The main armament of the Bayan-class ships consisted of two 8-inch (203 mm) 45-caliber guns in single-gun turrets fore and aft of the superstructure.
The guns fired a 194-pound (87.8 kg) shell at a muzzle velocity of 2,920 ft/s (891 m/s).
At an elevation of +15°, they had a range of 12,208 yards (11,163 m).
The ships' eight 45-caliber 6-inch (152 mm) Canet Model 1891 quick-firing (QF) guns were mounted in casemates on the sides of the ship's hull.
They fired shells that weighed 91 pounds (41.4 kg) with a muzzle velocity of 2,600 ft/s (792.5 m/s).
They had a range of 12,602 yards (11,523 m) when fired at an elevation of +20°.

A number of smaller guns were carried for close-range defense against torpedo boats.
These included twenty 50-caliber 75-millimeter (3.0 in) Canet Model 1891 QF guns.
Eight of these were mounted in casemates in the side of the hull and in the superstructure.
The remaining guns were located above the 6-inch gun casemates in pivot mounts with gun shields.
The gun fired 10.8-pound (4.91 kg) shells to a range of about 8,606 yards (7,869 m), at an elevation of +20° degrees with a muzzle velocity of 2,830 ft/s (862 m/s).
The Bayan class also mounted eight (Bayan) or four 47-millimeter (1.9 in) Hotchkiss guns in the three later ships.
They fired a 3.2-pound (1.5 kg) shell.
In addition, Bayan was fitted with two 37-millimeter (1.5 in) Hotchkiss guns that fired a 1.1-pound (0.50 kg) shell at a muzzle velocity of 1,540 ft/s (470 m/s).

Bayan was equipped with two submerged 15-inch (381 mm) torpedo tubes, one on each broadside, while those of the three later ships were 18 inches (457 mm) in size.
The main armament of the Bayan-class ships consisted of two 8-inch (203 mm) 45-caliber guns in single-gun turrets fore and aft of the superstructure. The guns fired a 194-pound (87.8 kg) shell at a muzzle velocity of 2,920 ft/s (891 m/s). At an elevation of +15°, they had a range of 12,208 yards (11,163 m). The ships' eight 45-caliber 6-inch (152 mm) Canet Model 1891 quick-firing (QF) guns were mounted in casemates on the sides of the ship's hull. They fired shells that weighed 91 pounds (41.4 kg) with a muzzle velocity of 2,600 ft/s (792.5 m/s). They had a range of 12,602 yards (11,523 m) when fired at an elevation of +20°.
A number of smaller guns were carried for close-range defense against torpedo boats. These included twenty 50-caliber 75-millimeter (3.0 in) Canet Model 1891 QF guns. Eight of these were mounted in casemates in the side of the hull and in the superstructure. The remaining guns were located above the 6-inch gun casemates in pivot mounts with gun shields. The gun fired 10.8-pound (4.91 kg) shells to a range of about 8,606 yards (7,869 m), at an elevation of +20° degrees with a muzzle velocity of 2,830 ft/s (862 m/s). The Bayan class also mounted eight (Bayan) or four 47-millimeter (1.9 in) Hotchkiss guns in the three later ships. They fired a 3.2-pound (1.5 kg) shell. In addition, Bayan was fitted with two 37-millimeter (1.5 in) Hotchkiss guns that fired a 1.1-pound (0.50 kg) shell at a muzzle velocity of 1,540 ft/s (470 m/s).
Bayan was equipped with two submerged 15-inch (381 mm) torpedo tubes, one on each broadside, while those of the three later ships were 18 inches (457 mm) in size.
Bayan-class cruiser