134149 Mower Blade for 42" Deck, 21'' Mulching Blades Compatible with Craftsman Model 917 Lawn Tractor, Hu sqvarna Riding Mower, Replace for 424752 24676 422719 139775, 2 Pack

What It Is

This is a 2-pack of 21-inch mulching blades designed for 42-inch cutting decks on Craftsman 917-series lawn tractors and compatible Husqvarna riding mowers. They replace OEM parts 424752, 24676, 422719, and 139775, and are intended for mulching grass clippings into fine particles to return nutrients to the lawn.

Fitment & Compatibility

Before buying, confirm your deck is exactly 42 inches wide and uses 21-inch blades. Measure your current blade length from tip to tip—this is critical. Check your mower’s model number (e.g., Craftsman 917.xxxxx) and cross-reference with the OEM numbers listed (424752, 24676, 422719, 139775). These blades are aftermarket, not genuine OEM, so verify the center hole diameter and offset match your spindle. Also ensure your mower uses a standard 5-point star center hole. If you have a different brand (e.g., John Deere, MTD), these likely won’t fit.

Key Things to Know

• Quality: Users report these blades are durable and sharpen well, but some note they are slightly thinner than OEM blades—fine for standard residential use, not heavy commercial jobs.
• Installation: Easy to install with basic hand tools (socket wrench, torque wrench recommended). Tighten blade bolts to manufacturer spec (typically 70–90 ft-lbs) to avoid loosening.
• Gotcha: These are mulching blades only—they will not bag or discharge well. If you switch between mulching and bagging, you’ll need a separate set.
• Balance: Check blade balance after sharpening; some users found they needed light filing to avoid vibration.

Should You Buy It

Buy these if you own a Craftsman 917 or compatible Husqvarna riding mower with a 42-inch deck, want affordable mulching blades for regular lawn upkeep, and don’t need OEM branding. They’re a solid value for the price, but skip them if you need bagging or side-discharge performance, or if you demand heavy-duty commercial-grade steel.