We ship worldwide — Singapore, Australia, Malaysia, Indonesia, Philippines, India, Middle East & more

E-Z LOK Self Locking Thread Insert: Heavy Wall, 3/4"-10 Int Thrd Sz, 1"-8 Ext Thrd Sz - Heavy Wall Self-Locking Inserts
E-Z LOKHeavy Wall Self-Locking Inserts

E-Z LOK Self Locking Thread Insert: Heavy Wall, 3/4"-10 Int Thrd Sz, 1"-8 Ext Thrd Sz

The E-Z LOK Self Locking Thread Insert: Heavy Wall (MPN 303-12-PK5) is a plain, 5-pack of inch-system coarse-thread inserts with a 3/4"-10 internal thread size and a 1"-8 external thread size. It features a 2B…

SKU 3G-OTH-534163

Also listed as: 30312PK5 · 303 12 PK5

Brand
E-Z LOK
Item
Self Locking Thread Insert: Heavy Wall, 3/4"-10 Int Thrd Sz, 1"-8 Ext Thrd Sz
Category
Heavy Wall Self-Locking Inserts
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support

Delivery
Worldwide DHL shipping from Singapore; 7–14 business days door-to-door for most destinations.
Payment
Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.

Technical Specifications

E-Z LOK
Manufacturer Part Number
303-12-PK5
Type
Plain, 5 PK
Wall Type
Heavy Wall
Ext Thrd Sz
1"-8
Int Thrd Sz
3/4"-10
Thread Type
Coarse
Compatible Tap Size
#1-8
External Thread Fit
2A
Internal Thread Fit
2B
System of Measurement
Inch

Technical Documents

No technical documents available for this product.
Request documentation
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

E-Z LOK Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The E-Z LOK Self Locking Thread Insert: Heavy Wall (MPN 303-12-PK5) is a plain, 5-pack of inch-system coarse-thread inserts with a 3/4"-10 internal thread size and a 1"-8 external thread size. It features a 2B internal thread fit, a 2A external thread fit, and is compatible with a #1-8 tap. This heavy-wall insert is designed for reliable thread repair or reinforcement in industrial applications.

Frequently Asked Questions

What is the E-Z LOK Self Locking Thread Insert used for?

The E-Z LOK Self Locking Thread Insert is used for thread repair or reinforcement in heavy-duty industrial applications. Its heavy-wall design provides extra strength for stressed threads in metal components, making it suitable for machining, power transmission, and material handling equipment where reliable thread integrity is critical.

What are the specifications of the E-Z LOK 303-12-PK5 thread insert?

The E-Z LOK 303-12-PK5 is a heavy-wall, plain thread insert in a 5-pack. It has a 3/4"-10 internal thread size and a 1"-8 external thread size, both coarse inch threads. Internal thread fit is 2B, external is 2A, and it is compatible with a #1-8 tap.

Where to buy E-Z LOK thread inserts worldwide?

3G Electric supplies E-Z LOK thread inserts worldwide, handling full logistics and customs clearance for global delivery. As a sourcing partner across 14 industrial departments, we provide genuine E-Z LOK parts like the 303-12-PK5 heavy-wall insert to customers in machining, electrical, and other sectors.

How to install an E-Z LOK heavy-wall thread insert?

To install an E-Z LOK heavy-wall thread insert, drill out the damaged thread to the recommended tap size (#1-8 for this insert), tap the hole, then use a standard installation tool to drive the insert until it is slightly below the surface. The self-locking feature secures it without adhesives.

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.

You might also need

Burners & Combustion Pumps & Compressors Spare Parts All Products

More from E-Z LOK

View all E-Z LOK parts
E-Z LOK Self Locking Thread Insert: Heavy Wall, 3/8"-16 Int Thrd Sz, 9/16"-12 Ext Thrd Sz, 10 PK (MPN 329-6-PK10)
E-Z LOK
E-Z LOK Self Locking Thread Insert: Heavy Wall, 3/8"-16 Int Thrd Sz, 9/16"-12 Ext Thrd Sz, 10 PK (MPN 329-6-PK10)
E-Z LOK Self Locking Thread Insert: Heavy Wall, 3/8"-16 Int Thrd Sz, 9/16"-12 Ext Thrd Sz, 5 PK (MPN 303-6-PK5)
E-Z LOK
E-Z LOK Self Locking Thread Insert: Heavy Wall, 3/8"-16 Int Thrd Sz, 9/16"-12 Ext Thrd Sz, 5 PK (MPN 303-6-PK5)
E-Z LOK Self Locking Thread Insert: Heavy Wall, 5/16"-18 Int Thrd Sz, 1/2"-13 Ext Thrd Sz, 10 PK (MPN 329-5-PK10)
E-Z LOK
E-Z LOK Self Locking Thread Insert: Heavy Wall, 5/16"-18 Int Thrd Sz, 1/2"-13 Ext Thrd Sz, 10 PK (MPN 329-5-PK10)
E-Z LOK Self Locking Thread Insert: Heavy Wall, #10-24 Int Thrd Sz, 3/8"-16 Ext Thrd Sz, 10 PK (MPN 329-3-PK10)
E-Z LOK
E-Z LOK Self Locking Thread Insert: Heavy Wall, #10-24 Int Thrd Sz, 3/8"-16 Ext Thrd Sz, 10 PK (MPN 329-3-PK10)
E-Z LOK Self Locking Thread Insert: Heavy Wall, M16-2.00 Int Thrd Sz, M24-3.00 Ext Thrd Sz, 5 PK (MPN 450-16-PK5)
E-Z LOK
E-Z LOK Self Locking Thread Insert: Heavy Wall, M16-2.00 Int Thrd Sz, M24-3.00 Ext Thrd Sz, 5 PK (MPN 450-16-PK5)
E-Z LOK Self Locking Thread Insert: Heavy Wall, M12-1.75 Int Thrd Sz, M16-2.00 Ext Thrd Sz, 5 PK (MPN 450-12-PK5)
E-Z LOK
E-Z LOK Self Locking Thread Insert: Heavy Wall, M12-1.75 Int Thrd Sz, M16-2.00 Ext Thrd Sz, 5 PK (MPN 450-12-PK5)
E-Z LOK Self Locking Thread Insert: Heavy Wall, M5-0.80 Int Thrd Sz, M8-1.25 Ext Thrd Sz, 10 PK (MPN 450-5-PK10)
E-Z LOK
E-Z LOK Self Locking Thread Insert: Heavy Wall, M5-0.80 Int Thrd Sz, M8-1.25 Ext Thrd Sz, 10 PK (MPN 450-5-PK10)
E-Z LOK Self Locking Thread Insert: Heavy Wall, M6-1.00 Int Thrd Sz, M10-1.50 Ext Thrd Sz, 5 PK (MPN 453-6-PK5)
E-Z LOK
E-Z LOK Self Locking Thread Insert: Heavy Wall, M6-1.00 Int Thrd Sz, M10-1.50 Ext Thrd Sz, 5 PK (MPN 453-6-PK5)