Sta-Rite 5P6R Impeller Lock Screw + Washer — R373376080 / 37337-6080

Genuine Sta-Rite / Pentair impeller lock screw with washer for the Sta-Rite 5P6R and SW5P4R / SW5P6R pool-pump family. This is the single stainless-steel bolt that fixes the impeller onto the motor shaft — small part, load-bearing job. Equivalent Pentair OEM reference 37337-6080.

Ships as a matched screw + washer set: the washer distributes clamping load across the plastic impeller hub so the screw doesn’t chew through the hub during operation. Do not reuse an old washer with a new screw or the other way round — the two pieces are engineered as a pair. Fits the whole Max-E-Glas II / Dura-Glas II / Dyna-Glas / Dyna-Max / Dyna-Jet TPE / WhisperFlo XF / IntelliFlo XF / IntelliPro VS 3050 range that shares the 5P4R / 5P6R shaft geometry.

Standard service item on any impeller replacement — always swap the screw + washer alongside a new impeller. A tired screw doesn’t fail dramatically; it slowly loosens under vibration until the impeller starts scuffing the diffuser and you’re back to a full service window. Torque hand-tight plus a quarter turn — over-torque cracks the plastic impeller.