Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
A hammer in a dream indicates a policeman, an aide to the ruler, or a person who divides people. Striking with it indicates victory over enemies.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
A hammer indicates strength, might, and sustenance. Hearing its sound indicates a dispute and ugly speech.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
A hammer is interpreted as a formidable and strong man. Striking with it indicates conquering enemies and facilitating difficult matters.