Brake pipe nut is made of high strength steel, and its surface is coated with anti-corrosion layer. Yharnamite 12 Pcs Brake Line Fittings, 3/8-24 Threads Brake Line Brake Pipe Fittings 12 Pcs 3/8' - 24 Threads Assortent Brake Line Fittings For 3/16' Brake 3/16 Brake Line Fittings About this item The joint and nut are metric 3/8-24 threads (conventional 3/16 inch pipe fitting size). Size:The threads are 3/8 inch with a thread pitch of 24. Material: brake pipe union is made of pure copper with high strength. Brake pipe nut is made of high strength steel, and its surface is coated with anti-corrosion layer. Suitable for 3/16 inch SAE inverted bell mouth and double bell... The joint and nut are metric 3/8-24 threads (conventional 3/16 inch pipe fitting size). Find many great new & used options and get the best deals for Tnisesm 12Pcs 3/8"-24 Threads Brake Line Fittings Assortment For 3/16" Copper at the best online prices at 3/16 Brake Line Fittings: 12 Fittings for 4 x 3/8-24 threads unions; 8 x 3/8-24 threads nuts.