UNC 1-1/4" Core Drill Bit Adapter – 1/2" Hex Shank, 40Cr Steel

UNC 1-1/4" to 1/2" Hex Shank Core Drill Bit Adapter

Upgrade your drilling setup with this heavy-duty UNC 1-1/4" Thread Core Drill Bit Adapter. Built from high-grade 40Cr chrome vanadium steel and finished in a durable matte black coating, this adapter bridges the gap between your 1/2" hex shank power drill and 1-1/4" UNC threaded core drill bits — delivering a secure, wobble-free connection every time.

Made in Mainland China.

Key Features

• Wide Compatibility: Converts 1-1/4" UNC male threads to 1/2" hex shank, making it compatible with a broad range of coring drill bits for concrete, masonry, and more.
• 40Cr Chrome Vanadium Steel Construction: Engineered for long-lasting durability and consistent, stable performance through demanding drilling applications.
• Secure, Confident Connection: The precision-threaded interface locks your core bit firmly in place, giving you full control throughout the drilling process.
• Optimized for Rotary Mode: Designed specifically for rotating drilling mode — keep your tools and workpieces in top condition by avoiding hammering mode with this adapter.
• Easy to Use: Simple connect-and-go design — attach the hex shank end to your power drill and thread the bit onto the UNC end in seconds.
• Black Finish: Corrosion-resistant black coating extends the life of the adapter and gives it a professional look.

Specifications

Package Contents

• 1 × Core Drill Bit Adapter

How to Use

1. Verify that the shank and thread sizes match your power drill and core drill bit before use.
2. Insert the 1/2" hex shank end into your power drill or hammer drill chuck.
3. Thread your 1-1/4" UNC core drill bit onto the adapter's male thread end securely.
4. Use in rotary mode only — do not use hammering/impact mode with this adapter.

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Frequently Asked Questions

Q: What drill bit types is this UNC 1-1/4" core drill adapter compatible with?

A: This adapter is designed to work with core drill bits that have a 1-1/4" UNC thread, such as Adamas-style coring drill bits used for concrete, brick, and masonry applications. Always verify your bit's thread specification matches 1-1/4" UNC before purchasing.

Q: Can I use this adapter with an impact or hammer drill in hammering mode?

A: No. This core drill bit adapter is optimized for rotary (rotating) mode only. Using it in hammering or impact mode may damage the adapter, your drill bit, or your workpiece. Always switch your drill to rotation-only mode before use.

Q: What material is this drill adapter made of, and how durable is it?

A: The adapter is constructed from 40Cr chrome vanadium steel, a high-strength alloy known for its toughness and resistance to wear. The black oxide finish adds an extra layer of corrosion protection, making this adapter built to withstand heavy, repeated use on job sites and in workshops.

Q: What is included in the package?

A: Each order includes 1 × UNC 1-1/4" to 1/2" Hex Shank Core Drill Bit Adapter. No additional accessories are included.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.