Self-sealing fixing element

摘要

A self-sealing fixing element is provided. The fixing element (20 in Figure 2) comprises a body 21, 22 with a bearing surface 23, and a bore with an opening in the bearing surface. A curable sealant layer 40 is carried by the bearing surface 23 and encircles the opening in the bearing surface. The curable sealant layer 40 is formed from a sealant material which cures when exposed to atmosphere. A barrier layer 41 overlays the curable sealant layer 40 and can break apart when the fixing element is installed in order to expose the sealant layer 40 to atmosphere. The curable sealant layer 40 has a thickness which decreases away from the bore, and the barrier layer 41 has a thickness which increases away from the bore. Alternatively the fixing element may include a fitting comprising a washer (245 in Figure 9) which contacts the bearing surface 23 and encircles the opening in the bearing surface.