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: 1/4 in.-20 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












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