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At my work we use IDC headers and cable terminators a fair bit, and we've noticed that most headers have a gap on the sides (see image below). It looks like a clip would grab the gap nicely, but have never seen any cable terminators with any such thing. My question is why might the gap be there?

2×5-pin IDC header (box-shape shroud? with pins poking up internally) showing two rectangular gaps on the side

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  • \$\begingroup\$ @TonyEErocketscientist no, you're looking at the wrong gap. OP said the gaps on the sides, which are for retention clips, as Ignacio pointed out in his answer. Read the whole question otherwise you could have caused more confusion! \$\endgroup\$
    – MCG
    Commented Jul 18, 2018 at 7:54

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They're for retainer clips, but almost no one ever uses them these days. If additional retention is required then special headers with clips on the side are used instead.

page 5

50-pin IDC retaining clip

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