The round pin/female headers (machine pin/female headers) typically provide a more secure fit, with more contact surface area between the pins and sockets.

Machine Female header
2.0 Machine Pin Female Header - Round pin H2.8 Single row - Right angle SMT Type - No.Y00116-Z-SMT-2.8
Y00116-Z-SMT-2.8
1.27 Machine Female Header - Round pin H3.8 - Dual rows SMT Type - No.Y03624-M-SMT-3.8
Y03624-M-SMT-3.8
2.54 Pitch Machine Female Header - Round pin H3.0 Right angle Dual row - No.Y03620-R-RA-3.0
Y03620-R-RA-3.0
2.54 Machine pin Female Header - Single row Round pin H3.0 L7.4 - Horizontal SMT - No.Y03621-Z-SMT-3.0
Y03621-Z-SMT-3.0
2.54 Pitch Straight Female Header - Single row Round pin H3.0 L17.8 - No.Y03622-S-DIP-3.0
Y03622-S-DIP-3.0
2.54 Pitch Machine Pin Female Header - Round pin H3.0 L17.85 Straight Single row - No.Y03623-S-DIP-3.0
Y03623-S-DIP-3.0
2.54 Machine female header - Round pin H3.0 L7.43 Straight Single row - No.Y03625-1S-DIP-3.0
Y03625-1S-DIP-3.0
2.54 Pitch Machine pin female header SMT Socket - H3.0, L7.4 dual row - No.Y03626-M-SMT-3.0
Y03626-M-SMT-3.0
2.0 SIP Socket, Straight, H2.8, L9.4 Single row - No.Y00116-S-DIP-2.8
Y00116-S-DIP-2.8
2.54 SIP Socket Connector - H7.0 Single row Straight - No.Y00109-1S-DIP-7.0
Y00109-1S-DIP-7.0
 

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