Fukuoka Sukesada (助貞) is traditionally transmitted as the son of Sukezane (助真) and is recorded in sword compendia as active "around Bun'ei" (c. 1264-1275), placing him squarely in the mid- period. Some references also record a Sukesada active around the Tokuji era as a descendant of Yukikuni. The school was a major lineage that flourished in Province from the early period through the period, prospering in such localities as Fukuoka, Yoshioka, and Iwato, and Sukesada's workmanship closely resembles that of his father Sukezane.
Sukesada's surviving preserve the elegant characteristic of the mid- period, with slender construction, high , and . The forging shows tightly packed with and , and vivid standing out clearly. The is a into which , , , and other elements are intermingled, producing a brilliant, highly varied, and exuberant in the characteristic manner of mid- Fukuoka work. The temper shows a shallow -flavored quality with profuse and , deep , and well-adhering ; the is clear (). Some examples exhibit a (subdued) tendency in the with adhering.
Signed by Sukesada are exceedingly rare, and for this reason his works possess high value as documentary source material. The characters of his signature bear a resemblance to those of Sukezane, and his blades have historically been mistaken for Sukezane's work. The has affirmed that Sukesada displays a style in which both and are notably clear, and that his works constitute important material for future research into the Fukuoka group. Several surviving retain tang condition, which is especially desirable, and both and are superbly preserved.