.ssh directory: 700 (drwx------)
public key (.pub file): 644 (-rw-r--r--)
private key (id_rsa): 600 (-rw-------)
#  Home directory
lastly your home directory should not be writeable by the group or others (default 755 (drwxr-xr-x)).
 If you are looking for better security and privacy, you can change the default permissions to 750.