Customized 80 56-70 F1-7 Support Roller Lock Door Plate Differential Oil Cylinder for Engineering Machinery Construction Machinery Good Hydraulic Cylinders – We Make Sure Inside Parts
The tube follows GUOYUE CD250 style.
Tube steel can be 45#, 42CrMo, or 27SiMn.
Hole is ground to H8 and feels smooth, Ra under 0.4 μm.
Head, base, ears, and piston are only 45# steel.
We do not use cast iron or cast steel. Slow-Down Parts
You can pick fixed bumpers or floating bumpers so the rod slows down safe at any speed or load. Welds
We hit every heavy-load weld with ultrasound.
This takes away most of the stress and makes the weld last longer. Seals
We only use top seals from NOK (Japan), Trelleborg (Sweden), Merkel and GP (Germany).
We do not use local seals. Checks
Each cylinder is tested to GB/T15622-2005 and our own Q/GAKY014-2023.
You get a test sheet and a pass paper. Promise
We give one year cover from ship date.
If it breaks because of how we made it, we fix or swap it for free.
This cylinder is strong. It uses thick steel and hard rod. It does not bend. The seal keeps oil in, no leak. It has many tubes that slide out one by one. It lifts high but stays short Advantages:
She’s the quiet guardian who holds the door steady. An 80 mm heart and 56-70 mm stroke give her the gentle strength to lock the support roller plate with precision. Differential control means she adjusts on the fly—no jolt, no hesitation. Custom-built to fit snugly into your engineering machinery, she slides in like a missing puzzle piece—no shims, no swearing. Day after day she whispers, “Hold tight, I’ve got the lock,” and the machine runs smoothly without a hitch. Application scenes:
Picture a construction site at dawn: a massive excavator’s support roller plate locks into place with a gentle click, thanks to her steady push. Or a bulldozer on a narrow mountain road where she keeps the door plate secure while the machine moves earth. From tunneling projects to road construction, she’s the calm hand that keeps machinery stable and safe, turning brute force into gentle precision.

Application	Engineering machinery, mine, shipping, metallurgy, water conservancy, offshore, agriculture, etc.
Seal	Parker, Merkel, NOK, Hallite,etc.
Paint	Red, Grey, Yellow, Black, etc.
Material	St52, CK45, 4140, Duplex2205, Stainless Steel 304/316, etc.
Certificate	ABS, Lloyds, SGS, etc.
Package	Bubble-wrap packing, then in wooden case.
Color	choose the color according to customer requirement
Core components	Bearing,Pressure vessel,Pump
Is it a standard part?	Nonstandard
Structure	Piston Type, Plunger Type, Telescopic Type,
Power	Hydraulic & Pneumatic
Brand	Guoyue
Sample	Available