E-Z LOK Self Locking Thread Insert: Heavy Wall, 1/4"-20 Int Thrd Sz, 7/16"-14 Ext Thrd Sz
The E-Z LOK Self Locking Thread Insert is a heavy-wall, inch-system insert with a 1/4"-20 internal thread size and a 7/16"-14 external thread size, compatible with a 7/16"-14 tap. It features coarse threads, external…
SKU 3G-OTH-534105
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Product Description
The E-Z LOK Self Locking Thread Insert is a heavy-wall, inch-system insert with a 1/4"-20 internal thread size and a 7/16"-14 external thread size, compatible with a 7/16"-14 tap. It features coarse threads, external thread fit 2A, internal thread fit 2B, and is supplied in a 5-pack (MPN 303-4-PK5).
Frequently Asked Questions
What is the E-Z LOK 303-4-PK5 thread insert used for?
The E-Z LOK 303-4-PK5 is a heavy-wall self-locking thread insert used to repair or reinforce tapped holes in metal, plastic, or wood. It provides a durable 1/4"-20 internal thread with a 7/16"-14 external thread, ideal for industrial applications requiring vibration resistance and load distribution.
What are the specifications of the E-Z LOK 303-4-PK5 thread insert?
The E-Z LOK 303-4-PK5 is a 5-pack of heavy-wall inch-system inserts. Internal thread size is 1/4"-20 with 2B fit; external thread size is 7/16"-14 with 2A fit. Compatible tap size is 7/16"-14. Thread type is coarse. Manufacturer part number is 303-4-PK5.
Where to buy E-Z LOK 303-4-PK5 thread inserts worldwide?
3G Electric supplies E-Z LOK 303-4-PK5 thread inserts worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your facility. Contact us for pricing and lead time on this 5-pack of heavy-wall self-locking inserts.
How to install an E-Z LOK heavy-wall thread insert?
To install the E-Z LOK 303-4-PK5, drill a hole to the recommended size, tap it with a 7/16"-14 tap, then thread the insert into the tapped hole using a standard installation tool. The self-locking feature secures the insert without adhesives. Follow generic best practices for thread insert installation.
E-Z LOK Products
3G Electric supplies E-Z LOK heavy wall self-locking inserts. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.









