This standard specifies cylindrical coil springs (hereinafter referred to as springs) that are made of material with a circular cross section and are hot or cold formed among compression springs and tension springs used in ship engine parts.
JIS F 0503:2005 Referenced Document
JIS B 0103 Springs -- Vocabulary*, 2015-12-21 Update
JIS B 2704 Helical compression and extension springs -- Requirements for design, performance test method