross-section reduces hydraulic disruption and maintains laminar flow within critical fluid channels. Ideal for integration into systems utilizing hplv paint guns, the pin supports rapid actuation and consistent nozzle alignment under variable duty cycles. Its compliance with high-pressure filtration standards and corrosion resistance makes it a preferred choice for demanding professional coatings operations where particulate ingress and abrasion can compromise component life.

Design and Material Engineering

Material selection for the 108068 Straight Spring Pin centers on precipitation-hardening stainless steel (17-4PH) processed to a tensile strength of 150 ksi. Heat treatment protocols yield a uniform martensitic microstructure and Rockwell hardness rating of C45–C50, optimizing the balance between ductility and hardness. Precision milling and broaching operations maintain diameter tolerances within ±0.0005 in. across the full length. Cyclic load mapping under simulated pump actuation profiles confirms minimal creep and negligible microcrack propagation over full lifecycle test sequences. The high-yield composition ensures dimensional stability across temperature ranges from -20°F to 300°F, supporting operations in diverse climates and solvent-rich environments. Surface finishes are polished to 16 microinches to mitigate stress risers and enhance corrosion resistance. Such meticulous engineering ensures consistent performance in high-pressure, high-cycle environments typical of advanced coating equipment and airless sprayer assemblies.

Performance Metrics and Lifecycle

Lifecycle testing of the 108068 pin includes accelerated salt-spray exposure, dynamic shear cycling, and multi-point dimensional verification to ensure compliance with ISO 9001 quality management standards. High-pressure filtration tests reveal that the pin’s precision surfaces contribute less than 0.1% pressure drop in fluid pathways, preserving pump efficiency during continuous operation. Repetitive cycle tests at 3,500 psi demonstrate that components maintain 98% of initial hardness after 10⁶ cycles, evidencing exceptional wear resistance. Compatibility trials with graco spray rigs confirm stability under pulsed flow conditions and rapid solenoid actuation. Predictive maintenance models leverage these data to forecast component replacement intervals, reducing unscheduled downtime. Engineers can correlate fracture mechanics parameters with in-service inspection data to optimize replacement schedules and ensure uninterrupted coating line throughput.

Applications and Maintenance

Incorporation of the Graco 108068 Straight Spring Pin into fluid power modules enhances the reliability of professional-grade coating and transfer systems. Typical applications span high-volume manufacturing floors, automotive body shops, and industrial maintenance rigs where consistent seal alignment and valve actuation are critical. Maintenance best practices specify inspection of pin alignment and bore condition at each service interval, typically every 1,000 hours of operation or per pump rebuild cycles. Proper installation torque, generally 5–10 in-lbs, prevents deformation and maintains precise engagement. During replacement, technicians should verify the mating bores for burrs and apply appropriate lubrication to support insertion without friction-induced damage. The pin’s minimal mass and compact form factor simplify handling and reduce the risk of tooling interference. Integration with remote monitoring systems can track pin performance metrics and trigger alerts based on seal longevity projections and pump efficiency indicators, facilitating proactive maintenance in both field service and centralized production environments.