BudsGunShop.com - tikka T1 17hmr

Jack, Yes the Tikka T1 17hmr has the Barrel Thread Pitch: 1/2" x 28 TPI to accommodate any matching muzzle device.

Yes it does
" found on the rifle is a threaded muzzle, enabling hunters and shooters to pair up suppressors or other muzzle devices to their gun."
brownells.com/firearms/rifles/bolt-action/t1x-17-hmr-20-bl-syn-10-1-threaded-prod117477.aspx
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rifleshootermagazine.co.uk/gun-tests/detailed-test-and-review-of-the-tikka-t1x-mtr-in-17-22-rimfire-1-5853079

Jack, yes Sir it is Threaded. Cheers and stay safe!