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Adjustable Floor Jack Posts, 21″–43″ Height Range, 11,023 lbs Max Load, Heavy-Duty Steel House Jacks for Leveling & Structural Support, 2 Pack

$79.99

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Description

The 21–43 inch adjustable floor jack post (2-pack) is a carbon-steel structural support system engineered with a 11,023 lbs load capacity per post. Featuring a dual-stage height adjustment mechanism (telescoping inner tube + precision threaded screw collar), it accommodates vertical clearances from 21 to 43 inches in basements, taller crawl spaces, and subfloor beam structures.

Key Features & Structural Highlights

  • 11,023 LBS HEAVY-DUTY LOAD CAPACITY: Built from high-tensile carbon steel, each support post safely bears up to 11,023 lbs of vertical weight, offering reliable lifting and supplemental support for sagging floor joists and load-bearing beams.
  • 21–43 INCH EXTENDED ADJUSTABLE RANGE: Engineered specifically for medium-to-tall clearance gaps (21 to 43 inches) beneath beams and joists where low-profile short jack posts cannot reach.
  • DUAL-STAGE ADJUSTMENT SYSTEM: Combines a telescoping inner tube for quick rough-height positioning with a fine-tuning screw collar for millimeter-precise, flush contact against supported members.
  • HEAVY-GAUGE STEEL BODY & PLATES: Features thick steel top support and base plates that transfer vertical forces evenly to prepared concrete footings, preventing slippage under load.
  • VALUE 2-PACK FOR BALANCED STABILITY: Includes two complete jack posts to distribute structural weight across multiple points along sagging beams or long joist spans.

Looking for a Different Height Range?

Need a lower profile for tight crawl spaces? Explore our complete line of Adjustable House Jacks for Leveling:

Heavy-Duty Structural Support for Basements

Sagging subfloors, sticking doors, and beam deflection are common signs of settling foundations or compromised structural joists. The 21–43 Inch Adjustable Floor Jack Posts (2-Pack) provide a heavy-duty, high-capacity solution engineered for temporary structural support and precise floor leveling during home renovation, maintenance, and foundation repairs. For a comprehensive walkthrough on diagnostic signs, check out our guide on how to level a sagging floor with screw jacks.

Dual-Stage Height Fine-Tuning Mechanism

Unlike single-screw jacks that require exhausting manual threading over long distances, this post utilizes an efficient two-stage elevation process:

  1. Telescoping Stage (Rough Height): Lift the telescoping inner steel post to bring the top support plate close to the beam clearance height.
  2. Screw Thread Stage (Fine Adjustment): Rotate the threaded screw collar to micro-adjust the top plate upward until it makes full, flat contact with the lower edge of the beam.

11,023 lbs Certified Load Transfer

Constructed from high-strength carbon steel, each jack post is rated to support up to 11,023 lbs. Wide upper support and bottom base plates maximize surface contact area, reducing pressure points and transferring weight safely onto a prepared concrete footing.

Technical Specifications

Technical Attribute Parameter / Specification
Rated Load Capacity 11,023 lbs (5,000 kg) / unit
Adjustable Height Range 21 in to 43 in (53.3 cm to 109.2 cm)
Adjustment Mechanism Dual-Stage (Telescoping Post + Precision Threaded Screw)
Material Composition Heavy-Gauge High-Strength Carbon Steel
Package Quantity 2-Pack (Includes 2 complete floor jack posts)
Primary Applications Basements, Tall Crawl Spaces, Floor Joists, Beam Leveling
Required Footing Type Flat, Level, Load-Bearing Concrete Footing

How to Measure & Install Floor Jack Posts

Follow these steps to ensure proper installation and vertical load alignment:

  1. Measure Vertical Clearance: Measure the exact vertical distance between your concrete footing and the bottom of the supported beam. Verify that the required reach is between 21 and 43 inches.
  2. Prepare a Solid Base: Position the jack post on a clean, solid, level concrete footing. Never place posts directly on soil, dirt, or soft surfaces.
  3. Set Telescoping Height: Extend the inner post close to the beam height and lock the positioning pin.
  4. Fine-Tune the Top Plate: Turn the threaded screw collar clockwise until the top steel plate fits flush and tight against the beam.
  5. Inspect Alignment: Ensure the jack post is perfectly vertical and plumb before transferring full structural weight.

Disclaimer: These posts are designed for temporary or supplemental structural support. Consult a licensed contractor or structural engineer for permanent foundation modification or structural lifting.

FAQ

Q1: What is the weight capacity of these 21–43 inch floor jack posts?

A: Each jack post features a rated load capacity of up to 11,023 lbs, providing robust vertical support for sagging floor joists, beams, and subfloors.

Q2: What is the main difference between a 21–43 inch jack post and shorter models?

A: The 21–43 inch post is designed for taller clearance applications—such as basements, deep subfloors, and elevated decking beams—where shorter 12–22 inch or 17–31 inch jacks are too short to span the vertical gap without extra wood blocking.

Q3: Why is this floor jack post sold in a 2-Pack?

A: Structural beam leveling usually requires multi-point support. Providing two jack posts allows users to distribute weight evenly across sagging joists, preventing single-point stress and ensuring balanced lifting.

Q4: Can these floor jack posts be used on dirt floors in a crawl space?

A: No. Jack posts must always be installed on a firm, level, load-bearing concrete footing. Installing posts on soil or soft ground can cause sinking, tipping, and structural failure.

Additional information

Weight 17 lbs
Dimensions 12 × 10 × 36 in

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