Assault Industries Polaris RZR RS1 Phoenix Axles (2018-2021)
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Assault Industries MAS-223 Phoenix Axles are stock-length front and rear replacement axles for the 2018-2021 Polaris RZR RS1. They pair heat-treated 4340 chromoly shafts, larger than stock, with Assault's proprietary high-temp grease, which showed no breakdown at 586.4°F in lab testing.
Choose Front or Rear. Each axle is sold individually.
These RZR RS1 axles suit the single-seat machine's hard-charging use. Choose the RS1 front axle or the RZR RS1 rear axle; each RZR RS1 axle is sold on its own. Shoppers comparing Polaris RS1 axles, RS1 axles or Polaris RZR RS1 axles will find these RZR RS1 heavy duty axles are the Phoenix axles Assault builds around its high-temp grease, the Assault Industries Phoenix axle for the RS1.
Key Features
- Proprietary high-temp grease blend, virtually waterproof
- Grease resists temperatures above 586.4°F (308°C)
- Reduced friction prevents heat buildup
- High pressure tolerance for extreme rides
- Heat-treated 4340 chromoly shafts, larger than stock
- Operates at high CV angles
- Field and lab tested; 3-year warranty
Built To Solve: Overheated CVs on a Polaris RZR RS1
- CV joints failing when stock grease overheats
- Boot and CV failures after long, fast pulls
- Stock shafts bending on rocks and logs
- Replacing a broken axle with another stock part
Best For: 2018-2021 Polaris RZR RS1 Owners
- 2018-2021 RZR RS1 owners
- Single-seat dune and trail riders
- Riders who run at speed and full articulation
- Owners replacing a front or rear axle
Specifications
- Brand: Assault Industries
- Product line: MAS-223 Phoenix Axle
- Shaft: heat-treated 4340 chromoly steel, larger than stock
- Grease: proprietary high-temp blend, tested to 586.4°F (308°C)
- Warranty: 3 years
- Length: stock
- Positions: front, rear
- Sold: individually
- Manufacturer Part Number (front): AXRS01-005F0#AB
- Manufacturer Part Number (rear): AXRS01-002R0#AC
Fitment
- Polaris RZR RS1: 2018-2021
Replaces OEM front 1333434, 1334492 and rear 1333124, 1333439, 1333718, 1333944, 1334307, 1334490. Fitment is not guaranteed on applications not listed above; confirm your year, model and cab before ordering.
FAQ
Are front and rear the same part?
No. The front (AXRS01-005F0#AB) and rear (AXRS01-002R0#AC) are different axles, sold individually.
Which years do they fit?
SuperATV lists the 2018-2021 Polaris RZR RS1.
Which OEM part numbers do they replace?
SuperATV lists front 1333434, 1334492 and rear 1333124, 1333439, 1333718, 1333944, 1334307, 1334490.
What makes the Phoenix grease different?
Assault Industries uses a proprietary high-temp grease blend that is virtually waterproof. In lab testing it showed no breakdown at 586.4°F (308°C), the limit of the test equipment, while OEM grease broke down at 365°F.
How do they compare to SuperATV Rhino 2.0 axles?
Both use heat-treated 4340 chromoly. The Phoenix Axle adds Assault's high-temp grease and a 3-year warranty, versus 18 months on Rhino 2.0; Rhino 2.0 costs less. See our Rhino 2.0 listing for the RZR RS1.
What warranty do they carry?
Assault Industries backs MAS-223 Phoenix Axles with a 3-year warranty.
Why Assault Industries
Assault Industries built the MAS-223 Phoenix Axle around its own high-temperature grease. In Assault's viscosity lab testing the grease showed no breakdown at 586.4°F, where the test equipment maxed out; OEM grease broke down at 365°F. Every MAS-223 Phoenix Axle is backed by a 3-year warranty.
Complete Your RZR RS1 Driveline
When one RS1 axle fails, the others have usually seen the same heat and abuse, so decide which positions you need. Confirm your model, year and option against the fitment list.
