BSW (British Standard Whitworth) – The British ThreadFlank angle: 55°Profile: Cylindrical Whitworth threadTypical size: e.g. 5/16" BSW (18 threads per inch)Widely used on older machinery, classic cars, and in plumbing applicationsAlso known as the English standard threadQuick Reference – Common BSW SizesNominal SizeThreads per Inch1/4" BSW205/16" BSW183/8" BSW16Important: BSW is a cylindrical thread, not to be confused with tapered pipe threads like BSPT.The Three Design Types – For Every Installation SituationBesides the thread, the design type determines practical usability:Straight – the classic choice for easily accessible lubrication points45° angled – for locations with limited side clearance90° angled – the solution for extremely tight installation spacesAll three angled versions are available with BSW thread.In a NutshellBSW is the thread of choice for British and older machineryA specification like "5/16" BSW, 90°" clearly defines both thread type and designAlways verify whether your equipment uses BSW or the similar BSF (British Standard Fine)A small but well-stocked inventory of common BSW grease fitting variants saves time and ensures that maintenance work can be completed quickly and with the perfect fit.Available at www.zoll-schrauben.ch – powered by Equipe Bachofner GmbH
