Aluminum Pipe Tee Fittings

What an Aluminum Tee Does

 

A aluminum tee is a short pipe-fitting with two outlets at 90° to the run. It splits one line into two - or, in the reducing version, drops the branch to a smaller size. On aluminum systems, tees are used where the line itself is aluminum and you want a continuous metallic weld rather than a transition fitting.

For comparison, on a carbon-steel line you'd use a long-radius carbon tee; on a copper line you'd braze a copper tee. The aluminum version exists because aluminum pipework is preferred for weight, corrosion resistance, and thermal reasons - and you need the tee to match the pipe alloy.

The two main distinctions that matter when ordering:

Aluminum Equal Tee: branch size = run size (e.g., 4" × 4"). Used for splitting flow evenly into two branches.

Aluminum Reducing Tee: branch size < run size (e.g., 6" × 4"). Used when one branch drops to a smaller instrument line, a chemical injection point, or a smaller distribution header.

A tee is the second-most-asked-for fitting in any aluminum pipe system after the elbow. If you have a piping isometric that lists aluminum, tees are on it.

 

Specification of GNEE aluminum pipe tee fitting

 

Item	Options
Type	Equal tee, Reducing tee, Straight tee, Barred tee (on request)
Connection	Butt-weld (BW), Socket-weld (SW for forged, class 3000), Threaded (NPT/BSP)
Manufacturing	Seamless extruded, fabricated (welded), forged (small sizes)
Size range	½" NPS – 24" NPS (DN15 – DN600), larger up to 48" on RFQ
Wall thickness	SCH 5s, 10s, 40s, 80s, 160s, XXS (per ASME B36.10M / B36.19M)
Alloys	6061-T6, 6063-T5/T6, 6082-T6, 5083-O, 5086-O, 5052-O, 1100-H14 etc.
Standards	ASTM B361, ASME SB361, ASME B16.9, ASME B16.52 (for forged SW), EN 755
Temper (as shipped)	O / H111 / H112 / T6 / T651 - depends on alloy
Surface	Mill finish, anodized (clear / colour / hard), brushed, polished, painted,Sandblasted Finish
Pressure class	Depends on alloy and schedule - example: 6061-T6 SCH 40 at 100°C ≈ 18 bar rated
Documentation	EN 10204 3.1 mill cert, PMI report, dimensional report, hydrostatic test
Lead time	15–25 days for stock sizes, 30–45 days for custom
Packaging	VCI film + ISPM 15 wooden case, FOB / CIF / EXW / DDP

 

Get a Quote in 24 Hours

 

Common alloys of aluminum pipe tee fitting

 

6061-T6 aluminum pipe tee fitting is the default for most jobs. It is strong, weldable, machinable, and it anodizes well. Tensile minimum 290 MPa, yield minimum 241 MPa per ASTM B221. Use it for compressed air, water, general industrial piping.

6063-T6 aluminum pipe tee is the choice when the surface matters. Lower strength than 6061 (207/172 MPa minimums) but it extrudes to a smoother surface and anodizes to the cleanest finish. Architectural and HVAC work often specifies it.

5083 aluminum tee fitting is the marine and cryogenic grade. O temper for cryogenic service down to -196°C, H116/H321 for shipboard structure. Tensile minimum 269–303 MPa depending on temper. 5083 resists seawater pitting that would eat a 6061 line.

5086 aluminum tee is the other marine alloy, close to 5083 with slightly lower magnesium. Both are acceptable for seawater; 5083 is more common in fittings.

6082 aluminum tee is the European equivalent of 6061 with a bit more strength. If your spec is EN, we supply it; US buyers usually stay with 6061.

5052 aluminum tee is manufactured from 5052 aluminum alloy, offering excellent corrosion resistance, weldability, and formability; it is suitable for marine applications, industrial piping, HVAC systems, and general fluid transport systems.

