571-521384-4 PL R/A RAST5 Header TE Connectivity 571-521384-4 PL R/A RAST5 Header is a shrouded, straight pin, through hole, right angle header with 4 positions in 1 row with a 5mm pitch. 571-521384-4 has a nylon housing material, brass contacts and a flammability rating of UL 94 V-0.