The A●LOK BOLT SLOT INSERT is a slotted insert designed to be cast into the conical or slab top section of underground concrete structures for the purpose of anchoring the cast iron frame to the structure. The insert assembly consists of a tough polypropylene shell and a .75 inch square galvanized nut.

The key purpose of the insert is to allow for center to center adjustment of the .75 inch galvanized nut to match the bolt center of the manhole frame. Traditional anchoring inserts require precise positioning on center to assure proper alignment of assembly. With the availability of the Bolt SLot Insert in overall lengths of 3 inches and 6 inches, any manhole frame can be accommodated regardless of bolt centers.

The inserts are shipped assembled for standard installation into the precast top section.

Inserts are held in position during the casting operation by a Four-Way Installation Holder in the four quadrants on a predetermined center to allow maximum adjustment in matching the bolt center of the manhole frame.

ADVANTAGES

• Guaranteed alignment of galvanized nut and bolt centers of manhole frame.
• The .75 inch square nut is galvanized to prevent corrosion.
• In traffic areas misalignment of frame and structure top is eliminated due to shifting or movement during construction, or during routine maintenance.