The production of automotive parts and semiconductor equipment components is also expanding in Vietnam, increasing the demand for high-quality threading.

In the threading process, many manufacturing sites face challenges such as:
• Short tap life
• Frequent tool breakage
• Chip clogging
• Quality defects caused by burrs

These issues often result in increased tool changes and setup adjustments, significantly impacting both productivity and product quality.

Addressing these challenges is Tanoi Mfg., a specialized Japanese manufacturer of taps and dies. Through the development of high-performance tapping tools—including forming taps—the company has achieved up to double the machining speed and tool life. In addition, its unique proposal-based support service, “Doctor Sales,” provides hands-on assistance, from on-site analysis of machining issues to post-implementation tool life evaluations, helping improve productivity across the entire process.

This article highlights Tanoi Mfg.’s tapping technologies and key products that are gaining increasing attention in the Vietnamese market.

Tanoi Mfg.: Japan’s Pioneer in Taps and Dies Revolutionizing Threading with Over a Century of Innovation

Tanoi Mfg. is a specialized manufacturer of taps and dies that pioneered tapping tools in Japan. Founded as a designated supplier to the Army and Navy, the company began by producing threading tool holders and hand taps. It later established forming tap technology, which produces threads through plastic deformation rather than cutting. Since then, the company has driven numerous innovations in threading tools, including the development of flat dies and carbide taps.

Today, with production bases in Miyagi and Saitama, Tanoi Mfg. ensures a stable supply of high-quality tapping tools. In 2023, the company celebrated its 100th anniversary and continues to support the global manufacturing industry with the technical expertise it has cultivated over decades. In addition, it has developed a wide range of proprietary products that enhance productivity, such as the “T-Spiral,” a unique design that suppresses hole enlargement, and the “Multi Tap,” a process-integrating tool that combines reaming and tapping into a single operation.

Twice the Machining Speed and Tool Life: Forming Tap “W Tufflet”

One of the flagship products of Tanoi Mfg. is the forming tap “W Tufflet (W-TF Series),” which delivers both high-speed machining and extended tool life. By optimizing the thread profile and applying high-precision surface treatments, friction during machining is significantly reduced. In addition, the use of TiCN coating and heat-resistant high-speed steel greatly enhances wear resistance and durability.

Actual measurements show that tool life is approximately 1.8 to 2.3 times longer compared to conventional taps from other manufacturers.
As a result, it offers:
• Reduced frequency of tool changes
• Shorter setup time
• Lower machining costs

It is particularly effective for machining difficult-to-cut materials such as stainless steel (SUS), as well as for high-precision applications including EV components and semiconductor equipment parts.

▲ Optimized thread profile and coating deliver up to twice the tool life, even in high-carbon steel

▲ Actual measurements show 1.8–2.3× longer tool life vs. other manufacturers (20–40 m/min)

“Seamless Tufflet”: Burr-Free Threading

In forming tap operations, material flow can sometimes generate minute burrs known as “seams.” These seams may lead to quality issues such as:
• Foreign matter contamination
• Assembly defects caused by misalignment (cross-threading)
• Plating defects

These challenges are addressed by the “Seamless Tufflet (SL-TF Series)” from Tanoi Mfg.
This product features a unique design in which side cutting edges remove seams during the return process after thread forming. As a result, it enables:
• Seam-free threading
• Stable internal thread accuracy
• Reduced assembly defects
It is increasingly being adopted in applications that require high-quality threading, such as EV components and precision equipment parts.

▲ Prevents engagement with seams at the thread crest, eliminating cross-threading defects

▲ Internal thread formed by a conventional forming tap: seams remain

▲ Seamless Tufflet: eliminates seams and stabilizes the internal diameter

“Zero-Chip Tap”: Chip-Free Threading

In cutting taps, chip clogging can cause tool breakage and insufficient cooling, leading to machining issues.
The Zero-Chip Tap (ZC Series) is an internally cooled tap featuring a unique design with side-through grooves in the shank.
Compared to conventional internal coolant taps, it offers:
• Approximately twice the coolant flow rate
• Improved chip evacuation
• Enhanced cooling performance at the cutting edge
It is particularly effective in applications prone to chip-related issues, such as blind hole machining and cast iron (FC, FCD).

▲ Side-through grooves integrated into the shank

▲ Coolant flow in a blind hole

Proposal-Based Support “Doctor Sales” for Solving Shop-Floor Challenges

Tanoi Mfg. goes beyond simply supplying tools by promoting its unique proposal-based approach, “Doctor Sales,” which diagnoses and resolves machining challenges on-site. This hands-on support involves analyzing machining conditions and identifying the root causes of problems, followed by proposing the most suitable tools and machining parameters. Rather than ending with product delivery, the company continues to provide support until improvements are verified in actual production. If issues arise, it responds by recommending optimal solutions—such as switching to forming taps—based on specific machining conditions and challenges.

【Support Process】
• Assessment of the operating environment, work materials, and machining conditions
• Analysis of root causes, including tap breakage and wear
• Proposal of the most suitable tools for the application
• Post-implementation tool life evaluation (free of charge)
• Continuous improvement through ongoing monitoring

Growing Adoption of Tanoi Taps in Vietnam’s Manufacturing Industry

In recent years, adoption in the Vietnamese market has been increasing. At a Vietnamese plant of a Japanese pneumatic equipment manufacturer, switching from conventional taps made by other suppliers to the Seamless Tufflet from Tanoi Mfg. has resulted in:
• Stabilized thread quality
• Improved tool life
• Reduced assembly-related issues
These benefits have been confirmed, leading to full adoption of the product at the facility.

In the Vietnamese market, where demand for high-precision machining—such as EV components and semiconductor equipment parts—is growing, the performance of tapping tools has become a critical factor directly impacting both productivity and quality.

At Tanoi Mfg., the “Doctor Sales” approach delivers hands-on support for solving machining challenges, guiding customers from the initial assessment of machining conditions through tool selection to post-implementation tool life evaluation.

【Interview Cooperation】

Tanoi Mfg. Co., Ltd.
Osamu Yoshida

If you are looking for high-performance taps and dies in Vietnam, please feel free to contact us using the inquiry form below.