Cross-Over Sub – 4-1/2 IF Box X 5-1/2 full hole pin
A 4-1/2″ IF (Internal Flush) Box x 5-1/2″ Full Hole (FH) Pin crossover sub is a specialized drilling component used to connect drill string components with these specific, differing thread types and sizes. Typically manufactured from 4145 HT steel, these subs are commonly used as savers or adapters in drilling operations.
Key Specifications & Features:
Top Connection: 4-1/2″ IF Box (Female)
Bottom Connection: 5-1/2″ Full Hole Pin (Male)
Material: 4145 High Tensile (HT) Alloy Steel
Length: Commonly 16 inches
Features: Often includes 2-1/4″ ID bore and optional wrench flats for handling.