What does the (N) indicate on part number SYM-001T-P0.6 (N)?

As an internal JST reference to control FIFO inventory, the (N) was applied to indicate a change in the quantity per reel from 7,500 pieces to 8,500 pieces.

The data sheets, product specifications and drawings will not indicate this internal reference though it is likely to be shown on the package labeling, packing lists and invoices to customers who purchase this item.

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Difference in contact part numbers

What is the difference between SHF-001T-0.8BS and SHF-001T-0.8SS?

The difference is the base material. The contact suffixed with "BS" is the standard Phosphor Bronze material. The "SS" indicates Brass material.