Description
The FOX® 981-20-043 Factory Race 2.0 x 4.0 Bump Stop with Pinch Mount is a stand-alone, nitrogen-adjustable bump stop featuring a 1-1/4in. hard chrome plated 4130 chromoly steel shaft, a top Pinch mount, 14.19in. extended length, and 10.15in. compressed length for precise control of the last inches of suspension travel. This is a universal, application-independent component intended for custom off-road builds and race applications rather than a specific vehicle platform.
IMPORTANT: This bump stop is equipped with a top Pinch mount and no bottom mount bracket (Bottom Mount: None) — verify your chassis or shock mounting interface uses a pinch-style upper mount before purchasing, as no lower mounting hardware is included. This is a stand-alone Factory Race Series bump stop only; it does not include a shock body, coilover, or reservoir. The built-in FOX Air Valve (FAV) requires a nitrogen charging station to adjust bottoming control — this is not a user-serviceable air/oil spring shock and should be charged with nitrogen only.
FOX® Factory Race Series bump stops were developed alongside top off-road racing teams to provide precise control of the last few inches of suspension travel, allowing the full range of suspension travel to be used without harsh bottoming. As a stand-alone component, this bump stop can be integrated into custom suspension setups where a dedicated, tunable bottoming control device is needed.
The built-in FOX Air Valve (FAV) allows precise nitrogen charge adjustments, giving builders a wide range of bottoming control to match spring rate, travel, and driving style. The durable construction and replaceable strike pad are built to withstand repeated high-speed impacts while providing predictable, quiet operation.
Construction includes a hard chrome plated 4130 chromoly steel shaft, Black Anodized CNC machined aluminum components, and a new proprietary Cerakote® protective ceramic coating over a zinc-plated basecoat for corrosion resistance. The unit is owner serviceable and rebuildable, and is charged with JM92 MIL-SPEC oil developed specifically for off-road racing. Covered by FOX’s standard suspension product warranty.
- Stand-alone bump stop: 1-1/4in. chromoly shaft, Pinch top mount, no bottom mount bracket, 14.19in. extended / 10.15in. compressed length
- Nitrogen-adjustable FOX Air Valve (FAV) for tunable bottoming control
- Hard chrome plated 4130 chromoly steel shaft
- Black Anodized CNC machined aluminum components
- New proprietary Cerakote® protective ceramic coating over zinc-plated basecoat
- Owner serviceable and rebuildable; replaceable strike pad
- Charged with JM92 MIL-SPEC oil developed for off-road racing
- Requires a nitrogen charging station for FAV adjustment (not included)
- Covered by FOX suspension product warranty
- Sold individually
| Part Number | 981-20-043 |
| Series | Factory Race |
| Body Size | 2.0 x 4.0 |
| Shaft Diameter | 1-1/4in. |
| Shaft Material | Hard chrome plated 4130 chromoly steel |
| Travel | 4in. |
| Extended Length | 14.19in. |
| Compressed Length | 10.15in. |
| Top Mount | Pinch |
| Bottom Mount | None |
| Body Plating | FOX Grey Cerakote |
| Seal Kit Part Number | 803-04-038 |
| What’s Included | (1) FOX Factory Race 2.0 x 4.0 Bump Stop, Pinch Mount |
This is a universal, stand-alone bump stop suited for custom off-road and race suspension builds rather than a specific factory vehicle platform — key application specs are a 1-1/4in. chromoly shaft, a Pinch-style top mount, no bottom mount bracket, and 14.19in. extended / 10.15in. compressed travel length. Confirm your mounting hardware, shaft diameter, and travel length requirements match this configuration before purchasing, as FOX offers other Factory Race bump stops in different lengths and mount configurations that are not interchangeable with this SKU.