8Pcs 5/8 Cutting Edge Bolts, Grader Blade Bolt 5/8" UNC-11 x 2-1/4", Bucket Cutting Edge Bolts, Grader Blade Bolt for Snow Plow, Tractor Attachment, Construction Machinery

What It Is

These are heavy-duty 5/8" UNC-11 x 2-1/4" cutting edge bolts, designed to secure grader blades, bucket edges, snow plow blades, and similar wear parts on construction machinery, tractor attachments, and mower decks that use a 5/8" bolt pattern.

Fitment & Compatibility

• Thread size: 5/8" UNC (coarse) – 11 threads per inch. Confirm your equipment uses this thread, not metric or fine thread.
• Length: 2-1/4" (from under the head to tip). Measure your existing bolt length and the thickness of the blade/deck to ensure the bolt doesn’t bottom out or protrude too far.
• Head shape: Typically a countersunk or flat head. Check that the head profile matches your blade or cutting edge recess.
• Use case: Common on grader blades, backhoe buckets, snow plow edges, and some zero-turn mower decks with 5/8" bolt holes. Not for standard push mowers or most residential riding mowers.
• OEM vs aftermarket: These are aftermarket bolts. Verify your equipment’s bolt pattern (hole diameter and spacing) is 5/8", and that the bolt grade (likely Grade 5 or 8) matches your application’s load requirements.

Key Things to Know

• Grade matters: For heavy use (snow plows, grading), Grade 8 bolts are stronger. These are likely Grade 5 – fine for lighter mower decks but check for high-stress applications.
• Installation: Use a torque wrench. Overtightening can strip threads or snap bolts; undertightening causes blade wobble. Typical torque for 5/8" Grade 5 is ~150-200 ft-lbs.
• Locking: Use thread locker (blue Loctite) or lock washers if your equipment doesn’t have a self-locking feature, as vibration can loosen bolts.
• Countersink check: If your blade/deck uses a countersunk hole, ensure the bolt head angle (usually 90° or 82°) matches. A mismatch can cause poor seating and premature wear.

Should You Buy It

Buy these if you need a replacement set of 5/8" UNC-11 x 2-1/4" cutting edge bolts for a grader blade, snow plow, or heavy-duty mower deck, and you’re comfortable verifying thread pitch and head type. At $11.99 for 8 bolts, they’re a good value for light to medium-duty use, but for extreme loads (e.g., commercial grading), step up to Grade 8 bolts.