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MSD supplies rotary bit subs and adapters in pin-to-pin, pin-to-box, and box-to-box configurations. Compare connection descriptions, O.D. × I.D., and working length for drill-string matching.
MSD rotary bit subs and adapters are grouped into pin-to-pin, pin-to-box, and box-to-box configurations. The current tables compare the connection description for both ends, O.D. × I.D., and working length, allowing the required adapter arrangement to be checked against the mating rotary drill-string components.
| Description | O.D. × I.D. | Working Length |
|---|---|---|
| 2 3/8" IF Pin to 2 3/8" IF Pin | 3 1/2" × 1 1/2" | 3" |
| 2 7/8" FEDP Pin to 2 7/8" FEDP Pin | 4" × 1 3/4" | 3 1/2" |
| 2 7/8" IF Pin to 2 7/8" IF Pin | 2 1/4" | |
| 2 7/8" IF Pin to MR Pin | 4" × 1 1/2" | 2 1/2" |
| 3 1/2" IF Pin to 2 3/8" IF Pin | 12" | |
| MJR Pin to MJR Pin | 2 1/2" × 1 1/4" | 3 1/2" |
| MR Pin to MR Pin | 3 1/4" × 1 1/2" | 3 1/4" |
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Read MoreRotary bit subs and adapters are connection components used within a rotary or tricone drill-string arrangement. This page covers the adapter configurations listed for matching two connection endpoints; it does not cover the separate selection of rotary drill pipes, tricone bits, stabilizers, shock absorbers, or DTH adapter subs.
Selection should begin with the two components that must be joined. Their connection forms and exact thread descriptions determine which listed rotary sub adapter can be reviewed. A general product name or a single nominal size does not confirm the required configuration.
The current product range is organized into pin-to-pin, pin-to-box, and box-to-box adapters. These groups identify the connection arrangement at the two ends. Within each group, the tables list the complete connection description together with O.D. × I.D. and working length.
The published configurations include listed IF, FEDP, MJR, MR, and API Reg. connection descriptions in specific combinations. These names and sizes must be checked exactly as shown for both ends. Similar abbreviations, the same nominal size, or the same pin or box form do not by themselves establish thread compatibility.
For a rotary drill-string requirement, identify the connection on the drill-pipe side and the connection on the tricone-bit or adjoining-component side before selecting an adapter. Confirm which end requires a pin and which requires a box, then compare the complete connection description, O.D. × I.D., and working length with the available configurations.
For replacement rotary bit subs, use the existing product markings, measured dimensions, both-end connection details, photographs, and drawings where available. The mating components should also be identified. This information provides a clearer basis for matching than a generic bit-sub description or an assumed connection based on appearance.
For technical confirmation and quotation, provide the required adapter type, the exact connection required at each end, the two mating rotary drill-string components, required O.D. × I.D. and working length where specified, and the required quantity. For replacement requirements, also provide existing markings, measurements, photographs, drawings, or a sample reference where available.
MSD can compare the supplied connection information with the published pin-to-pin, pin-to-box, and box-to-box configurations and identify details that require separate confirmation before ordering.
Technical content reviewed by MSD Engineering Team. | MSD — 23+ years of rock drilling tools manufacturing expertise | ISO 9001 Certified | Exporting to 40+ countries
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