5. ANSI flange standard

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Flanges Threaded

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Product Description:

Threaded flanges are flanges designed with internal threaded grooves, allowing them to connect to threaded pipes without welding. They are usually made of carbon steel, stainless steel, alloy, and other materials depending on the requirements of use and working environment.

Application:

Oil and gas industry: Used in oil and gas pipeline systems where a secure connection and easy disassembly are required.
Chemical industry: Applications in systems for conveying highly corrosive liquids and gases.
Energy industry: Used in thermal power plants, hydroelectric power plants, and steam systems.
Water and wastewater treatment: Applied in water supply and drainage systems, industrial and civil wastewater treatment.
Manufacturing industry: Used in production lines and pneumatic systems.

Standard version:

The ANSI B16.5 standard ensures that FLANGES THREADED meet strict requirements for size, material, pressure and temperature, ensuring safety and efficiency when used in industrial piping systems. This standard provides detailed guidance on manufacturing, installation and quality control, ensuring the compatibility and efficiency of flanges in actual applications.

Dimensions: The standard defines the specific dimensions of the flange including outside diameter, inside diameter, thickness, and threaded hole sizes.
Shape: The shape and design of the flange must comply with regulations to ensure compatibility and ease of installation with piping systems.
Nominal Pressure (Class): Flanges are classified according to different pressure classes (Class 150, 300, 600, 900, 1500, 2500) and must withstand the corresponding pressure.
Operating Temperature: Flanges must withstand different operating temperature levels depending on the material and application.
Material Type: Flanges can be manufactured from materials such as carbon steel, stainless steel, alloys and other materials to suit the specific requirements of the application.
Material quality: Materials must meet relevant ASTM standards, such as ASTM A105 for carbon steel, ASTM A182 for stainless steel.

Threaded Flanges Size and Thickness Chart

Size (NPS)

Outside Diameter (OD)

Hole Diameter (ID)

Washer Diameter (BC)

Number of Holes

Bolt Hole Diameter (BD)

Thickness (T)

1/2″

3.5″

(89 mm)

0.62″

(16 mm)

2.38″

(60 mm)

0.63″

(16 mm)

0.69″ (18 mm)

3/4″

3.88″

(98 mm)

0.82″

(21 mm)

2.75″

(70 mm)

0.63″

(16 mm)

0.81″ (21 mm)

1″

4.25″

(108 mm)

1.05″

(27 mm)

3.12″

(79 mm)

0.63″

(16 mm)

0.94″

(24 mm)

1 1/4″

4.62″

(117 mm)

1.32″

(34 mm)

3.5″

(89 mm)

0.63″

(16 mm)

1.00″

(25 mm)

1 1/2″

5″

(127 mm)

1.57″

(40 mm)

3.88″

(98 mm)

0.63″

(16 mm)

1.06″

(27 mm)

2″

6″

(152 mm)

2.07″

(53 mm)

4.75″

(121 mm)

0.75″

(19 mm)

1.19″

(30 mm)

2 1/2″

7″

(178 mm)

2.47″

(63 mm)

5.5″

(140 mm)

0.75″

(19 mm)

1.31″

(33 mm)

3″

7.5″

(191 mm)

3.07″

(78 mm)

6″

(152 mm)

0.75″

(19 mm)

1.38″

(35 mm)

3 1/2″

8.5″

(216 mm)

3.57″

(91 mm)

7″

(178 mm)

0.75″

(19 mm)

1.44″

(37 mm)

4″

9″

(229 mm)

4.03″

(102 mm)

7.5″

(191 mm)

0.75″

(19 mm)

1.56″

(40 mm)

5″

10″

(254 mm)

5.05″

(128 mm)

8.5″

(216 mm)

0.88″

(22 mm)

1.69″

(43 mm)

6″

11″

(279 mm)

6.07″

(154 mm)

9.5″

(241 mm)

0.88″

(22 mm)

1.81″

(46 mm)

8″

13.5″

(343 mm)

7.98″

(203 mm)

11.75″

(298 mm)

0.88″

(22 mm)

2.06″

(52 mm)

10″

16″

(406 mm)

10.02″

(254 mm)

14.25″

(362 mm)

1″

(25 mm)

2.19″

(56 mm)

12″

19″

(483 mm)

12.03″

(305 mm)

17″

(432 mm)

1″

(25 mm)

2.31″

(59 mm)

14″

21″

(533 mm)

14.02″

(356 mm)

18.75″

(476 mm)

1.13″

(29 mm)

2.50″

(64 mm)

16″

23.5″

(597 mm)

16.03″

(407 mm)

21.25″

(540 mm)

1.13″

(29 mm)

2.69″

(68 mm)

18″

25″

(635 mm)

18.03″

(458 mm)

22.75″

(578 mm)

1.25″

(32 mm)

2.88″

(73 mm)

20″

27.5″

(699 mm)

20.03″

(509 mm)

25″

(635 mm)

1.25″

(32 mm)

3.06″

(78 mm)

24″

32″

(813 mm)

24.03″

(610 mm)

29.5″

(749 mm)

1.38″

(35 mm)

3.25″

(83 mm)

Note:

OD: Outside diameter of flange.
ID: Flange bore diameter.
BC: Diameter of the washer.
BD: Bolt hole diameter.
T: Flange thickness.

Material Summary of Threaded Flanges

Material	ASTM Standards	Characteristic	Main Applications
Carbon steel	ASTM A105	High strength, good resistance to pressure and temperature	Oil, gas, chemicals, power plants
Stainless Steel (304)	ASTM A182 F304	Good corrosion resistance, durable in harsh environments	Food, pharmaceutical, chemical industry
Stainless Steel (316)	ASTM A182 F316	Higher corrosion resistance than 304, resistant to acidic environments	Chemical industry, oil and gas, seawater treatment
Alloy steel	ASTM A182 F11, F22, F91	High temperature and pressure resistance, durable in harsh environments	Power plant, boiler, chemical industry
Duplex Stainless Steel	ASTM A182 F51, F53	High corrosion resistance, high durability	Oil and gas, seawater treatment, chemical industry
Nickel Alloy	ASTM B564 (Inconel, Hastelloy)	High temperature resistance, excellent corrosion resistance	Aviation, chemical, nuclear industry
Copper and Copper Alloys	ASTM B61, B62	Anti-corrosion in seawater environment	Marine industry, water systems, water treatment
Aluminum and Aluminum Alloys	ASTM B247	Light, good corrosion resistance, easy to process	Aviation industry, automobile industry, construction
Plastic and Plastic Alloys	N/A	Lightweight, corrosion resistant, good insulation	Chemical, water treatment, food and pharmaceutical industries