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