Imperial Bearing Surprise!

[Peter_HParticipant @peter_h]

So, according to my parts manual I need a Hoffmann S9 7/8″id x 1.7/8″od x 3/8″ bearing. Found that KLNJ7/8 is the replacement, ordered a cheapo one from ebay and it arrives with a width of 1/2″ not 3/8″. After a lot of hunting I have found that the KLNJ7/8 replacement part is 3/8″ wide as an open bearing, but 1/2″ wide when it is a -2RS or -ZZ. Never in 50 years of engineering have I seen the same part number used for two different sized parts.

Does this surprise other people or has this ‘snippet’ just passed me by?

[bernard towersParticipant @bernardtowers37738]

Aernt you changing the part no when you add 2RS or ZZ to it?

[Peter_H]

On 10 May 2025 at 13:12 Peter_H Said:

So, according to my parts manual I need a Hoffmann S9 7/8″id x 1.7/8″od x 3/8″ bearing. Found that KLNJ7/8 is the replacement, ordered a cheapo one from ebay and it arrives with a width of 1/2″ not 3/8″. After a lot of hunting I have found that the KLNJ7/8 replacement part is 3/8″ wide as an open bearing, but 1/2″ wide when it is a -2RS or -ZZ. Never in 50 years of engineering have I seen the same part number used for two different sized parts.

Does this surprise other people or has this ‘snippet’ just passed me by?

Is the original bearing 3/8″ wide and NO seals.

If so, surely if you ask for KLNJ7/8, that’s exactly what you should receive..

[Author]

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