Hi-Lo® Plus fasteners, with alternating high and lo threads introduce a sharper 30º included angle on both high and low threads. In addition, the Hi-Lo® Plus incorporates a 45º angle step on the trailing flank of the threads. These sharp threads displace minimal material to reduce stress and cracking and further increase drive/strip ratios. Heads on these fasteners are to ASTM/ANSI standard dimensions.
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