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Plain disc harrow blade 55438 diameter 510 mm hex hole 92 mm

Plain disc harrow blade part number 55438 designed for agricultural tillage machinery and disc harrows. Manufactured from high strength 30 MnB 5 boron steel, it features a 510 mm outer diameter, 92 mm oversized hexagonal center hole, 3.5 mm thickness, and 61 mm concavity, delivering consistent soil inversion and dependable field durability.

30 MnB5 boron steel
Smooth plain edge
Calibrated 61 mm dish concavity

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Description

Plain harrow disc blade 510 mm hex bore 92 mm - Part number 55438

Plain disc harrow blade for agricultural disc harrows and soil cultivators, commercial part number 55438. Designed for shallow cultivation, seedbed leveling, and crop residue sizing, it provides a smooth, consistent cut across varying field conditions. Manufactured from high-tensile 30 MnB5 boron steel, it ensures exceptional wear resistance alongside structural elasticity to endure impacts against buried field stones. It features an overall diameter of 510 mm, a 61 mm dish concavity, a 3.5 mm plate thickness, and an extra-large 92 mm central hexagonal bore for mounting on heavy-duty hexagonal gang hubs or shafts.

Key features

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

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

Calibrated 61 mm dish concavityCurvature profile designed for thorough soil inversion and efficient burial of surface crop residue.

Calibrated 3.5 mm thicknessDisc plate thickness balanced for easy ground penetration, reduced draft requirement, and operational durability.

Extra-large 92 mm hexagonal center holeOversized hexagonal opening ensuring positive drive and eliminating rotational play on matching large gang hubs.

Specifications

Commercial part number	55438
Product type	Plain disc harrow blade
Material	Boron steel 30 MnB5
Diameter	510 mm
Center bore	Hexagonal 92 mm
Thickness	3.5 mm
Concavity	61 mm

Fitting tipsBefore installing the disc onto the hexagonal gang shaft or hub, remove all dirt buildup, rust, and surface burrs from the seating area and mating spool spacers. Slide the blade into position ensuring the 61 mm dish concavity matches the required operating angle of the gang assembly. Ensure that the 92 mm hexagonal bore seats flush onto the shaft flats without excessive bind to eliminate localized stress concentrations. 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.