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Outlet Fittings

Outlet Fittings: Specifications | Materials | Types | Dimensions | Weight Chart | Tolerances | FAQ

ASME B16.11 / MSS-SP-97 Outlet Fittings – Leading Manufacturer & Exporter of Forged Branch Connections (Weldolet, Sockolet, Threadolet, Elbolet, Latrolet & Nipolet) in CS, SS, Alloy Steel & Duplex – Sizes ½” to 24”, Run Pipe up to 72”, Pressure Classes 3000#, 6000#, 9000# – Supplied to Europe, Africa, Asia & Gulf Countries

ASME B16.11 / MSS-SP-97 Outlet Fittings Manufacturer

Best Export Prices: sales@midlandforgefittings.com

Midland Forge and Fittings Pvt. Ltd. is a trusted manufacturer, supplier, and exporter of high-quality Outlet Fittings designed for reliable branch connections in piping systems. With decades of experience in the forging industry. we combine advanced manufacturing techniques with strict quality control to ensure every fitting meets international standards.

We specialize in producing Weldolet, Sockolet, Threadolet, Elbolet, Latrolet, and Nipolet as per ASME B16.11 and MSS-SP-97 standards. Our fittings are engineered to deliver excellent strength, leak-proof performance, and durability in demanding industrial applications.

Outlet fittings, also known as branch connection fittings, are specialized forged pipe fittings designed to provide an integral and reliable outlet from a larger pipe to a smaller one without the need for reducing tees or boring holes. Outlet fittings are widely used in high-pressure, high-temperature, and critical piping systems across industries like oil & gas, petrochemicals, refineries, power plants, shipbuilding, and chemical processing.

Olet fittings provide reinforced branch connections that ensure structural integrity, leak-proof performance, and cost efficiency by eliminating bulky tees and extra welds. They are versatile, available in socket weld, threaded, and butt weld ends with pressure classes 3000#, 6000#, and 9000#, and their compact design allows smooth flow with minimal pressure drop. This makes them ideal for critical pipelines, delivering long service life, reduced maintenance, and reliable performance across industries.

As a globally recognized company, Midland Forge, exports outlet fittings to clients in the USA, Germany, UK, Australia, Middle East, Africa, and Asia. With a strong focus on customer satisfaction, timely delivery, and competitive pricing, we have established ourselves as a reliable partner for industries worldwide. Our commitment to quality, innovation, and consistency makes us one of the leading names in Outlet Fittings manufacturing.

ASME B16.11 Branch Connection Fittings

Outlet Fittings Specifications

Size Range – (Socket weld & Screwed-Threaded)

½” to 24” NB (DN15 ~ DN600)

Pressure Rating

3000 LBS, 6000 LBS, 9000 LBS

Marking

Grade, Size, Schedule, Heat No., Standard, Manufacturer Name

Fitting Types

Weldolet, Sockolet, Threadolet, Nipolet, Elbolet, Latrolet, Sweepolet, Flexolet, Insert Weldolet

Thread/MTC

NPT, BSPT, BSPP EN 10204 3.1 and EN 10204 3.2 - NACE

Manufacturing Standards

ASME B16.11, MSS SP-97 (Outlet Fittings), BS 3799 (Screwed & Socket-Weld Fittings)

Materials

Stainless Steel, Carbon Steel, Alloy Steel, Duplex Steel, Super Duplex, Nickel, Inconel, Incoloy, Hastelloy, Monel, Alloy 20, 254 SMO, Copper Nickel, Titanium.

Dimensional Standards

ASME B16.11, MSS SP-79, 83, 95, 97, BS 3799

Testing

Hydrostatic Test, Visual & Dimensional Inspection, MPI, Dye Penetrant Test (DPT), Ultrasonic Test (UT), PMI, Hardness Test, Third-Party Inspection (BV, SGS, TUV)

Surface Finish

Black (Carbon Steel), Electro-Galvanized, Hot-Dip Galvanized, Pickled & Passivated (Stainless Steel), Oiled, Sandblasted, or as required
ASME B16.11, MSS SP - 97

