Plow Bolt — Heavy Equipment & Cutting Edge
Plow bolts have a flat or slightly domed countersunk head with a square section under the head that prevents rotation. They are used in earthmoving equipment — bulldozer cutting edges, grader blades, bucket lips — where the bolt head must sit flush with the wear surface.
Specifications
| Head Type | No. 3 (countersunk square neck) — most common; No. 7 also available |
|---|---|
| Grade | Grade 8 / Grade 5 / Grade 2 |
| Diameter Range | 1/2" – 1-1/4" |
| Material | Medium-carbon alloy steel, heat-treated |
| Surface Finish | Plain, Yellow zinc |
| Supplied With | Matching heavy hex nuts, often locknuts |
Frequently Asked Questions
How does a plow bolt resist loosening from impact and vibration?
The square or fin section under the countersunk head bites into the wear plate, preventing rotation. Combined with a serrated-flange or all-metal locknut on the back side, this provides good resistance to the severe vibration of earthmoving service.
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