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 These are the different sizes of Schaller locknuts. 

Model R1 R2 R3 R4 R5 R6 R7 R8 R9 R10
Width

39.7mm

1.5625"

41.3mm

1.6825"

42.85mm

1.6875"

42.85mm

1.6875"

44.45mm

1.7500"

39.7mm

1.5625"

41.3mm

1.6250"

42.85mm

1.6875"

42.85mm

1.6875"

42.85mm

1.6875"

E-e

33.25mm

1.3090"

34.80mm

1.3710"

35.95mm

1.4155"

36.45mm

1.4355"

37.90mm

1.491"

33.25mm

1.309"

34.80mm

1.3710"

36.45mm

1.4355"

36.45mm

1.4355"

36.45mm

1.4355"

Spacing

6.10mm

.2398"

6.35mm

.2502"

6.60mm

.2591"

6.70mm

.2631"

6.95mm

.2736"

6.10mm

.2398"

6.35mm

.2502"

6.70mm

.2631"

6.70mm

.2631"

6.70mm

.2631"

Bullet recess No No No No No Yes Yes No Yes No