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SLYM
China
Subject to model and order requirements.
T/T, L/C, Western Union
standard export packaging
Confirmed according to stock status and order specifications.
avalible
The Back Head (also referred to as the Rear Cylinder, Top Cap, or Upper Cylinder Housing in three-stage hydraulic breakers) is the critical pressure-retaining top component of the power cell assembly. In a standard three-stage hydraulic hammer design (comprising Back Head, Main Cylinder, and Front Head), the Back Head performs two vital operational functions:
First, it houses the integrated high-pressure Nitrogen (N₂) gas chamber that acts as an energy accumulator, absorbing piston recoil impact and boosting downward strike frequency.
Second, it provides the main structural anchor for the long through-bolts (side bolts) that clamp the entire power cell together under extreme hydraulic working pressure.
SLYM MACHINERY manufactures heavy-duty, heat-treated 20CrMo forged alloy steel Back Heads precision-machined to direct OEM specifications for global hydraulic breaker brands including Soosan, Furukawa, Montabert, Krupp, NPK, Everdigm, and Rammer.
Metallurgy & Manufacturing: 20CrMo Forged Alloy Steel
SLYM Back Heads are produced from high-grade 20CrMo (Chromium-Molybdenum) structural alloy steel. Selected for its exceptional hardenability, tensile strength, and impact fatigue resistance, 20CrMo provides absolute protection against gas chamber wall deformation and bolt-pocket stress cracking under continuous high-frequency pressure waves.
Precision Manufacturing Standards:
3D High-Density Forging: Eliminates internal porosity, shrinkage voids, and structural inclusions, guaranteeing 100% fluid and gas tight integrity.
Controlled Quenching & Tempering (Q&T): Subjected to thermal processing to achieve a tough, shock-absorbing core (HB 260-310 / HRC 28-35) combined with wear-resistant sealing faces.
Micron-Precision CNC Boring: Gas chamber bores and seal landing grooves are CNC-machined and mirror-honed to maintain strict micro-clearances, preventing nitrogen leakage and O-ring extrusion.
100% Non-Destructive Testing: Every Back Head undergoes Ultrasonic Testing (UT) and Magnetic Particle Inspection (MT) to ensure 100% crack-free structural performance before factory dispatch.
Key Product Features
Heavy-Duty 20CrMo Construction: High yield strength resists gas chamber swelling and structural distortion during continuous quarrying.
Precision N2 Gas Chamber Sealing: CNC-machined seal landings prevent nitrogen gas pressure drops, maintaining consistent breaking impact energy.
Reinforced Through-Bolt Anchor Pockets: Threaded and counterbored bolt areas are stress-relieved to prevent fatigue fracturing under asymmetric bolt torque.
Direct OEM Interchangeability: Fully compatible with original factory dimensions, gas charging valve threads, and power cell mounting interfaces.
B2B Identification & Ordering Checklist
To ensure 100% dimensional compatibility and eliminate replacement errors, please provide SLYM engineers with:
Hydraulic Breaker Brand & Exact Model (e.g., SB81, HB20G, MB1500, F22).
Original Part Number or stamped body markings.
Key Dimensions: Gas chamber bore diameter, total height, through-bolt pitch circle diameter (PCD), and gas valve thread spec.
Clear Photos & Parts Diagram Drawings: Showing the top gas valve port and lower cylinder mating flange.
Request a Factory Quote
Replacing a cracked Back Head or upgrading your hydraulic breaker fleet? Contact SLYM MACHINERY with your breaker model, part numbers, or technical drawings for direct factory-direct pricing and rapid global delivery.
Email: info@slymmachinery.com
Website: www.slymmachinery.com
