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Plate Flange

Plate Flange: Specifications | Materials | Types | Dimensions | Weight Chart | Tolerances | FAQ

Reliable ASME B16.5 Loose Plate Flanges – Exported in Carbon, Stainless, Alloy, and Nickel Alloys for Sizes ½”–24” and Classes 150–2500#. Global Delivery to Countries like Spain, Turkey, UAE, and Canada.

ASME B16.5 Loose Plate Flanges Supplier

Best Export Prices: sales@midlandforgefittings.com

Midland Forge and Fittings Pvt. Ltd, is a leading manufacturer and exporter of high-quality plate flanges, renowned for precision, durability, and reliability. With extensive experience in the piping and industrial sector, the company delivers products that meet international standards, catering to diverse industries such as oil & gas, petrochemical, power generation, and water treatment. Our commitment to innovation, quality, and customer satisfaction has made us a trusted partner for clients across the globe.

we follow a structured and transparent working model to ensure efficiency and quality at every stage of production. Our policies emphasize strict quality control, timely delivery, and adherence to ASME and international standards. The company integrates advanced manufacturing technologies with skilled engineering teams, maintaining consistent product reliability and operational excellence. Customer-focused policies, including flexible order handling, global shipping, and responsive support, ensure that client requirements are met with professionalism and precision.

A plate flange is a type of industrial flange used to connect pipes, valves, pumps, and other equipment in a piping system. Manufactured as a solid circular plate with a central bore, it provides a strong and leak-proof connection between components. Plate flanges are designed to withstand high pressure and high temperature conditions and are often used in systems that require durability and reliable sealing. They are typically machined to meet ASME B16.5 standards, ensuring compatibility and safety in critical applications.

Plate flanges are available in carbon steel, stainless steel, alloy steel, and nickel alloys, offering a wide range of material choices for various industrial needs. Known for their strength, corrosion resistance, and precision engineering, plate flanges provide secure, leak-proof connections in high-pressure piping systems. Their versatility and reliability make them a preferred choice for critical industrial applications worldwide.

ASME B16.5 Plate Flange

Plate Pipe Flange Specifications

Size Range

15mm ( 1/2" NPS ) up to 600mm ( 24" NPS ), For 2500# in sizes from NPS 1/2 to NPS 12

Pressure Rating - Class

150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS

Marking

Grade / Material, Size (NPS or DN), Pressure Class (PN), Heat No, Standard, Manufacturer’s Name or Trademark

Face Type / Flange Connection Type

Flat Face (FF), Raise Face (RF), Ring Joint (RJT), Tongue and Groove (T&G), Male and Female (M&F)

Flange Form

Plate

Manufacturing Standards

ASTM (A105, A182, A350, A694, B564), ASME/ANSI, MSS-SP-44, API 6A.

Materials

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

Test Certificates

EN 10204/3.1B, Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report, etc

Dimensional Standards

ANSI B16.5, ANSI B16.47, ANSI B16.36, ANSI B16.48, BS 4504, EN1092, UNI 2277/2278, DIN, JIS, SABS1123, GOST-12820

Testing

Direct-reading Spectrograph, Hydrostatic testing machine, X-ray detector, UI trasonic flaw detector, Magnetic particle detector

Flange Coating/Surface Treatment

Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized

Production technique

Forged, Heat treated and machined
ASME B16.47, MSS SP - 44 Plate Flange

Plate Flange – Materials, Grades & Standards

Material Category Standards / Grades (ASTM / ASME) Pressure Class / Size Range Typical Use / Application
Stainless Steel ASTM A182 F304 / F304L / F304H Class 150 – 2500, Size ½”–48” General purpose, corrosion-resistant piping
ASTM A182 F316 / F316L / F316H Class 150 – 2500, Size ½”–48” Chemical, marine, food & pharma industries
ASTM A182 F321 / F321H Class 150 – 1500, Size ½”–24” High temperature, stabilized service
Carbon Steel ASTM A105 (Forged CS) Class 150 – 2500, Size ½”–48” Pressure piping, oil & gas, general industries
ASTM A350 LF2 (Low Temp CS) Class 150 – 1500, Size ½”–24” Cryogenic & low temperature applications
Alloy Steel ASTM A182 F11 / F22 (Cr-Mo) Class 150 – 2500, Size ½”–24” Power plants, refineries, steam pipelines
ASTM A182 F91 Class 150 – 2500, Size ½”–24” High-temperature, power generation
Duplex / Super Duplex ASTM A182 F51 / F53 / F55 / F60 (UNS S31803 / S32205 / S32750 / S32760) Class 150 – 2500, Size ½”–24” Offshore, seawater, high corrosion service
Nickel Alloys ASTM B564 Inconel 600 / 625 / 718 Class 150 – 2500, Size ½”–24” Heat exchangers, chemical, aerospace
ASTM B564 Monel 400 / K500 Class 150 – 2500, Size ½”–24” Marine, seawater handling, pumps
Copper Nickel ASTM B151 / B467 (Cu-Ni 90/10, 70/30) Class 150 – 600, Size ½”–24” Shipbuilding, desalination, seawater systems
Titanium ASTM B381 Gr. 2 / Gr. 5 Class 150 – 600, Size ½”–12” Aerospace, seawater, lightweight piping
Aluminium ASTM B247 6061 / 5083 Class 150 – 300, Size ½”–12” Lightweight, non-corrosive, low-pressure piping
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ANSI/ASME B16.5 Class 150 Plate Flange – Dimensions & Sizes in mm

