Are these very small hitches normal in games?

[Akosjun]

I've had this PC of mine for quite a while now, and I've been wondering if the stutter I experience in certain games is normal or not.

The stutters are very small (really just a split second), barely noticable, but noticable. Their frequency varies game by game, in The Witcher 3, they occur every 20-30 minutes or sometimes when fighting multiple enemies. In Burnout Paradise, they appear every 10 minutes. In BioShock infinite, they only happen at certain locations (although I think these are common in Unreal Engine games). Once in a while they occur in Rise of the Tomb Raider too. There are some more games where this occasional stutter is present, but in all other games (e.g. GTA 5, Project CARS, old games) there is no stutter whatsoever. 

During gaming, the hardware usage is fine (usage isn't constanty 100% on anything, it's about how it is in the benchmarks). When a stutter happens, the frame time obviously jumps up for a moment and then gets back to normal.

My Specs:
• Intel Core i7-4790 3.6 GHz
• NVidia GTX 1060 6 GB
• 2×8 GB HyperX FURY RAM sticks, 1866 MHz, DDR3
• 1 TB 7200 rpm HDD and 500 GB SSD (most games are installed on the SSD)
• 450 watt Corsair PSU
• Windows 10 64-bit
I don't use any antiviruses and all my drivers are up to date.

Is this a normal occurence on all systems or is something off with mine?