Service connector

A downhole tool, comprising:

• a mandrel having first and second opposing ends and an outer mounting surface, the first end comprising a male threaded portion;
• a tool component mountable on the mounting surface by sliding said tool component onto the outer mounting surface from the first end of the mandrel;
• a load sleeve defining a torque shoulder, wherein the load sleeve is mountable on the mandrel and securable adjacent the male threaded portion of the first end of the mandrel such that the torque shoulder and the male threaded portion define a pin connector to facilitate connection with a box connector of a separate component;
• and,
• a locking assembly locatable between the mandrel and the load sleeve, wherein the locking assembly comprises a split sleeve comprising two half-sleeves, an inner surface of each half-sleeve comprising a plurality of grooves or ridges arranged to form a castellated profile, and the outer mounting surface comprising a corresponding plurality of grooves or ridges arranged to form a complimentary castellated profile, such that when the load sleeve is mounted on the mandrel and the separate component is engaged on the pin connector, the grooves or ridges of the inner surface of each half sleeve of the locking assembly and the complimentary grooves or ridges of the outer mounting surface are urged into engagement with one and other, with the grooves or ridges of each half sleeve, the corresponding grooves or ridges of the outer mounting surface, load sleeve and separate component preventing the half-sleeves of the locking assembly from separating from the mandrel.