HSM-1 is a versatile high performance non upset premium coupling connection with extra gas tightness properties and excellent structural strength, suitable for use in a combination of environments and well conditions。
size range: 2-3/8″～13-3/8 ″
l Threaded and coupled connection
(1)Threaded and coupled connection, coupling critical cross sections greater than those of the pipe body and the coupling covers the vanishing threads, Joint efficiency is more than 100%;
l Improved buttress thread form:
(1) Improved buttress thread form with a taper of 1:16，easy stabbing without cross-threading and fast trouble-free make-up.
2 3/8"-2 7/8" 8TPI
3 1/2"-4 1/2" 6TPI
5" and over 5TPI
(2) Box and pin different thread height design, clearance between the pin thread crest and box thread root avoids the trapping of compound inside the threads.
l Tapered metal-to-metal seal
（1） Tapered metal-to-metal seal, offers excellent gas tightness with high contact pressure and long contact length ; minimizing galling risks during make up，preserving seal integrity after repeated make-ups and break-outs。
(2) Seal is generated by radial interference, reducing the effects of tensile load. Seal mechanism energized by internal and external pressure.
l Reverse angle torque shoulder
（1）The wedge effect created by the reverse angle improves the structural strength of the connection.
（2）internal torque shoulder provides positive stop and effective protection against overtorquing.
l Internal flush design。
Internal flush design reduces the gas and liquid turbulence and minimizes the energy loss in the pipe.
l Special clearance coupling
Special clearance coupling option is available on request.
Superior structural strength
Excellent resistance to galling
Production tubing and casing