Colony #8105-16 Cylinder Base Nuts & Lock Washers – Harley Big Twin 1930–1978

The Colony #8105-16 cylinder base nuts and lock washers set is a correct replacement solution for securing cylinders on classic Harley-Davidson Big Twin engines. CAD plated for durability and corrosion resistance, this set is made in the USA and built to the standards Colony is known for.

Ideal for restorations, engine rebuilds, or routine service work, these base nuts and lock washers provide a proper, period-correct fit on Big Twin motors spanning nearly five decades. Whether you’re keeping an original build together or freshening up an old motor, this set delivers dependable hold where it matters most.

Fitment

Harley-Davidson Big Twin models

1930–1978

Colony part number 8105-16