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Coulters, Discs & Scrapers

Using top quality materials and cutting edge heat-treatment methods, Ralph McKay coulters are crafted with quality and reliability in mind. Our coulters and discs are dependable and designed to exceed OEM specifications, achieving an impressive service life. Look through the Bolt Patterns chart on the Resources page for more information on what we have to offer.

Chart Display Options:


Available for most Radial Hole patterns, also No Radial Holes.

Countersunk holes available upon request.

Double Bevel Edge available upon request.

3.00mm 3.5mm 4.5mm 5.0mm 6.35mm
12 300mm
14 350mm
16 400mm
17 432mm
18 450mm
18 3/8 467mm
19 483mm
20 508mm
22 559mm
24 610mm


Plain or Notched (Scalloped).

Available in most centre hole patterns.

Radial holes available upon request.

Flat Back; Unsharpened Edge; Raised Centres; Re-Rollable – all available upon request.

3.00mm 3.5mm 5.0mm 6.35mm 7.5mm Concavity
12 300mm
14 350mm 1.17″
16 400mm 1.50″
18 450mm 1.75″
20 508mm 2.0″
22 559mm
24 610mm


DS Barton ADO-2 ADO-2-V2
Left 23001 93 9193
Right 23002 94 9194