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 - Restoration Story: 1951 Farmall H - by The Red (John Fritz). I have been a collector of Farmall tractors since 1990 when I first obtained part of the family farm in Eastern Indiana. My current collection includes a 1938 F20, 1945 H, 1946 H, and the recently purchased 1951 H. This article will focus on what I encountered and what I did to bring the 1951 NEAR DEATH Farmall H back to life.
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