The function of SEC62 (SEC62 preprotein translocation factor, Ensembl gene identifier ENSG00000008952) is as follows. Mediates post-translational transport of precursor polypeptides across endoplasmic reticulum (ER). Proposed to act as a targeting receptor for small presecretory proteins containing short and apolar signal peptides. Targets and properly positions newly synthesized presecretory proteins into the SEC61 channel-forming translocon complex, triggering channel opening for polypeptide translocation to the ER lumen. {ECO:0000269|PubMed:22375059, ECO:0000269|PubMed:29719251}.