Honda Z50 Grade 10.9 Shouldered Sprocket-to-Hub Stud & Nut Kit

Grade 10.9 Shouldered Sprocket Stud & Nut Kit — Honda Z50

Your rear sprocket takes constant abuse — throttle hits, engine braking, chain shock, and vibration. This Grade 10.9 shouldered stud kit is built specifically for the Honda Z50 sprocket-to-hub mounting so your hardware isn’t the weak link.

Unlike fully threaded bolts, these studs feature a precision non-threaded shoulder that passes through the sprocket stack. That smooth shank carries the shear load instead of the threads — exactly how a high-stress rotating assembly should be supported.

When properly torqued, the sprocket is held by clamp force between the hub and sprocket — not by the fastener itself. The shouldered design ensures that if shock load is transferred into the hardware, it’s supported by the solid shank, not thread peaks.

On tight-clearance bikes like the CT70 and Z50, this also adds a layer of protection. If a bolt loosens, the entire fastener can begin backing out. We’ve seen this result in bolts contacting — and even tearing through — a swingarm.

In a stud configuration, a properly seated stud installed with red threadlocker remains fixed in the hub, and only the nut is responsible for clamp load. Even if a nut were to loosen, the stud itself is far less likely to back out far enough to cause contact or damage.

Features

• Grade 10.9 high-tensile steel
• Precision shouldered (partially threaded) design
• Smooth shank spans the sprocket shear zone
• Reduces thread fatigue and stretching under load
• Matched nuts included — no mix-and-match hardware
• Designed for Honda Z50 rear sprocket-to-hub mounting

Fitment Note

This kit is tested and confirmed to work with our Z50 reproduction hub and our CT70–Z50 conversion hub. Fitment with OEM Honda hubs or other aftermarket hubs we do not carry is not guaranteed.

If you’re running more than stock power — or you just build things the right way — this is the hardware your hub deserves.

Built for bikes that actually get ridden.