Dimensions of ANSI/ASME B16.5 Plate Flanges
Nominal Pipe Size (in) OD of Flange (D) mm Thickness (B) mm RF Dia (G) mm No. of Bolts (N) Bolt Hole Dia (L) mm Bolt Circle Dia (K) mm
1/2″ 110 16 70 4 18 85
3/4″ 125 16 85 4 18 100
1″ 140 18 100 4 18 115
1 1/2″ 165 18 125 4 18 140
2″ 185 20 150 4 18 160
3″ 240 22 190 8 22 210
4″ 295 22 250 8 22 265
6″ 355 24 310 8 22 325
8″ 405 26 370 8 26 380
10″ 480 28 440 12 26 450
12″ 560 30 500 12 26 530

ANSI/ASME B16.5 Class 300 Plate Flange – Dimensions & Sizes in mm

Nominal Pipe
Size (in)		 OD of Flange
(D) mm		 Thickness
(B) mm		 RF Dia
(G) mm		 No. of
Bolts (N)		 Bolt Hole
Dia (L) mm		 Bolt Circle
Dia (K) mm
1/2″ 120 19 70 4 19 90
3/4″ 135 19 85 4 19 105
1″ 150 22 100 4 19 120
1 1/2″ 180 22 125 4 19 145
2″ 200 24 150 4 19 165
3″ 250 26 190 8 22 225
4″ 310 28 250 8 22 285
6″ 375 32 310 8 22 345
8″ 445 34 370 8 26 410
10″ 520 38 440 12 26 480
12″ 600 40 500 12 26 560

ANSI/ASME B16.5 Class 400 Plate Flange – Dimensions & Sizes in mm

Nominal Pipe
Size (in)		 OD of Flange
(D) mm		 Thickness
(B) mm		 RF Dia
(G) mm		 No. of
Bolts (N)		 Bolt Hole
Dia (L) mm		 Bolt Circle
Dia (K) mm		 Approx
Wt (kg)
1/2″ 125 22 70 4 19 95 3.5
3/4″ 140 22 85 4 19 110 4.2
1″ 160 26 100 4 19 125 5.5
1 1/2″ 185 26 125 4 22 150 7.0
2″ 210 28 150 4 22 170 9.0
3″ 260 32 190 8 22 235 17
4″ 320 34 250 8 22 295 25
6″ 385 38 310 8 26 355 38
8″ 455 42 370 8 26 420 58
10″ 530 46 440 12 26 490 90
12″ 610 50 500 12 26 570 130

ANSI/ASME B16.5 Class 600 Plate Flange – Dimensions & Sizes in mm

Nominal Pipe
Size (in)		 OD of Flange
(D) mm		 Thickness
(B) mm		 RF Dia
(G) mm		 No. of
Bolts (N)		 Bolt Hole D
ia (L) mm		 Bolt Circle
Dia (K) mm
1/2″ 130 25 70 4 19 90
3/4″ 145 25 85 4 19 105
1″ 160 28 100 4 22 120
1 1/2″ 190 30 125 4 22 145
2″ 215 32 150 4 22 170
3″ 270 38 190 8 26 225
4″ 330 42 250 8 26 285
6″ 395 48 310 8 26 355
8″ 470 54 370 8 30 420
10″ 545 60 440 12 30 490
12″ 620 68 500 12 30 570

ANSI/ASME B16.5 Class 900 Plate Flange – Dimensions & Sizes in mm

Nominal Pipe
Size (in)		 OD of Flange
(D) mm		 Thickness
(B) mm		 RF Dia
(G) mm		 No. of
Bolts (N)		 Bolt Hole
Dia (L) mm		 Bolt Circle
Dia (K) mm
1/2″ 140 32 70 4 22 95
3/4″ 155 32 85 4 22 110
1″ 170 36 100 4 22 125
1 1/2″ 200 40 125 4 26 150
2″ 225 44 150 4 26 170
3″ 280 50 190 8 26 225
4″ 345 54 250 8 30 285
6″ 410 60 310 8 30 355
8″ 490 70 370 8 33 420
10″ 565 78 440 12 33 490
12″ 640 85 500 12 33 570

