Subs and collars are an important part of everyday drilling – quality of the materials used in those subs is even more important. Whether you need 4145 Steel or Non-Mag, SMS can provide you with precision machined subs and collars made from high quality material. We stock a variety of sizes from 3 1/2 ” – 9.5” and welcome custom designs. Sale and rental options available.
All SMS subs are manufactured to API standards. Material certifications available upon request.
SMS Subs/Collars