587820301 4-bolt greasable spindle. Includes mandrel housing, spindle, bearing, and bolts. 
This Spindle is used on various Husqvarna, Craftsman, and Poulan tractors. *spindle mounts do not come threaded. Consider purchasing Stens alternative 285-585 if you want this convenience. 
 
Replaces OEM Part number: 587125401
This assembly includes the following parts:
192872 Shaft Assembly, Mandrel
187281 Housing, Mandrel
110485X Ball Bearing, Mandrel
196539 x 4 - shoulder bolts
Alternate:
Ariens: 21546238, 21546299, 21549012
AYP: 187292, 192870, 532192870, 587125401, 192872, 587253301, 587819701
Dixon: 532187292, 532192870
Husqvarna: 192870, 532187281, 532187292, 532192870, 539112057
McCulloch: 532 19 28-70
Poulan: 532192870
Stens 285-585 
Oregon 82-029