E-z Lok 303-7 Thread Locking Insert 7/16-14 Stainless

Product Description

The E-Z LOK 303-7 is a self-locking threaded insert machined from grade 303 stainless steel. It accepts a 7/16-14 UNC internal thread and installs into a 5/8-11 UNC tapped hole, with an overall length of 0.656 inches (21/32 inches). The self-lock wall design resists loosening under vibration and dynamic loads without adhesives or locking compounds. With a rated tensile strength of 17,216 pounds, this insert is built for demanding fastening applications where thread integrity and corrosion resistance are critical. Licensed machinists, millwrights, and maintenance technicians typically install this type of hardware in metal assemblies requiring a reinforced or converted thread form.

The 303-7 insert is suited for use in light to heavy industrial assemblies, machinery repair, and OEM manufacturing where a permanent, self-locking thread is needed. The 5/8-11 external thread requires a standard tap, keeping installation tooling straightforward. Its bright finish and stainless steel construction make it a practical choice in corrosive or washdown environments. This insert is sold individually with a minimum order quantity of 5 pieces.

Key Features

• Self-lock wall design resists thread loosening under vibration without added locking compounds
• Grade 303 stainless steel construction for corrosion resistance
• 7/16-14 UNC internal thread, Class 2B fit
• 5/8-11 UNC external thread, Class 2A fit, installed with a standard tap
• Rated tensile strength of 17,216 pounds
• Bright finish; overall length of 0.656 inches

Compatibility

Designed for use in any application requiring a 5/8-11 UNC tapped host hole and a 7/16-14 UNC internal thread form, following standard UNC thread specifications.

Installation Notes

Installation requires a properly tapped 5/8-11 UNC hole in the host material using a standard tap. Ensure the host material is secured and free of chips before driving the insert. Consult applicable torque and thread engagement guidelines from your engineering or maintenance standards. Use appropriate personal protective equipment when machining or driving inserts into hardened or heavy-gauge stock.