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Corporate History

The NMB Splice Sleeve System was invented over 55 years ago by Dr. Alfred A. Yee, an accomplished American structural engineer. We continue to develop and offer this system as a solution for today’s challenging construction requirements.

Since its establishment in 1977, we, the pioneers of the grout-filled rebar coupler, have developed and released the NMB Splice Sleeve. The Splice Sleeve is ideal for the precast concrete construction industry, has excellent seismic resistance and fatigue performance, and does not require any personnel with special certifications to make the connection. We are proud of the great contribution we have made to the development of the precast concrete construction method in Japan, an earthquake-prone country.

Shortly After selling the first grout-filled rebar splices, we experienced the Great Guam Earthquake (1993) and the Great Hanshin-Awaji Earthquake (1995). We conducted a survey of precast structures under/after construction using our splices and confirmed that there were no structural damages at all.

In the year 2000, we developed and began the distribution of Slim-Sleeves for the cast-in-place construction method, and its application is steadily expanding. After subsequent natural disasters, the Great East Japan Earthquake (2011) and Kumamoto Earthquake (2016), we again surveyed the companies utilizing the Splice Sleeve and confirmed that there was no structural damage to any of them.

In many countries overseas, there are no earthquakes, but we will continue to focus on providing high-performance and high-quality services. Our sustainable growth is rooted in our joint research with universities in Japan and overseas, and by further promoting the expansion of NMB applications in around the world.

We strive to contribute tremendously to the world construction industry.

Ala Moana Hotel (2)

The NMB Splice Sleeve was born in the late 1960s and first utilized in the precast concrete construction of a 38-story Ala Moana hotel in Honolulu, Hawaii. Since then, the application has been utilized in a variety of applications, from a single home to the skyscrapers, and from infrastructure to clean energy facilities. The NMB System has withstood four strong earthquakes (Mw 6.9, 7.0, 7.8, and 9.0) with no structural damage, saving many lives as a result.

The first NMB project, a 38-story Ala Moana Hotel, was able to cut 8 months off the projected schedule thanks to the NMB Splice Sleeve. Generally, consumers report a 20% difference in terms of saved time if using precast concrete verses cast-in-place.


  • 1977

    Splice Sleeve Japan, Ltd.(SSJL) was established to exclusively manufacture and sell the world's 1st grout-filled mechanical coupler, NMB Splice Sleeves.

  • 1981

    NMB Splice Sleeves started dominating the primary market of 5-story precast concrete housing projects under the Housing and Urban Development Board (HUD) of Japan.

  • 1987

    NMBs were first used in a high-rise application, the 30-story residence tower, Shin Kawasaki.

  • 1988

    Splice Sleeve North America, Inc.(SSNA) was established as a California corporation in Sacramento.

  • 1991

    NMBs were used in the construciton of the 30-story, 5000+ room MGM Grand Hotel in Las Vegas.



  • 1994

    7.8 Magnitude Earthquake on Island of Guam, all projects using NMBs had no damage.

  • 1995

    6.9 Magnitude Great Hanshin Earthquake on Kobe in Japan, all projects using NMBs had no damage.

  • 1998

    Continuing global expansion, Splice Sleeve (S) Pte Ltd was officially registered and established in Singapore.

  • 1999

    NMBs were used in precast columns in the 39-story Paramount Tower, San Francisco.

  • 2001

    NMB Splice Sleeve was recognized as a Type 2 coupler by ICBO ER-5645 and NER-217.

  • 2002

    NMBs were used in precast columns in the 56-story Shiodome H residential tower in Tokyo.

  • 2007

    NMBs were used in high-strength precast concrete columns in the 59-story Park City Musashi-Kosugi residential tower near Tokyo.

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  • 2009

    NMBs were used in precast columns in the 50-story Singapore Public Housing Project, The Pinnacle@Duxton.

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  • 2011

    9.0 Magnitude Great East Japan Earthquake on Tohoku in Japan, all projects using NMBs had no damage.

  • 2016

    7.0 Magnitude Earthquake on Kumamoto in Japan, all projects using NMBs had no damage.

  • 2018

    NMB Splice Sleeve system was tested to meet International Standard ISO15835 in Singapore.

  • 2020

    NMBs were used in high-strength precast concrete columns in 100+-story Australia 108 in Melbourne.

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