Description
When you need a bolt that won’t vibrate loose under field conditions, a UNF (Unified Fine) thread is your friend. This 3/8-inch hex bolt with fine threads grips tighter than standard coarse threads and stays put when your equipment’s bouncing across rough ground or running at high RPMs. The 4-1/2-inch length and zinc & yellow plating make it a reliable choice for through-bolting thick components.
What You’re Getting
- Fine UNF threads provide stronger holding power and better vibration resistance than coarse threads
- Zinc & yellow plating fights corrosion and gives you that professional OEM look
- 3/8-inch diameter hits the sweet spot for medium-duty connections without being overkill
- 4-1/2-inch length works great for thick brackets, multiple plates, or spacered assemblies
Built for Real Farm Work
This size bolt shows up in all kinds of agricultural applications where you need secure connections that won’t shake loose. You’ll find it holding together implement frames, securing hydraulic components, mounting brackets on three-point hitches, and in shop-built repairs where standard hardware store bolts just don’t cut it.
Made to Last
The zinc & yellow plating system provides superior corrosion resistance compared to plain zinc, especially in outdoor farm environments. That fine thread pattern means more thread engagement and better clamping force, so your connections stay tight season after season.
Good to Know
Fine threads take a bit more care when starting—cross-thread one of these and you’ll know it. Use a thread chaser or die to clean up rusty threads before assembly. The fine pitch means you’ll turn the wrench more times to tighten, but you’ll get a much more secure connection when you’re done.
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