What are Serrated Terminals?

Interconnect
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Serrated or dimpled wire barrels provide maximum contact and tensile strength after crimping. The ridges provide additional wire retention.

Serration Examples

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Lugs, Quick Connects, Quick Disconnect Connectors, Ring Connectors, Spade Connectors, Wire Pin Connectors, & Wire Splice Connectors may offer this feature.
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Source - https://www.te.com/en/products/terminals-splices.html#:~:text=Serrated%20or%20dimpled%20wire%20barrels,in%20proper%20terminal%2Dwire%20match.