15873 Spindle for BAD BOY: 037-8000-00, 037-4000-00, 037-4000-50, 038-4000-50

Key Features

• Direct Aftermarket Replacement: Precision engineered by Rotary to meet or exceed OEM specifications for fitment and performance.

• Heavy-Duty Cast Iron Housing: Solid cast iron construction provides massive strength and resists cracking from rock impacts and heavy vibrations.

• Fully Assembled: Comes complete with the housing, shaft, and pre-installed high-speed bearings (uses bearing 50191 / 037-6023-00).

• Smooth Operation: Ensures consistent, level blade rotation to eliminate deck vibration and prevent uneven cuts.

Specifications

• Rotary Part Number: 15873 (Also crosses to Stens 285-917)

• Housing Material: Cast Iron

• Replaces Bad Boy OEM Part Numbers:

  • 037-4000-00

  • 037-4000-50

  • 037-8000-00

  • 038-4000-50

Fits the Following Bad Boy Models:

• Outlaw, Outlaw Extreme, and Outlaw XP: (2012–2017 models with 54″, 61″, and 72″ Decks)

• Outlaw Stand-On: (With 48″, 54″, and 61″ Decks)

(Note: Please verify your mower’s deck size, year, and required original part number prior to purchase to ensure proper fitment. Mounting hardware and pulley are typically reused from your original assembly unless otherwise noted).