Will these fit my stock wheels?

These are M12 x 1.5 standard thread — they'll screw onto factory studs. The 50mm length is designed for deeper wheels, so if your wheels have shallow seat design, check fitment in the wheel center before fully seating. Test one nut first.

Do I need to torque these differently than factory lug nuts?

Torque spec stays the same as your vehicle's factory spec — refer to your service manual. Aluminum conducts heat differently than steel, so don't over-tighten. Hand-tight plus a quarter turn with a wrench works for most builds.

Will the purple color fade or chip off?

Anodized finish is baked into the aluminum, not a paint coat. It'll resist fading and corrosion, but you can expect light wear where the wheel seat contacts the nut head over time — that's normal. The purple will stay vibrant longer than painted lugs.