Stens 340-066 PK2 Mulching Blade, Set of 4

What It Is

The Stens 340-066 PK2 is a set of four 18-inch mulching blades designed for zero-turn mowers with 72-inch decks. They replace OEM blades on select Gravely, Ariens, and Bob-Cat models, and are intended for fine-clipping mulching rather than bagging or side-discharge.

Fitment & Compatibility

Before buying, confirm your mower has a 72-inch deck that uses four blades (common on commercial zero-turns). The blade length is 18 inches, center hole diameter is 1 inch, and the drive hole pattern is a 5-point star. Stens lists these as direct replacements for Gravely OEM part 00041700, Ariens 07201600, and Bob-Cat 07201600. However, check your mower’s blade bolt size (typically 5/8-inch or 3/4-inch) and ensure the blade thickness (0.203 inch) matches your spindle clearance. Not all 72-inch decks use the same blade pattern—measure your existing blades before ordering.

Key Things to Know

• Quality concerns: With a 3.6 rating from only 7 reviews, some users report these blades are thinner or less durable than OEM, potentially leading to faster wear or bending on rough terrain.
• Installation: Straightforward if you have a torque wrench and blade removal tool. Tighten bolts to manufacturer spec (usually 70-90 ft-lbs). Do not overtighten or use impact drivers, as this can warp the blade or strip threads.
• Mulching only: These are not designed for bagging or side-discharge. If you frequently switch between cutting modes, consider a universal or convertible blade set.
• Balance check: Always balance new blades before installing. Unbalanced blades cause vibration, spindle damage, and poor cut quality.

Should You Buy It

Buy the Stens 340-066 PK2 if you need an affordable mulching blade set for a 72-inch commercial zero-turn and are willing to accept potentially shorter lifespan than OEM. Skip it if you cut in heavy or rocky conditions, or if you need a blade that works for bagging or discharge—you’ll be better off with a thicker, multipurpose OEM or aftermarket alternative.