We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Stainless steel self-locking thread insert, plain finish, coarse right-hand threads

E-Z Lok

E-Z Lok 303-10-PK5 Heavy Wall Self Locking Thread Insert hardware

SKU CH-KK5M-K2Y3H

Self-locking stainless steel thread insert repairs 5/8"-11 threads in metal using a 7/8"-9 external thread

  • TypeThreaded Inserts
  • Self-locking threads resist vibration loosening in metal
  • Stainless steel 18-8 construction withstands corrosion
  • Coarse right-hand threads simplify installation
  • Pack of five inserts supports multiple repairs
  • Heavy-wall design adds strength in 7/8 inch holes

E-Z Lok 303-10-PK5 Thread Insert Pack

This E-Z Lok 303-10-PK5 kit supplies five heavy-wall self-locking thread inserts made from 18-8 stainless steel. They create a 5/8"-11 coarse internal thread inside a 7/8"-9 external thread for metal components. The plain finish suits general-purpose repair and reinforcement tasks. Installers drill a 49/64 inch hole to accept the insert.

Suits damaged-thread repair in metal

Mechanics and fabricators who need to restore stripped or worn 5/8"-11 threads in metal housings will find these inserts match the required dimensions. The self-locking design resists vibration loosening once installed. Buyers who want more inserts per package or a different internal thread size should look at other kits. The 7/8"-9 external thread limits use to holes tapped for that specific size.

7/8"-9 external thread with 5/8"-11 internal thread

The defining specification is the thread pair: a 7/8"-9 coarse external thread and a 5/8"-11 coarse internal thread, both right-hand. This combination decides whether the insert fits the existing tapped hole and accepts the intended fastener. Verify the host material can be drilled to 49/64 inch and tapped to 7/8"-9 before ordering. The minimum installation depth is 13/16 inch.

Highlights

  • Self-locking threads resist vibration loosening in metal
  • Stainless steel 18-8 construction withstands corrosion
  • Coarse right-hand threads simplify installation
  • Pack of five inserts supports multiple repairs
  • Heavy-wall design adds strength in 7/8 inch holes

Specifications

BrandE-Z LOK
TypeThreaded Inserts

Questions about this item

How do I confirm the insert is seated correctly after installation?

Verify the insert sits flush or slightly below the parent material surface, with the internal 5/8"-11 threads clean and the self-locking feature resisting rotation when a bolt is threaded in.

What comes in the package and what must I supply myself?

The pack contains 5 stainless-steel inserts; you must provide a 49/64 in drill bit, a 7/8"-9 tap, and an installation tool matched to the insert design.

Which thread size should I select for a 5/8"-11 bolt?

Choose the insert listed with internal thread size 5/8"-11 and external thread 7/8"-9, as this matches the bolt and the prepared hole.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.