Machine thread type is used in a pre-tapped hole with or without a nut. The Truss Head has a low rounded top surface with a flat bearing surface greater in area than a Round Head fastener of the same nominal size. Weaker than a Pan or Round Fastener, but preferred in applications where minimal clearance exists above the head. The profile provides a trim, finished assembly appearance. Zinc plating, retards the corrosion rate in a normal atmosphere.
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