Grade 5 Shear Bolts for Rotary Cutters 1/2 in x 3-1/2 in - 12 Pack

Our review of these Grade 5 shear bolts finds them best suited to contractors, farmers, and owners of mid-size rotary cutters who need a dependable, ready-to-install repair kit. The single biggest reason to buy is the combination of mill certified Grade 5 hardened steel and matching nyloc nuts, which together deliver consistent shear protection while resisting loosening under vibration. The 12-pack format makes it practical for routine maintenance and on-the-spot repairs without having to source individual fasteners.

Key Features

• Grade 5 hardened steel: Mill certified SAE J429 material provides predictable shear behavior to protect driveline components.
• Complete 12-pack: Twelve bolts and twelve nyloc nuts are included so a full blade coupling can be replaced in one go.
• Nyloc nut locking: Nylon insert nuts help prevent loosening from constant vibration during mowing and field work.
• Universal size: 1/2 in diameter and 3-1/2 in length are compatible with most rotary cutters such as Bush Hog and King Cutter.
• Corrosion resistant finish: Zinc Cr+3 RoHS compliant coating reduces surface rust and extends service life in outdoor conditions.

Who It's For

This kit is aimed at owners and technicians who service medium rotary cutters and need a dependable, like-for-like replacement for factory shear bolts. It is especially useful for 5 ft and similar models where customers have reported the bolts fit perfectly and perform reliably.

Those who should look elsewhere are users needing custom shear strengths outside of Grade 5 performance or cutters with nonstandard fastener sizes; this kit only covers the universal 1/2 in x 3-1/2 in configuration and standard shear characteristics.

Pros & Cons

Pros

• Mill certified Grade 5 material gives known, reliable shear protection during overloads.
• Included nyloc nuts reduce the chance of vibration-induced loosening in field use.
• Good value for money with a full set of 12 bolts and nuts ready for service.

Cons

• Only one shear rating and size are offered, so it is not suitable for cutters requiring different bolt dimensions or non-Grade 5 shear characteristics.

Specifications

Our Verdict

These Grade 5 shear bolts are a practical, cost-effective choice for routine maintenance of common rotary cutters. The combination of hardened steel, nyloc locking nuts, and a corrosion-resistant finish makes the kit a sensible spare-parts purchase for farmers and equipment shops who want reliable fit and function without overpaying.

Frequently Asked Questions

Are these bolts compatible with my rotary cutter?
They fit most cutters that use 1/2 in diameter x 3-1/2 in shear bolts, including common Bush Hog and King Cutter models.

Do the nuts prevent vibration loosening?
Yes, the included nyloc nuts have a nylon insert designed to resist loosening from vibration.

What level of corrosion protection is provided?
The bolts have a zinc Cr+3 RoHS compliant finish to reduce surface corrosion in outdoor use.