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Pipe Fittings · MSS SP-43 / manufacturer standard

Lateral — MSS SP-43 / manufacturer standard

Lateral — a fitting with a 45° branch. Laterals bring in a branch at 45°, reducing turbulence and pressure drop compared to a tee. Common in drainage, slurry and process lines.

  • MSS SP-43 / manufacturer standard
  • 22 grades
  • EN 10204 3.1 / 3.2

Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026

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Lateral: What to Know Before Ordering

  • 45° branch
  • Equal and reducing
  • Often fabricated
R = 1.5 D (LR)centre-to-end Abevelled ends to ASME B16.25
TYPE · LATERALDIM · MSS SP-43 / manufacturer standard22 GRADESKANAK STEEL

Lateral Materials & Grades

GradeMaterial standardBest for
Inconel 825 lateralASTM B366 WPNICMCSulphuric and phosphoric acid service, chloride stress-corrosion cracking and sour gas
SS 904L lateralASTM A403 WP904LDilute sulphuric acid, phosphoric acid and chloride-bearing cooling water
SS 304 lateralASTM A403 WP304General corrosion resistance, food, water and architectural work
SS 304L lateralASTM A403 WP304LWelded tanks, piping and vessels in general corrosive service
SS 310 / 310S lateralASTM A403 WP310SFurnaces, burners and heat treatment at high temperature
SS 316 / 316L lateralASTM A403 WP316LChloride-bearing process fluids, marine air and pharmaceutical service
SS 321 lateralASTM A403 WP321High-temperature service between 425 and 815 °C
SS 347 lateralASTM A403 WP347Welded high-temperature piping in refineries and power plants
Duplex 2205 lateralASTM A815 WPS31803 / WPS32205Strength with chloride resistance at a stainless-steel budget
Super Duplex 2507 lateralASTM A815 WPS32750Seawater and high-chloride service where strength also matters
Inconel 600 lateralASTM B366 WPNCIHigh-temperature oxidation, caustic and nuclear service
Inconel 625 lateralASTM B366 WPNCMCSeawater, high strength and high temperature in one alloy
Inconel 718 lateralMachined from B637 on requestVery high strength at temperatures up to about 650 °C
Incoloy 800 / 800H / 800HT lateralASTM B366 WPNICFurnaces, petrochemical heaters and high-temperature piping
Hastelloy C276 lateralASTM B366 WPHC276The most aggressive mixed acids, wet chlorine and hypochlorite
Hastelloy C22 lateralASTM B366 WPHC22Mixed oxidising and reducing acids, and weld overlays
Monel 400 lateralASTM B366 WPNCSeawater, hydrofluoric acid and marine service
Super Duplex S32760 lateralASTM A815 WPS32760Seawater firewater, injection and offshore piping
ASTM A106 Gr B lateralASTM A234 WPBHigh-temperature process and steam piping in refineries and power plants
ASTM A333 Gr 6 lateralASTM A420 WPL6Cold-climate and refrigerated piping down to −45 °C
ASTM A335 P11 lateralASTM A234 WP11Steam and hot-oil piping up to about 550 °C
ASTM A335 P22 lateralASTM A234 WP22High-pressure steam and hydrogen service up to about 580 °C

Other pipe fittings

ElbowA fitting that changes the direction of a pipe run.TeeA fitting with a 90° branch that splits or combines flow.ReducerA fitting that joins two pipes of different sizes.CapA fitting that closes the end of a pipe.Stub endA short pipe length with a flared lap that works with a lap joint flange.CrossA four-way fitting with branches at 90°.BendA pipe bend with a larger radius than a standard elbow.CouplingA short forged fitting that joins two pipes.UnionA three-piece forged fitting that joins pipes and can be taken apart.NippleA short length of pipe, threaded or plain, used to connect fittings.PlugA threaded fitting that closes a female connection.

Lateral — questions buyers ask

When is a lateral better than a tee?

Where lower turbulence matters — slurries, solids and gravity drainage.

Which grades are laterals available in?

Inconel 825, SS 904L, SS 304, SS 304L, SS 310 / 310S, SS 316 / 316L, SS 321, SS 347, Duplex 2205, Super Duplex 2507, Inconel 600, Inconel 625, Inconel 718, Incoloy 800 / 800H / 800HT, Hastelloy C276, Hastelloy C22, Monel 400, Super Duplex S32760, ASTM A106 Gr B, ASTM A333 Gr 6, ASTM A335 P11, ASTM A335 P22.

Which standard covers lateral dimensions?

MSS SP-43 / manufacturer standard. The material standard depends on the grade.

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