Class overview
Builders:	Central Design Bureau for Marine Engineering "Rubin" Shipyard 199 "Krasnoe Sormovo", Nizhniy Novgorod (Gorkiy) Shipyard 112,"imeni Leninskogo Komsomola", Komsoloľsk na Amure Shipyard "Leningradskoe Admiralteyskoe Obedinenie" (Admiralteyskie Verfi), Saint Petersburg (Leningrad) Shipyard "Severnoe Mašinostroiteľnoe Predprijatie", Severodvinsk
Operators:	Soviet Navy  Russian Navy  People's Liberation Army Navy  Indian Navy  Islamic Republic of Iran Navy  Polish Navy  Romanian Naval Forces  Algerian National Navy  Vietnamese People's Navy
Preceded by:	Tango-class submarine
Succeeded by:	Lada-class submarine
In commission:	April 1982
Building:	7
Completed:	57
Active:	48
Retired:	2
General characteristics
Displacement:	Surfaced: 2,300–2,350 tons Submerged:3,000-3,950 tons full load
Length:	70.0–74.0 m
Beam:	9.9 m
Draft:	6.5 m
Depth of hold:	Operational: 240 meters Maximum: 300 meters
Installed power:	Diesel-electric
Propulsion:	Diesel-electric propulsion 2 x 1000 kW Diesel generators 1 x 5,500–6,800 shp Propulsion motor 1 x fixed-pitch 6 or 7 bladed Propeller(6BL project 877) (7BL project 636)
Speed:	Surfaced: 10–12 knots Submerged: 17–25 knots
Range:	With snorkel: 6,000–7,500 miles at 7 knots Submerged: 400 miles at 3 knots Full run: 12.7 miles at 21 knots
Endurance:	45 days
Test depth:	300 m
Complement:	52
Armament:	6/533 mm torpedo tubes 18 torpedoes Club S anti-ship missiles (only on some export versions) 24 mines 8 SA-N-8 Gremlin or 8 SA-N-10 Gimlet Surface-to-air missiles (export submarines may not be equipped with air defense weapons)