ASTM A694 Threaded Flange

In the present industrial era, piping design is very important to the field of piping systems and means that critical choices play a key role.ASTM A649 threaded flange is critical components in high pressure, high pressure transmission systems, especially in the oil, gas and petrochemical industries. These flanges are manufactured in strict accordance with ASTM A694, a standard under which threaded flanges are designed for high-strength, corrosion-resistant, and high-pressure applications, and are ideal for sour gas (H₂S) environments and extreme service conditions.

What Is an ASTM A694 Threaded Flange

Threaded flanges are a kind of flanges assembled with pipelines by means of threaded connection, which are widely used in all kinds of industrial piping systems. Among them, ASTM A694 threaded flange is produced according to the ASTM A694 standard set by the American Society for Testing and Materials (ASTM) for carbon and alloy steel flanges used in high-pressure transmission systems. It has various material grades, such as Gr. F42, F50, etc.

Different grades correspond to specific chemical composition and mechanical property requirements, which can meet the needs of different pressures and temperatures. Threaded flanges are tightly fitted to the pipeline through precisely processed threads. Compared with welding, butt welding and other connection methods, their installation and disassembly are more convenient, which facilitates the maintenance and overhaul of the equipment and can effectively prevent the pipeline from loosening and leaking under the complicated environments of high pressure, vibration, etc.

Specification of Threaded Flange

Sealing Face	RF, FF, FTJ
Size Range	1/2” – 48” / DN15 – DN1200
Pressure Rating	Class 150, 300, 600, 900, 1500, 2500lb
ASME Standard	ASME / ANSI B16.5, ASME B16.47 Series A/B
EN Standard	EN 1092-1
DIN Standard	DIN2566, DIN 2565, DIN 2567, DIN 2568, DIN 2569
BS Standard	BS4504 , BS10

ASTM A694 Material

Chemical Composition

The chemical composition of ASTM A694 is crucial to its performance, and a reasonable elemental ratio not only ensures that the material has good strength, toughness and compression resistance, but also ensures its stability and safety in high temperature and high pressure environments.

CHEMICAL	LIMITS	C	Mn	P	S	Si
ASTM A694	MIN					0.15
ASTM A694	MAX	0.30	1.60	0.025	0.025	0.35

Mechanical Properties

Mechanical properties are the core indicators for the safety and service life of industrial equipment.

MATERIAL	T.S (MPA)	Y.S (MPA)	EL %
ASTM A694 F42	415 min	290 min	20 min
ASTM A694 F46	415 min	315min	20 min
ASTM A694 F52	455min	360min	20 min
ASTM A694 F56	470min	385min	20 min
ASTM A694 F60	515min	415min	20 min
ASTM A694 F65	530min	450min	20 min
ASTM A694 F70	565min	485min	18 min

Dimension of ASME B16.5 Threaded Flange

ZIZI specializes in the production and supply of various types of pipeline steel threaded flanges, which cover pressure values including 150#, 300#, 400#, 600#, 900#, 1500#, 2500#.