Industrial Outlet Fittings – Materials, Grades & Standards

Material Category Standards, Grade (ASTM / ASME) Recommended Fitting Types Pressure Class / Size Range Typical Use / Application
Stainless Steel ASTM A182 F304 / F304L / F304H Weldolet, Sockolet, Threadolet, Nipolet 3000#–9000#,
½”–24”		 General purpose, corrosion resistance
ASTM A182 F316 / F316L / F316H Weldolet, Sockolet, Threadolet, Nipolet 3000#–9000#,
½”–24”		 Marine, chemical, and food processing
ASTM A182 F321 / F321H Weldolet, Sockolet 3000#–9000#,
½”–24”		 High temperature, stabilized service
Carbon Steel ASTM A105 Weldolet, Sockolet, Threadolet 3000#–9000#,
½”–24”		 Pressure piping & general industries
ASTM A350 LF2 Weldolet, Sockolet 3000#–9000#,
½”–24”		 Low temperature services
Alloy Steel ASTM A182 F11 / F22 Weldolet, Sockolet, Threadolet 3000#–9000#,
½”–24”		 Steam lines & refineries
ASTM A182 F91 Weldolet, Sockolet 3000#–9000#,
½”–24”		 Power generation,
high-performance pipelines
Duplex / Super Duplex Steel ASTM A182 F51 / F53 / F55 / F60,
UNS S31803 / S32205 / S32750 / S32760		 Weldolet, Sockolet 3000#–9000#,
½”–24”		 Corrosion resistance, offshore,
seawater applications
Nickel Alloys ASTM B564 Inconel 600 / 625 / 718 Weldolet, Sockolet, Threadolet 3000#–9000#,
½”–24”		 Heat exchangers, aerospace,
chemical processing
ASTM B564 Monel 400 / K500 Weldolet, Sockolet 3000#–9000#,
½”–24”		 Seawater, marine engineering
Copper Nickel ASTM B151 / B467
Cu-Ni 90/10 / 70/30		 Weldolet, Sockolet 3000#–9000#,
½”–24”		 Marine systems, seawater service
Titanium ASTM B381 Grade 2 / Grade 5 Weldolet, Sockolet 3000#–9000#,
½”–24”		 Lightweight, corrosion resistance
Aluminium ASTM B247 6061 / 5083 Weldolet 2000#–6000#,
½”–12”		 Low-pressure,
non-corrosive piping
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ASME B16.11 / MSS SP-97

Types of ASME B16.11 Outlet Fittings

weldolet Manufacturer
Weldolet
sockolet
Sockolet
threadolet
Threadolet
nipolet Manufacturer
Nipolet
elbolet
Elbolet
latrolet
Latrolet
sweepolet Manufacturer
Sweepolet
Flexolet
insert weldolet
Insert Weldolet (Insert Olet)

Dimensions of ASME B16.11 Weldolet - MSS SP97

Dimensions of ASME B16.11 Weldolet Fittings

NPSABCD
1/23/4
19.05		1.3/8
34.93		15/16
23.81		5/8
15.88
3/47/8
22.23		1.5/8
41.28		1.3/16
30.16		13/16
20.64
11.1/16
26.99		2
50.80		1.7/16
36.51		1.1/32
26.19
1.1/41.1/4
31.75		2.3/8
60.3		1.3/4
44.45		1.3/8
34.93
1.1/21.5/16
33.34		2.7/8
73		2
50.80		1.5/8
41.28
21.1/2
38.10		3.1/2
88.90		2.9/16
65.09		2.1/16
52.39
2.1/21.5/8
41.28		4.1/16
103.19		3
76.20		2.7/16
61.91
31.3/4
44.45		4.13/16
122.24		3.11/16
93.66		3.1/16
77.79
3.1/22
50.80		5.3/8
136.53		3.7/8
98.43		3.9/16
90.49
42
50.80		6
152.40		4.3/4
120.65		4
101.60
52.1/4
57.15		7.1/8
180.98		5.9/16
141.29		5.1/16
128.59
62.3/8
60.3		8.1/2
215.90		6.11/16
169.86		6.1/16
153.99
82.3/4
69.85		10.3/8
263.53		8.11/16
220.66		7.15/16
201.61
103.1/16
77.79		12.9/16
319.09		10.13/16
274.64		10
254.00
123.3/8
85.73		14.7/8
377.83		12.13/16
325.44		12
304.80
143.1/2
88.90		16.1/8
409.58		14.1/16
357.19		13.1/4
336.55
163.11/16
93.66		18¼
463.55		16.1/16
407.99		15¼
387.35
184.1/16
103.19		20.3/4
527.05		18.5/8
473.08		17¼
438.15
204.5/8
117.48		23.1/16
585.79		20.1/16
509.59		19¼
488.95
245.3/8
136.53		27.7/8
708.03		25.1/8
638.18		23.1/4
590.55

Dimensions of ASME B16.11 Sockolets - MSS SP97 (Class 3000)

