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1.2 Cone surface and cone surface metal main seal and inner shoulder metal secondary seal, so that the joint has good air tightness;
1.3 The stepped double straight shoulder structure makes the joint have good anti-torsion and bending ability, and is beneficial to protect the main seal;
1.4 The circumferential stress on the joint is lower, which helps prevent stress corrosion cracking.2. Fox thread (co-developed by Kawasaki Steel in Japan and Hunting in the UK).
4. SEC thread (designed and produced by Siderca, Argentina)