

Employing high-quality alloy steel for the drilling body and YG carbide alloy for the drilling tip, in combination with various types of electric hammers. The drill is an efficient tool suitably and widely used for hole drilling in hard materials like concrete/brick in the construction & installation industries.
What is a Half Round Flute 4 Cutter Cross Head Hammer Drill Bit?
A Half Round Flute 4 Cutter Cross Head Hammer Drill Bit is a precision-engineered tool designed for efficient drilling in hard construction materials such as concrete, brick, and stone. This type of bit combines two advanced design features: the half round flute and a 4-cutter cross head tip.
The half round flute is designed to channel dust and debris out of the hole efficiently. Its curved, open profile allows for quick dust evacuation, reducing heat buildup and maintaining drilling speed, especially in deep or vertical applications.
At the cutting end, the 4-cutter cross head features four symmetrically positioned carbide blades. These cutting edges engage the material at multiple points, minimizing vibrations and helping to create clean, round holes. The cross-style design enhances both durability and impact distribution during hammer drilling, making the bit well-suited for use in rotary hammer drills in construction environments.
| Part No. | Size(mm) | Part No. | Size(mm) | Part No. | Size(mm) |
| AP09-001 | 6x110 | AP09-038 | 10×800 | AP09-075* | 15x160 |
| AP09-002 | 6x160 | AP09-039 | 10x100 | AP09-076* | 15x2.10 |
| AP09-003 | 6x210 | AP09-040* | 11x160 | AP09-077* | 15×260 |
| AP09-004 | 6x260 | AP09-041* | 11x210 | AP09-078* | 15x3.10 |
| AP09-005 | 6x350 | AP09-042* | 11x260 | AP09-079* | 15x3.50 |
| AP09-006 | 6.5x110 | AP09-043* | 11x310 | AP09-080 | 15x460 |
| AP09-007 | 6.5x160 | AP09-044* | 11x350 | AP09-08 | 16x160 |
| AP09-008 | 6.5x210 | AP09-045* | 11x460 | AP09-082 | 16x210 |
| AP09-009 | 6.5x260 | AP09-046* | 11x600 | AP09-083 | 16×260 |
| AP09-010* | 7x110 | AP09-047* | 12x110 | AP09-084 | 16x3.10 |
| AP09-011 | 7x160 | AP09-048 | 12x160 | AP09-085 | 16x350 |
| AP09-012* | 7x210 | AP09-049 | 12x210 | AP09-086* | 16x400 |
| AP09-013 | 7x260 | AP09-050 | 12×260 | AP09-087 | 16x460 |
| AP09-014 | 8x110 | AP09-051 | 12x310 | AP09-088 | 16×600 |
| AP09-015 | 8x160 | AP09-052 | 12x350 | AP09-089* | 16x800 |
| AP09-016 | 8x210 | AP09-053* | 12x400 | AP09-090 | 16×1000 |
| AP09-017 | 8x260 | AP09-054 | 12x460 | AP09-091* | 17×210 |
| AP09-018 | 8x310 | AP09-055 | 12x600 | AP09-092* | 17×260 |
| AP09-019 | 8x350 | AP09-056* | 12×800 | AP09-093* | 17x310 |
| AP09-020* | 8x400 | AP09-057 | 12x1000 | AP09-094* | 17x350 |
| AP09-021 | 8x460 | AP09-058* | 13x160 | AP09-095* | 17x460 |
| AP09-022* | 9x110 | AP09-059* | 13x210 | AP09-096 | 18x210 |
| AP09-023 | 9x160 | AP09-060 | 13x260 | AP09-097 | 18x260 |
| AP09-024 | 9x210 | AP09-061* | 13x310 | AP09-098 | 18x310 |
| AP09-025 | 9x260 | AP09-062* | 13x350 | AP09-099 | 18x350 |
| AP09-026 | 9x310 | AP09-063* | 13x460 | AP09-100* | 18x400 |
| AP09-027 | 9x350 | AP09-064* | 13x600 | AP09-101 | 18x460 |
| AP09-028 | 9x460 | AP09-065 | 14x160 | AP09-102 | 18x600 |
| AP09-029 | 10×110 | AP09-066 | 14x210 | AP09-103* | 18×800 |
| AP09-030 | 10×160 | AP09-067 | 14x260 | AP09-104 | 18×1000 |
| AP09-031 | 10x210 | AP09-068 | 14x310 | AP09-105* | 19x2.10 |
| AP09-032 | 10x260 | AP09-069 | 14x350 | AP09-106* | 19×260 |
| AP09-033 | 10x310 | AP09-070 | 14x400 | AP09-107* | 19x3.10 |
| AP09-034 | 10x350 | AP09-071 | 14x460 | AP09-108* | 19x350 |
| AP09-072 | 14x600 | ||||
| AP09-036 | 10x460 | AP09-073 | 14x800 | AP09-110 | 20×210 |
| AP09-037 | 10x600 | AP09-074 | 14x1000 | AP09-111 | 20×260 |
Why Choose a 4 Cutter Cross Head Design for Concrete Drilling?