 

Chemical composition

Element	6061	6063	5083	5086	6082
Si	0.40–0.80	0.20–0.60	0.40 max	0.40 max	0.70–1.30
Fe	0.70 max	0.35 max	0.40 max	0.50 max	0.50 max
Cu	0.15–0.40	0.10 max	0.10 max	0.10 max	0.10 max
Mn	0.15 max	0.10 max	0.40–1.00	0.20–0.70	0.40–1.00
Mg	0.80–1.20	0.45–0.90	4.00–4.90	3.50–4.50	0.60–1.20
Cr	0.04–0.35	0.10 max	0.05–0.25	0.05–0.25	0.25 max
Zn	0.25 max	0.10 max	0.25 max	0.25 max	0.20 max
Ti	0.15 max	0.10 max	0.15 max	0.15 max	0.10 max

 

Mechanical properties

 

Alloy & temper	Spec min UTS	Spec min YS	Spec min Elong	Typical UTS / YS
6061-T6	290 MPa	241 MPa	8%	310 / 276 MPa
6063-T6	207 MPa	172 MPa	8–10%	241 / 214 MPa
6063-T5	152 MPa	110 MPa	8%	186 / 145 MPa
5083-O	269 MPa	110 MPa	16%	290 / 145 MPa
5083-H116/H321	303 MPa	228 MPa	10%	310 / 240 MPa
6082-T6	310 MPa	260 MPa	10%	340 / 310 MPa

Density is 2.70 g/cm³ for the 6xxx series and 2.66–2.68 for the 5xxx series. Young's modulus is about 69–70 GPa, one third of steel.

 

Standards of aluminum tees

 

We manufacture and inspect aluminum tees to:

Standard	What it covers
ASTM B361	Factory-made wrought aluminum and aluminum-alloy welding fittings
ASME SB361	ASME material version of ASTM B361
ASME B16.9	Factory-made wrought buttwelding fittings - dimensions, tolerances, marking
ASME B16.52	Forged aluminum and aluminum-alloy fittings with socket-welding and threaded ends
EN 755-1 to -9	Wrought aluminum extrusion products (used for stock pipe)
EN 10204 3.1	Mill test certificate content

 

Sizes and Dimensions

 

We supply stock tees from ½" NPS to 24" NPS. Custom sizes up to 48" NPS available on request. For a 90° equal tee in ASME B16.9 dimensions:

NPS	OD (mm)	Center-to-End C (mm)	SCH 40 wall (mm)	SCH 80 wall (mm)
½"	21.3	25.4	2.77	3.73
¾"	26.7	28.4	2.87	3.91
1"	33.4	38.1	3.38	4.55
1½"	48.3	47.8	3.68	5.08
2"	60.3	57.2	3.91	5.54
3"	88.9	76.2	5.49	7.62
4"	114.3	95.3	6.02	8.56
6"	168.3	124.0	7.11	10.97
8"	219.1	152.4	8.18	12.70
10"	273.1	175.0	9.27	15.09
12"	323.9	203.2	10.31	17.48
16"	406.4	254.0	12.70	21.44
20"	508.0	304.8	15.09	26.19
24"	609.6	355.6	17.48	30.96

Tolerances per ASME B16.9:

Center-to-end C: ± 2 mm for sizes ≤ 4"; ± 3 mm for sizes 5" – 8"; ± 5 mm above.

Wall thickness: -12.5% of nominal, no upper limit.

Outside diameter (at welding ends): per ASME B36.10M / B36.19M tables.

For reducing tees, the branch center-to-end is typically the same as an equal tee of the run size. The branch opening is bored to match the smaller NPS - see ASME B16.9 for the exact branch bore dimensions.

For threaded tees (NPT/BSP) up to 4" NPS, dimensions follow ASME B16.52. Larger threaded tees go through an SW transition.

Request Latest Price

Surface Treatment Options

 

Aluminum tees ship in mill finish by default. Other options:

• Mill finish - standard, as-extruded or as-formed.
• Anodized clear (Type II) - adds ~0.0003" oxide layer, slight matte finish, better corrosion resistance for indoor/casual-outdoor use.
• Anodized colour - black, bronze, gold, red, blue, custom colours. Used when visual appearance matters (architectural, food equipment).
• Hard anodized (Type III) - 0.002" oxide layer, very wear-resistant. Often used for hydraulic equipment.
• Brushed - mechanical finish for appearance.
• Polished - for sanitary / food-grade (note aluminum is rarely chosen for sanitary lines - 316L stainless dominates here).
• Painted / powder-coated - for colour matching on architectural projects.
• Sandblasted Finish

 

Welding the Tee (BW version)

 

For 6061-T6 tees, the recommended filler wires are:

ER4043 - the most common choice. Easy to feed, good wetting, slight as-welded strength drop (HAZ softens by ~30% in 6061-T6). Cosmetic finish is good.

