McKinney RBT4A3786 4-1/2 x 4-1/2 Five-Knuckle Heavy Weight Raised Barrel Butt Hinge — Full Mortise

The McKinney RBT4A3786 is a full mortise, five-knuckle heavy weight steel butt hinge measuring 4-1/2 in. x 4-1/2 in. Its defining feature is a raised barrel — the barrel sits higher than a standard butt hinge barrel, allowing a high-frequency door to clear projecting casing trim or a deep frame return without binding. Fabricated from heavy-gauge steel at 0.180 in. leaf thickness, this hinge is engineered for demanding, high-cycle commercial and institutional door applications where a standard-weight hinge would be inadequate. Also referred to as a raised barrel butt hinge or elevated barrel hinge, the RBT4A3786 installs flush into mortised cutouts on both the door edge and frame in the conventional full-mortise configuration — the most common and structurally preferred method for commercial door hardware.

Institutional-Grade Features & Benefits

• Raised Barrel Clearance: The elevated barrel profile allows the door face to clear projecting door casing, thick applied trim, or deep frame returns that would otherwise interfere with door swing — a common requirement in renovation and historic retrofits as well as new construction with pronounced molding profiles.
• Heavy Weight Steel Construction: At 0.180 in. leaf thickness, this hinge exceeds standard-weight specifications, delivering the structural rigidity and long-term cycle life demanded by high-traffic commercial openings.
• Five-Knuckle Design: The five-knuckle barrel distributes load more evenly across the hinge pin than three-knuckle designs, reducing wear, minimizing play, and extending service life on doors that see frequent use.
• Full Mortise Installation: Both leaves recess fully into the door edge and frame, producing a flush, clean appearance and maximizing the bearing surface between the hinge and the door/frame substrate — the preferred configuration for commercial and institutional openings.
• McKinney Genuine OEM Quality: Manufactured by McKinney, a long-established commercial hinge brand, the RBT4A3786 is a direct, authentic replacement or new-installation hinge consistent with McKinney full-line catalog specifications.

Technical Details