NK  Standard Sprockets Double-B  type 
NK120-2C
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Chain Pitch (P) 38.10 mm(1-1/4   inch)
Inner Width (W) 25.40 mm
Roller Dia. (Dr) 22.23 mm
Tooth Width  (T) 22.7 mm
(M) 68.1 mm
(Dimension : mm)
Sprocket No. Outside Dia.
Do		 Pitch Dia.
Dp		 Bore Dia. d Hub Weight
(kg)		 Material Teeth
Type Teeth Stock Bore Min Max BD BL
NK120-2C 40 507 485.60 43 45 125 177 140 84.30 Mild Steel 
Welded Hub		 40
42 531 509.84 43 45 125 177 140 87.00 42
45 568 546.19 43 45 125 177 140 98.50 45
48 604 582.54 43 45 125 177 140 104.00 48
50 628 606.78 43 45 125 177 140 115.00 50
54 677 655.26 43 45 125 177 140 121.00 54
60 750 727.99 43 45 125 177 160 131.60 60