Dorman 250017 Hex Lock Nut with Nylon Insert Grade UNC - 2 3/4-10

The Dorman 250-017 is a Grade 2 hex lock nut featuring an integrated nylon insert (nylon ring), designed to resist loosening caused by vibration, torque, and thermal cycling. With a 3/4-10 UNC thread size, this prevailing torque nut is a dependable fastener solution for general-purpose mechanical and automotive applications.

The nylon insert creates interference with the mating bolt threads, generating friction that prevents the nut from backing off under dynamic loads — no additional locking hardware required. The hex body allows for standard wrench installation and removal.

Key Features:

• Thread Size: 3/4-10 UNC (Unified National Coarse)
• Grade: Grade 2 — suitable for general-purpose, non-structural applications
• Locking Mechanism: Nylon insert (nylon ring) for vibration-resistant prevailing torque
• Drive Type: Hex (6-point) for standard wrench or socket use
• Finish: Zinc-plated steel for corrosion resistance
• Type: Prevailing torque lock nut (non-re-usable by design after full engagement)
• Manufacturer Part Number: 250-017

Dorman's line of hardware and fasteners is engineered to meet or exceed OEM specifications, making these nylon insert lock nuts a reliable choice for maintenance, repair, and fabrication projects across automotive, powersports, and general mechanical use.