Do you want a tight knot to the eye or a loose loop for fly action? For a loop knot I've used the 'no-name' knot for monos up to 300# test & down to 10# test. It is a small knot and can be 'un-done' quickly to change flies. For tight knots up to 80# test I like an improved clinch. Above that depends on th size of the hook eye and wire.