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Rotary subs are made from material 4145 H heat treated to drill collar specifications.

All connections are protected by a phosphate surface coating to minimize galling on

initial make up. When subs are ordered to conform to API standards .

How to order : When ordering or requesting quotations on rotary subs, please specify:

On all subs:

  • Identify sub use (example: kelly sub x-over drill pipe to drill collar, x-over drill collar to drill collar, bit sub, etc.)
  • Overall length
  • Largest diameter
  • Bore ID
  • Size & type of connections, indicating pin or box, & special joint features such as bore back or stress relief groove.

On bit subs :add float bore, size and type , if required.

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