Some are, but some aren't. I can't really figure out why some have it and some seem to have more of a waxy finish. The carpenters hatchet handles I've bought all had the waxy coating, while it's been a mix when buying axe handles. I usually just sand off the varnish and use BLO. It's more work, but I can't stand varnished handles.
Edit: oops, missed you question. A haft is the handle, and an older axe term. Re-hafting is the same as re-handling a head.
the old OP LINK and the new Seymour Link handles at Ace and sears are graded, and if you learn the grading system that Seymour uses now, its very easy to break the handles down to what is on them whether they are plain, wax finished, or lacquer/varnished, and even fire finished like the sears handles.
Seymour grading system goes like this.
grade 01 is top quality with a yellow finish
grade 02 is top quality with wax finish
grade 04 is medium quality with a wax finish
grade 19 is medium quality with lacquer finish
grade 08 is low quality with a wax finish
the sears craftsman handles have been of better quality in my experience, but slim selections. i think they are mid grade handles that are fire finished. i rarely find a twisted or crooked craftsman handle, but MOST of the handles i find at most ACE are crooked and or twisted or both, and with terrible grain orientation. very obviously the lowest grade Seymour offers.
i have never had an issue with Ace hatchet handles, but i have been using more Baker handles from Menards for full size axes. gotta sort through a bunch to find the good ones, but i have found some beautiful handles with great grain.
i wish we still had the old OP Links, they were great handles, made of great wood, and the patterns were so much better, slimmer, and with out the huge knobs on the ends...