Oregon 18" Gator G5 Mower Blades 3-Pack (596-344) — 5/8" Center Hole, 1" Lift for Jacobsen 390665

These are three brand-new Oregon Gator G5 mower blades (part #596-344), 18" long with a 5/8" center hole, designed to replace Jacobsen part 390665 for a reliable, durable cutting performance.

If your Jacobsen mower calls for part number 390665 or you need an 18" Gator G5 replacement blade, this three-pack from Oregon supplies consistent cutting geometry, factory-grade steel, and the exact fit specifications operators expect. The Gator G5 profile is engineered for efficient grass discharge and long wear life on commercial and residential decks. Below you will find practical details about compatibility, installation, and performance so you can confirm this set matches your machine and mowing needs.

How do I know these blades fit my mower?

Confirm fit by matching the part number, overall length, and center mounting hole. These blades are sold as Oregon part 596-344 and are stated to replace Jacobsen 390665, so cross-referencing your mower’s manual or current blade will verify compatibility.

• Length: 18 inches overall
• Center hole diameter: 5/8 inch
• Blade width: 3.00 inches
• Thickness: 0.203 inches
• Lift: 1 inch (Gator G5 profile)

What performance can I expect from the Gator G5 profile?

The Gator G5 is shaped to lift and shear grass effectively, producing a cleaner cut and improved clipping management compared with generic flat blades. Its geometry balances airflow and cutting force to help reduce tearing and extend edge life under normal mowing conditions.

• Enhanced lift for better clipping control
• Engineered edge for longer wear between sharpenings
• Consistent airflow to avoid clumping in the deck

How difficult is installation and what hardware do I need?

Installation is straightforward for anyone comfortable removing a deck blade: secure the mower, remove the spindle bolt, swap the blade and torque to manufacturer spec. No special tools are required beyond a wrench or socket that fits your spindle bolt and proper safety equipment.

• Required: wrench/socket for spindle bolt
• Recommended: torque wrench to factory specification
• Tip: mark blade orientation before removal to maintain cutting direction

How long will a blade pack last and when should I replace them?

Blade life depends on terrain, debris, and maintenance frequency; operators mowing clean turf with regular sharpening can expect extended service life. Replace blades when edges become rounded, chipped, or when cutting quality noticeably declines.

• Replace after major impacts, visible cracks, or bent sections
• Sharpen or rotate blades to extend usable life
• Keep spare blades on hand to avoid downtime on busy days

Who is this for: This Oregon 3-pack of 596-344 Gator G5 blades is aimed at property managers, lawn care professionals, and homeowners using Jacobsen-compatible decks who want OEM-quality replacements. It suits anyone needing the exact 18" length, 5/8" center bore, and 1" lift profile for cleaner cuts and reliable deck fitment. Purchasing a three-pack is practical for multi-deck fleets or as stocked spares for regular maintenance intervals.