Flange Bolts
Flange bolts are identifiable by the ridge or skirt surrounding the bolt head. This skirt
acts as a means of distributing the clamping load of the bolt across the fastening
surface. A flange bolt is designed to provide the same holding power as a washer.
When it comes to choosing the right type of flange bolt for your particular project,
there are a few issues to be aware of.

Flange Bolts: Material Strength Issues
When it comes to flange bolts, or bolts of any kind, you have to remember that the
plating of the bolt will play a large role in determining the maximum temperature it can
withstand. This not only applies to conditions where extreme heat is present, but
extreme cold as well. Engine conditions and extreme weather are areas where bolt
plating has to be taken into account. Don't run into problems by choosing the wrong
types of bolts.

In colder conditions, carbon and alloy steel become brittle at temperatures below
65°F. Hydrogen embrittlement can also be a problem. The bolt won't have any visible
defects, but will be weakened due to temperature stress. A cadmium plated bolt is the
best. The military uses cadmium plating in its fasteners and they can be somewhat
costly. Zinc chromate is a less expensive alternative. Anodized aluminum and
stainless steel will also resist corrosion, but only if you know you are buying from a
reputable dealer.

That's where the peace of mind found from buying your fasteners at
NutsandBolts.com comes in. We have been in the fastener business for over 20
years, so you know you are buying from an experienced, reputable company. We will
be happy to answer any questions you may have, no matter the project you're
working on, and make recommendations based on your needs and price range.
NutsandBolts.com is the best at what we do.