EN 10253-4 equal Tee Reducing Tee

As aprofessional manufacturer and exporter of EN 10253-4 Stainless Steel Tees, We are offering equal tees and reducing tees made from austenitic and duplex stainless steels. Our EN 10253-4 tees are designed for pressure piping systems, ensuring high corrosion resistance, durability, and leak-proof performance.

All fittings are produced according to EN 10253-4 Type A and Type B, fully tested, and supplied with EN 10204 3.1 certification.

What is an EN 10253-4 Tee?

An EN 10253-4 Tee is a butt-weld pipe fitting used to combine or divide fluid flow in a pipeline.
The standard defines the technical delivery requirements for stainless steel butt-weld fittings including elbows, tees, reducers, and caps used in pressure pipelines and industrial installations.

EN 10253-4 Tees are available in:

Equal Tee (Straight Tee) — all three outlets are the same diameter
Reducing Tee — branch outlet is smaller than the run pipes

Available Material Grades

Material No.	Steel Grade	Equivalent ASTM / UNS	Type
1.4301	X5CrNi18-10	AISI 304 / UNS S30400	Austenitic
1.4307	X2CrNi18-9	AISI 304L / UNS S30403	Austenitic
1.4404	X2CrNiMo17-12-2	AISI 316L / UNS S31603	Austenitic
1.4541	X6CrNiTi18-10	AISI 321	Stabilized Austenitic
1.4571	X6CrNiMoTi17-12-2	AISI 316Ti	Stabilized Austenitic
1.4462	X2CrNiMoN22-5-3	Duplex UNS S31803 / S32205	Duplex
1.4410	X2CrNiMoN25-7-4	Super Duplex UNS S32750	Super Duplex

Heat Treatment

Austenitic stainless steel tees: Solution annealed at 1050–1150°C, then water quenched.
Duplex stainless steel tees: Solution annealed at 1020–1100°C, rapidly cooled.

Proper heat treatment ensures maximum corrosion resistance and ductility.

Table A.2 — Below is structural dimensions for tees, equal and reduced listed

DN	Dmm	DN1	D1mm	Fmm	Gmm	DN	Dmm	DN1	D1mm	Fmm	Gmm
15	21,3	15	21,3	25	–	300	323,9	300	323,9	254	–
20	26,9	20	26,9	29	–			250	273		241
20	26,9	15	21,3	29	29			200	219,1		229
25	33,7	25	33,7	38	–			150	168,3		219
		20	26,9		38	350	355,6	350	355,6	279	–
		15	21,3		38			300	323,9		270
32	42,4	32	42,4	48	–			250	273		257
		25	33,7		48			200	219,1		248
		20	26,9		48	400	406,4	400	406,4	305	–
		15	21,3		48			350	355,6		305
40	48,3	40	48,3	57	–			300	323,9		295
		32	42,4		57			250	273		283
		25	33,7		57	450	457	450	457	343	–
		20	26,9		57			400	406,4		330
50	60,3	50	60,3	64	–			350	355,6		330
		40	48,3		60			300	323,9		321
		32	42,4		57	500	508	500	508	381	–
		25	33,7		51			450	457		368
65	76,1	65	76,1	76	–			400	406,4		356
		50	60,3		70			350	355,6		356
		40	48,3		67	600	610	600	610	432	–
		32	42,4		64			500	508		432
80	88,9	80	88,9	86	–			450	457		419
		65	76,1		83			400	406,4		406
		50	60,3		76	700	711	700	711	521	–
		40	48,3		73	800	813	800	813	597	–
100	114,3	100	114,3	105	–	900	914	900	914	673	–
		80	88,9		98	1000	1016	1000	1016	749	–
		65	76,1		95
		50	60,3		89
125	139,7	125	139,7	124	–
		100	114,3		117
		80	88,9		111
		65	76,1		108
150	168,3	150	168,3	143	–
		125	139,7		137
		100	114,3		130
		80	88,9		124
200	219,1	200	219,1	178	–
		150	168,3		168
		125	139,7		162
		100	114,3		156
250	273	250	273	216	–
		200	219,1		203
		150	168,3		194
		125	139,7		191

