134149 Lawn Mower Blades Mulching Blades for Craftsman Husqvarna 42 Inch Deck Riding Mower Replacement for 532134149 138971 532138971 YTH18542 2Pack

What It Is

This is a 2-pack of mulching blades (OEM equivalent part #134149) designed for 42-inch deck riding mowers, primarily Craftsman and Husqvarna models. Mulching blades cut grass clippings finer and recirculate them into the lawn for natural fertilization, ideal for regular mowing without bagging.

Fitment & Compatibility

Before buying, confirm your mower has a 42-inch cutting deck and uses a center hole diameter of 7/8-inch with a 3-point star drive pattern. These blades replace OEM part numbers 532134149, 138971, and 532138971. Compatible with models like Craftsman YTH18542, Husqvarna YTH18542, and many others on the 42-inch platform. Measure your existing blade length (should be 16.5 inches) and ensure the deck spindle pattern matches—Craftsman/Husqvarna 42-inch decks typically use a three-hole pattern, but some older decks may differ. Cross-reference your mower’s model number with the manufacturer’s blade chart to avoid fitment issues.

Key Things to Know

• Quality: Aftermarket but meets OEM specs—durable steel with proper heat treatment for long life. Comparable to OEM blades at a lower price.
• Installation: Moderate difficulty. Requires basic tools (socket wrench, torque wrench). Always disconnect the spark plug and lift the deck safely before swapping blades.
• Torque spec: Tighten blade bolts to 70-90 ft-lbs (check your manual). Over-tightening can strip threads; under-tightening risks blade detachment.
• Common gotcha: Mulching blades work best with a clean deck and sharp edges. Dull blades tear grass, not cut it. Replace every 25-30 hours or annually.
• Deck alignment: After installation, check blade rotation and deck leveling to ensure even cut and no scalping.

Should You Buy It

If you have a Craftsman or Husqvarna 42-inch deck riding mower and want to mulch clippings instead of bagging, this 2-pack offers good value. The price is competitive with OEM replacements, and the 4.7-star rating reflects reliable performance. Best for DIY homeowners who mow regularly and want a simple, cost-effective mulching setup. Avoid if you need standard lift blades for bagging or have a non-standard deck size.