Why crontab umask not using default?

Issue

• When a file is created by root it shows permissions 644, but when the file is created by cronjob in the same path it shows 640 permissions (expected permissions are 644).

user: root
umask: 0022
/etc/crontab is default.

[root@server ~]#  rpm -qa cronie*
cronie-1.4.4-12.el6.x86_64
cronie-anacron-1.4.4-12.el6.x86_64
[root@server ~]# umask
0022
[root@server ~]#  /bin/ls -l /tmp/crontest/file_by_cron
-rw-r----- 1 root root 0 Oct  3 12:52 /tmp/crontest/file_by_cron