Table A.3 – Below are the structural dimensions for pulled tees, equal and reduced listed

DN	Dmm	DN1	D1mm	Fmm	hmm
50	60,3	50	60,3	50	3
		40	48,3		3
		32	42,4		2
		25	33,7		2
65	76,1	65	76,1	65	4
		50	60,3		3
		40	48,3		3
		32	42,4		2
80	88,9	80	88,9	80	5
		65	76,1		4
		50	60,3		3
		40	48,3		3
100	114,3	100	114,3	100	7
		80	88,9		5
		65	76,1		4
		50	60,3		3
125	139,7	125	139,7	125	8
		100	114,3		7
		80	88,9		5
		65	76,1		4
150	168,3	150	168,3	150	10
		125	139,7		8
		100	114,3		7
		80	88,9		5
200	219,1	200	219,1	200	12
		150	168,3		10
		125	139,7		8
		100	114,3		7
250	273	250	273	250	13
		200	219,1		12
		150	168,3		10
		125	139,7		8
300	323,9	300	323,9	300	15
		250	273		13
		200	219,1		12
		150	168,3		10
350	355,6	350	355,6	350	17
		300	323,9		15
		250	273		13
		200	219,1		12
400	406,4	400	406,4	400	20
		350	355,6		15
		300	323,9		13
		250	273		13

Table A.4 – Below are the structural dimensions for branch welded tees, equal and reduced listed

DN	Dmm	DN1	D1mm	Fmm	DN	Dmm	DN1	D1mm	Fmm
50	60,3	50	60,3	125	450	457	450	457	450
		40	48,3				400	406,4
		32	42,4				350	355,6
		25	33,7				300	323,9
65	76,1	65	76,1	140	500	508	500	508	500
		50	60,3				450	457
		40	48,3				400	406,4
		32	42,4				350	355,6
80	88,9	80	88,9	150	600	610	600	610	600
		65	76,1				500	508
		50	60,3				450	457
		40	48,3				400	406,4
100	114,3	100	114,3	160	700	711	700	711	700
		80	88,9				600	610
		65	76,1				500	508
		50	60,3				450	457
125	139,7	125	139,7	180	800	813	800	813	800
		100	114,3				700	711
		80	88,9				600	610
		65	76,1				500	508
150	168,3	150	168,3	200	900	914	900	914	900
		125	139,7				800	813
		100	114,3				700	711
		80	88,9				600	610
200	219,1	200	219,1	250	1000	1016	1000	1016	1000
		150	168,3				900	914
		125	139,7				800	813
		100	114,3				700	711
250	273	250	273	300
		200	219,1
		150	168,3
		125	139,7
300	323,9	300	323,9	330
		250	273
		200	219,1
		150	168,3
350	355,6	350	355,6	360
		300	323,9
		250	273
		200	219,1
400	406,4	400	406,4	400
		350	355,6
		300	323,9
		250	273

Download EN 10253-4 Tee Dimension

Inspection and Testing

Each EN 10253-4 tee undergoes strict testing and inspection, including:

Visual and dimensional inspection
Hydrostatic or pneumatic pressure test
Non-destructive testing (UT, PT, RT)
Chemical composition verification
Mechanical testing per EN ISO standards
Certified to EN 10204 3.1 / 3.2

Marking and Documentation

Each tee is clearly marked with:

Manufacturer’s logo or name
Material grade and heat number
Standard: EN 10253-4 Type A/B
Size and wall thickness
Batch number and inspection reference

Documentation includes full MTC (Material Test Certificate) and traceability data.

Example Order Information

Product: EN 10253-4 Tee
Type: Type B, Reducing Tee
Material: 1.4404 (X2CrNiMo17-12-2) – AISI 316L
Size: DN150 × DN100, SCH40
Manufacture: Seamless
Inspection: EN 10204 3.1