The Heavy Hitter Arctic XE Pro Rear Axle Bolt Upgrade 300M Steel is a direct-fit replacement for the stock rear axle on the Arctic Leopard XE Pro, Enduro, S, R and MX, made by Heavy Hitter and sold here at GritShift. Aerospace-grade 300M steel, nitride hardened, 15 mm diameter at the stock length, nut included, 2 lb, no modification required.
Specs verified October 2026 against the live GritShift product page.
Specifications
| Material | 300M steel, aerospace-grade |
|---|---|
| Surface treatment | Nitride hardened for corrosion resistance |
| Diameter | 15 mm, matches stock |
| Length | Same as stock |
| Hardware | Nut included (bolt and nut) |
| Weight | 2 lb |
| Replaces | The stock rear axle on the Arctic Leopard XE platform |
| Modification | None required |
What bikes does the Heavy Hitter 300M rear axle bolt fit?
- Arctic Leopard XE Pro
- Arctic Leopard XE Pro Enduro
- Arctic Leopard XE Pro S
- Arctic Leopard XE Pro R
- Arctic Leopard XE Pro MX
Why upgrade the XE Pro rear axle to 300M?
Heavy Hitter calls the stock rear axle a known weak point in the XE Pro drivetrain. Stock axle bolts are standard-grade steel and they bend under hard riding, even at 15 mm. The Heavy Hitter bolt matches the stock dimensions exactly, 15 mm diameter and the same length, so there is no modification and nothing about your setup changes, but 300M is an ultra-high-strength alloy used in aerospace and motorsport applications where failure is not an option. Heavy Hitter sums up the trade as significantly stronger, same fit, longer service life.
Why is the 300M axle bolt nitride hardened?
300M is more reactive than standard steel by nature, so Heavy Hitter adds a nitride hardening process. That surface layer resists rust and corrosion, which is the one weakness the alloy would otherwise bring to an axle, and it is why Heavy Hitter considers the combination worth it: the strength of 300M without the corrosion penalty.
Does the rear axle bolt come with a nut?
Yes. The product page states that the nut and bolt are included, so you do not reuse the stock nut. Heavy Hitter makes the rest of the XE Pro pivot hardware in the same nitride hardened 300M: the Arctic XE Pro Swingarm Bolt 300M and the Arctic XE Pro Linkage / Triangle / Shock Bolt Upgrade Kit 300M.
Where can I buy the Heavy Hitter Arctic XE Pro Rear Axle Bolt Upgrade 300M Steel?
Right here. We sell the Heavy Hitter Arctic XE Pro Rear Axle Bolt Upgrade 300M Steel at GritShift, made by Heavy Hitter. Browse every Heavy Hitter part we carry in our Heavy Hitter collection.
