638 Dim. is + .005; 750 Dim. is + .005-.000.
Unit of Measure
Items
Idler Ball Bearing

Ball Bearing Idler Sprocket Hardened Teeth

Idler Ball Bearing

Ball Bearing Idler Sprocket Hardened Teeth

Idler Ball Bearing

Ball Bearing Idler Sprocket Hardened Teeth

Idler Ball Bearing

Ball Bearing Idler Sprocket Hardened Teeth

Idler Ball Bearing

Ball Bearing Idler Sprocket Hardened Teeth
Number of Teeth_SYN N/A 20 N/A 17 N/A 18 N/A 15 N/A 17
Chain Number_SYN N/A 35 N/A 40 N/A 40 N/A 50 N/A 50
Outside Diameter_SYN N/A 2.600 in N/A 2.970 in N/A 3.140 in N/A 3.320 in N/A 3.720 in
Bore Diameter_SYN N/A 0.638 in
Length Through Bore_SYN N/A 0.720 in
Tooth Width_SYN N/A 0.168 in N/A 0.284 in N/A 0.284 in N/A 0.343 in N/A 0.343 in