Relates to seals suitable for shafts from 6 mm to 400 mm diameter and accompanying housings from 16 to 440 mm. Not normally suitable for high pressure.
BS 7780-1:1994 history
2008BS ISO 6194-1:2008 Rotary shaft lip-type seals incorporating elastomeric sealing elements - Nominal dimensions and tolerances
1994BS 7780-1:1994 Specification for rotary shaft lip type seals - Nominal dimensions and tolerances