Andersen 4" Trailer Jack Block | 3684 | 9" Magnetic Jack Pad | Red

Get solid, no-slip footing under your stabilizers in a low-profile package with the Andersen 3684 4" Trailer Jack Block. Built-in magnets snap the block onto the jack pad so it travels with the jack, and the 4" height gives just enough lift to keep jacks off soft ground and out of their fully extended, weakest range.

⚠️ Load Ratings

• Single block: 30,000 lb
• Double-stacked: 20,000 lb

Do not stack more than two.

4" vs. 8" — Which Block?

The 3684 is the compact 4" version — ideal for fifth wheel landing gear, leveling systems with round feet, and any jack where an 8" block would over-extend the frame. If you need more height under scissor or post jacks, see the 8" Andersen 3608 Trailer Jack Block.

Key Features

• Magnetic locking — snaps onto jack pads up to 9" round
• 4" height for optimal lift without over-extending jacks
• 30,000 lb single-block rating
• Heavy-duty plastic — resists dirt and oil
• Made in the USA
• Lifetime warranty on plastic components

Specifications

• Brand: Andersen Hitches
• Part Number: 3684
• Type: Magnetic Trailer Jack Block
• Height: 4"
• Fits: Jack pads up to 9" round
• Capacity: 30,000 lb single; 20,000 lb double-stacked
• Color: Red
• Quantity: 1