Overview

ClassNK (Nippon Kaiji Kyokai) is a non-profit ship classification society headquartered in Chiyoda, Tokyo, Japan, founded in 1899. It is estimated to employ 1,000 to 5,000 people with revenue in the $250 to $500 million range (estimated band). It provides ship classification, statutory certification, surveys, and management system certification to the maritime sector, and its services extend to automotive, renewable energy, industrial equipment, and aerospace clients. In a recent development, ClassNK issued the first certificate under an ICAO-approved sustainable aviation fuel scheme in Asia, reported by IBTimes JP.

At a glance

What ClassNK - Nippon Kaiji Kyokai makes

The organization is certified to ISO 9001, ISO 14001, ISO 45001, and ISO 50001, and its service areas include alternative fuels, decarbonization, ship recycling, and cyber security.

Products and capabilities described on the company's own site include Gear (source: classnk.com).

Certifications

ClassNK - Nippon Kaiji Kyokai is associated with the following certifications in public sources. Confirm the certified scope for the specific plant producing your part:

• ISO 14001 — classnk.com

• ISO 45001 — classnk.com

• ISO 50001 — classnk.com

• ISO 9001 — classnk.com

Latest developments

• 2026-09-08 — ClassNK issues first certificate under Asia's ICAO-approved SAF scheme | IBTimes JP (ibtimes.com)

• 2026-02-16 — Press Release (or.jp)

• 2026-01-09 — Shaping Class for the Future | Robban Assafina (assafinaonline.com)

• 2025-11-05 — ClassNK buys NAPA for €53m – Digital Ship (thedigitalship.com)

• 2025-11-05 — Cloud-based storage of Ship Construction Files – Digital Ship (thedigitalship.com)

• 2025-06-25 — Topics | ClassNK - English (classnk.com)

Company details

ClassNK describes itself as managing a register of over 270 million gross tons, about 20% of the world's merchant fleet, through a network of 130 surveyor offices worldwide. ClassNK - Nippon Kaiji Kyokai was founded in 1899, has an estimated 1,000-5,000 employees, and is headquartered in Chiyoda, Tokyo. On the LightSource stability read it is rated "Established & active": 127 years in operation (founded 1899). Holds ISO 14001, ISO 45001, ISO 50001, ISO 9001 certification(s) per public sources.

Frequently asked questions

What does ClassNK - Nippon Kaiji Kyokai make?

ClassNK (Nippon Kaiji Kyokai) is a non-profit ship classification society headquartered in Chiyoda, Tokyo, Japan, founded in 1899. It is estimated to employ 1,000 to 5,000 people with revenue in the $250 to $500 million range (estimated band). It provides ship classification, statutory certification, surveys, and management system certification to the maritime sector, and its services extend to automotive, renewable energy, industrial equipment, and aerospace clients. In a recent development, ClassNK issued the first certificate under an ICAO-approved sustainable aviation fuel scheme in Asia, reported by IBTimes JP.

Where is ClassNK - Nippon Kaiji Kyokai headquartered?

ClassNK - Nippon Kaiji Kyokai is headquartered in Chiyoda, Tokyo (7, Chiyoda, Tokyo, 102-0094).

When was ClassNK - Nippon Kaiji Kyokai founded?

ClassNK - Nippon Kaiji Kyokai was founded in 1899.

How big is ClassNK - Nippon Kaiji Kyokai?

ClassNK - Nippon Kaiji Kyokai has an estimated 1,000-5,000 employees, with revenue in the $250-500M range (estimated).

What certifications does ClassNK - Nippon Kaiji Kyokai hold?

ClassNK - Nippon Kaiji Kyokai lists ISO 14001 · ISO 45001 · ISO 50001 · ISO 9001 on its website. Confirm the certified scope for the specific plant producing your part.

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Last verified Nov 2026. Is this your company? Request a correction.