BS 2061

BS 2061 specifies phosphor bronze spring washers for general engineering. It includes single-coil square-section, single-coil rectangular-section and double-coil washer schedules.

Line drawing of a split spring washer in top and side views with inside diameter, outside diameter, wire width and thickness marked.

Washer forms and dimension references

Washer form	Section	Dimension references
Single coil	Square section	Nominal bolt size, inside clearance, outside diameter, section width and thickness
Single coil	Rectangular section	Nominal bolt size, inside clearance, outside diameter, section width and thickness
Double coil	Square or rectangular wire form	Nominal bolt size, clearance and coil dimensions

Drawing dimensions

Symbol	Dimension	Unit
Dᵢ	Inside diameter	Inch series
Dₒ	Outside diameter	Inch series
w	Wire section width	Inch / wire gauge
t	Wire section thickness	Inch / wire gauge

Note: BS 2061 is an inch-series standard. The numerical dimensions depend on the nominal washer size and coil form; use the matching table in the complete standard for production values.