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Skimmer arm support 50x30 4-hole part 57612 for concave disc

Skimmer arm support unit part number 57612 with 50x30 mm shank, designed for concave disc blades. Features a 90 mm bearing housing sleeve with welded pin, 30 mm central support pin with disc centering, and dual angular contact ball bearings. Built with a 4-hole flange (13 mm holes) on a 116 mm bolt circle for smooth disc rotation and heavy duty performance.

50x30 mm shank compatibility
Double-row angular contact ball bearings
90 mm housing with welded stud

€299.00VAT incl.

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Description

Skim coulter hub assembly 50x30 with 4-hole flange for concave disc - Part number 57612

Replacement integrated bearing hub unit for concave skim coulter disc assemblies on agricultural ploughs, commercial part number 57612. Engineered to fit standard 50x30 mm shank legs, it ensures accurate alignment and smooth rotational support for the coulter blade, enhancing surface soil slicing and residue burial ahead of the main plough body. Features a heavy-duty 90 mm outer bearing housing with a welded mounting stud, paired with a 30 mm central pivot pin equipped with a precision disc centering shoulder. The internal rotational mechanism is driven by 2 double-row angular contact ball bearings, built to handle heavy combined radial loads and axial side thrusts in tough soils. Includes a 4-hole disc mounting flange with 13 mm holes on a 116 mm bolt circle diameter (PCD).

Key features

50x30 mm shank compatibilityEngineered for secure attachment to standard 50x30 mm skim coulter support legs.

Double-row angular contact ball bearingsFitted with 2 heavy-duty oblique bearings to absorb combined radial and axial shock loads without developing play.

90 mm housing with welded studRugged outer sleeve construction providing structural rigidity for the complete rotational hub unit.

Precision 30 mm center pinFeatures a dedicated centering shoulder ensuring coaxial alignment of the concave disc blade to prevent vibration.

4-hole flange 116 mm PCDHeavy-duty mounting pad with four 13 mm holes designed for positive clamping of the coulter blade.

Specifications

Commercial part number	57612
Product type	Skim coulter hub for concave disc
Compatible shank section	50x30 mm
Bearing housing outer diameter	90 mm
Center pin diameter	30 mm (with centering shoulder)
Internal bearing type	2 double-row angular contact ball bearings
Disc flange pattern	4 holes Ø 13 mm
Bolt circle diameter (PCD)	116 mm

Fitting tipsPrior to installing the hub onto the 50x30 mm shank, clean all mounting interfaces, removing scale, soil buildup, and rust. Position the concave disc blade onto the hub flange, ensuring the 30 mm center pin seats fully into the disc's pilot hole for accurate centering. Insert the 4 mounting bolts through the 13 mm holes on the 116 mm PCD and tighten in a cross-pattern to prevent uneven pressure on the internal bearing race. Spin the disc assembly manually to confirm smooth, resistance-free rotation, and re-torque all mounting hardware after the initial operational hours in the field.