Apex to back, in a bevel gear or hypoid gear, is the distance in the direction of the axis from the apex of the pitch cone to a locating surface at the back of the blank.
Salary DOE means that the salary depends on experience of the candidate. A similar term is DOQ which means salary depends on qualification. Be careful with DOE job offers with small companies where they only can fill one position. Every position ...
(Hint: Every MBA dreams of one, LOL) 5 (Five) figure salary means: 10,000 to 99,999. 6 (Six) figure salary means: 100,000 to 999,999. 7 (Seven) figure salary means: 1,000,000 to 9,999,999... and so on. Now, I know that it is the dream of every new MBA graduate to get a job offer with 6 figure salary, LOL.