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(16 Pieces) 5/16'-18x3/4' Square Head Bolts Grade A307 Hot Dip Galvanized

4.7 (1) Write Review
Free shipping on orders over $29.99

$15.54

$ 5 .99 $5.99

In Stock

About this item

  • 16 Pieces Total
  • Diameter/Pitch: 5/16"-18 | Grade: A307
  • Length Under Head: 3/4" | Finish: Hot Dip Galvanized
  • Coarse / Fine Threads: Coarse | Partial / Full Threads: Full
  • Wrench Size: 1/2"


BoltsandNuts.com is a family owned full-line fastener distributor located in Perry, Ohio. We stock over 16,000 sku’s and operate out of a 30,000sqft facility. Our company was founded in 2013 with the boom of internet e-commerce. We can supply items like Hex Bolts, Flange Bolts, Socket Products, Screws, Nuts, Washers, Assortments, and much more. We have proven to be a reputable supplier to many different industries, and can supply anything from a single piece to full truck loads of fasteners. Our operations and dedicated team have over 100+ years of combined existing fastener experience. We look forward to serving you!


Jac A Richmond
Reviewed in the United States on March 14, 2025
The galvanized coating caused the size to be too big for 5/16 18 nuts. Had to chase threads on every bolt to use with 5/16 18 nuts. Made in china. Beware.