The 6" UltraCon® SS4 is the longest hex head concrete screw we stock, for fastenings where the fixture stack eats the embedment — doubled ledgers, thick furring over uneven block, stacked shim packs, and treated plates over rigid insulation. Subtract your full fixture thickness from the 6" length to find your working embedment, and plan on at least 1" of thread in the base material. If you have more embedment than the job needs, the 5" Crete-Flex® costs less, and the standard hex head lengths cover most direct-to-slab work.
Check the bit size before you swap lines. This UltraCon® SS4 takes a 3/16" carbide bit; the Crete-Flex® equivalent at this diameter takes 7/32". The two are interchangeable by fit, not by hole preparation.
410 stainless suits exterior and high-moisture work and far outlasts plated carbon steel, but it is not a marine-grade alloy. For direct salt spray, splash zones or submerged work, use a 316 stainless concrete screw.
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