Bookshelf Speakers That Bolt or Screw Into Stands

The Revel M-20s have threaded inserts for bolting them to the Revel stands. I did not have the Revel stands so I bought some 1/4 inch thick plexiglass pieces to bolt them to my stands. I had to first drill holes in the plexiglass to match my stands, then drill holes in the plexiglass that mated to the Revels. The threaded holes on the Revels were outside the stand's platform so it worked very well.
The M-20s are excellent speakers BTW.

Usher monitors can be locked down on their stands

Soliloquy 5.0
Discontinued, but good value & good looking

If you can find them, the original:
Avalon Monitors

These were made in solid walnut in the late 90's (?), not the same speaker that Avalon markets as their current Avalon Monitor now. They have the same front baffling as all Avalon models. They are very rare, as they were somwhere around $4 or $5K in their day. They sounded great, sound-staged wonderfully and bolted into stands that were specifically designed for these monitors. Their port fired downward rather than from the back of the cabinet, so they had the ability to be placed close to walls.

PSB Platinum M2s are designed to bolt to dedicated stands and are excellent speakers that some dealers still have at blow out prices.