Dimensions of ASME B16.11 Sockolets Fittings
NPS A B C D E
1/2 1
25.4		 1.3/8
34.92		 15/16
23.81		 0.622
15.80		 17/32
13.49
3/4 1.1/16
26.98		 1.5/8
41.27		 1.3/16
30.16		 0.824
20.93		 15/32
11.90
1 1.5/16
33.33		 2
50.8		 1.7/16
36.51		 1.049
26.64		 23/32
18.25
1.1/4 1.5/16
33.33		 2.3/8
60.32		 1.3/4
44.45		 1.380
35.05		 9/16
14.28
1.1/2 1.3/8
34.92		 2.7/8
73.02		 2
50.8		 1.610
40.89		 21/32
16.66
2 1.1/2
38.1		 3.1/2
88.9		 2.9/16
65.08		 2.067
52.50		 15/16
23.81
2.1/2 1.9/16
39.68		 4.1/16
103.18		 3
76.2		 2.469
62.71		 3/4
19.05
3 1.3/4
44.45		 4.13/16
122.23		 3.11/16
93.66		 3.068
77.93		 15/16
23.81
3.1/2 1.11/16
42.86		 5.3/8
136.52		 4.7/16
112.71		 3.548
90.12		 11/16
17.46
4 1.7/8
47.62		 6.1/16
153.98		 4.3/4
120.65		 4.026
102.26		 1.1/16
26.98
5 2.7/16
61.91		 7¼
184.15		 5¼
133.35		 5.047
128.19		 1
25.4
6 2.11/16
68.26		 8.11/16
220.66		 6.1/16
153.98		 6.065
154.05		 1.3/16
30.16
X = Min. 1/16 (1.6 mm)

Dimensions of ASME B16.11 Thredolets - MSS SP97 (Class 3000)

Dimensions of ASME B16.11 Thredolets Fittings
NPS A B C D
1/2 1
25.40		 1.3/8
34.92		 15/16
23.81		 5/8
15.87
3/4 1.1/16
26.98		 1.5/8
41.27		 1.3/16
30.16		 13/16
20.63
1 1.5/16
33.33		 2
50.80		 1.7/16
36.51		 1.1/16
26.98
1.1/4 1.5/16
33.33		 2.3/8
60.32		 1.3/4
44.45		 1.3/8
34.92
1.1/2 1.3/8
34.92		 2.7/8
73.02		 2
50.80		 1.5/8
41.27
2 1.1/2
38.10		 3.1/2
88.90		 2.9/16
65.08		 2.1/16
52.38
2.1/2 1.29/32
48.41		 4.1/16
103.18		 3
76.20		 2.1/2
63.50
3 2
50.80		 4.13/16
122.23		 3.11/16
93.66		 3.1/16
77.78
3.1/2 2.1/8
53.97		 5.3/8
136.52		 4.7/16
112.71		 3.9/16
90.48
4 2.1/4
57.15		 6.1/16
153.98		 4.3/4
120.65		 4.1/16
103.18
5 2.7/16
61.91		 7¼
184.15		 5¼
133.35		 5¼
133.35
6 2.3/4
69.85		 8.11/16
220.66		 5.3/4
146.05		 5.3/4
146.05

Dimensions of ASME B16.11 Elbolet - MSS SP97 (Class 3000, 6000)

Dimensions of ASME B16.11 Elbolet Fittings
Nominal Elbow Size (NPS) Outlet Size (NPS) CL 3000 CL 6000
C E C E
36 – 3/4 1/4 38.10 40.48 38.10 40.48
36 – 3/4 3/8 38.10 40.48 38.10 40.48
36 – 3/4 1/2 38.10 40.48 43.65 47.63
36 – 1 3/4 43.65 47.63 57.15 57.15
36 – 2 1 57.15 57.15 73.03 63.50
36 – 2 1.1/4 73.03 63.50 79.38 68.26
36 – 2 1.1/2 79.38 68.26 106.36 82.55
36 – 3 2 106.36 95.25 – –

Dimensions of ASME B16.11 Latrolet - MSS SP97 (Class 3000, 6000)

