Left Hand Thread Bolt Reverse Thread Bolt Left Hand Thread Screws

Left hand thread bolt is the bolt with a reverse thread which different the right-hand thread bolt in normal. Most threads on bolts have right-hand thread meaning that turning the bolt clockwise inserts or tightens the bolt; counterclockwise loosens or removes the bolt. But in the left-hand thread, the reverse is true. Turning the bolt clockwise loosens or removes the bolt. The left-hand thread is used in applications where the normal turning motion of the object is such that there is a possibility that the object could back out and be removed. For instance, the left pedal of a bicycle turns around the crankarm in a counterclockwise direction. If it had a right-hand thread, the pedal could fall off. Thus all left pedals have a left-hand thread so that the motion of the pedal helps to keep the pedal tight on the crankarm. Ever Hardware provides custom-made fasteners and customizable packaging.

Zinc coatings prevent oxidation of the left-hand thread bolt by forming a barrier and by acting as a sacrificial anode if this barrier is damaged. Zinc oxide is a fine white dust that (in contrast to iron oxide) does not cause a breakdown of the substrate’s surface integrity as it is formed. Indeed, the zinc oxide, if undisturbed, can act as a barrier to further oxidation, in a way similar to the protection afforded to aluminum and stainless steels by their oxide layers. The majority of hardware parts are zinc-plated, rather than cadmium-plated.