SSY004981300 Counterweight Bolt Sany SY1350C1C3KH Tracked hydraulic excavator spare parts

SSY004981300 Counterweight Bolt Sany SY1350C1C3KH Tracked hydraulic excavator spare parts

SSY004981300 is a counterweight bolt with a unique part number from Sany, specifically designed for the SY1250H 125-ton mining excavator. It integrates a high-strength alloy base material, precision thread structure, multiple anti-corrosion protections, and an anti-loosening locking design. It is the core fastener connecting the SSY007450352 counterweight assembly to the SSY008347233 slewing platform. Primarily used in large open-pit coal mines and metal mines for excavation and topsoil stripping operations, it uses high-strength fastening force to firmly fix the counterweight assembly to the rear of the slewing platform, resisting the severe vibrations and impact loads generated by heavy-duty excavation and slewing operations. This prevents the counterweight from loosening, shifting, or falling off, avoiding safety hazards such as machine center of gravity shift and tipping due to counterweight fixation failure. Suitable for mining conditions with high temperatures, high dust, strong vibrations, and large temperature differences, it is a key original equipment manufacturer (OEM) part for ensuring operational safety and reducing downtime losses in mines.

Core technical parameters

Model: SSY004981300, Part number for counterweight bolts specifically designed for Sany SY1250H 125-ton mining excavators.
Main material: Made of 20MnTiB high-quality alloy structural steel, quenched and tempered (quenching + high-temperature tempering) to obtain a tempered sorbite structure with a perfect balance of strength and toughness, achieving a strength grade of 10.9S, tensile strength ≥1040MPa, and yield strength ≥940MPa.
Operating temperature: -30℃ to 120℃; no brittleness or deformation at low temperatures; maintains good mechanical and locking properties at high temperatures.
Key operating parameters: Specifications are M25×180mm (thread length 80mm), thread accuracy reaches 6g level, clear tooth profile, no burrs, smooth engagement, torque coefficient controlled between 0.110 and 0.150, standard deviation within the same batch ≤0.010, ensuring consistent tightening force and controllable construction; rated tightening torque 850~950N·m, providing sufficient locking force to firmly fix the counterweight assembly; the head adopts a hexagonal head design, which is convenient for wrench tightening and suitable for on-site maintenance operations in mines; compatible with 10450540 washers.
Structural Design: Utilizing a hexagonal head and full thread structure, the thread profile undergoes precision rolling, resulting in higher strength than machined threads and reducing the risk of stripping or breakage. The transition between the head and shank features rounded corners to reduce stress concentration, enhance impact resistance, and prevent root breakage due to heavy-load vibration. An internal anti-loosening structure, used with an anti-loosening nut, effectively prevents bolt loosening under severe vibration, ensuring reliable fastening. The shank surface is smooth, free of scratches and cracks, allowing it to pass smoothly through the mounting holes of the counterweight assembly and the rotating platform, adapting to compact installation spaces without interfering with other components, and conforming to heavy-duty fastener structural design specifications.
Shape and Dimensions: The overall structure is a cylindrical hexagonal head, with a hexagonal head width of 36mm across sides, a thickness of 18mm, a rod diameter of 25mm, a total length of 180mm, and a thread length of 80mm. The mounting holes are precisely matched with the mounting holes of the SSY007450352 counterweight assembly and the SSY008347233 rotary platform, with a positional accuracy of ±0.05mm. It can be directly replaced and installed with the original parts.

Core functions and roles

As the “counterweight fastening core” of the SANY SY1250H 125-ton mining excavator, its core function is to provide strong and stable locking force to firmly fix the SSY007450352 counterweight assembly to the SSY008347233 slewing platform, ensuring the installation of the counterweight assembly, thereby maintaining the balance of the machine’s center of gravity and resisting the vibration and impact generated by heavy-duty operations. In large open-pit mines, water conservancy projects, and other scenarios, it not only prevents the safety hazards of the entire machine tipping over due to the loosening or falling off of the counterweight, but also works with 10450540 washers to distribute the fastening pressure, protecting the connection between the slewing platform and the counterweight assembly and avoiding component damage caused by bolt compression. At the same time, its high strength and fatigue resistance characteristics can adapt to the needs of 24-hour continuous heavy-load operation, reducing bolt breakage, stripping and other failures, reducing downtime and maintenance time and operating costs. Working together with the counterweight assembly, slewing platform, and washers, it forms the core fastening system for stable operation of the entire machine and is a key fastener to ensure the safety of 100-ton mining operations.

Applicable Scenarios

Widely used in the connection between the SSY007450352 counterweight assembly and the SSY008347233 slewing platform of the SANY SY1250H 125-ton mining excavator, this is a core fastener for the installation and fixation of the counterweight assembly. It can also be adapted to the counterweight fastening needs of other large mining excavators of the same specifications from SANY. It is particularly suitable for 24-hour continuous heavy-duty operation and harsh working conditions (high dust, strong impact, large temperature difference between day and night, high humidity) in open-pit mines and large-scale earthwork projects. It is an essential heavy-duty fastener for equipment manufacturing, overhaul, old machine upgrades and fault repair. At the same time, it is suitable for commercial scenarios such as equipment after-sales maintenance and bulk purchase of spare parts. Its original factory precision compatibility and high reliability can significantly reduce modification costs and downtime, and avoid safety hazards such as counterweight loosening and machine tipping caused by bolt failure.

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1 SSY008347233 Slewing Platform
2. Platform Supervisor Lu
5 SSY004911131 1250 Cab Assembly
6. Rotary Mechanism
8 SSY007450352 Counterweight Assembly
9 10275621 Adjusting shims
10 10450540 Washer
11 SSY004981300 Counterweight Bolt
18 Body panel assembly

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