2026 Bush-Whacker® Flex-Wing Cutters ST-120

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Year 2026
Make Bush-Whacker®
Model Flex-Wing Cutters

ST-120 Heavy-Duty delivers serious flex-wing performance in a compact 10-foot package. Designed for commercial mowing and property maintenance, it features a reinforced deck and heavy-duty driveline built for tough, continuous use. The flex-wing design follows uneven terrain for a consistent cut, while robust gearboxes provide reliable power for cutting grass and brush up to 4” in diameter. Durable axles, solid rubber tires, and hydraulic wing lift complete a dependable, easy-to-operate solution for demanding mowing conditions

Features may include:

Heavy-duty 3/8" side skirt with full-length skid shoes

Rated to cut up to 4' diameter brush.

Hinges 3" x 4" tubing with grease fittings.

Hinges – Structural tubing with grease fittings.

8-bolt mounting on gearboxes – bolt-heads are tack-welded to bottom of deck so one person can tighten the nuts or change the gearbox.

Drivetrain

Gearbox Divider: 275 hp | Spindle: 250 hp | 540 rpm or 1,000 rpm

Gear Ratio (Primary) 1:1.6

Drive Shaft Category 6, Category 5 intermediate, and wing drive shafts.

Clutch Slip: Two heavy-duty clutches with spring type adjustment and four friction discs.

Wheels & Tires

Tires, Rear Specification Laminated | Five solid rubber tires standard. Independent shock absorbing system for all-wheel axles.

Operational

Operating Speed Bladetip: 16,768 FPM

Chassis

Deck Thickness 7 Gauge / 12 Gauge

Dimensions

Dimensions Cutting Capacity: 4"| Side Skirt Thickness: 3/8" | Blade Size: 1/2" x 4" | Blade Overlap: 8" | 20 splined 1 3/4″ input shaft, 2 3/8″ output shaft

Height Cutting: 2"-15" | For aircraft and implement tires: 2″ to 17″.

Cutting Width 10'

Overall Width 140"

Overall Length 167"

Transport Width 88'

Weights

Weight Approximately: 4,600 lbs

Features

Features Safety Deflectors: Chain Guards | Blades: Free swinging when encountering obstructions.

Construction Material Blades – 1/2" by 4" material, alloy spring steel, airlift design.

Adjustability Hydraulic Adjustments: Hydraulic lift cylinders control raising and lowering of a flexible wing. Wing may be raised to 88 degrees above horizontal and lowered to 22 degrees below the horizontal cutting plane.

Warranty

Warranty Mower: 1 Year Limited | Gearbox: 5 Year Limited

2026 Bush-Whacker® Flex-Wing Cutters ST-120