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

E-Z LOK Self Locking Thread Insert: Heavy Wall, 5/16"-24 Int Thrd Sz, 1/2"-13 Ext Thrd Sz - Heavy Wall Self-Locking Inserts
E-Z LOKHeavy Wall Self-Locking Inserts

E-Z LOK Self Locking Thread Insert: Heavy Wall, 5/16"-24 Int Thrd Sz, 1/2"-13 Ext Thrd Sz

The E-Z LOK Self Locking Thread Insert is a heavy-wall, inch-system insert with a 5/16"-24 UNF internal thread and a 1/2"-13 UNC external thread, supplied in a 5-pack (SKU 303-524-PK5, MPN 303-524-PK5). It features a…

SKU 3G-OTH-534152

Also listed as: 303524PK5 · 303 524 PK5

Brand
E-Z LOK
Item
Self Locking Thread Insert: Heavy Wall, 5/16"-24 Int Thrd Sz, 1/2"-13 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
303-524-PK5
Type
5 PK
Wall Type
Heavy Wall
Ext Thrd Sz
1/2"-13
Int Thrd Sz
5/16"-24
Thread Type
UNF Internal/UNC External
Compatible Tap Size
1/2"-13
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 is a heavy-wall, inch-system insert with a 5/16"-24 UNF internal thread and a 1/2"-13 UNC external thread, supplied in a 5-pack (SKU 303-524-PK5, MPN 303-524-PK5). It features a 2A external thread fit and a 2B internal thread fit, and is compatible with a 1/2"-13 tap. 3G Electric sources this genuine OEM part across 14 industrial departments, with specialist expertise in combustion, pumps and controls to ensure you get the right solution.

Frequently Asked Questions

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

E-Z LOK Self Locking Thread Inserts repair or reinforce stripped or worn threads in metal assemblies. The heavy-wall design provides extra strength for demanding applications across machining, power transmission, and industrial equipment. 3G Electric supplies this genuine OEM part for maintenance and repair needs worldwide.

What are the specifications of E-Z LOK 303-524-PK5?

This heavy-wall insert has a 5/16"-24 UNF internal thread and a 1/2"-13 UNC external thread, with 2B internal and 2A external thread fits. It is compatible with a 1/2"-13 tap, uses inch measurement, and comes in a 5-pack (MPN 303-524-PK5).

Where to buy E-Z LOK thread inserts in worldwide?

3G Electric supplies E-Z LOK thread inserts to customers worldwide. As a global industrial solutions provider, we handle full logistics and customs clearance to deliver genuine OEM parts like the 303-524-PK5 to your facility. Contact us for availability and delivery to your location.

How to install E-Z LOK heavy wall thread inserts?

Installation requires tapping the hole to the specified external thread size (1/2"-13), then driving the insert into the tapped hole using a standard installation tool. The self-locking feature secures the insert without adhesives. Always follow the manufacturer's instructions for proper torque and depth.

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, 5/16"-24 Int Thrd Sz, 1/2"-13 Ext Thrd Sz, 10 PK (MPN 329-524-PK10)
E-Z LOK
E-Z LOK Self Locking Thread Insert: Heavy Wall, 5/16"-24 Int Thrd Sz, 1/2"-13 Ext Thrd Sz, 10 PK (MPN 329-524-PK10)
E-Z LOK Self Locking Thread Insert: Heavy Wall, M8-1.25 Int Thrd Sz, 1/2"-13 Ext Thrd Sz, 5 PK (MPN 653-8-PK5)
E-Z LOK
E-Z LOK Self Locking Thread Insert: Heavy Wall, M8-1.25 Int Thrd Sz, 1/2"-13 Ext Thrd Sz, 5 PK (MPN 653-8-PK5)
E-Z LOK Self Locking Thread Insert: Heavy Wall, 5/16"-18 Int Thrd Sz, 1/2"-13 Ext Thrd Sz, 5 PK (MPN 303-5-PK5)
E-Z LOK
E-Z LOK Self Locking Thread Insert: Heavy Wall, 5/16"-18 Int Thrd Sz, 1/2"-13 Ext Thrd Sz, 5 PK (MPN 303-5-PK5)
E-Z LOK Self Locking Thread Insert: Heavy Wall, 7/16"-20 Int Thrd Sz, 5/8"-11 Ext Thrd Sz, 5 PK (MPN 329-720-PK5)
E-Z LOK
E-Z LOK Self Locking Thread Insert: Heavy Wall, 7/16"-20 Int Thrd Sz, 5/8"-11 Ext Thrd Sz, 5 PK (MPN 329-720-PK5)
E-Z LOK Self Locking Thread Insert: Heavy Wall, M12-1.75 Int Thrd Sz, 3/4"-10 Ext Thrd Sz, 5 PK (MPN 653-12-PK5)
E-Z LOK
E-Z LOK Self Locking Thread Insert: Heavy Wall, M12-1.75 Int Thrd Sz, 3/4"-10 Ext Thrd Sz, 5 PK (MPN 653-12-PK5)
E-Z LOK Self Locking Thread Insert: Heavy Wall, 1/2"-13 Int Thrd Sz, 3/4"-10 Ext Thrd Sz, 5 PK (MPN 329-801-PK5)
E-Z LOK
E-Z LOK Self Locking Thread Insert: Heavy Wall, 1/2"-13 Int Thrd Sz, 3/4"-10 Ext Thrd Sz, 5 PK (MPN 329-801-PK5)
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)