On all subs (such as kelly sub, x‐over drill pipe to drill collar, x‐over drill collar to drill collar, bit sub, etc.) please specify so we can give you the correct bevel diameter.
- Overall length
- Largest diameter
- Size & type of connections, indicating pin or box, & special joint features such as bore back or stress relief groove.
On reduced section subs add the following specifications:
- Diameter of reduced section
- Length of reduced section: 18 or 24 inches
On bit subs add the following specifications:
- Float bore, size and type