Locknut 126-1971

Locknut 126-1971

Excavator    Caterpillar    365B, 365C

Boom Cylinder    Bore        Stroke        Hydraulic Cylinder

1261971

Compatible Brand: Caterpillar

Part Number: 126-1971 (1261971)

Superseded / Interchange Numbers: 126-1971, 1261971

Part Name: Excavator Boom Cylinder Piston Locknut

Technical Specifications: Application: Boom Hydraulic Cylinder / Location: Piston-to-Rod Retention / Weight: Not Specified (Heavy-Duty Alloy Steel) / Hydraulic Cylinder Locknut Component

Compatible Machinery: Caterpillar Heavy Mining Hydraulic Excavators (365B, 365C series)

What It Does:

Serves as the high-strength piston retaining locknut operating inside the primary boom lift hydraulic cylinders on Caterpillar 365B and 365C series large hydraulic excavators. Torqued onto the cylinder rod, it securely fastens and locks the piston head onto the piston rod assembly, ensuring zero axial play and maintaining mechanical stability under high-pressure bidirectional hydraulic strokes.

Importance:

A critical retention fastener engineered to withstand immense cyclic tensile and compressive forces, hydraulic pressure spikes, and severe vibrations during heavy boom lifting and mass excavation. Manufactured from high-tensile alloy steel with precision-machined threads, it prevents thread shearing, piston loosening, and catastrophic internal cylinder barrel damage under extreme mining and quarrying conditions.

As Seçkin Makine, we manufacture this product as an aftermarket item fully equivalent to the original specifications in terms of raw materials, technical dimensions, and performance characteristics. This product comes with a 1-year warranty from the invoice date.