A&I XHT 18", 5/8", HL Mower Blade (Set of 3) - B1BC1205,3 Shims and Inserts M78543 (RC12YC) Spark plugs (2)

M78543 (RC12YC) Spark plugs (2)

001X360 after serial number 150

Material(ALPHA): 10B38F

Hex Size (IN) 0

John Deere TRACTOR: 4240

A&I XHT 18", 5/8", HL Mower Blade (Set of 3) - B1BC1205,3 Shims and Inserts M78543 (RC12YC) Spark plugs (2)A&I XHT 18", 5 8", HL Mower Blade (Set of 3) B1BC1205,3 Replacement XHT Lawnmower blade. XHT(Xtreme Hardness & Toughness) blades are 25 40% harder than standard lawnmower blades. Benefits of the HXT blade are sharper and longer lasting cutting edges. More resistance to bending. Tighter tolerances in the aftermarket vs. OEM. XHT blades also offer greater impact toughness. (2) blades for 36" cut. (3) blades for 54" cut. Fits XM series. Center Hole 5 8"