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B.S. Frame Designations
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British Standard Frame Top bars

Tolerances are + 0.1 mm
Material... Most softwoods are suitable, but the type 2A and type 2B were always made in hardwood for extra strength and resistance to warping.

Standard Top bars... upper is the alternative type, lower is the original 'standard' type.

British Standard bee hive frame, Top bars Drawing

Apex type 2B Top bar

APEX Type 2B Topbar compatible with B.S. frames

In order to limit the places where wax moth could pupate, the central groove did not run to the ends, but finished at a point that was covered by the sidebar.

Apex type 2A Top bar

APEX Type 2A Cut Comb Topbar

This 2A type was manufactured in two forms... The one shown here was used for cut comb production. The other type (future link) was without a groove, had drilled holes and was used to mount pairs of half width breeding frames for use in full sized brood boxes.

Top bar for drone frames

drone frame top bar

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Written... Summer 2000, Revised... 03 October 2001, Revised... 20 August 2002, Revised... 07 June 2003,

B.S. Frames icon Coding Standard 2003 Issue 2