60249819 Screw Sany SY1350C1C3KH Tracked hydraulic excavator spare parts

60249819 Screw Sany SY1350C1C3KH Tracked hydraulic excavator spare parts

60249819 is a Sany original factory exclusive screw, designed specifically for the heavy-duty connection scenario of SY1250H mining excavator. It is suitable for the high pressure and strong impact working characteristics of this model. It integrates the core characteristics of high-strength alloy material, precision thread, vibration resistance and anti-loosening, corrosion resistance and wear resistance. It conforms to GB/T 3098.1-2010 “Mechanical properties of fasteners bolts, screws and studs”, MT/T-187.1-88 and other national and industry standards . It is matched with components such as B210780000693 split flange and 24000632 gasket. It is suitable for open-pit mining and can avoid thread stripping, screw breakage and other failures. It is a key original factory accessory for safe operation in the mine.

Core technical parameters

Model: 60249819
Main body material: 10.9 grade high-strength alloy steel (35CrMo, 40Cr) or 304 stainless steel are both available.
Operating temperature: -30℃ to 150℃, suitable for open-pit mines with large day-night temperature differences and high-temperature environments in hydraulic systems.
Core working parameters: Specifications are compatible with M16-M30 (fitting SY1250H connection size), length 20-90mm, size tolerance ±0.02mm, thread tolerance adopts 6g/6H fit, coarse thread design; 10.9 grade alloy steel tensile strength ≥1000MPa, yield strength ≥900MPa, hardness 32-39HRC, elongation after fracture ≥9%, tightening torque 110-420N·m[4][8]; adopts cold heading + thread rolling precision forming process, surface roughness Ra≤0.4μm, service life ≥8000 working hours,
Structural Design: Employs an external hexagonal head structure, with performance grade and manufacturer identification markings on the head; triangular cross-section threads provide good anti-loosening properties, and the fully threaded rod segment is suitable for heavy-duty applications; the head is chamfered to prevent scratching of washers and flange surfaces, and the tail is tapered for guidance.
Shape and size: Standard cylindrical thread structure, regular shape, no burrs, no cracks, no deformation. Dimensions are precisely matched with SY1250H split flange, 24000632 gasket, and main pump connector. Customized according to original factory standards.
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. Its corrosion resistance is 7-10 times that of ordinary electroplated zinc, and its salt spray resistance is ≥1200 hours; the stainless steel version adopts a double treatment of mechanical polishing + passivation.

Core functions and roles

As a “high-strength fastening core connector” of the SY1250H, its core function is to transmit high-strength fastening force, tighten all core parts, distribute pre-tightening force, protect the connection surface, prevent loosening and vibration, and avoid connection failure caused by local stress concentration. It can reduce the wear and tear of components such as flanges and gaskets, reduce operation and maintenance costs, and work together with gaskets and flanges to form a fastening system, making it a key component for stable mining operations.

Applicable Scenarios

Widely used in connection parts of SY1250H split flanges, main pump connections, steel structures, etc., and compatible with related supporting components, it provides high-strength fastening, anti-loosening, and vibration-resistant functions. It can also be used with Sany mining excavators of the same specifications. Suitable for harsh working conditions such as open-pit mines, it is an essential accessory for equipment manufacturing, maintenance, and bulk procurement. It can reduce downtime costs caused by loose components and connection failures, and improve the overall structural stability of the machine.

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