The Amphenol 91276-421HLF is a 21-position unshrouded pin header from the BERGSTIK® II series, built on the standard 0.100" (2.54 mm) pitch. This is a single-row, through-hole, male-pin header with all 21 positions loaded — no skipped pins. It's the kind of workhorse header you'd reach for when you need a reliable board-to-board interconnect on a legacy footprint, or when you're building a test fixture that needs to mate with a standard 0.100" IDC or crimp receptacle. The unshrouded design means the pin row is fully exposed, so the mating half — typically a socket strip or a ribbon-cable IDC connector — provides its own alignment and polarization.
That 5 A is a per-contact rating at ambient — in a dense harness or at elevated cabinet temperature, you'd derate per the manufacturer's curve. The 0.100" pitch gives you a standard 2.54 mm grid footprint, which means it drops onto any board laid out for the classic DIP or Berg strip pattern. No surprises on the board layout side. Tin-on-tin contacts are the standard choice for cost-sensitive, moderate-cycle applications; they don't have the corrosion resistance of gold, but in a clean indoor environment they'll outlast the equipment. The overall contact length is 1.225" (31.12 mm), with a 0.900" (22.86 mm) mating length and a 0.225" (5.72 mm) solder tail.