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Daniel is right. If you tighten the knurled ring by hand, but not quite as hard as it will go, then use a large spanner to tighten the locknut down against it, which will tighten the race slightly more, you won't need any sort of pliers (or, less likely to damage anything, a strap wrench). You might need to back off and try again a few times to get the load ...

I'll add that anything hand tight will come loose fairly soon. As the knurled race loosens it will start to damage itself an/or the ball bearings and cause sloppy handling and steering. I'm not saying that you want to torque the race down to the fork, but up against the lock nut as @alex suggests: Then whilst holding the locknut still with a spanner, ...

I believe this style is meant to be tightened by hand. To tighten, start by tightening the knurled/textured upper race a little harder than you intend it to be once you're done. Next, add the washer and screw on the locknut as hard as you can without tightening the race any more than it already is. Too tight and you may damage the races and need a new ...