Flange bolts feature a built in washer under the bolt head that helps to distribute the clamping load over a larger area.
Constructed of solid steel, milled and threaded to work with threaded nut fastenersThese bolts come finished in a corrosion resistant, zinc plated finishDesigned for use with a variety of projects, to fasten multiple parts togetherFeatures standard hex nut shape and can be used in conjunction with jam nuts, lock washers, specialist adhesive thread-locking fluid, etc.8 Metric M6-1.0 X 50MM Zinc Plated Steel 10PK 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.