140mm Custom Hydraulic Boom Cylinder For Large Excavators 16MPa

Oem Non Standard Boom Cylinder for Large Excavator Cylinder Mobile Machinery Cylinders Plunger-Type 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 strong, quiet friend who never falters. Custom-built for your large excavator, her plunger-type design gives her the muscle to lift mountains yet the grace to move with precision. Non-standard curves mean she fits your boom like a glove—no shims, no swearing. Chrome skin laughs at mud and grit, while balanced oil paths keep every move smooth and quiet. Day after dusty day she whispers, “I’ve got the load,” and the operator feels the ground without the worry. Application scenes:
Picture a quarry at dawn: she lifts massive rocks with a gentle hiss, placing them neatly on the truck. Or a construction site where she helps the excavator’s boom move smoothly, digging foundations without a tremor. From mountain quarries to urban digs, she’s the calm hand that keeps machinery moving gracefully, 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