Box-Box Adapters

Thread Size Length C (mm) Length J (mm) Width E (mm) Diameter d (mm) Outside Diameter Flat F (mm)
Thread A Thread B D1 (mm) D2 (mm)
API 2 3/8*REG API 2 3/8*REG 219 57 51 38 89 89 70
API 2 7/8*REG API 2 3/8*REG 219 70 51 38 114.5 89 98.5
API 2 3/8*REG API 2 1/2*REG 128.6 57 51 38 89 114.5 70
API 3 1/2*REG API 3 1/2*REG 241.3 70 51 44.5 114.5 114.5 98.5
API 3 1/2* REG API 4 1/2*REG 269.8 89 51 59 114.5 146 98.5
API 2 7/8*REG API 3 1/2*REG 241.3 70 51 44.5 114.5 52 98.5
API 4 1/2*REG API 2 7/8*REG 250.8 76 51 44.5 114.5 146 98.5