Description
When you’re fixing brackets, guards, or panels on your tractor or implements and need a bolt that won’t spin while you tighten the nut, a carriage bolt is what you’re looking for. The square shoulder under the head locks into the hole, so you can tighten from one side without fighting a spinning bolt. This 5/16-inch by 3-inch size is perfect for medium-duty connections where you need to bolt through thicker material or multiple layers.
What You’re Getting
- Grade 5 steel construction that’s 25% stronger than hardware store bolts
- Zinc plating resists rust and corrosion from moisture and road salt
- Square shoulder locks into wood or soft material to prevent spinning
- 3-inch length handles thicker brackets and multi-layer connections
- Standard UNC threading works with any 5/16-18 nut
Built for Real Farm Work
This bolt size works great for mounting brackets on loaders, securing guards and shields, or assembling shop-built equipment where you need a clean, tamper-resistant connection. The carriage bolt design is especially handy when you’re working with wood brackets or softer materials that the square shoulder can bite into.
Made to Last
Grade 5 bolts give you the right balance of strength and cost for most farm applications. The zinc coating helps them stand up to the moisture and road salt that comes with farm work, so they won’t rust out in a season or two like plain steel bolts.
Good to Know
The square shoulder works best when it can bite into the material—it won’t prevent spinning in a round hole in steel plate. Use a flat washer under the nut to spread the load and get proper clamping force. If you’re replacing rusty bolts, clean out the hole first so the square shoulder seats properly.
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