Length: Ranges from 1 to 20 feet, typically 5, 10, or 15 feet. Diameter: Common sizes are from 3.5 to 8.25 inches. Connection Types: Combines two different types or sizes of connection, typically one box and one pin. Material: Usually made of heat-treated, high-strength alloy steel. Hardbanding: Often included for extra wear and corrosion resistance. Pressure Rating: Intend for high-pressure drilling conditions. Standards: Manufactured to API specifications for compatibility with other drill string components. Read more
Crossover sub is mainly used to connect upper and lower drill tools into different connectors in drilling operations. Also, it can be used to protect other tooling in the drill stem (called saver sub) or be used to deliver outgoing air to the bit face just above the bit (called bit sub).
The length of crossover subs is generally measured from shoulder to shoulder. Typical lengths range from 6" - 28" long going up in increments of 2 inches with AISI 4145H, AISI 4145H Mod, AISI 4340, AISI 4140-4142 and Non-magnetic material. All connections are phosphate-coated or copper-plated to improve resistance to corrosion. Crossover subs come in three basic types: A Pin (male) * Box (female); B Pin (male) * Pin (male); C Box (female) * Box (female)
| Specifications | Descriptions |
|---|---|
| Crossover sub Description UpperConnection part Lower Connection Part Type Kelly cross-over sub Kelly Drill pipe A or B Drill pipe cross-over sub Drill pipe Drill pipe A or B Interim cross-over sub Drill pipe Drill collar A or B Drill collar cross-over sub Drill collar Drill collar A or B Drill bit cross-over sub Drill collar Drill bit A or B Swivel cross-over sub Swivel lower sub Kelly C Fishing cross-over sub Kelly Drill pipe C Drill pipe Fishing tools C |
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