E-z Lok 303-008 Thread Locking Insert 8-32 Unc Stainless

Product Description

The E-Z LOK 303-008 is a self-locking threaded insert machined from 303-grade stainless steel, designed to create a secure internal thread in a tapped hole while resisting loosening under vibration and dynamic loads. The insert features an 8-32 internal thread (2B class of fit) and a 5/16-18 external thread (2A class of fit) conforming to UNC standards. Overall length is 0.290 inches (19/64 inches). Tensile strength is rated at 2,732 pounds. The bright finish indicates no additional coating has been applied. Machinists, maintenance technicians, and assembly professionals install this insert wherever a permanent, vibration-resistant thread repair or reinforcement is required in metal substrates.

This insert is suited for use in metal components requiring a smaller internal thread anchored by a coarser external thread. The self-lock wall design engages the parent material to prevent rotation and back-out without relying on adhesives or separate locking elements. Typical applications include light-duty machinery, enclosures, brackets, and precision assemblies where an 8-32 fastener must seat securely. The 303 stainless steel construction makes it appropriate for environments with mild corrosion exposure or where non-magnetic properties are preferred.

Key Features

• 8-32 internal thread (UNC, Class 2B fit) for standard machine screw engagement
• 5/16-18 external thread (UNC, Class 2A fit) for installation into a standard tapped host hole
• Self-lock wall design resists rotation and back-out without adhesives
• 2,732-pound tensile strength rating
• 303-grade stainless steel construction with bright finish
• 0.290-inch overall length suits shallow boss and thin-wall applications

Compatibility

Designed as an OEM-style threaded insert for metal substrates tapped to accept a 5/16-18 UNC external thread, converting to an 8-32 UNC internal thread. Compatible with standard 5/16-18 taps per the manufacturer specification.

Installation Notes

Installation is performed using a standard 5/16-18 UNC tap in the host material before driving the insert. Secure the workpiece and ensure the tapped hole is clean and free of chips or debris before installation. Use the appropriate E-Z LOK installation tool or a threaded mandrel to drive the insert to the correct seated depth without damaging the internal thread. Follow applicable fastener and assembly standards for torque and inspection procedures.