Threaded Tee

Threaded Tee Pipe Fittings

A Threaded Tee is a three-way pipe fitting that allows for a 90° branch from the main run. It has three female threaded openings, enabling easy assembly and disassembly of piping without welding. Threaded Tees are widely used in small-diameter piping systems where tight, leak-proof connections are critical.

Stainless Steel Threaded Tee
Stainless Steel Threaded Tee
Carbon Steel Threaded Tee
Carbon Steel Threaded Tee
FeatureThreaded Tee Description
PurposeConnects three pipes, forming a 90-degree branch to divert or combine flow in a piping system.
StandardsASME B16.11, BS 3799, ISO 4144, ANSI/ASME B1.20.1 (NPT), BSPT, BSPP
Size Range1/8″ to 4″ (NPS)
Pressure ClassesClass 2000, 3000, 6000, 9000
Thread TypesNPT (National Pipe Thread), BSPT (British Standard Pipe Taper), BSPP (British Standard Pipe Parallel), PT, PF
Types– Equal Tee: All three ends have the same diameter. – Reducing Tee: Branch or run ends have different diameters.
Materials– Stainless Steel: ASTM A182 F304, F316, F316L, F321, F347, F904L – Carbon Steel: ASTM A105, A350 LF2 – Alloy Steel: ASTM A182 F5, F9, F11, F22, F91 – Duplex/Super Duplex: ASTM A182 F51, F53, F55 – Copper Alloys: ASTM SB 111 (C10100, C10200, etc.) – Nickel Alloys: Inconel, Monel, Hastelloy – Others: Brass, Malleable Iron, Cast Iron
Applications– Oil & gas, petrochemical, chemical processing, plumbing, HVAC, water supply, power plants – Suitable for small-diameter, high-pressure systems (NPS 2 or smaller) – Used in pipelines requiring branch connections for fluid or gas distribution
Connection TypesThreaded (Female/Female, or Female/Female/Male for special configurations)
Key Features– Provides smooth flow distribution or combination – Easy to install and disassemble for maintenance – Corrosion-resistant materials (e.g., stainless steel, brass) for harsh environments – Reducing tees allow connection of different pipe sizes
Common Issues– Pressure losses due to turbulence at the junction – Potential wear with abrasive media – Threaded connections may require proper sealing to prevent leaks
Sealing TypesNPT (60° thread angle, tapered), BSPP (parallel threads), BSPT (tapered)
Typical IndustriesOil & gas, chemical processing, plumbing, HVAC, marine, agriculture, food & beverage

Threaded Tee Dimensions

Class 2000

NPSMin Length of ThreadOutside Dia of Band
D		Center to End
A		Min
WT
BJ
1/210.913.633283.18
3/412.713.938333.18
114.717.346383.68
1.1/4171856443.89
1.1/217.818.462514.01
21919.275604.27
2.1/223.628.992765.61
325.930.5109865.99
427.7331461066.55

Class 3000

NPSMin Length of ThreadOutside Dia of Band
D		Center to End
A		Min
WT
BJ
1/210.913.638334.09
3/412.713.946384.32
114.717.356444.98
1.1/4171862515.28
1.1/217.818.475605.56
21919.284647.14
2.1/223.628.9102837.65
325.930.5121958.84
427.73315211411.18

Class 6000

NPSMin Length of ThreadOutside Dia of Band
D		Center to End
A		Min
WT
BJ
1/210.913.646388.15
3/412.713.956448.53
114.717.362519.93
1.1/41718756010.59
1.1/217.818.4846411.07
21919.21028312.09
2.1/223.628.91219515.29
325.930.514610616.64
427.73315211418.67

Types of Threaded Tees

  1. Equal Threaded Tee

    • All three ends are of the same size.

    • Common in evenly branched pipe systems.

  2. Reducing Threaded Tee

    • One outlet is smaller than the other two.

Key Features

  • Connection Type: Female NPT or BSP Threads

  • Material: Stainless Steel, Carbon Steel, Alloy Steel, Brass, etc.

  • Pressure Classes: 2000 / 3000 / 6000

  • Standard Compliance: ASME B16.11, MSS SP-79, BS 3799

  • Size Range: 1/8” to 4” (DN6 to DN100)

Applications

  • Oil & gas pipelines

  • Chemical processing systems

  • Hydraulic and water supply lines

  • Firefighting and sprinkler networks

Scroll to Top