| width = 12 mm (A-plug),<ref name=a-plug-size>{{ref-web |títol= USB ‘A’ Plug Form Factor Revision 1.0 |url= http://www.usb.org/developers/devclass_docs/CCWG__A__Plug_Form_Factor_Guideline__Revision_1.0_.pdf |editor= USB Implementers Forum |pàgina= 1 |format= PDF |data= 23 març 2005 |consulta= 4 abril 2012 |citació= Body length is fully 12mm in width by 4.5mm in height with no deviations |arxiuurl= https://web.archive.org/web/20120914014307/http://www.usb.org/developers/devclass_docs/CCWG__A__Plug_Form_Factor_Guideline__Revision_1.0_.pdf |arxiudata= 14 de setembre 2012 }}</ref> 8.45 mm (B-plug); 7 mm (Mini / Micro-USB)
| height = 4.5 mm (A-plug),<ref name=a-plug-size/> 7.78 mm (B-plug, pre-v3.0); 1.5–3 mm (Mini/Micro-USB)
