3/4-10 Grade 8 Yellow Zinc Nylon Insert Locknut

Description

3/4-10 Grade 8 Yellow Zinc Nylon Insert Locknut is a high-strength fastener with a yellow zinc-plated finish, offering superior tensile strength over Grade 2 and Grade C alternatives and light corrosion protection, often used in heavy-duty and high-stress fastening applications where vibration resistance is also 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 high-strength alloy steel construction provides reliable performance in demanding mechanical and structural applications.

Grade 8 Yellow Zinc

• Grade 8 Yellow Zinc nylon insert locknuts offer significantly higher tensile and proof strength than Grade 2 or Grade C alternatives, making them suitable for heavy-duty and high-stress applications
• The yellow zinc plating provides light corrosion resistance and serves as a visual identifier for Grade 8 fasteners in the field

3/4-10 Grade 8 Yellow 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
• Superior tensile strength from the high-strength alloy steel construction, suitable for heavy loads, high-stress connections, and demanding mechanical assemblies

Common Uses

• Heavy machinery, automotive, and equipment assemblies requiring both high-strength fastening and reliable vibration resistance
• Structural connections and industrial applications subject to high loads, vibration, or dynamic stress
• Any application where Grade 2 or Grade C fasteners are insufficient and maximum clamping strength with locking capability is required

Application

• Thread onto a compatible Grade 8 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 hardened washer between the nut and mating surface to distribute load and prevent surface damage under high clamping forces

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
• Always pair Grade 8 Yellow Zinc nylon insert locknuts with Grade 8 bolts — mismatched grades can result in fastener failure under load; do not use in high-temperature applications where sustained heat may degrade the nylon insert