The difference is hexagon nut of M2 size/0.4mm pitch
In "M2", "M" stands for metric nut and "2" after "M" stands for thread diameter.
(71) : Without nuts, our standard
(91) : With nuts
In "M2", "M" stands for metric nut and "2" after "M" stands for thread diameter.
(71) : Without nuts, our standard
(91) : With nuts
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