Sakagami Seisakusho Ltd.
Japanese hydraulic and pneumatic sealing specialist founded in 1897, manufacturing rubber and resin seals, packings, wipers, and bellows for industrial machinery.
Last updated September 27, 2026
AI crawler reads
No AI crawler has read this profile since Oct 28, 2026.
Overview
Sakagami Seisakusho Ltd. is a Japanese manufacturer of hydraulic and pneumatic sealing components, headquartered in Sumida-ku, Tokyo. The company traces its origins to 1897, when Hatsuzo Sakagami began manufacturing leather power transmission belts in Sumida-ku, Tokyo. It was reorganized as Sakagami Firm Ltd. in 1934 and changed its name to Sakagami Seisakusho Ltd. in 1942. Over more than a century, Sakagami has specialized in seals and packings for hydraulic and pneumatic cylinders, serving railway, industrial machinery, and general engineering customers. The company describes itself as an integrated seal manufacturer, producing synthetic rubber seals, synthetic resin seals, and various bellows. Its product history includes milestones such as Japan's first leather U packing in 1916, the release of KS-standard O-rings in 1955, JIS-standard O-rings in 1961, S-RETHANE rubber products in 1962, and numerous packing and wiper series introduced from the 1960s through the 2000s. More recent developments include soft wipers, S-FLON tape wear rings, and high-performance HNBR material products. Sakagami operates production facilities including the Head Office Funabashi Works and Aomori Works, with sales offices in Nagoya and Hiroshima. The company maintains ISO9001 quality management and ISO14001 environmental management certifications, as well as ISO45001 occupational health and safety certification. Its products are compliant with RoHS2 directive (EU) 2015/863. The company is privately held, with capital of 200 million yen (authorized capital 800 million yen), and is led by President Masao Takaishi. As of April 2026, it employed 407 people. Sakagami positions itself as a customer-oriented, quality-focused supplier that anticipates the needs of the times. Its management philosophy emphasizes contributing to the world through seal solutions, innovating technique, pursuing quality, treasuring the environment, and respecting people. The company also actively warns customers about counterfeit products and recommends purchasing through legitimate sales channels.
History
Sakagami Seisakusho Ltd. traces its origins to 1897, when Hatsuzo Sakagami started manufacturing leather power transmission belts in Sumida-ku, Tokyo. In 1916, the company launched Japan's first leather U packing (25 inches diameter). In 1925, the first Japan-made leather seals were approved and purchased for brake cylinders by the Japanese Ministry of Railway (currently Japan Railroad). The company was reorganized as Sakagami Firm Ltd. in 1934 with a capital of 100 thousand yen. In 1941, a laboratory was opened in Koiwa, Edogawa-ku, Tokyo. In 1942, the company name was changed to Sakagami Seisakusho Ltd. with capital of 1 million yen. In 1944, the head office was moved from Honjoyokokawabashi to Kinshicho, its present location. In 1946, the Ministry of Railway appointed the company as a cooperative and authorized parts supplier. In 1952, it was appointed to be a committee member of Japan Industrial Standard (JIS) for leather belts and was awarded by the Minister of Commerce for contributions to the development of domestic railways at the 80th anniversary of Japan National Railways. In 1955, O-rings of "KS" standard were released. In 1960, a Nagoya office was opened. In 1961, the company obtained the license of JIS certified O-ring manufacturing and released O-rings of JIS standard. In 1962, products made of S-RETHANE rubber were released. In 1963, KY-Packings were released. In 1964, Funabashi Works commenced operation in Funabashi-city, Chiba-pref. In 1966, a Fukuyama liaison office was built in Fukuyama-city, Hiroshima-pref., and SKY-Packings and SDR-Wipers were released. In 1967, ST-Seals and Wear rings were released. In 1968, Mini Y-Packings (MYN-type) were released, and the company was appointed to be a committee member of JIS standardization of V-Packings. In 1969, seals for power steering were released, and the Fukuyama liaison office was moved to Hiroshima-city and became Hiroshima liaison office. In 1970, S-KID® rubber (non-lubricant material) was developed, GLY-Packings and Mini-Y Packings (MYA-type) maintenance-free series were released, and Funabashi Works were approved as a JIS certified O-ring manufacturing factory. In 1974, the capital was increased to 200 million yen. In 1975, the company was awarded by the Minister of Transport for contributions to the development of integral parts for railways. In 1979, LUBE-RUN® low-abrasion material for pneumatic seals was developed, and PGY-Packings and PNY-Packings of LUBE-RUN were released. In 1981, compact type wiper, PSD-Packings (for pistons), and NPU-Packings (rod packing + wiper in one piece structure) were released as LUBE-RUN® series. In 1983, PDU-Packings were released as rod packing + wiper in one piece structure. In 1984, double acting HSD-Packings were released for hydraulic cylinder pistons. In 1985, Nagoya office was moved to the present location and the building was renewed. In 1986, RGY-Packings and RNY-Packings were released as high-performance packings for hydraulic cylinders. In 1988, TSGY-Packings and TSNY-Packings were released for wider temperature range application. In 1989, Mr. Masao Takaishi was inaugurated as president. In 1990, works at Head Office were newly built. In 1991, double acting RGU-Packings and PWL-Bearing (back-up ring + resin wear ring) were released. In 1992, Hiroshima liaison office was renamed. In 1995, SMJ-Rod seals (high sealing performance) were released. In 1996, PPD-Packings (improved PSD for eccentricity) were released for non-machine cut pneumatic cylinders. In 1999, MYP-Packings were released for extra durable pneumatic cylinders. In 2003, soft wipers (configuration of fiber assembly), S-FLON® Tape Wear ring, SWO-Wear rings, and SMD-Wipers were released. In 2005, ferrule gaskets for sanitary piping were released. In 2011, high-performance HNBR material products for RGY-Packings, SKY-Packings, and SDR-Wipers were released. The company continues to operate as a privately held manufacturer with production facilities in Funabashi and Aomori, and sales offices in Nagoya and Hiroshima.
- 2011
High-performance HNBR material products for RGY-Packings, SKY-Packings, and SDR-Wipers released.
- 2003
Soft wipers, S-FLON® Tape Wear ring, SWO-Wear rings, and SMD-Wipers released.
- 1989
Mr. Masao Takaishi inaugurated as president.
- 1979
LUBE-RUN® low-abrasion material for pneumatic seals developed.
- 1974
Capital increased to 200 million yen.
- 1970
S-KID® rubber developed; Funabashi Works approved as JIS certified O-ring manufacturing factory.
- 1964
Funabashi Works commenced operation in Funabashi-city, Chiba-pref.
- 1961
Obtained license of JIS certified O-ring manufacturing; JIS standard O-rings released.
- 1955
O-rings of "KS" standard released.
- 1944
Head office moved to Kinshicho, the present location.
Products and positioning
Integrated seal manufacturer specializing in hydraulic and pneumatic sealing solutions, emphasizing quality, innovation, and customer-oriented service.
S-KID® rubber
Non-lubricant material developed in 1970.
LUBE-RUN®
Low-abrasion material for pneumatic seals developed in 1979.
S-FLON® Tape Wear ring
Released in 2003.
KY-Packings
Released in 1963.
SKY-Packings
Released in 1966.
SDR-Wipers
Released in 1966.
ST-Seals
Released in 1967.
RGY-Packings
High-performance packings for hydraulic cylinders, released in 1986.
RNY-Packings
High-performance packings for hydraulic cylinders, released in 1986.
Sources5 sources
Cite this profile: Cite the canonical profile. /brand-wiki/sakagami-seisakusho-ltd-japan · Editorial policy · How profiles are compiled