50mm (2") TCT Hole Saw for Stainless Steel & Metal

Experience a new level of cutting speed and efficiency with our 50 mm (2 inch) TCT hole saw. Designed for demanding applications, this tool cuts clean, precise holes in tough materials such as stainless steel and cast iron up to ten times faster than standard bi-metal hole saws. Thanks to its advanced design and durable construction, it is the perfect choice for home installations, electrical work, and professional production.

Key Features & Benefits:

Advanced TCT design: This hole saw features extremely hard (91 HRA) tungsten carbide steel teeth in a unique three-blade design (Three different edge types-outer, middle, and inner.) for exceptional sharpness and efficiency. This configuration ensures a smoother, faster cut, making it ideal for hard metals.

Superior Speed & Efficiency: The tough tungsten carbide teeth extend beyond the inner and outer walls. This design feature reduces friction, allowing for significantly faster cutting. Power through sheet metal, pipes and plates with minimal effort and reduced power consumption.

Enhanced durability: Built for a long service life, this tool features a unique dovetail tooth design and thicker side walls for greater strength. It has been shown to demonstrate a longer service life than high-speed steel hole cutters when tested on stainless steel over 0.6 mm thick.

Secure, no-slip grip: The 3/8″ three-fluted shank provides a strong, steady grip in your drill’s chuck, preventing slipping during high-torque applications and maximising power transfer from the tool to the cutting surface.

Replaceable Pilot Drill: An integrated twist drill bit acts as a stable guide for precise hole placement. Should the pilot drill break, it can be easily disassembled and replaced using the included hex key.

We used a bench drill to test the maximum number of holes the TCT hole saw could cut in 1.2mm thick stainless steel and the average cutting speed per hole at different stages. This evaluated the product’s quality.

The final test result was 420 holes.

Below are the average tested speeds per hole.

Hole Quantity	Average Drilling Time	Hole Quantity	Average Drilling Time
1-50	8 second	350-380	10-11 second
51-100	8-9 second	381-400	11 second
101-150	8-9 second	401-410	11 second
151-200	8-9 second	411-413	11-12 second
205-250	9-10 second	414-417	12 second
251-300	9-10 second	418-419	12 second
305-350	10 second	420	21 second

Versatile Applications

This TCT hole saw is perfect for cutting quick, precise holes in a wide range of materials.

Recommended For: Stainless Steel, Mild Steel, Iron, Cast Iron, Aluminum, Copper, Brass, Plastic.

Not Recommended For: Concrete, tiles, stone, or other masonry materials.

Compatibility:

For your convenience, this hole saw is compatible with a variety of common tools, including:

Cordless Drill
Drill Press
Magnetic Drilling Machine
Bench Drills

Specifications

Outside Diameter: 50mm (2 inches)

Effective Cutting Depth: 30mm

Material: Tungsten Carbide Tipped (TCT) Steel

Shank: 3/8″ 3-Flatted Shank

Package Includes
1 x 50mm (2″) TCT Carbide Tip Hole Saw

1 x Allen Wrench

Notes

To prevent tooth chipping, maintain a steady cutting motion and avoid sudden, forceful impacts between the cutting edge and the material.

When cutting thicker materials, applying water or coolant during operation is recommended to keep the tool cool and extend its life.

FAQ

91 HRA to HRC conversion

Quick Answer

The hardness of 91 HRA is approximately equivalent to 78 HRC. Detailed values can be found in this table.

Key Differences Between HRA and HRC Scales

The main differences between the HRA and HRC scales are the test load and the intended application, both of which are determined by the type and thickness of the material.

Feature	HRA (Rockwell A)	HRC (Rockwell C)
Major Load	60 kgf	150 kgf
Indenter	Diamond Cone	Diamond Cone
Primary Use	Very hard or thin materials	Hardened steels & other hard metals

Detailed explanation of the scales:

HRA (Rockwell A Scale):

The HRA scale uses a diamond cone indenter with a relatively light major load of 60 kgf.

Applications:

Extremely hard materials: The HRA scale is primarily used to test materials such as cemented and tungsten carbides and hard ceramics. The lighter load prevents potential fracture or damage to these brittle materials or to the indenter, which could occur with the higher force of the HRC scale.
Thin materials: This scale is suitable for testing thin sheets of steel or surfaces with shallow case hardening. A heavier load would penetrate the hardened layer, providing an incorrect measurement of the softer core material underneath.

HRC (Rockwell C Scale):

The HRC scale uses the same diamond cone indenter, but applies a much heavier major load of 150 kgf. It is one of the most common hardness tests in the industry.

Applications:

Hardened metals: The HRC scale is the standard for testing the hardness of metals after heat treatment. Common materials tested include hardened tool steels, high-carbon steels, alloy steels and titanium alloys.

However, the deep indentation created by the heavy load means that the HRC scale is not suitable for testing thin materials or brittle substances such as carbides.

Conversion Between HRA and HRC

Empirical Conversion and Limitations

It is important to understand that conversions between hardness scales are not based on a mathematical formula. Instead, they are determined using standardised, empirical conversion tables, such as those published in ASTM E140. These tables provide approximate equivalents.

For example, a hardness of 91 HRA is approximately equivalent to 78 HRC.

Practical Measurement Range

The converted value of 78 HRC is well outside the reliable and practical measurement range of the Rockwell C test. The HRC scale typically tops out around 70 HRC, and reporting values beyond this is not standard practice as the accuracy of the test diminishes significantly.

Conclusion

HRA and HRC are distinct scales designed for different material categories. HRA is suited to extremely hard, brittle, or thin materials, while HRC is the standard for hardened steels and other hard metals. Although conversion tables exist, they only provide only approximations and are subject to the practical measurement limits of each scale.