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Plain disc harrow blade 56390 diameter 660 mm square hole 41 mm

Plain disc harrow blade part number 56390 designed for heavy duty agricultural tillage machinery. Manufactured from high strength 30 MnB 5 boron steel, it features a 660 mm diameter, 41 mm center square hole, heavy duty 6 mm plate thickness, and 100 mm deep concavity, ensuring outstanding soil inversion and long-lasting field durability.

30 MnB5 boron steel
Smooth plain edge
Deep 100 mm dish concavity

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Description

Plain harrow disc blade 660 mm square bore 41 mm - Part number 56390

Plain disc harrow blade for heavy agricultural disc harrows and deep tillage equipment, commercial part number 56390. Designed for primary soil cultivation, ground leveling, and thorough crop residue sizing in heavy soil conditions, it provides a smooth, consistent cut across demanding field applications. Manufactured from high-tensile 30 MnB5 boron steel, it ensures superior wear resistance alongside structural elasticity to endure severe impacts against buried stones. It features an extra-large overall diameter of 660 mm, a deep 100 mm dish concavity, a heavy-duty 6 mm plate thickness, and a 41 mm central square bore for large-section gang axle mounting.

Key features

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

Smooth plain edgeContinuous cutting profile ensuring even soil slicing, consistent crumbling, and uniform seedbed leveling.

Deep 100 mm dish concavityPronounced curvature profile designed for thorough soil inversion and efficient burial of surface crop residue.

Heavy-duty 6 mm thicknessRobust disc plate engineered to withstand extreme torsional stress and prolonged wear in harsh, heavy soils.

41 mm square center holeHeavy-duty central opening ensuring a secure, non-slip lock onto large-section harrow gang axles.

Specifications

Commercial part number	56390
Product type	Plain disc harrow blade
Material	Boron steel 30 MnB5
Diameter	660 mm
Center bore	Square 41 mm
Thickness	6 mm
Concavity	100 mm

Fitting tipsBefore installing the disc onto the square gang axle, clean off all dirt buildup, rust, and surface burrs from the shaft and mating spool spacers. Slide the blade into position ensuring the 100 mm dish concavity matches the required operating angle of the gang assembly. Ensure that the 41 mm square bore seats flush onto the shaft 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.