Osaka Tokushu Kokan Mfg. Co., Ltd.
Verified listingOsaka Tokushu Kokan Mfg. Co., Ltd. (株式会社大阪特殊鋼管製造所, O.T.K.) is a Japanese manufacturer of large-diameter, heavy-wall welded steel pipe, founded in 1937 and incorporated in 1957. The company operates one of Japan's largest press-forming lines, including 15,000-ton and 12,000-ton presses, producing custom and special-specification longitudinally welded pipe for energy, power generation, construction, and industrial machinery sectors. O.T.K. holds API Spec 5L (line pipe), API Spec 2B (structural steel pipe), and API Spec 5LD (clad line pipe) monograms as well as ISO 9001 and numerous JIS certifications. The company has 136 employees across four locations including its Osaka headquarters, Shiga plant, and Tokushima plant.
Product lines
Gearbox Parts
No product family confirmed yet. Browse Gearbox Parts
Manufacturing & Fabrication
No product family confirmed yet. Browse Manufacturing & Fabrication
Structural Pipe & Piling
No product family confirmed yet. Browse Structural Pipe & Piling
Welded Steel Pipes
No product family confirmed yet. Browse Welded Steel Pipes
Locations
| Site | Type |
|---|---|
Headquarters - Osaka2-8-24 Mitejima, Nishiyodogawa-ku, Osaka, Osaka, 555-0012, JapanOffers All product lines | Headquarters |
| Licensed facility | |
Shiga PlantShiga, Shiga, JapanOffers All product lines | Manufacturing |
Tokushima PlantTokushima, Tokushima, JapanOffers All product lines | Manufacturing |
Service area
Certifications
Company-wide (no site given)
| ISO 9001 | — | Company claim — not verified against the issuer |
Verified: matched to API’s Composite List.
Contacts
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