From Phil Wood:
Phil Woods stainless steel
track cogs are available in 1/8″ and
3/32″ widths, from 12 to 22 teeth. The cog threading is
1.370″ x 24
tpi. Our track cogs are manufactured from solid stainless steel bars
and are heat-treated three separate times. In order to show that our
cog is not plated, we polish and laser etch the outer face of each cog
while leaving the inside face in its natural
state.
We recommend our track cogs for use with our track hubs, as
they are
machined to work together seamlessly. Other track cogs on the market
often have varied widths, sometimes resulting in a cog that is too wide
for the threads on our track hubs which can lead to less than complete
engagement of the lock ring and thread stripping from the hub.