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E-Z LOK™ Threaded Insert for Metal - Extra Heavy Wall - 303 Stainless Steel - 5/16-18 x 9/16-12

SKU: 3353-5
Exact part/packaging not shown. Actual parts and packaging may vary.
5 - 499$2.200
500 - 999$2.090
1000 - 2499$1.980
2500 - 4999$1.870
5000 - 9999$1.760
10000 - 24999$1.650
25000 +$1.540


E-Z LOK™ Threaded Insert for Metal - Extra Heavy Wall - 303 Stainless Steel - 5/16-18 x 9/16-12

E-Z LOK™ (Solid Wall) threaded inserts with Extra Heavy Wall are ideal for reducing the size of tapped holes, typically after previous drilling/re-tapping operations. Like all E-Z LOK™ (Solid Wall) threaded inserts, the Extra Heavy Wall design is installed using standard drills and taps. Installation is performed with a screwdriver, bolt/jam nut, or optional E-Z LOK™ drive tool.

E-Z LOK™ (Solid Wall) Extra Heavy Wall inserts are self-locking. Immediately upon installation, pre-applied LOCTITE™ on the external threads begins to set and the newly installed insert is fastener ready in minutes. At full cure (72 hours), the Loctite™ seals against liquids and gases to pressures of 6,000 psi.


  • Strong: screw machined out of solid steel for greater strength
  • Easy to Install: simply drill, tap, and thread in like an ordinary fastener
  • Standard OD Threads: permit the use of standard drills and taps
  • Self-locking – preapplied LOCTITE™ adhesive activates on installation
  • Vibration Resistant: adhesive secures the insert in place so it won’t back out
  • Seals against Liquids/Gases: to pressures of 6,000 psi.


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


Unlike E-Z Coilâ„¢ inserts, which require a special tap and installation tool, E-Z LOKâ„¢ (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 LOKâ„¢ (Solid Wall) insert like an ordinary fastener with a screwdriver, bolt and jam nut, or an E-Z LOKâ„¢ drive tool.

E-Z LOKâ„¢ (Solid Wall) threaded inserts are self-locking and open immediately upon installation. The pre-applied LOCTITEâ„¢ 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

Knowledge Base



E-Z Lok P/N: 3353-5
For Use in: Metal
Specific Material Use: N/A
Sub-Category: Extra Heavy Wall
Style: Solid Wall
Material: Steel - Stainless
System of Measurement: Inch
Internal Thread: 5/16-18
External Thread: 9/16-12
Installed Length: 0.52
Drill Size: 31/64
Tap Size: 9/16-12
Minimum Full Thread Depth: 0.594
Installation Tool P/N: 500-4

Prop 65

Prop 65


WARNING: This product can expose you to chromium, 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.