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Scag Cutter Blade Drive Spindles*

Scag cutter deck spindleCutter blade drive spindles are a crucial component to mower performance. The average blade spindle rotates over 1.8 MILLION times in eight hours of cutting . That's 9 million times per week! Can you afford to have anything but the BEST blade drive spindles turning your cutter blades? Absolutely not!

Scag cast-iron spindle housings* are cast in Ripon Wisconsin and precision machined at Scag by Mazak Super Turn machining centers to ensure a perfect fit for the tapered roller bearings. Every Scag cast-iron spindle is assembled, greased and torqued by hand at the Scag factory. This is the best performing, most reliable spindle in the commercial industry...hands down. We have been using this same rock-solid design for many years and proudly stand behind them with a 3-year limited warranty.
  • Cast-iron housing versus aluminum housing: Cast-iron is stronger and dissipates heat better.
  • Tapered roller bearings versus ball bearings: Tapered roller bearings can handle combination of radial and thrust loads, ball bearings can not.
  • Greaseable versus "maintenance-free": At over 1.8 million revolutions per day, greaseable spindles are a must for heavy-duty commercial applications.

Scag cutter deck spindleTake a look at some of the Scag spindle* features.


Bearings - Scag spindles utilize a matched set of tapered roller bearings. Tapered roller bearings have 50% more load capacity than ball bearings. The taper angles allow the bearing to handle a combination of radial and thrust loads, unlike a ball bearing.

Housing - Cast iron spindle housing. Increased shock load strength over aluminum housings. Super strong to take the everyday abuses of mowing. In 2004, Scag spindle housings were upgraded to an even thicker mounting flange, increasing strength by 163%!

Hardened spindle shaft 1-1/8" diameter. Extra large diameter, hardened spindle shaft provides superior strength. Key groove is cut into shaft for solid pulley mounting.

Grease fitting. Top-mounted for quick and easy greasing. No need to crawl under the cutter deck.

Grease relief valve . Special relief poppet valve ensures that "over-greasing" and damaging a seal is impossible, even with powered grease guns. The valve is spring loaded to prevent debris from entering the housing, unlike "weep holes".

Blade bolt mounting hole. Cutter blade retaining bolt travels through the center of the shaft. Under extreme impact, only the bolt may need to be replaced, not the entire spindle assembly. The thru-bolt design also allows you to change blades without altering the proper preload (150 ft. lbs.) on the tapered roller bearings.