0002043630 2026-09-21 2026-09-21 0002043630 apac:UnitsEachConsistingOfOneClassAOrdinaryShareParValue00001PerShareAndOneRightToAcquireOnetenthOfOneClassAOrdinaryShareCustomMember 2026-09-21 2026-09-21 0002043630 apac:ClassAOrdinarySharesParValue00001PerShareCustomMember 2026-09-21 2026-09-21 0002043630 apac:RightsEachRightToAcquireOnetenthOfOneClassAOrdinaryShareCustomMember 2026-09-21 2026-09-21 false 0002043630 8-K 2026-09-21 STONEBRIDGE ACQUISITION II CORPORATION E9 001-42871 One World Trade Center Suite 8500 New York NY 10007 646 314-3555 false false false false Units, each consisting of one Class A Ordinary Share, par value $0.0001 per share, and one Right to acquire one-tenth of one Class A Ordinary Share APACU NASDAQ Class A Ordinary Shares, par value $0.0001 per share APAC NASDAQ Rights, each Right to acquire one-tenth of one Class A Ordinary Share APACR NASDAQ true false