Flange bolts are machine threaded for use with a nut. They have a flange under the head that acts like a built in flat washer. This bolt is identifiable by the ridge or surrounding the bolt head, this built-in washer under the head of the Bolt acts to distribute the clamping load over a greater area. These bolts are sometimes called Frame bolts. A hexagonal head for use with a wrench.

Material Steel, Stainless Steel, Brass
Thread Metric
Type Flange
Grade A1 & A2 Stainless Steel, A2 & A4 Steel, CDA 360 Brass, C360 Brass.
Flange Bolt Diameter Head/Wrench Size*
Hex Flange Bolt (IFI-111) and Hex Flange Lag
1/4" 3/8"
5/16" 1/2"
3/8" 9/16"
7/16" 5/8"
1/2" 3/4"
9/16" 13/16"
5/8" 15/16"
3/4" 1-1/8"
* This is the width across the flats.

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