Flange bolts feature a built-in washer under the bolt head that helps to distribute the clamping load over a larger area. This 1-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.
Size: 3/8 in.-16 x 3/4 in.
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
Thread type， coarse， thread class， UNC-2A， point style， blunt
Specification(s) met， ASME B18.2.1， ASME B18.6.3 and ASME B1.1
Comment