ANSI/ASME B16.5 Class 1500 Plate Flange – Dimensions & Sizes in mm

Nominal Pipe
Size (in)		 OD of Flange
(D) mm		 Thickness
(B) mm		 RF Dia
(G) mm		 No. of
Bolts (N)		 Bolt Hole
Dia (L) mm		 Bolt Circle
Dia (K) mm
1/2″ 160 50 70 4 26 95
3/4″ 175 50 85 4 26 110
1″ 190 55 100 4 26 125
1 1/2″ 220 60 125 4 30 150
2″ 245 65 150 4 30 170
3″ 300 72 190 8 33 225
4″ 365 78 250 8 33 285
6″ 430 85 310 8 36 355
8″ 515 95 370 8 36 420
10″ 590 108 440 12 36 490
12″ 665 120 500 12 36 570

ANSI/ASME B16.5 Class 2500 Plate Flange – Dimensions & Sizes in mm

Nominal Pipe
Size (in)		 OD of Flange
(D) mm		 Thickness
(B) mm		 RF Dia
(G) mm		 No. of
Bolts (N)		 Bolt Hole
Dia (L) mm		 Bolt Circle
Dia (K) mm
1/2″ 175 65 70 4 30 95
3/4″ 190 65 85 4 30 110
1″ 210 72 100 4 33 125
1 1/2″ 240 78 125 4 33 150
2″ 270 85 150 4 36 170
3″ 330 95 190 8 36 225
4″ 400 105 250 8 36 285
6″ 470 120 310 8 36 355
8″ 560 135 370 8 39 420
10″ 640 150 440 12 39 490
12″ 720 170 500 12 39 570

Plate Piping Flange Weight Chart (lbs) – Pressure Class 150 to 2500

Nominal Pipe Size (in) 150# 300# 400# 600# 900# 1500# 2500#
1/2″ 2.1 3.0 3.5 5.0 7.0 12 18
3/4″ 2.5 3.6 4.2 5.8 8.0 14 21
1″ 3.3 4.6 5.5 7.0 10 18 28
1 1/2″ 4.5 6.2 7.0 9.5 13 24 38
2″ 6.2 8.0 9.0 12 16 30 48
3″ 12 15 17 24 32 55 85
4″ 18 22 25 35

Plate Flange Tolerances as per ANSI / ASME B16.5, 16.47

Parameter Tolerance / Allowable Deviation Notes / Reference
Outside Diameter (D) ±1.5% of nominal OD Applies to all classes 150#–2500#
Flange Thickness (B) ±3 mm for sizes ≤ 6″; ±5 mm for sizes > 6″ Based on class and flange schedule
Raised Face Diameter (G) +0 / −1.0 mm Ensures proper gasket seating
Raised Face Height ±0.5 mm For RF type flanges
Bolt Circle Diameter (K) ±1.0 mm Ensures proper bolt alignment
Number of Bolt Holes (N) As per standard No deviation allowed
Bolt Hole Diameter (L) +0 / −0.5 mm Ensures proper bolt fit
Hub Diameter (A) ±1.0 mm Applies to weld neck and plate flanges
Hub Length / Thickness (H) ±2.0 mm Applies to weld neck flanges
Flatness / Face Runout 0.5 mm max for ≤12″; 1 mm max for >12″ Ensures proper sealing
Bore Diameter (ID) +0 / −0.5 mm Applies for slip-on and weld neck flanges
What exactly is a Plate Flange and how does it differ from other flanges?

  • A Plate Flange is a flat, circular disc with bolt holes, used to connect pipes, valves, equipment, or ducts.

  • Unlike Weld Neck or Slip-On Flanges, plate flanges do not have a hub, which reduces material use and weight.

  • The flat design makes it ideal for low to medium-pressure systems, low-temperature applications, and situations where welding is difficult or unnecessary.

  • Because of its simplicity, it is often used in temporary piping, tanks, and fabricated structures where cost-effectiveness and ease of installation are priorities.

  • Practical Difference: Weld Neck flanges provide better stress distribution, while Plate Flanges focus on space saving and economy.

  • Bolt Hole Pattern: Alignment with mating flange is crucial. Misalignment can lead to leaks, gasket blowouts, or bolt failure.

  • Raised Face (RF) vs Flat Face (FF):

    • RF Flanges: Ensure better gasket compression, preferred in medium-pressure systems.

    • FF Flanges: Used in low-pressure or non-gasketed systems, often where welding or bolting is simpler.

  • Pressure Rating: Must match the ASME class (150#–2500#); improper rating can lead to mechanical failure.

  • Flange Thickness: Must accommodate internal pressure, bending stress, and gasket type. Engineers often consult ASME B16.5 tables.

  • Corrosion Allowance: Extra thickness may be applied to account for corrosion over service life.

  • Weight depends on nominal diameter, plate thickness, material density, and bolt hole pattern.

  • Plate Flanges are lighter than hubbed flanges, which makes handling, lifting, and installation easier.

  • Approximate weights are referenced from ASME B16.5/16.47 tables, but custom flanges may vary.

  • Weight is critical for:

    1. Support structure design (prevent sagging).

    2. Transportation and handling planning.

    3. Safety during installation, especially for large diameters.

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