The difference is packaging and tape for vacuum.
Part number : Packaging / Tape for vacuum
FX6-**P-0.8SV1(71) : Tube(Magazine,stick) / Without tape
FX6-**P-0.8SV1(89) ...
The packaging of A4B-**PA-2***(51) is bag,
its order unit is piece and order quantity is multiple of 100 pcs.However, A4B-**PA-2***(71) has been discontinued already.
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