2pack - Grade 2 Shear Bolts for Rotary Cutters 1/2" x 3-1/2" with Nylock Nuts

What It Is

These are Grade 2 shear bolts (1/2" x 3-1/2") with Nylock nuts, designed to break under excessive load to protect the gearbox and driveline on rotary cutters (brush hogs, finish mowers, and similar PTO-driven equipment). They’re a direct replacement for OEM shear bolts on many medium-duty cutters.

Fitment & Compatibility

Before buying, verify three things:

• Bolt size: Must be 1/2" diameter and 3-1/2" long (thread length varies—measure your old bolt’s unthreaded shank).
• Grade: Grade 2 is low-strength; only use if your manufacturer specifies Grade 2. Many rotary cutters require Grade 5 or 8 (check your manual or existing bolt head markings).
• Machine fit: Common on Bush Hog, Land Pride, Woods, and similar brands, but always match to your model’s OEM part number. Not universal—some decks use 5/8" or shorter bolts.

Key Things to Know

• Grade matters: Grade 2 bolts shear at roughly 3,900 lbs tensile; using a higher grade (e.g., Grade 5) can damage your gearbox if the bolt doesn’t break first.
• Nylock nuts: These lock nuts are reusable a few times, but replace them if the nylon insert is worn or if the nut spins freely.
• Installation: Hand-tighten plus 1/4 turn max—overtightening can pre-stress the bolt, causing premature shearing. Use a torque wrench if specified (often 20-30 ft-lbs).
• Common gotcha: The 2-pack may not match your cutter’s required quantity (some use 1 bolt, others 2). Buy extra if you shear often.

Should You Buy It

Only buy if your rotary cutter explicitly calls for Grade 2 shear bolts and you’ve confirmed the 1/2" x 3-1/2" size matches your OEM part. With a 2.0 rating and low reviews, quality may be inconsistent—consider a known brand like Bush Hog or Woods if you need reliability. Best for light-duty or occasional use where you want cheap, breakable protection.