From smallest to biggest diameter. Size of disks,along with the shaft speed where they are mounted, as it relates to wheel speed, is what makes one better then another. A 5" disk on a high-reduction shaft could work better then an 8" disk on a shaft with less reduction - and I don't have all those specs. Here are disk sizes, smallest to biggest.
Deere 40, 420, 440, 1010 - 5” diameter disk, 21 spline, .575” thick. 1010 uses two per side.
320, 330, 420, and 1010s (some) use the 5” disk with 25 splines/ 1 5/8” spline ID
Deere MT and Farmall Super C, 200, 230, 240, 330, 340, 404, and 2404 use a 5” disk, two per side, and 10 spline with 1 5/8” spline ID.
International Harvester and Farmall - H, Super H, Super HV, Super W4, OS4, 300, 350, - 5 5/8” diameter, 10 spline with 1 7/8” spline ID. Two per side. .525” thick.
Oliver - Super 55 and 65, Super 66, 550, 660 - 5 5/8”, 26 spline with 2 1/4” spline ID.
Case: 200B, 300, 300B, 320, 320B, 350, 400B, 420B, 420BD, (430, 530, BOTH BEFORE SN#6165269) 500B, 600B, 630, W3, W5, W5A - 6” diameter, 17 spline by 2.245” spline ID. .550” thick and two per side.
International Harvester and Farmall: 340 (Dsl), 460, 504, 606 10 Spline, 6" Dia, 1-7/8" Spline ID -4 used per tractor IH: 368292R92, 1975460C2
International Harvester and Farmall - M, Super M, MD, Super MD, MV, Super MV, Super MDV, MTA, 400, 450, Super W6, Super WD6, W400, W450, Supe W6TA, OS6, ODS6, - 6.5” diamter, 12 spline with 2 1/4” spline ID. Two per side.
International Harvester and Farmall: IH 354, 364, 384, 424, 444 + 1-5/8 Spline ID, 6-1/2" O.D., 10 Spline --- 4 used per tractor.
International Harvester and Farmall: 656, 664, 666, 686, 2656, Hydro 70, Hydro 86 4 used per tractor, sold individually --- 6.5" Diameter - 3.50" Hub - 10 Spline 391445R91, 1975463C2, 1975463C3
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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