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Concave skimmer disc blade 57615 diameter 360 mm 4-hole PCD 116

Concave skimmer disc blade part number 57615 engineered for plow skimmers to effectively cut crop residue and invert topsoil. Features a 360 mm outer diameter, 26 mm central hole, 4-hole flange (13 mm holes) on a 116 mm bolt circle, 4.5 mm thickness, and 31 mm concavity. Crafted from wear-resistant steel for extended service life and reliable soil penetration.

30 MnB5 boron steel
Optimized 31 mm concavity
Heavy-duty 4.5 mm thickness

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Description

Concave skim coulter disc blade diameter 360 mm - Part number 57615

Replacement concave disc blade for plough skim coulters, commercial part number 57615. Specifically designed for precise surface trash cutting, turf slicing, and inversion of organic residue into the bottom of the open furrow ahead of the main plough body. Manufactured from premium 30 MnB5 heat-treated boron steel, it delivers outstanding resistance against abrasive ground wear along with high structural flexibility to withstand stone impacts. Features an overall diameter of 360 mm, a heavy-duty 4.5 mm plate thickness, and a functional 31 mm concavity depth for clean soil inversion. Fitted with a 26 mm central pilot hole and a 4-hole mounting pattern (13 mm bolt holes) on a 116 mm bolt circle diameter (PCD), engineered for seamless pairing with standard skim coulter bearing hubs (e.g., part numbers 57612 and 57613).

Key features

30 MnB5 boron steelHeat-treated alloy steel construction ensuring superior surface hardness, extended wear life, and impact resistance.

Optimized 31 mm concavityCalibrated dish depth engineered for efficient soil lifting, slicing, and residue burial ahead of the main mouldboard.

Heavy-duty 4.5 mm thicknessReinforced profile built to absorb torsional stresses and prevent rim cracking in rocky or heavy clay soils.

116 mm PCD mounting pattern (4x13 mm)Four 13 mm mounting holes on a 116 mm bolt circle diameter providing positive, rigid clamping without looseness.

26 mm center pilot borePrecision center hole engineered for accurate seating onto the hub centering shoulder.

Specifications

Commercial part number	57615
Product type	Concave skim coulter disc blade
Material	Boron steel 30 MnB5
Outer diameter	360 mm
Thickness	4.5 mm
Concavity depth	31 mm
Center pilot hole	26 mm
Flange bolt pattern	4 holes Ø 13 mm
Bolt circle diameter (PCD)	116 mm

Fitting tipsPrior to mounting the concave disc blade, thoroughly clean the contact face of the skim coulter hub, removing scale, soil buildup, and old grease. Place the disc onto the hub flange ensuring the concavity faces the correct soil turning direction and that the 26 mm center hole fits squarely over the hub pilot pin. Insert the four mounting bolts through the 13 mm holes on the 116 mm PCD pattern and torque them evenly in a diagonal sequence to the recommended specification. Spin the disc assembly manually to ensure smooth, unhindered rotation before commencing field operations.