3309 Series Sonic Hub (8mm Bore)

Competition eligibility

Legal for FIRST Tech Challenge (FTC) and FIRST Robotics Competition (FRC). Eligibility is set by each season's game manual — check the current rules before you compete.

Sonic Hubs are more balanced than even set screw hubs (and with just as much clearance). Make them your go-to hub for high speed applications leaving behind concerns about marred shafts or lost set screws. The pattern to fasten components to, and the clamping mechanism to hold the hub onto a shaft, are completely isolated from one another. This means you can tighten the dual pinch bolts to clamp down on a shaft and you haven't distorted the holes you need to use for mounting components to the hub. Likewise, you can fasten the hub to a gear, sprocket, pulley or wheel prior to tightening onto a shaft since the clamping mechanism is able to function regardless of what the hub is connected to. Since the Sonic Hub clamping mechanism is pulled in toward the center, the hub can fit in recesses and clear where a 3301 Series Clamping Hub cannot.These Sonic Hubs have threaded holes on the 16mm pattern so that thru-hole parts can easily attach using M4 screws. The two pinch bolts offer excellent clamping force in a compact form-factor.The 8mm round bore Sonic Hub can be used on 8mm round shafting, 8mm OD standoffs and spacers and even 8mm D-shaft. There are some use cases where you need to clamp onto something other than a d-shaft, or, maybe you want to clamp onto a d-shaft while retaining the freedom to clock your hub independent of the location of the flat on the shaft. As with all Sonic Hubs, this hub is balanced and possesses two pinch bolts to maximize the clamping force while maintaining a slim profile.

size:8mm Bore

Technical drawing