The Gravely / Ariens locking top flange nut (part number 06543100) is a genuine OEM fastener used across a wide range of mower assemblies. With a .31-18 thread size, this nut is designed to secure bolts in high-vibration areas such as deck mounts, frame brackets, and engine supports.

Its integrated flange distributes load evenly and reduces the need for washers, while the locking feature helps prevent loosening during operation. Made from corrosion-resistant steel and zinc-coated for durability, it’s suitable for both residential and commercial-grade machines.

This part has been superseded by 06500904 but remains widely used in Ariens and Gravely equipment including Zoom, ZT XL, Pro-Turn, and Snowblower models. Using OEM hardware ensures proper fitment and long-term reliability.

Fits:

• Ariens Zoom, ZT XL, Snowblower Attachments
• Gravely Pro-Turn, ZT HD, Compact-Pro
• Various mower deck and frame assemblies

Technical Specifications:
OEM Part Number: 06543100
Thread Size: .31-18 (5/16″-18 UNC)
Type: Locking Top Flange Nut
Material: Zinc-coated steel
Replaces: 06500904