I believe their ability to nuke other nations would depend on their ability to hurl them far.
The doctrine behind the Samson Option seems to be aimed at keeping their more local neighbors at bay, since those states are the ones which they have historically had conflicts, aiming to assure them that if they somehow collapse Israel, they're going down as well. In the past they've claimed they'll "wipe out everything
," but they, even at their hypothetical best, couldn't come close to hitting everyone
with any significant impact.
Their speculated inventory of nuclear weapons is posited to be anywhere from 50-400, with most purportedly in the tactical, or at least sub-megaton, yields. Their known delivery systems (Jericho 2 and 3 missiles) don't even exceed a maximum possible speculative
range of over 11000km, but without carrying the max payload of around 1000kg.
So, they can reach out and touch most of their immediate area, however, if, say... China wanted to start lobbing shit at them, they'd be hard-pressed to send anything significant to Beijing in reply. That is, unless they truly have a secret ICBM program that is competitive with the top performers in that area, which would in turn be very expensive, and relatively impractical overkill, given that most of their enemies are A-rabs in the regions within a few thousand kms of Jewistan.
Also, it ought to be noted that the Israelis view the Samson Option as not limited to nuclear responses. Israel have chemical weapons capabilities, and they've been accidentally exposed a couple of times importing materials useful for pretty much only chemical weapons, though of course the extent to which they have built their arsenal is speculative.
Speculation and rumor work well for them, as it keeps everyone guessing, and likely the numbers are on the low end of the estimates you'll find, because why have a fuckton of weapons, if you can just pay for a handful, and let everyone think
you have 400 nukes, ready to roll?