To use your umask, you must deactivate the "Save permissions" option.
For more information check man and search for umask:
Preserve attributes
determines whether to preserve the permissions, timestamps and (if you
are root) the ownership of the original files. If this option is not
set, the current value of the umask will be respected.
Strike>
mc , umask umask, ~/.bashrc.
umask 0007, ~/.bashrc :
umask 0007
mc .
debian jessie .
umask :
http://www.cyberciti.biz/tips/understanding-linux-unix-umask-value-usage.html