72mm UV Lens Filter - HD MCUV Scratch-Resistant Ultraviolet Protection Filters

SKU: KF01.987

A
Yes it is threaded on the front side. 
A
If it is the correct size. I have a K&F on my 70-200mm f4 L IS USM (67mm) 
A
In addition to lens protection I specially like the K&F design with CNC precision-curved anti-slip teeth on the rim. If your Tamron lens cap is all smooth and not the centre-pinch snap on type then I don't think it will fit because of the corrugated teeth.