4. ASME B16.11 Forged steel fittings

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Threaded Boss

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Description

Threaded Boss is a pipe fitting, typically circular or rectangular in shape, with an internally threaded hole for attaching pipes or other equipment. They are typically made from materials such as carbon steel, stainless steel, copper, or other alloys depending on the specific application requirements.

Applications

Oil and gas industry: Used in oil and gas pipeline systems to connect pipe sections or pressure and temperature measuring devices.
Plumbing systems: Used in plumbing systems to connect pipes, valves or flow control devices.
Chemical and plant industry: Used to connect measurement and process control devices in chemical plants.
Manufacturing industry: Applied in pneumatic piping systems or control systems during the manufacturing process.

Standards

ASME B16.11 is the American Society of Mechanical Engineers (ASME) standard for threaded pipe fittings including couplings, unions, caps, and plugs. Threaded Boss is one of the fittings included in this standard.

Nominal Size: Determined according to standard pipe system.
Dimensional Tolerances: Must comply with the provisions in ASME B16.11 to ensure accuracy in assembly and operation.
Material: Carbon steel, stainless steel, other alloys.
Working Pressure: Depends on material and size, usually classified by Class (2000, 3000, 6000, and 9000).

Threaded Boss Dimensions and Thickness Chart According to ASME B16.11

Nominal size (in)	Outside diameter (OD) (in)	Length (L) (in)	Wall Thickness (T) (in)	Thread (NPT/BSP)
1/2	0.84	1.50	0.147	NPT/BSP
3/4	1.05	1.60	0.154	NPT/BSP
1	1.315	1.80	0.179	NPT/BSP
1-1/2	1.90	2.10	0.200	NPT/BSP
2	2.375	2.60	0.218	NPT/BSP
3	3.50	3.20	0.300	NPT/BSP
4	4.50	3.80	0.337	NPT/BSP
6	6.625	5.10	0.432	NPT/BSP
8	8.625	6.20	0.500	NPT/BSP
10	10.75	7.25	0.593	NPT/BSP
12	12.75	8.50	0.687	NPT/BSP
14	14.00	9.00	0.750	NPT/BSP
16	16.00	10.00	0.843	NPT/BSP
18	18.00	11.00	0.937	NPT/BSP
20	20.00	12.00	1.031	NPT/BSP
24	24.00	14.00	1.219	NPT/BSP

Note:

OD (Outside Diameter): Outer diameter of Threaded Boss.
L (Length): Overall length of Threaded Boss.
T (Wall Thickness): Wall thickness of Threaded Boss.
Thread: Thread type, can be NPT (National Pipe Thread) or BSP (British Standard Pipe).

Summary table of commonly used materials for Threaded Boss according to ASME B16.11

Material	ASTM standards	Main application	Characteristic
Carbon steel	ASTM A105/A105M	Oil, gas, water pipeline system	High durability, low cost, easy to process
Stainless Steel	ASTM A182/A182M	Chemical, food, pharmaceutical industry	High corrosion resistance, good heat resistance
Alloy steel	ASTM A350 LF2	Low temperature application	Low temperature resistance, good durability
Copper	ASTM B62	Water supply and cooling system	Good corrosion resistance, good thermal and electrical conductivity
Copper alloy	ASTM B61/B62	Marine and chemical industry	High corrosion resistance in harsh environments
Nickel alloy steel	ASTM B564	Chemical and petroleum industry	High corrosion resistance, high temperature and pressure resistance
Aluminum	ASTM B247	Air duct system, cooling system	Light, good corrosion resistance, easy to process
Inconel	ASTM B564	Aviation, industry	High temperature resistance, good corrosion resistance in harsh environments
Hastelloy	ASTM B574	Chemical industry, water treatment	High corrosion resistance, resistant to acid and alkaline environments
Titanium	ASTM B381	Aviation, medical, industrial	Light, high strength, very good corrosion resistance

Note:

ASTM Standards: Are standards of the American Society for Testing and Materials, defining the properties and technical requirements of materials.
Main applications: Industries and systems that commonly use the material.
Properties: The characteristic properties of a material that determine its suitability for a particular application.