When drilling into concrete or other tough materials, stability, accuracy, and tool longevity are essential. The 4-cutter cross head design offers clear advantages over traditional 2-blade or single-point bits.
This geometry allows the bit to strike the surface at four points simultaneously. As a result, impact energy is spread more evenly across the cutting surface, which reduces the chance of tip breakage and prevents the bit from drifting off-center when starting the hole. This is especially useful in reinforced concrete, where hitting embedded steel can often damage or deflect standard bits.
Additionally, the cross head provides more cutting contact with each hammer rotation, enabling faster penetration and smoother walls. This ensures a better fit for anchor systems and post-installed fasteners, where accurate hole dimensions are critical.
For projects where precision and endurance are required, this multi-edge design significantly increases the bit’s performance and reliability.
Applications of Half Round Flute 4 Cutter Hammer Drill Bits
The Half Round Flute 4 Cutter Hammer Drill Bit is built for a wide range of construction, installation, and renovation scenarios where dense and abrasive materials are common.
Some of the most common applications include:
Anchor Installation: Drilling precise holes in concrete or brick walls for expansion bolts, rebar dowels, or chemical anchors.
Electrical and Plumbing Channels: Creating paths for conduit and piping systems in concrete floors or walls.
HVAC Mounting: Fastening air conditioning units, ducts, and support brackets onto hard surfaces.
Overhead and Vertical Drilling: The combination of clean dust removal and steady cutting action ensures stable performance when drilling into ceilings or deep wall sections.
Reinforced Concrete Work: The robust cross head helps penetrate occasional rebar intersections without chipping or deviation.
These bits are frequently used in structural engineering, infrastructure projects, commercial fit-outs, and any construction scenario where clean, accurate, and stable holes are required.
Engineered by Fangda Holding Co., Ltd
The Half Round Flute 4 Cutter Cross Head Hammer Drill Bit is manufactured with high-performance standards by Fangda Holding Co., Ltd, a factory focused on precision tooling for professional drilling solutions. Through advanced production methods and strict quality control, Fangda ensures that each drill bit meets the demands of today's construction environments.
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Can this drill bit maintain drilling accuracy when encountering rebar?
The 4-cutter cross head design helps keep the bit centered when contacting reinforcing steel, reducing deviation and supporting more accurate hole positioning.
Why does dust removal matter during concrete drilling?
Efficient dust evacuation reduces friction inside the hole, minimizes heat buildup, and helps maintain consistent drilling speed, especially during deep-hole applications.
Will the bit become stuck in deep concrete holes?
The half round flute is designed to move drilling debris out of the hole efficiently, helping reduce clogging and improving drilling continuity in deeper applications.
How does the 4-cutter design improve hole quality?
The four carbide cutting edges create a more balanced cutting action, helping produce cleaner and more accurately sized holes for anchors and fasteners.
Can this bit handle continuous drilling on construction sites?
The combination of alloy steel construction and YG carbide cutting tips is designed to support demanding drilling tasks and extended use in professional environments.
Does the bit reduce vibration during hammer drilling?
The symmetrical cross head geometry helps distribute impact forces more evenly, contributing to smoother drilling performance and reduced vibration.
Is this drill bit suitable for overhead drilling applications?
Yes. The efficient flute design assists with debris removal, making it suitable for ceiling installations and other overhead drilling tasks where dust buildup can affect performance.
Why do some concrete drill bits wear out quickly on hard aggregates?
Inferior cutting materials may lose sharpness rapidly. The YG carbide tip is engineered to provide improved wear resistance when drilling through abrasive construction materials.
Can the bit be used for anchor bolt installation projects?
Yes. Its stable drilling performance and accurate hole formation make it suitable for preparing holes used in expansion anchors, chemical anchors, and fastening systems.
What advantages does a half round flute offer compared to conventional flute designs?
The half round flute promotes faster dust discharge, helps reduce drilling resistance, and supports more efficient drilling progress in concrete, brick, and masonry materials.