Colony Head Bolts

23 products — part of all Head Bolts

Head bolts are among the most stress-critical fasteners on any Harley-Davidson engine, holding the cylinder head under the sustained heat and mechanical load of a running V-twin. Colony has supplied period-correct hardware for the Harley-Davidson community since the marque's mid-century golden era, and their head bolt range reflects that heritage with fitments covering Knucklehead engines from 1936 to 1947 and Big Twin powerplants across the long run from 1936 to 1984. Whether you are rebuilding a Knucklehead for concours presentation or returning a classic Big Twin to the road, Colony provides the correct thread spec, head geometry and finish to meet original Harley-Davidson tolerances. Substituting the wrong fastener on a head build risks both leak paths and structural integrity — Colony removes that risk with hardware built to do the job right. At Iron City Motorcycles in Leeds, our team can source the exact Colony head bolt for your restoration. Browse the full Colony Head Bolts range below.