Screw Crusher

Screw Crusher (スクリュークラッシャー) is Punk's Special Weapon, a spinning saw that first appears in Mega Man III. When used by Punk, the saw is thrown in the direction of his target. When equipped by Mega Man, he throws the saw in a parabolic arc, moving up for a while and then looping down.

Mega Man III
The Screw Crusher is imperative in the battle against the Wily Machine's second form, as it is the only weapon that will harm it. It does considerable damage, and can be used several times as it doesn't use much energy. However only one can be on the screen at a time.

Mega Man 10
Screw Crusher can be obtained by Mega Man by defeating Punk in the Special Stage 2. Mega Man is the only playable character able to use it. In this game Mega Man can have up to four saws onscreen at a time, and it is most effective against Ballade, Pump Man, Chill Man, and the Weapons Archive's data of Ring Man and Tornado Man. It can also be used to disarm some enemy shields when fired fast enough.

Capacity
In both Mega Man III and Mega Man 10, Mega Man can use eight Screw Crushers with only one weapon energy unit. With a full weapon energy gauge, it can be used 152 times in Mega Man III and 224 times in Mega Man 10.

Damage Data Charts
Damage values in units in Mega Man III.

Damage values in units in Mega Man 10.

Trivia

 * Silver Tomahawk almost mirrors Screw Crusher, as S. Tomahawk drops low then arcs up, while S. Crusher goes up then arcs down.