Overview of Threading Tools

This document provides detailed specifications, recommended cutting conditions, and usage guidelines for various threading tools including taps and thread mills designed for machining hardened steels and pre-hardened materials.

1. Product Types and Descriptions

• Epoph Super Hard Tap (A569): Designed for stable machining of hardened materials with hardness above 50 HRC.
• Epoch Hard Tap (A570/A571): Suitable for pre-hardened steels (35-45 HRC) and hardened steels (45-50 HRC), enabling stable thread cutting.
• Epoch Thread Mill (ET-PN series): Used exclusively for internal thread cutting in hardened steels (45 HRC and above), with various sizes and pitches.
• Epoch D Thread Mill (EDT-TH series): Allows simultaneous pilot hole drilling and thread cutting in hardened materials (45 HRC+), featuring oil holes for coolant delivery in some models.
• Carbide Threading Cutters: Mentioned as part of the product range but detailed specs are not included.

2. Dimensions and Specifications

Each tool type is provided with detailed dimensional data including:

• Thread size (M3 to M12)
• Pitch (0.5 to 1.75 mm)
• Thread length and overall length (varies by size)
• Shank diameter
• Number of flutes
• Tool type classification (A, B, C types)
• Thread accuracy and pitch diameter tolerance zones (d2 tolerance in micrometers)

Dimensions are given in millimeters.

3. Recommended Cutting Conditions

Cutting speeds and feed rates are specified based on workpiece hardness and tool type:

• Epoph Super Hard Tap: Cutting speeds of 2-5 m/min for 50-55 HRC hardened steel, 1-3 m/min for 55-60 HRC.
• Epoch Hard Tap: Cutting speeds of 3-6 m/min for pre-hardened steel (35-45 HRC), 2-4 m/min for hardened steel (45-50 HRC).
• Epoch Thread Mill and Epoch D Thread Mill: Detailed rpm, feed rate (mm/min), and per-tooth feed (mm/tooth) values are provided for various tool diameters and hardness ranges (45-65 HRC). For example, rpm ranges from approximately 1,240 to 7,300 depending on hardness and tool diameter.

4. Usage Notes and Recommendations

• Tap accuracy does not guarantee the accuracy of the internal thread.
• Epoch Thread Mill and Epoch D Thread Mill are exclusively for internal thread machining.
• Machining centers equipped with NC (numerical control) and helical interpolation functions are required for thread milling.
• NC program examples for these tools are available for download from the manufacturer's website (hitachi-tool.co.jp).
• For tools with oil holes (Epoch D Thread Mill), coolant must be supplied through the oil hole to prevent debris ingress and machine damage.
• Thread depth recommendations: up to 2× or 2.5× the nominal thread diameter depending on tool model.

5. Stock and Availability

Many items are manufacturer stocked (marked with ◎), and customers are advised to contact sales for availability.

6. Summary of Key Parameters

7. Additional Information

New product releases and detailed cutting condition tables are referenced (e.g., New Product News No. 1014). Units are consistently in millimeters. The document emphasizes the importance of using appropriate machinery and following recommended parameters to ensure tool performance and workpiece quality.