5/8-11 Grade C Zinc Nylon Insert Locknut

Description

5/8-11 Grade C Zinc Nylon Insert Locknut is a medium-duty fastener with a zinc-plated finish, offering greater proof load and tensile strength than standard Grade 2 Zinc alternatives, suited for moderate-duty fastening applications where additional strength and vibration resistance are required.

Nylon insert locknuts have a six-sided nut body with a nylon collar permanently embedded in the top of the nut, designed to grip the threads of a mating bolt or rod and resist loosening from vibration without damaging the fastener. Their six-sided body allows for easy tightening with standard wrenches and sockets, and the medium-carbon steel construction provides reliable performance in moderate-duty assemblies where standard Grade 2 fasteners fall short.

Grade C Zinc

• Grade C Zinc nylon insert locknuts offer a higher proof load and tensile strength than standard Grade 2 Zinc alternatives, making them suitable for moderate-duty applications requiring greater strength than light-duty fasteners provide
• The zinc plating provides light corrosion resistance suitable for dry or indoor environments

5/8-11 Grade C Zinc Nylon Insert Locknut Features

• Nylon insert collar permanently embedded in the top of the nut creates an interference fit with mating bolt threads, resisting loosening from vibration and dynamic stress without damaging the fastener surface
• Reusable locking action remains effective through multiple assembly and disassembly cycles, though locking effectiveness decreases with repeated use
• Greater strength than Grade 2 from the medium-carbon steel construction, suitable for moderate loads and assemblies where light-duty fasteners are insufficient

Common Uses

• Moderate-duty machinery, equipment, and structural assemblies requiring greater strength than Grade 2 fasteners provide
• General construction and manufacturing applications in dry, indoor environments where an upgrade from light-duty fasteners is needed
• Vibration-prone assemblies subject to moderate loads where both locking capability and additional strength are required

Application

• Thread onto a compatible bolt or threaded rod by hand until the nut body contacts the mating surface, then tighten with a wrench or socket sized to the hex body
• Additional torque will be required as the bolt threads engage the nylon insert — this resistance confirms the locking action is engaged
• Use with a washer between the nut and mating surface to distribute load and prevent surface damage where required

Tips

• Always verify that the bolt or threaded rod shares the same thread diameter and pitch as the nylon insert locknut before assembly
• Nylon insert locknuts are measured by their thread diameter and pitch, matching the bolt or threaded rod they are paired with
• Grade C Zinc nylon insert locknuts are not recommended for exterior, high-moisture, or corrosive environments, or for high-temperature applications where sustained heat may degrade the nylon insert — use SS 18-8 for corrosive environments and Grade 8 Yellow Zinc for higher strength requirements