A fourth vessel, constructed to a modified design, was built for the Thai Police and was the first to enter service in 1992.

However, the vessel is powered by two Deutz MWM BV16M628 diesel engines turning two shafts with Kamewha controllable pitch propellers rated at 7,102 kW (9,524 hp).

Srinakarin is armed with two twin-mounted 30 mm guns and has Racal Decca 1226 surface search radar.

[2] Srinakarin, the fourth vessel, was ordered by the police in September 1989 from the Ital Thai Marine yard.

Kamronsin was the first naval version to commission on 29 July 1992, followed by Thayanchon on 5 September and Longlom on 2 October.