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RD Series Double-Acting Cylinder, 55 / 28 Ton (Push/Pull), Inch Rod, Inch Stroke

Description & Features

The RD Series Double-Acting Cylinder provides up to 55 tons of pushing force and 28 tons of pulling force for demanding applications in bridge lifting, building reconstruction, and equipment maintenance.

Featuring aluminum bronze overlay bearings for extended life and a chrome-plated piston rod for corrosion resistance, this SPX Hydraulic Technologies cylinder is built for durability. A load cap with a grooved ring pattern helps prevent load slippage. It also features mounting holes and collar threads for versatile attachment.

SKU: RD556

Supplier Part Number (MPN): RD556

Alternate Part Numbers: C1JQ54

Specifications

Capacity (tons) 55 / 28	Cylinder Effective Area (sq in) 11.04 / 5.63	Brand HYDRAULIC TECH USA LLC(SPX)	Brand Hydraulic Tech USA	Pack Size 1.00	UOM EA	Extended Height 19.22	Alternate Part Numbers Alternate Part Number C1JQ54	Supplier Part Number RD556	Product Weight 61.40 lbs

Similar Products

Model Number	Capacity (tons)	Stroke	Oil Capacity	Retracted Height	Extended Height	Thread 1	Piston Rod Diameter H	Thread 2	Cylinder Effective Area (sq in)	Price	Action
RD10013 RD Series Cylinder	100 / 44				33.406				20.63 / 8.84
RD556 RD Series Cylinder	55 / 28				19.219				11.04 / 5.63

Product Questions & Answers (3)

Question by: Travis P on Jan 11, 2026, 9:09 AM

got a job where i need to push and then pull back, what kinda force does this RD556 actually have both ways?

Answer by: Customer Support on Jan 13, 2026, 6:22 AM

On the push stroke it’s rated for up to 55 tons, and on the pull stroke it’s rated for up to 28 tons. The effective area is listed as 11.04 sq in for pushing and 5.63 sq in for pulling, which lines up with the different force ratings.

Question by: Norm J on May 25, 2025, 8:11 AM

Got a bridge lifting job coming up and need something that can both push and pull without swapping equipment out. This double-acting setup handle full tonnage in both directions?

Answer by: Customer Support on May 26, 2025, 5:51 PM

Pull capacity on this cylinder runs 28 tons and push goes up to 55, so both directions carry real working load. The load cap snaps out to expose internal piston rod threads for pulling applications, and those threads are rated to handle the full tonnage. You're not giving anything up on the pull side by using the same unit. Two 3/8" NPTF female half couplers are already built in, one for each circuit, so rigging it into a double-acting system is straightforward.

Question by: Johnny W on Jul 17, 2025, 11:11 AM

What kinda applications is this cylinder good for, like what industries use it?

Answer by: Customer Support on Jul 18, 2025, 7:08 PM

This SPX RD Series cylinder works well for heavy-duty tasks such as bridge work, building repairs, and keeping mining and utility equipment up and running.