Sucker Rod and Polished Rod Couplings - API 11B
Penguin manufactures Sucker rod couplings, Sub couplings and Polished rod couplings in varying sizes of 5/8,
3/4, 7/8, 1-1/8 inches dia. meeting or exceeding the requirements of API Spec 11B. Couplings and Sub couplings
are available in alloy steel AISI 4130/8630 grades and are effectively heat treated to meet or exceed mechanical
properties as specified in API 11B. All couplings are precision CNC machined to maintain the perpendicularity of
coupling face to coupling axis to ensure proper friction sealing while making up with sucker rods.