3-1/2IN External Thread Crossover Introduction 3-1/2IN External Thread Crossover is a tubing or casing for connecting two different sizes, threads and weights. Specification Size 3-1/2IN External Thread Crossover Material Grade J55/K55/N80/L80/P110/L80-13Cr/SUPER 13CR Thread Type EUE\NUE\STC\LTC\BTC\Premium Connection Length 300mm-600mm Standard Reference API 5CT&API 5B Product Description Models Features 2-3/8"EU*2-7/8"EU 1.External thread 2.Reducing coupling 3. Having Good Sealing Property 2-7/8"NU*3-1/2"NU 3-1/2"NU*3-1/2"EU 2-3/8"NU*2-3/8"EU 2-7/8"NU*2-7/8"EU 2-3/8"EU*2-7/8"NU 1. Grade: J55, K55, N80-1, N80-Q, L80, C90, P110 2. We also supply permium thread products by customer' s request 3. Size: tubing coupling from 1.9" to 4-1/2" , Casing coupling fro4-1/2" to 13-3/8" 4. Type: NU, EU(tubing coupling), STC, LC, BTC(casing coupling). 5. Surface treatment: Whole phosphating, or inside phosphating and outside coating 6. Packing: By carton, wooden case, wooden pallet, or by requirements of customers