Description

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The GPT Series micro boring tools are designed for general-purpose machining of steel components. Manufactured from premium cemented carbide, these precision boring tools deliver stable performance and high surface quality in carbon steel, alloy steel, gray cast iron, and copper alloy boring applications.

Key Features

General-Purpose Steel Machining

Optimized geometry for efficient boring of carbon steel and alloy steel components below 35HRC hardness, delivering reliable performance in everyday production.

Micro-Precision Boring

Designed for micro-diameter boring operations with tight tolerances. The TR (Trapezoidal Radius) geometry enables precision internal facing and finish boring.

Premium Cemented Carbide

Manufactured from high-quality tungsten-carbide-based cemented carbide, leveraging SW's complete tungsten industry chain for superior wear resistance and tool life.

Multi-Material Capability

While optimized for steel, the GPT Series also performs well on gray cast iron, ductile cast iron, and copper alloy, providing versatility across different workpieces.

Workpiece Material Suitability

Workpiece Material	Suitability
Carbon Steel, Alloy Steel (<35HRC)	Most Suitable
Alloy Steel, Tool Steel (35-48HRC)	Suitable
Stainless Steel	Not Recommended
Gray Cast Iron, Ductile Cast Iron (<35HRC)	Most Suitable
Cast Aluminum Alloy (Si<12%)	Not Recommended
Copper Alloy (<HB200)	Suitable
Heat Resistant Super Alloy (<HB450)	Not Recommended
Titanium Alloy (<HB400)	Not Recommended
Hardened Steel (45-55HRC)	Not Recommended
Hardened Steel (55-60HRC)	Not Recommended

Product Specifications

Parameter	Value
Specification	GPT-TR40R20L15
Dimension	TR D4 * R0.2 * 15 * 50 * d4
Tool Type	Micro Boring Tool (Class P - Steel)
Workpiece Material	Steel Parts S48C (HRC 26)
Cutting Speed	125 m/min (5000 RPM)
Feed Rate	0.03 – 0.05 mm/r
Cutting Depth (ae)	0.05 mm
Cooling Method	Oil cooling / External cooling
Cutting Method	Continuous internal facing / Finish boring
Substrate Material	Cemented Carbide (Tungsten Carbide)

Application Case

Specification: GPT-TR40R20L15

Dimension: TR D4 * R0.2 * 15 * 50 * d4

Workpiece: Steel parts S48C (HRC 26)

Cutting Speed: 125 m/min (5000 RPM)

Feed Rate: 0.03 – 0.05 mm/r

Cutting Depth: ae = 0.05 mm

Cooling: Oil cooling / external cooling

Method: Continuous internal facing / Finish boring

In this application, the GPT-TR40R20L15 micro boring tool achieved stable finish boring of S48C steel parts at a cutting speed of 125 m/min with a feed rate of 0.03–0.05 mm/r. The oil cooling method effectively managed heat at the cutting zone, ensuring dimensional accuracy and a high-quality surface finish throughout the continuous internal facing operation.Related Products.