US Mower Flail Mower Blade Bolts are machined for thread length and clearance and drilled appropriately for locking pin. These are not “off the shelf” bolts as the shoulder length is critical to not have blades riding on shoulder. Used on all US Mower Flail Mowers that accept the 1″ Diameter Bolt. Nuts & roll pins sold separately.

USM PN 2558544