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E-Z LOK™ Threaded Insert for Metal - Screw Locking - Carbon Steel - 1/4-20 x 7/16-14

SKU: 329-4IC


E-Z LOK™ Threaded Insert for Metal - Screw Locking - Carbon Steel - 1/4-20 x 7/16-14

E-Z LOK™ (Solid Wall) Screw Locking Inserts are the standard heavy wall solid threaded inserts with thread locking adhesive on both the external and internal threads of the insert. The adhesive on the external threads secures the insert in place. The internal thread adhesive provides a screw locking feature that keeps fasteners from backing out.

Install these threaded inserts with a screwdriver or optional drive tool, allowing 3-5 minutes for the external thread adhesive to set up prior to threading in the fastener. A bolt can be used for installation as long as you do not intend to remove it. Removing the bolt after installation destroys adhesive effectiveness.


  • Strong: screw machined out of solid steel for greater strength; superior pull out resistance.
  • Loctite adhesive preapplied to the internal threads provides a screw locking feature that makes these inserts ideal for high vibration appliations.
  • Easy to install: solid threaded inserts install with standard tools; simply drill, tap and thread like any ordinary fastener
  • Self-Locking: pre-applied adhesive on the external threads activates upon installation; inserts won't back out
  • Standard size and pitch external threads eliminate need for special taps or installation tools.
  • Install using a screwdriver, bolt and jam nut, or optional E-Z LOK™ drive tool


  • Soft metals: aluminum, cast iron, magnesium, etc.


Unlike E-Z Coil™ inserts, which require a special tap and installation tool, E-Z LOK™ (Solid Wall) threaded inserts for metal are installed using standard tools, and installation is as easy as 1-2-3.

  • Simply drill the appropriately sized hole with a standard drill
  • Tap the hole with a standard tap
  • Turn in the E-Z LOK™ (Solid Wall) insert like an ordinary fastener with a screwdriver, bolt and jam nut, or an E-Z LOK™ drive tool.

E-Z LOK™ (Solid Wall) threaded inserts are self-locking and open immediately upon installation. The pre-applied LOCTITE™ on the external threads sets immediately allowing for the newly installed insert to be fastener ready.

E-Z LOK solid wall threaded inserts are typically installed with the slots up. The slots accommodate a screwdriver or E-Z LOK drive tool. When using a bolt and jam nuts for installation, the slotted end of the insert can be either up or down.

Important Note: Hole size requirements may vary depending on a number of factors, including material and tools. We recommend you test your particular application before ordering. Contact us for free samples.

View Installation Instructions



E-Z Lok P/N: 329-4IC
For Use in: Metal
Specific Material Use: N/A
Sub-Category: Screw Locking
Style: Solid Wall
Material: Steel - Carbon
System of Measurement: Inch
Internal Thread: 1/4-20
External Thread: 7/16-14
Installed Length: 0.44
Drill Size: U
Tap Size: 7/16-14
Minimum Full Thread Depth: 0.5
Installation Tool P/N: 500-3

CAD Drawings

CAD Drawings

Knowledge Base

Prop 65

Prop 65


WARNING: This product can expose you to lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.