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Prime-Line 9091140 Serrated Flange Bolts, 3/8 in.-16 X 3/4 in., Zinc Plated Case Hardened Steel (25 Pack)

4.9 (1) Write Review
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$23.84

$ 12 .06 $12.06

In Stock

About this item

  • Size: 3/8 inch-16 X 3/4 inch
  • Hex bolt with a serrated circular flange under the head
  • Flange eliminates need for separate washer
  • Serrations bite into surface and can help to prevent loosening
  • Designed for use with a nut (not included) or a threaded hole of the same diameter and thread size


Flange bolts feature a built in washer under the bolt head that helps to distribute the clamping load over a larger area. This "one-piece" design eliminates the need of a separate washer under the bolt head and is preferable for some applications as it can be more efficient and easier to use. A washer is still needed on the nut side unless using a flange nut. The serrations under the flange bite into the surface and help to resist loosening due to vibration.


Darrell R.
Reviewed in the United States on March 16, 2023
Ordered these bolts, was supposed to be a 25 pack. I received 4 bolts. On top of that, they weren’t in any kind of packaging. Just 4 bolts inside of bubble wrap. Stay far far away!