A210204000354 Screw Sany SY1350C1C3KH Tracked hydraulic excavator spare parts

A210204000354 Screw Sany SY1350C1C3KH Tracked hydraulic excavator spare parts

A210204000354 is a screw with a special part number from Sany, designed specifically for the heavy-duty connection scenario of the SY1250H mining excavator. This model has a large operating load and violent vibration. The connection parts of the split flange, main pump connection body and other components need to withstand high pressure and strong impact, and the requirements for the strength, shear resistance and anti-loosening of the screw are extremely high. It integrates the core characteristics of high-strength alloy material, precision thread accuracy, anti-vibration and anti-loosening structure, corrosion resistance, oil resistance and wear resistance, and complies with national and industry standards such as GB/T 3098.1-2010 “Mechanical properties of fasteners bolts, screws and studs” and GB/T 1228-2006 “High strength large hexagon head bolts for steel structures” . It is matched with the B210780000244 split flange, SSY007338266 main pump connection body, B230101000578 O-ring and pump room pipeline. Suitable for open-pit coal mines and metal mines, it can prevent faults such as stripped threads, loose parts, and connection failures. It is a key original part for ensuring continuous and safe operation of the whole machine in the mine.

Core technical parameters

Model: A210204000354
Main body material: Available in 12.9 grade high-strength alloy steel (SCM435, 35CrMo) and 304 stainless steel. Underwent deep heat treatment (quenching + tempering), resulting in a dense, impurity-free material with no burrs or cracks, and high thread precision.
Operating temperature: -30℃ to 150℃
Key operating parameters: M12-M30 size (fits SY1250H connection dimensions), length 15-85mm, dimensional tolerance ±0.02mm, thread tolerance 6g/6H fit; 12.9 grade alloy steel with tensile strength ≥1200MPa, yield strength ≥1080MPa, hardness 385~435HV10 (or 33~39HRC), elongation after fracture ≥8%; tightening torque 80-380N·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, providing excellent anti-loosening capabilities and effectively suppressing loosening caused by vibration; the screw head is chamfered to prevent scratching washers, split flanges, and component surfaces, while the tail features a tapered guide design for easy and quick screwing into pre-drilled holes; built-in anti-loosening grooves, when used with high-strength washers, further enhance the anti-loosening effect; reinforcing ribs are added to key areas for vibration resistance and deformation prevention.
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 uses a dual protection process of phosphating and Dacromet coating to avoid the risk of hydrogen embrittlement, improve corrosion resistance and lubricity, and is suitable for high-pressure and heavy-duty fastening scenarios; the stainless steel version uses a dual treatment of mechanical polishing and passivation to enhance corrosion resistance; salt spray resistance ≥1500 hours.

Core functions and roles

As the “high-strength fastening core connector” of the SY1250H, its core function is to transmit high-strength fastening force, secure core components such as the split flange, main pump connection body, and hydraulic pipelines, disperse preload, protect connection surfaces, achieve vibration-resistant and anti-loosening connections, and avoid connection failures caused by localized stress concentration. It can prevent hydraulic system failures and sudden equipment shutdowns caused by bolt breakage, stripped threads, or loose components, extend the service life of core components such as the split flange, main pump connection body, pipelines, and seals, reduce operation and maintenance costs, and work in conjunction with high-strength gaskets, main pump connection body, and split flanges to form a complete machine fastening and protection system. It is a key high-strength fastening component ensuring 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 B210780000244 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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