4 Inch Core Drill Bit: Concrete Open-Head

4 Inch Core Drill Bit: Concrete Open-Head

4in (101.6mm) Concrete Core Drill Bit (Open-Head) is a diamond core drill for professional use and is SDS compatible for heavy duty masonry and concrete drilling. Used with Gasoline or Electric-Powered Core Drills to get cores of hardened concrete, asphalt or aggregate for laboratory testing or evaluation. Coring Bit attaches to the drilling machine with a properly sized Expander Set. This product is very durable and engineered to withstand repeated use in tough materials, aggregate and steel-reinforced concrete. Diamond Bits perform well in high output, heavy use applications and can be refurbished when worn.

Designed to last and even after extensive use about half of the life may remain, so the bit can take many more holes. Diamond Coring Bits are for wet use with reinforced concrete and similar hard materials, using water with wet core bits helps cool the bit and remove slurry, improves cutting and extends bit life. Fast cutting when used for indicated applications. Standard 14in (356mm) length allows for cores up to 12in (305mm) deep and 4 inch diameter is a standard size for many applications. This type is also good for drilling through plywood backed walls and user reviews speak to the reliability and quality of work of this product.

Expander Sets for Open-Head Concrete Coring Drill Bits are required to connect Open-Head Concrete Coring Bits to the drilling machine and are sold separately in sizes corresponding to the bit. Final core diameter is about 0.25in (6.4mm) littler than nominal outside diameter.

When purchasing please note that this product is usually in stock for fast shipping but please check current stock before buying. Some diamond core drill bits can be expensive but this product is a lot of value for the price so it’s a good choice for both professionals and DIY.

When using always hold the drill steady, push with consistent pressure and pay attention to the feel of the bit during drilling, be safe and avoid binding or kickback.

Features:

• Fast cutting for concrete and asphalt materials

• Very durable* Maximum depth of cut: 14in (varies by model)

• Tough cutting segments for longer bit life

• SDS compatible

• Wet core type, use with water for better cutting

• Attaches to drill machine with size specific Expander Set

• Meets ASTM and AASHTO standards

Accessories:

4in Expander Sets for Open-Head Concrete Coring Drill Bits to attach bit to drilling machine

Specifications

• Application: Concrete

• Nominal Bit Size, OD: 4in (101.6mm)

• Maximum Drilling Depth: 12in (304.8mm)

• 4in-Open-Head

• Segments: 8 diamond segments

• Mounting Connection: Open-Head

• Weight: 5.5lb (2.49kg)

Meets Standard(s):

• AASHTO T 24M/T 24

• ASTM C42/42M

• For cement fineness testing related to ASTM C430/AASHTO T 192, see the NIST 46H Portland Cement Fineness Standard, SRM (10/Pk).

• For calibration and verification, see the NIST 114R Portland Cement Fineness Standard.

The 4in Concrete Core Drill Bit (Open-Head) is for getting cores of hardened concrete or asphalt for laboratory testing or evaluation. Use with Gasoline or Electric-Powered Core Drills for fast cutting of concrete and asphalt materials. For larger diameter cores, consider the 6in Concrete Core Drill Bit (Open-Head).

To use this bit simply attach it to your drilling machine with the size specific Expander Set (sold separately). Diamond bits in this core drill bit perform well in high output, heavy use applications and can be refurbished when worn. Designed for wet use with reinforced concrete and similar hard materials.

Standard 14in length allows for cores up to 12in deep and 4 inch diameter is a standard size for many applications. Bit has 8 tough diamond segments for efficient cutting and long life. Meets ASTM and AASHTO standards for reliability and accuracy in testing and evaluation.

Includes 4in Concrete Core Drill Bit (Open-Head) but Expander Set is not included and must be purchased separately. Expander sets are required to connect open-head concrete coring bits to the drilling machine.This bit has a 4in nominal bit size, 4in-Open-Head model, 12in maximum depth and 8 segments. Open-head mounting and 5.5lb estimated shipping weight. Meets AASHTO T 24M/T 24 and ASTM C42/42M standards.

For more information and related topics check out our blog posts. We have articles on choosing the best concrete corer for your project, best asphalt core drill bit, strength testing of concrete cores, core drilling with certified material testing products, core drilling for soil sampling and the ultimate guide to coring test for asphalt and concrete cores. These resources will help you with your concrete core drilling projects.

Buy the 4in Concrete Core Drill Bit (Open-Head) today and take your concrete and asphalt testing to the next level. For different sizing needs, consider the 3in Concrete Core Drill Bit (Open-Head) as well.

Applications and Uses

Diamond core bits are versatile tools for many drilling applications, for professionals and DIY. Whether you’re doing plumbing, HVAC or electrical installations, core drill bits are designed to cut precise holes in concrete, brick, stone, asphalt and masonry.

For wet and dry drilling, core bits can handle any size job—from small home renovations to big construction sites. Robust construction allows them to cut through reinforced concrete and hard materials with ease, making them a reliable choice for drilling holes where durability and efficiency is key.

Size matters: larger diameter core bits for deep holes, smaller for shallower applications. This flexibility means you can always find the right bit for your job, whether you need to create a small opening for wiring or a bigger hole for pipework.

Engineered for goodness, these diamond core bits produce smooth, clean holes with minimal breakout even in thick or tough materials. Used correctly—with the right drill speed and steady pressure—they cut through concrete and masonry like butter, extending bit life and reducing overall project cost.

Use these core drill bits with rotary drills, not hammer drills to avoid damage and maximize durability. Apply the right pressure and speed, to the material and bit diameter for optimal performance and longer bit life.Available in various diameters and lengths, core drill bits can be bought individually or in bulk, making them a economical solution for any job size. Durable and engineered, they’re a smart investment for anyone who works with concrete, masonry or asphalt regularly.

Choose the right core bit and use it right and you’ll get professional results—smooth, accurate holes in the toughest materials—while enjoying the efficiency, cost savings and long life of diamond core bits. Whether you’re coring a concrete wall, drilling into brick or working with stone or asphalt, these core drill bits are the choice for reliable, high quality results.