  We propose Type IIB 5-brane configurations that engineer the 6d
$\mathcal{N}=(1,0)$ SCFTs with $SO(N)$ gauge symmetry coupled to a single
tensor multiplet on a circle, by considering RG flows on Higgs branches of
$D$-type conformal matter theories. We test the brane systems against known
Calabi-Yau threefolds for the 6d SCFTs on a circle. In addition we study a new
RG flow involving Higgs vevs of scalar operators with Kaluza-Klein momentum
along the circle. The new RG flow results in the 5-brane webs for the 6d SCFTs
of $D_N$ gauge symmetry compactified on a circle with $Z_2$ outer-automorphism
twist.
