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Core Borer


Core borers drill openings in stoppers that fit various laboratory glassware, such as test tubes and flasks.


Our curated selection includes simple, inexpensive core borer sets with various sizes drills and benchtop models that are indispensable for laboratory technicians who need to customize stoppers for experimental setups.


Can't find the core borer you need? Let us help!


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Order Core Borer from SECO

Core borers are fundamental tools in laboratory settings, enabling precise customization of corks and rubber stoppers for various applications. By choosing the right type of core borer and maintaining it properly, laboratory technicians can enhance their efficiency and accuracy.


Our handpicked selection of lab core borers is designed to meet the demanding needs of modern laboratories.


Can't find the core borer you need? Reach out to us! At SECO, we're more than just suppliers; we're your partner in sourcing scientific equipment.


We pride ourselves in providing affordable, high-quality laboratory essentials, backed by fast logistics from our Pennsylvania warehouse. This ensures rapid 1 or 2-day delivery to most of the Eastern USA.


Let us equip your lab with the best scientific equipment and supplies. Because quality results begin with quality tools.


What is a Core Borer?

A core borer, commonly referred to as a cork borer in laboratory settings, is an essential tool used to bore precise holes in corks and rubber stoppers.


Key Core Borer Applications for Laboratories


Chemical Lab
Creating custom apertures in stoppers for inserting tubing, thermometers, or other apparatus.

Biological Lab
Preparing stoppers for use in fermentation or culture experiments where airtight seals are necessary.

Educational Settings
Teaching students about laboratory techniques and equipment handling.


How Does a Core Borer Work?

Core borers typically consist of hollow cylindrical tubes with sharp, precision-ground cutting edges. They are used manually or with the aid of a machine to cut through cork or rubber stoppers.


Operating Steps:

  1. Preparation: Secure the cork or rubber stopper and select the appropriate borer size.
  2. Boring: Position the borer on the stopper and apply steady pressure to cut through the material. For machines, adjust the guide to ensure the hole is bored at the correct location.
  3. Extraction: Remove the borer and extract the newly formed cork piece. Use a punch if necessary to clear the borer tube.
  4. Final Touches: Clean and inspect the hole to ensure it meets the required specifications.

Safety Precautions:

  • Personal Protective Equipment (PPE): Always wear safety goggles to protect your eyes from debris.
  • Stable Setup: Ensure the stopper is securely held to prevent slipping during the boring process.
  • Sharp Tools: Keep borers sharp for efficient cutting and reduce the risk of slipping.

Types of Core Borers and Related Tools

Cork Borer Sets with Handles

These affordable sets are designed for boring holes in corks and rubber stoppers. They consist of plated tubing with precision-ground cutting edges and smooth plastic handles, each stamped with a number designation. A punch is included with each set.

Key Features:

Order Core Borer Set

Cork Boring Machine

Designed to mount on any tabletop, this machine features an adjustable guide for precise boring in any part of a stopper. The knurled chuck accommodates the 9/16" (14mm) shank of the included eight plated-steel borers.

Key Features:

Order Cork Boring Machine

Cork Borer Sharpener

This tool sharpens borers ranging from 3/16" to 15/16" (5mm to 24mm). It features a solid brass cone with a hinged steel blade mounted in a hardwood handle.

Key Features:

Order Cork Borer Sharpener

Humbolt Core Boring Machine Replacement Parts - H-9655

A set of eight plated steel borers, the same as those included with the H-9650 Cork Boring Machine.


Order Stainless Steel Replacement Parts

Cork Press

A rotary compression device used for softening and tapering corks ranging in sizes from 0 to 22. Made from cast aluminum, it can be wall or bench mounted.

Key Features:

  • Softens and tapers corks for easier boring.
  • Robust aluminum construction for durability.

Multi-Blade Cork Borer Sharpener

Features hollow ground cutting blades arranged in a conical pattern for fast, effective sharpening of cork borers. Made from hardened tool steel.

Key Features:

  • Quick and efficient sharpening.
  • Long-lasting hardened steel blades.

Brass Core Borer Set

A complete set of fifteen brass borers ranging from 4.5 mm to 22.5 mm in diameter. Includes a permanent strong handle and a steel center punch.

Key Features:

  • Durable brass construction.
  • Wide range of sizes for various applications.

Steel Core Borer Set

Similar to the brass series but made of nickel-plated steel. This set includes ten borers ranging from 3.5 mm to 15.8 mm in diameter.

Key Features:

  • Nickel-plated steel for sharper edges.
  • Comprehensive set for diverse needs.

Brass Cork Borer Sharpener

A solid brass cone with a steel blade and hardwood handle, designed to sharpen borers up to 25 mm in diameter.

Key Features:

  • Solid brass for durability.
  • Efficient sharpening with a steel blade.
Your Core Borer Specialist

At SECO, we are committed to providing the best products and customer service. Our team of product consultants is always ready to assist you in choosing the right core borer for your laboratory needs.


Contact us for more information or to place an order.


Explore our range of core borers and accessories to find the perfect tools for your lab needs. For expert advice and support, feel free to contact our team.