Sealey Brake Pipe Nut 7/16"UNF x 20tpi Male 1/4" Pipe SAE Form Pack of 10. This brake pipe fitting features a 1/4" pipe size and a 7/16"UNF x 20tpi thread size. It is a male type with SAE flare and comes in a pack of 10. Model No. BN71620. Weight 0.09kg.