Steelcraft does not manufacture 12 gage closed section mullions. The maximum is 14 gauge.
Steelcraft can provide the outer perimeter (open sections only) of a transom frame in 12 gage material. If a transom bar is required it would be fabricated as a 14 gage mullion.
12 gage frames are furnished with equal 1 15/16" rabbets and 3/4" high stops as standard in jamb depths 5 3/4" and larger. jamb depths under 5 3/4" are furnished unequal rabbet
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