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SHORING WITH THE ELLIS SCREW JACK IS SIMPLE Use the SJ-4 or SJ-4G with any length nominal 4x4 Insert lumber into the screw jack Adjust up to 6" for temporary or secondary permanent use Tighten safety set screw with 6mm allen wrench to lock in the height of the screw jack SJ-4 SJ-6 MJ-6 STL-37 STL-55HD Add to Cart Add to Cart Add to Cart Add to Cart Add to Cart Customer Reviews 4.8 out of 5 stars 115 4.8 out of 5 stars 115 4.7 out of 5 stars 105 4.6 out of 5 stars 108 4.7 out of 5 stars 33 Price $172.36$172.36 $239.42$239.42 $166.49$166.49 $299.94$299.94 $885.19$885.19 Range of Adjustment 6" 6" 9.5"-15" 37"-61" 55"-80" Safe Load Capacity (Fully Extended) Up to 15,000 lbs Up to 30,000 lbs 15,000 lbs 12,000 lbs 34,000 lbs Factor of Safety Applied to the Failure Load 2.5/1 2.5/1 2.5/1 2.5/1 2.5/1 Acme Screw Size 1-1/4" 1-3/4" 1-1/4" 1-7/8" 2-7/8" Weight 12 lbs 22 lbs 11 lbs 31 lbs 72 lbs Finish Powder Coated Powder Coated Powder Coated Powder Coated Powder Coated Material High Carbon Steel High Carbon Steel High Carbon Steel High Carbon Steel High Carbon Steel
HEAVY-DUTY LEVELING JACK FOR 4X4 POSTS - Designed to support up to 15,000 lbs, this steel screw jack stabilizes beams, levels joists, and reinforces crawl spaces. Built for demanding structural repairs, it offers strength, stability, and durability for residential and commercial applications.
ADJUSTABLE & VERSATILE SUPPORT - Easily attaches to 4x4 nominal lumber with a 6-inch adjustment range for precise leveling. Functions like a lally column for structural reinforcement, making it ideal for trench shoring, construction, and foundation repair projects.
SECURE & DURABLE CONSTRUCTION - Made from high-carbon steel with a corrosion-resistant finish, this 4x4 jack ensures long-term stability in extreme conditions. A built-in safety lock provides extra security, making it suitable for both permanent and temporary support.
PRODUCT SPECS & MATERIALS - Weighs 12 lbs with a max load capacity of 15,000 lbs. Features a 6-inch adjustment range using a 1.25-inch Acme threaded screw, independent swivel base plates with 4-5/16" diameter holes, and a lock-set screw for stable, long-term support.
TRUSTED QUALITY SINCE 1951 - Ellis Manufacturing Company has provided industry-leading structural support solutions for over 70 years. Renowned for durable construction materials and superior craftsmanship, Ellis is a trusted name in shoring and foundation repair.