ASME B16.5 Class 150# Threaded Flange Dimension

Nominal Pipe Size		A	C	D	E	F	G	H	I	J	Weight
inch	mm	mm	mm	mm	mm	mm	mm	Holes	mm	mm	kg / piece
1/2	21.30	88.90	11.20	15.70	15.70	30.20	35.10	4	15.70	60.45	0.39
3/4	26.70	98.60	12.70	15.70	15.70	38.10	42.90	4	15.70	69.85	0.56
1	33.40	108.0	14.20	17.50	17.50	49.30	50.80	4	15.70	79.25	0.78
11/4	42.20	117.3	15.70	20.60	20.60	58.70	63.50	4	15.70	88.90	1.03
11/2	48.30	127.0	17.50	22.40	22.30	65.00	73.15	4	15.70	98.60	1.32
2	60.30	152.4	19.10	25.40	25.40	77.70	91.90	4	19.10	120.7	2.06
21/2	73.00	177.8	22.40	28.40	28.40	90.40	104.6	4	19.10	139.7	3.28
3	88.90	190.5	23.90	30.20	30.20	108.0	127	4	19.10	152.4	3.85
31/2	101.60	215.9	23.90	31.75	31.75	122.2	139.7	8	19.10	177.8	4.81
4	114.30	228.6	23.90	33.30	33.30	134.9	157.2	8	19.10	190.5	5.3
5	141.30	254.0	23.90	36.60	36.60	163.6	185.7	8	22.40	215.9	6.07
6	168.30	279.4	25.40	39.60	39.60	192.0	215.9	8	22.40	241.3	7.45
8	219.10	342.9	28.40	44.50	44.50	246.1	269.7	8	22.40	298.5	12.1
10	273.00	406.4	30.20	49.30	49.30	304.8	323.9	12	25.40	362.0	16.5
12	323.80	482.6	31.75	55.60	55.60	365.3	381.0	12	25.40	431.8	26.2
14	355.60	533.4	35.10	57.15	57.15	400.1	412.7	12	28.40	476.3	34.6
16	406.40	596.9	36.60	63.50	63.50	457.2	469.9	16	28.40	539.8	44.8
18	457.20	635	39.60	68.30	68.30	505.0	533.4	16	31.75	577.9	48.9
20	508.00	698.5	42.90	73.15	73.15	558.8	584.2	20	31.75	635.0	61.9
24	609.60	812.8	47.80	82.60	82.60	663.4	692.2	20	35.10	749.3	86.9

ASME B16.5 threaded flanges are available in a range of pressure classes, including 150, 300, 400, 600, 900, 1500 and 2500 pounds. For a complete list of specifications and other product parameters, please follow the link below.

ASME B16.5 Class 300 threaded Flange Dimension

ASME B16.5 Class 400 threaded Flange Dimension

ASME B16.5 Class 600 threaded Flange Dimension

ASME B16.5 Class 900 threaded Flange Dimension

ASME B16.5 Class 1500 threaded Flange Dimension

ASME B16.5 Class 2500 threaded Flange Dimension

Inspection of Galvanized Threaded Flange

Flange outer diameter and thickness

Measure the ASTM A694 threaded flange outer diameter with vernier calipers or micrometers, and measure the thickness with a depth gauge to ensure the radial adaptability of the flange to the pipeline and the gasket, and the thickness is up to the standard to ensure the compressive strength.

Flange inner diameter

Measure the inner diameter with micrometer or special inner diameter gauge to ensure a close fit with the outer diameter of the pipeline and prevent the installation gap caused by the deviation of the inner diameter, which will affect the sealing effect.

Bolt hole center circle diameter

Measure the symmetrical bolt hole spacing to calculate the PCD, hole diameter gauge to detect the hole diameter, to ensure uniform distribution and fastening of bolts, to prevent deviation due to the PCD leads to uneven stress on the bolts (such as unilateral stress is too large to cause fracture), or the hole diameter is too small to affect the installation.

Number and position of bolt holes

Check whether the number of bolt holes is correct, whether the distribution is uniform, whether the symmetry is accurate, to ensure the consistency of assembly and uniform force, to avoid assembly offset, connection is not secure.

Flange end surface flatness

Measure the maximum deviation between two planes of the flange (usually the sealing surface), to avoid bad sealing and ensure that it fits perfectly with the paired flanges or gaskets.

Areas of application

Oil and gas industry

wellhead units, oil/gas pipelines, refinery equipment.

Chemical and pharmaceutical industry

tank connections, corrosive media transportation piping.

Heating and Drainage Systems

high-rise building heating piping, municipal water supply and drainage networks, fire sprinkler systems.

Power and energy industry

power plant circulating water piping, gas turbine fuel supply system, auxiliary piping for nuclear power plants.

Machinery and equipment manufacturing

compressor import and export, hydraulic system piping, ship piping.

ZIZI specializes in the production of threaded flanges of various materials, which are widely used in many industries such as petroleum, chemical, electric power, shipbuilding, pharmaceutical, food, construction and so on. The company has advanced production equipment and perfect testing means, including multiple cold drawing machines, cold rolling machines, automatic welding equipment, hydraulic testing machines, spectral analyzers, non-destructive testing equipment, etc., to ensure that each flange meets the relevant standards at home and abroad.