ClassNK approved manufacturers
Browse 217 manufacturer and works approval records published by ClassNK — Nippon Kaiji Kyokai. Search for a company, narrow the list by country and check the approved facility and scope before you rely on a supplier.
Search scope
Search groups on this page: Type Approval, MED / MER / EU Mutual Recognition, Design Approval, RCD, Welding Consumables, Manufacturer Workshop Approvals, and Service Suppliers. Original approval names and certificate scope remain visible in each record.
Product search groups: Type Approval, MED / MER / EU Mutual Recognition, Design Approval, RCD, and Welding Consumables. Search grouping does not make different approval schemes equivalent. Original approval names and certificate scope remain visible in each record.
Please note that search results on this page are available specifically for Service Suppliers certificates.
Please note that search results on this page are available specifically for Manufacturer Workshop Approvals.
Results on this site are for information only. Verify certificate validity on the issuing society’s website using the source link when available. A source portal may require a further search.
Last updated: 16.09.2026
Certificate details
ClassNK at a glance
Top works approval categories
- Engines and machinery72
- Steel, castings and forgings40
- Pipes, valves and hoses23
- Cargo securing and deck equipment18
- Control, automation and monitoring systems14
- Cables and electrical equipment12
- Pressure vessels and heat exchangers12
- Fire protection and fire doors5
Top countries / regions
- Japan132
- Germany19
- China14
- South Korea10
- United Kingdom8
- United States7
- Czechia3
- Denmark3
Figures from the Certificate Finder index, last updated 16.09.2026.
How to verify a ClassNK certificate
- Search by company name, product or certificate number and filter the results to ClassNK.
- Open the record to review the certificate number, scope, approval type and indexed dates.
- Follow the source link to ClassNK — Nippon Kaiji Kyokai and confirm the current validity and scope before relying on the certificate.
Certificate Finder is an independent index and is not affiliated with or endorsed by ClassNK — Nippon Kaiji Kyokai.
More ClassNK records
Approved manufacturers by classification society
DNVAmerican Bureau of Shipping (ABS)Lloyd’s Register (LR)Bureau Veritas (BV)RINAKorean Register (KR)China Classification Society (CCS)Indian Register of Shipping (IRClass)Polish Register of Shipping (PRS)Croatian Register of Shipping (CRS)Türk Loydu (TL)