There has been speculation over the contract offer the Giants have on the table for defensive tackle Johnathan Hankins, who somewhat shockingly remains on the open market after finding no great demand for his services.

The offer from the Giants for Hankins is four years, $28 million, The Post has learned.

“At some point, you got to be pragmatic about it,’’ said a source familiar with the offer.

Hankins finally made his first visit to another team this week, traveling on Tuesday to meet with the Colts. He left without a deal and, according to the Indianapolis Star, an offer to Hankins from the Colts is unlikely.

So, where does that leave Hankins? The offer from the Giants essentially is identical to the contract Nick Fairley signed with the Saints. The market for defensive tackles this year produced only one break-the-bank deal: Brandon Williams’ five-year, $52.25 million haul to re-sign with the Ravens. Established veterans such as Dontari Poe (Falcons) and Bennie Logan (Chiefs) had to settle for one-year, $8 million contracts.

Hankins is only 25 years old and, if he accepts the offer to stay with the Giants, he could become a free agent again at 29. It certainly looks as if Hankins’ agent, Kevin Poston, misread the market. A source said the first contract sought from Hankins’ camp was for $15 million per year, a ridiculous demand that quickly dropped to $10 million per year — more on average than the five-year, $46.25 million deal Damon “Snacks’’ Harrison got from the Giants a year ago. Harrison is considered the best run-stopping defensive tackle in the league. The Giants value Hankins and see him as a bona fide starter, but they do not view him as a difference-maker in the mold of Harrison.

With the Colts visit behind him, perhaps Hankins will redirect his thoughts and come back to the Giants. It is possible a team will offer him a one-year deal. The Giants do not appear to be that team, though.

“You like it here, they treated you well, you had an injury, the doctors took care of you,’’ the source said of Hankins’ relationship with the Giants. “They have a winning team, got something going. I mean, at what point, c’mon now, I don’t get it.’’

With the NFL draft starting April 27, Hankins runs the risk of seeing the Giants possibly use a high pick on a defensive tackle, which could prompt them to pull their offer.