Description
When you’re working on your tractor or implement and need a bolt that’ll stay tight, UNF threads are what you want. This 3/8-inch hex bolt with fine threads gives you stronger holding power than coarse threads, especially important when dealing with vibration and the constant movement that comes with farm work. The zinc and yellow plating helps it resist rust so it’ll look good and function properly season after season.
Key Features
- Fine UNF threads provide superior holding power compared to standard coarse threads
- Zinc and yellow plating offers excellent corrosion resistance for outdoor use
- 1-1/2 inch length works well for medium-duty connections and repairs
- Standard hex head fits common wrenches and sockets you already have
Built for Real Farm Work
This bolt size is perfect for general-purpose repairs and maintenance on tractors, implements, and shop-built equipment. You’ll find 3/8-inch bolts used throughout agricultural equipment for everything from brackets and guards to smaller frame connections. The fine thread pattern makes it ideal for applications where you need a secure connection that won’t work loose under vibration.
Made to Last
The zinc and yellow plating isn’t just for looks—it provides a protective barrier against moisture and chemicals that can cause ordinary bolts to rust and seize. This coating helps ensure the bolt will come apart years later when you need to service or repair your equipment.
Good to Know
UNF stands for Unified National Fine, which means tighter thread spacing than standard coarse threads. This gives you more threads engaging in the nut or threaded hole, creating a stronger connection. Keep a few of these handy in your toolbox—they’re one of those fasteners you’ll reach for more often than you’d expect.
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