Dimensions of ASME B16.11 Latrolet Fittings
STD & XS Butt Weld
NPS A B C E
1/4 33.34 53.18 36.51 39.69
3/8 33.34 53.18 36.51 39.69
1/2 34.93 54.77 36.51 39.69
3/4 42.86 64.29 44.45 48.42
1 50.01 76.20 53.98 55.56
1.1/4 57.94 91.28 66.68 62.71
1.1/2 62.71 100.81 76.99 66.68
2 80.96 133.35 104.78 86.52
2.1/2 80.17 131.76 104.78 80.17
3 96.84 158.75 126.21 96.04
4 120.65 198.44 163.51 115.89
Sch.160 & XXS Butt Weld
NPS A B C
1/4 39.69 58.74 36.51
3/8 39.69 58.74 36.51
1/2 46.04 69.85 44.45
3/4 53.98 82.55 53.98
1 63.50 96.84 66.68
1.1/4 69.85 107.95 76.20
1.1/2 85.73 136.53 104.78
2 80.96 133.35 104.78
2.1/2 80.17 131.76 104.78
3 96.84 158.75 126.21
4 120.65 198.44 163.51
Class 3000 Threaded & Socket Weld
NPS A B C E
1/4 39.69 59.53 36.51 39.69
3/8 39.69 59.53 36.51 39.69
1/2 39.69 59.53 36.51 39.69
3/4 47.63 69.85 44.45 48.42
1 55.56 82.55 53.98 55.56
1.1/4 63.50 97.63 66.68 74.61
1.1/2 69.85 107.16 76.99 66.68
2 85.73 138.11 104.78 80.17
Class 6000 Threaded & Socket Weld
NPS A B C E
1/4 39.69 59.53 36.51 39.69
3/8 39.69 59.53 36.51 39.69
1/2 47.63 69.85 44.45 48.42
3/4 55.56 82.55 53.98 55.56
1 63.50 92.87 66.68 62.71
1.1/4 69.85 107.16 76.99 66.68
1.1/2 85.73 138.11 104.78 80.17
2 85.73 138.11 104.78 80.17

Weight Chart (lbs) : Pipe Branch Fittings (Carbon Steel Outlet Fittings)

Fitting Type Run Pipe Size (NPS) Branch Size (NPS) Weight (lbs)
Weldolet ½” ½” 0.35
1″ 1″ 0.75
2″ 2″ 1.90
4″ 4″ 6.50
6″ 6″ 14.0
Sockolet ½” ½” 0.40
1″ 1″ 0.85
2″ 2″ 2.00
4″ 4″ 6.80
6″ 6″ 14.5
Threadolet ½” ½” 0.30
1″ 1″ 0.65
2″ 2″ 1.50
4″ 4″ 5.50
Elbolet 2″ 2″ 1.60
4″ 4″ 5.80
Latrolet 2″ 2″ 1.55
4″ 4″ 5.60
Nipolet 1″ 1″ 0.50
2″ 2″ 1.40
4″ 4″ 5.00

Olet Fitting Tolerances as per ASME B16.11

Fitting Type Run / Branch Size
(NPS / DN)		 Socket Bore (B)
Tolerance		 OD Tolerance Height / Length (H/L) Thread / Socket Depth
Weldolet ½” – 24″
(DN15 – DN600)		 ±0.5% of branch OD ±0.5% of run OD ±1/16″ (≤6″) / ±1/8″ (>6″) Socket depth ±1/16″
Sockolet ½” – 24″
(DN15 – DN600)		 ±0.5% of branch OD ±0.5% of run OD ±1/16″ (≤6″) / ±1/8″ (>6″) Socket depth ±1/16″
Threadolet ½” – 24″
(DN15 – DN600)		 ±0.5% of branch OD ±0.5% of run OD ±1/16″ (≤6″) / ±1/8″ (>6″) Thread per ANSI B1.20.1
Elbolet ½” – 24″
(DN15 – DN600)		 ±0.5% of branch OD ±0.5% of run OD ±1/16″ (≤6″) / ±1/8″ (>6″) Socket depth ±1/16″
Latrolet ½” – 24″
(DN15 – DN600)		 ±0.5% of branch OD ±0.5% of run OD ±1/16″ (≤6″) / ±1/8″ (>6″) Socket depth ±1/16″
Nipolet ½” – 24″
(DN15 – DN600)		 ±0.5% of branch OD ±0.5% of run OD ±1/16″ (≤6″) / ±1/8″ (>6″) Socket depth ±1/16″
How are Olet fittings classified based on connection type?

  • Welded Olets:

    • Weldolet → Butt-weld end, ideal for high-pressure pipelines.

    • Sockolet → Socket-weld end, mostly for smaller bore branch connections.

    • Elbolet → Designed for 90°/45° elbows, enabling branch connections at bends.

  • Threaded Olets:

    • Threadolet → Internal threaded branch for quick connection without welding.

  • Special Olets:

    • Latrolet (45° branch), Sweepolet (low-stress design), Nipolet (Olet + nipple combined).
      ✅ Classification helps engineers choose based on pressure, flow direction, and weldability.

  • Stress Distribution – Olets minimize stress concentration at the header-to-branch intersection, unlike T-joints that create weak zones.

  • Material Optimization – Requires less welding material compared to fabricated tees.

  • Flexibility – Olets can be used on straight pipes, elbows, or even reducers, whereas T-joints are limited.

  • Range of Sizes – Easily connects large headers to very small bore branches.

  • Integral Reinforcement: Olets provide their own reinforcement without requiring pads.

  • Area Replacement Method: Metal removed from header during branch opening is compensated by extra thickness of Olet body.

  • Advantage: Simplifies fabrication and reduces additional weld pads, saving time.

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