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Notched disc harrow blade 55439 diameter 560 mm hex hole 37 mm

Notched disc harrow blade part number 55439 engineered for heavy duty tillage machinery and disc harrows. Manufactured from high strength 30 MnB 5 boron steel, it features a 560 mm outer diameter, 37 mm hexagonal center hole, reinforced 4.5 mm plate thickness, and 78 mm concavity, delivering aggressive crop residue cutting and long service life.

30 MnB5 boron steel
Notched cutting edge
Deep 78 mm dish concavity

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Description

Notched harrow disc blade 560 mm hex bore 37 mm - Part number 55439

Replacement notched disc harrow blade for agricultural disc harrows and soil cultivators, commercial part number 55439. Engineered for primary soil fracturing, aggressive clod crushing, and thorough slicing of crop residues, it delivers exceptional ground penetration even in heavy, compacted conditions. Manufactured from high-tensile 30 MnB5 boron steel, it ensures superior resistance to abrasive wear along with structural elasticity to endure sudden stone impacts. It features an overall diameter of 560 mm, a deep 78 mm dish concavity, a reinforced 4.5 mm plate thickness, and a 37 mm central hexagonal bore for mounting on hexagonal gang shafts.

Key features

30 MnB5 boron steelHeat-treated alloy steel formulation engineered to maximize surface hardness against abrasion while resisting severe shock loads.

Notched cutting edgeScalloped perimeter designed to maintain continuous gang rotation, slice dense root systems, and tackle hard untilled ground.

Deep 78 mm dish concavityCalibrated curvature profile optimized for effective soil turnover, clod fracturing, and residue burial into the seedbed.

Heavy-duty 4.5 mm thicknessRobust disc plate built to withstand high torsional loads and prolonged operational wear in abrasive soils.

37 mm hexagonal center holeAccurately sized hexagonal opening ensuring positive drive and eliminating rotational play on matching gang axles.

Specifications

Commercial part number	55439
Product type	Notched disc harrow blade
Material	Boron steel 30 MnB5
Diameter	560 mm
Center bore	Hexagonal 37 mm
Thickness	4.5 mm
Concavity	78 mm

Fitting tipsBefore installing the disc onto the hexagonal gang axle, clean off all dirt buildup, rust, and surface burrs from the shaft and mating spool spacers. Slide the notched blade into position ensuring the 78 mm dish concavity and cutting notches face the required operating angle of the gang assembly. Ensure that the 37 mm hexagonal bore seats flush onto the shaft flats without excessive bind to eliminate localized stress points. Torque the axle gang nut to the equipment manufacturer's specified rating and check the complete disc pack for proper tightness after the initial operational hours in the field.