| Listed in parts books | Not catalogued by year yet |
NORTON MAIN BEARING NSK JAPAN (ROLLER) - Replaces NM17824 - PRESSED STEEL CAGE
A Norton engine main bearing, NSK roller type with a pressed steel cage, replacing the older NM17824.
This is a main bearing for the Norton engine, a roller-type unit made by NSK of Japan with a pressed steel cage. It replaces the older factory number NM17824, so if your parts book or an old engine casing shows that number, this is the current equivalent to order.
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Main bearings carry the crankshaft in the cases and take the running loads of the rotating assembly, so condition matters more than most hardware on the bike. Since this is a roller bearing rather than a plain bushing, it's worth checking the shaft journal and case register for wear before fitting a new one.
We don't have additional catalog history on this part beyond the supersession note. If you're not certain this is the bearing your particular Norton engine calls for, give us a call and we'll confirm before you order.
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