A210204000454 Screw Sany SY1350C1C3KH Tracked hydraulic excavator spare parts

A210204000454 Screw Sany SY1350C1C3KH Tracked hydraulic excavator spare parts

Screw A210204000454 is a Sany original part number screw, specifically designed for heavy-duty connection scenarios in the SY1250H mining excavator. This model operates under heavy loads and intense vibrations, and the connection points of components such as the split flange and main pump connection body need to withstand high pressure and strong impacts, requiring extremely high strength, shear resistance, and anti-loosening properties from the screw. It integrates high-strength alloy material, precision thread accuracy, vibration-resistant and anti-loosening structure, and corrosion-resistant, oil-resistant, and wear-resistant core characteristics. Suitable for open-pit coal mines and metal mines, it can prevent thread stripping, component loosening, and connection failure, making it a key original part for ensuring continuous and safe operation of the entire machine in the mine.

Core technical parameters

Model: A210204000454
Main body material: 10.9 grade high-strength alloy steel (SCM435, 35CrMo) or 304 stainless steel (A2-70 grade) are both available.
Operating temperature: -30℃ to 150℃, suitable for open-pit mines with large temperature differences between day and night and high-temperature working environments of hydraulic systems.
Key operating parameters: M12-M28 size (fits SY1250H connection dimensions), length 15-80mm, dimensional tolerance ±0.02mm, thread tolerance 6g/6H fit; 10.9 grade alloy steel, tensile strength ≥1040MPa, yield strength ≥900MPa, hardness 33-39HRC, elongation after fracture ≥8%; tightening torque 75-350N·m; cold heading + thread rolling precision forming process, surface roughness Ra≤0.4μm, service life ≥8000 working hours.
Structural Design: Utilizing an external hexagonal structure for easy and quick tightening and disassembly, improving installation and maintenance efficiency; the thread features a triangular cross-section design; the screw shank is a fully threaded section, manufactured to Class 2 free-fit precision; the screw head is chamfered, and the tail features a tapered guide design; built-in anti-loosening grooves, when used with high-strength washers, further enhance the anti-loosening effect.
Shape and size: Standard cylindrical thread structure, regular shape, no burrs or cracks. Dimensions are precisely matched to the SY1250H split flange, main pump connection body, gaskets, and seals. Specifications and lengths are customized according to original factory assembly standards. Installation hole positions are precise, allowing for direct replacement with original factory parts.
Surface treatment: The alloy steel version adopts a double protection process of phosphating + Dacromet coating, with no electrolytic reaction throughout the process, fundamentally eliminating the risk of hydrogen embrittlement, improving corrosion resistance and lubricity, and with a salt spray resistance of ≥1500 hours. Its corrosion resistance is 7-10 times that of ordinary electroplated zinc. The stainless steel version adopts a double treatment of mechanical polishing + passivation.

Core functions and roles

As a “high-strength fastening core connector” of SY1250H, its core function is to transmit high-strength fastening force, fasten core components such as split flange, main pump connection body, and hydraulic pipeline, disperse pre-tightening force, protect connection surface, realize vibration-resistant and anti-loosening connection, and avoid connection failure caused by local stress concentration [2][8]. It can avoid hydraulic system failure and equipment stoppage caused by bolt breakage, stripping or component loosening, extend the service life of core components such as split flange, main pump connection body, pipeline, and seals, reduce operation and maintenance costs, and form a whole machine fastening protection system in conjunction with high-strength gasket, main pump connection body, and split flange. It is a key high-strength fastening component to ensure stable and efficient mining operations.

Applicable Scenarios

Widely used in the SY1250H machine’s split flange, main pump connection, and hydraulic pipeline connection parts, it is compatible with B210780000693 split flanges, SSY007338266 main pump connectors, B230101000578 O-rings, and pump chamber pipelines. It provides high-strength fastening, anti-loosening, vibration resistance, and fixed protection functions, and can also be used with large mining excavators of the same specifications. Suitable for 24-hour continuous heavy-duty and harsh working conditions in open-pit mines and earthmoving projects, it is an essential high-strength fastening accessory for equipment manufacturing, overhaul, after-sales maintenance, and bulk procurement. It can reduce downtime costs caused by loose parts and connection failures, and improve the overall structural stability of the machine.

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