M&M International offers a wide variety of drill stem subs to suit the needs of our customers. Our subs are designed and manufactured to meet API 7-1, unless individual customer specifications are required. Subs are available in all thread and end connection types.

Drill Stem Subs

Crossover Subs

Standard Saver Subs

Top Drive Saver Subs

Splined Top Drive Saver Subs

Test Subs

Lift Nubs

Padeye Subs

Square or Tapered Shoulder Lift Subs

Water Bushings

Bit Subs


Our Emergency Control Sub (“EC-SUB™”) is inexpensive insurance against costly pack-off and lost circulation events, while always allowing access to LWD nuclear sources.

The EC-SUB™ is multi-functional for diverse drilling applications, as it can split flow, isolate LCM, activate instantly, and has a rugged shutoff mechanism.


Integral Single & Double Side-Entry Subs

M&M stocks the large rough forgings we use to make our single and dual side-entry subs. Forgings create a stronger product than normal hot-rolled bar. Making side-entry subs from forgings results in shorter lead times because it allows manufacturing to begin when the material is closer to its finished size while removing the need for post heat treating.

Our integral double side-entry sub does not have a through bore that runs from the box connection to the pin connection; this isolates the two connections allowing for testing in either direction independent of the other.

Our integral side-entry subs are preferred over welded non-integral side-entry subs due to their quality and strength. With ample room for recuts and your choice of hammer union, these subs are good for years of service.

Custom options are possible with these products.

The REF™ Side Entry Sub (Patent Pending)

While flanged side entry sub designs have existed in the field for years, they have inherent safety concerns and other limitations. M&M International has addressed these issues with our Re-Engineered Flanged Side Entry Sub (“The REF™”).

With a safer, more versatile design than competing flanged subs, and in most cases a lower price tag than integrals, The REF™ is a game changer for the industry.

The REF Info

Pump In Subs & Circulating Swages

M&M offers pump in subs and circulating swages made to order with your choice of hammer union and end connection.