The NightWing AR500 Disc The FingerTech NightWing AR500 disc is the standard weapon included with the FingerTech NightWing Kit — and it’s not subtle. Cut from AR500 abrasion-resistant steel, the same material used in full-sized 250lb BattleBots™ weapons, this 10in four-toothed disc is engineered to deliver maximum punishment in the 3lb class. Paired with the NightWing’s belt-driven weapon system, it spins up to 8,000 RPM on a 3S LiPo — that’s 240mph at the tips. You can also check out our new Nightwing titanium disc! AR500 Steel — Why It Matters AR500 is a hardened abrasion-resistant steel with exceptional toughness and edge retention. It doesn’t deform on impact the way mild steel does — it bites, bounces back, and stays sharp. For a 3lb undercutter weapon disc spinning at this speed, that material choice isn’t a luxury, it’s the point. This is the same spec that makes full-sized combat robot weapons so destructive, scaled down to beetleweight class. Four Teeth, Optimized The disc’s four-tooth geometry isn’t arbitrary. Tooth rake and relief angles have been optimized by FingerTech for the ideal balance of bite and durability — aggressive enough to catch and launch opponents, tough enough to survive the hits that come back. The undercutter profile keeps the disc low to the ground, sneaking under opponents’ armor where it does the most damage. Compatible Mounting Options The disc includes a 4-hole screw and slot pattern that works with the FingerTech Blade Mount, the FingerTech 60T Weapon Pulley, or your own custom hub — so if you’re building a custom undercutter chassis around this weapon system, you’ve got options. Stock a Spare Combat discs take hits — that’s their job. AR500 is tough, but a bad impact can nick a tooth or bend a disc beyond reliable use. If you’re competing with a NightWing, having a spare FingerTech NightWing AR500 disc in your pit bag isn’t paranoia, it’s standard practice. Pair it with a spare FingerTech 67T Timing Belt and a FingerTech Safety Clamp and you’re ready for whatever the arena throws at you. Safety Warning: Spinning weapons generate extreme kinetic energy. Always engage a weapon lock and test only within a secure arena or test box. Never operate a spinning weapon in an unsecured area. ItGresa Combat Robotics Safety Guide FingerTech Combat Robot Safety Guide FingerTech Test Box Build Instructions (PDF)
