Male 10 x 1.25mm Metric Concave Seat to 3AN Male, Steel

This steel brake adapter has a male 10x1.25mm inverted flare (concave) fitting on one end and a 3AN male (3/8-24, 37° convex) on the other end. Sold individually.

This part has a large enough hex (9/16") to be used with a crush washer (sold separately) when sealing the either the 3AN side or the metric side against a flat faced port.

Convex vs Concave