A210111000321 Bolt Sany SY1350C1C3KH Tracked hydraulic excavator spare parts

A210111000321 Bolt Sany SY1350C1C3KH Tracked hydraulic excavator spare parts

A210111000321 is a bolt 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 steel structure and hydraulic components need to withstand high pressure and strong impact, and the bolts have extremely high requirements for strength, shear resistance and anti-loosening performance. 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” [4][8][9]. It is matched with A210491000122 high-strength washers for steel structures, 150106010111A double plunger pump set, pump room pipeline and steel structure components of the whole machine. 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: A210111000321
Main body material: 10.9 grade/12.9 grade high-strength alloy steel (35CrMo, SCM435) 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-M36, length is 20-100mm, size tolerance is ±0.02mm, thread tolerance adopts 6g/6H fit; hardness is 33-39HRC (10.9 grade), 38-44HRC (12.9 grade) [9], tightening torque is 120-450N·m, the thread adopts coarse thread design, the tightening torque is low and the locking performance is strong; adopts cold heading + thread rolling precision forming process, surface flatness is ≤0.01mm, service life is ≥8000 working hours.
Structural design: Employs an external hexagonal head structure; the thread uses a triangular cross-section design; the bolt head is chamfered, and the tail uses a tapered guide design; built-in anti-loosening threads.
Shape and size: It features a standard cylindrical threaded structure, with a regular shape, free of burrs and cracks. The dimensions are precisely matched to the SY1250H steel structure connection interface, hydraulic component interface, and high-strength washers. Specifications and lengths are customized according to the original factory assembly standards.
Surface treatment: The alloy steel version uses a dual protection process of phosphating and Dacromet coating to avoid the risk of hydrogen embrittlement and improve corrosion resistance and lubricity; the stainless steel version uses a dual treatment of mechanical polishing and passivation to remove surface burrs and oxides, and has a salt spray resistance of ≥1500 hours.

Core functions and roles

As the “high-strength fastening core connector” of SY1250H, its core function is to transmit high-strength fastening force, fasten the core components such as the whole machine steel structure, double plunger pump group, and pump chamber pipeline, achieve vibration-resistant and anti-loosening connection, protect the connection surface from scratches, disperse the pre-tightening force, and avoid connection failure caused by local stress concentration [4][8]. Strictly match the requirements of high-strength bolt connection pair to avoid bolt breakage, stripping or loosening of connection, avoid component detachment and hydraulic system failure caused by vibration, extend the service life of core components such as steel structure, pump group, and pipeline, reduce operation and maintenance costs, and form a whole machine fastening protection system in conjunction with high-strength washers, steel structure and hydraulic components. It is a key high-strength fastening component to ensure stable and efficient operation of mining steel structure.

Applicable Scenarios

Widely used in the steel structure connection parts of the SY1250H machine, it is compatible with A210491000122 high-strength washers for steel structures, 150106010111A double plunger pump sets, and the connection between pump chamber pipelines and steel structures. It provides high-strength fastening, anti-loosening, vibration resistance, and fixed protection functions. It can also be used with large-scale mining excavator steel structures and hydraulic components 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 components and connection failures, and improve the overall structural stability of the machine.

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