ER5356 - slightly higher as-welded strength, better colour match after anodizing. Use when cosmetic anodizing is required post-fabrication.

For 5083-O, use ER5183 or ER5356.

For 6063, ER4043 or ER5356 - both work; 5356 is preferred when anodizing afterward.

The 6061-T6 HAZ softening is the main gotcha: if your tee is welded into a system that needs full T6 strength at the weld, that's something to plan for. Allowable stress derating factors are in ASME B31.3.

We do not pre-weld-age our tees - we ship them in the alloy's base temper (T6 or O). The post-weld aging step is performed on the finished piping assembly if the assembly is small enough to fit into an aging oven.

 

Send an Inquiry Now

Pressure Rating

 

Pressure rating depends on the alloy, temper, schedule, and the ASME B31.3 allowable stress at design temperature. A useful sanity-check for the common case of 6061-T6:

NPS × SCH	Design pressure at 38°C	Design pressure at 100°C	Design pressure at 200°C
1" SCH 40 6061-T6	35 bar	30 bar	22 bar
2" SCH 40 6061-T6	24 bar	21 bar	16 bar
4" SCH 40 6061-T6	18 bar	16 bar	12 bar
6" SCH 40 6061-T6	14 bar	12 bar	9 bar

These are illustrative. Final rating must be calculated per ASME B31.3 with the specific allowable stress for the alloy at design temperature, including appropriate joint efficiency factor for welded construction. We provide this calculation in the datasheet for any pressure-rated PO.

 

Comparison with other materials

 

Property vs other materials	Aluminum tee	304/316 stainless tee	Carbon steel tee
Density	2.7 g/cm³	8.0 g/cm³	7.85 g/cm³
Weight for the same NPS SCH 40	1 (reference)	3.0× heavier	2.9× heavier
Corrosion to atmosphere	Excellent (oxide film)	Excellent (Cr oxide)	Poor (needs paint)
Corrosion to seawater	Limited to 5xxx series	Good (316 better)	Poor
Corrosion to strong caustic	Poor	OK	OK
Approximate cost vs aluminum	-	2.5–4×	0.6–0.9×
Welding ease	Moderate (needs TIG, clean)	Moderate (TIG/MIG)	Easy (SMAW/GTAW)
Temperature limit continuous	200°C	800°C	400°C
Galvanic compatibility with steel	Not direct (use dielectric union)	OK	-

 

Packaging and Lead Time

 

Small tees (½" – 2" NPS): individually PE-bagged, then bundled in cartons, then palletized.

Medium tees (3" – 8" NPS): PE bag + carton + pallet stretch wrap.

Large tees (10" – 24" NPS): each piece wrapped, wooden case per ASME ISTA Procedure 3A or ISPM 15 (for export).

Oversize (>24" NPS): custom crating.

Trade terms we quote on: EXW Tianjin, FOB Tianjin / Shanghai / Qingdao, CIF destination port, DDP project site. Lead time for stock sizes is 15–25 working days; custom fabricated sizes are 30–45 days; custom alloys are 45–65 days.

 

 

Quality Inspection

 

Material verification - PMI on every heat using a positive material identification gun to confirm alloy.

Dimensional inspection - center-to-end, OD, wall thickness, branch bore diameter.

Visual inspection - weld bead, surface finish, no cracks/porosity/dent.

Hydrostatic test - for pressure service, 1.5× design pressure held for 5 minutes.

Documentation - EN 10204 3.1 cert, dimensional report, PMI report.

Each tee is marked with: manufacturer logo, material, size, schedule, heat number, standard.

 

 

FAQs

 

 

 

Hot Tags: aluminum pipe tee fittings, China aluminum pipe tee fittings manufacturers