Views: 2 Author: Site Editor Publish Time: 2026-04-13 Origin: Site
ASME B16.5 is a standard established by the American Society of Mechanical Engineers for pipe flanges and flange connections. It specifies detailed dimensions, pressure ratings, materials, and facing types for flanges to meet various industrial applications. ASME B16.5 Class 300 flanges, as an important type, are widely used in industries such as oil, chemical, natural gas, power, pharmaceutical, and food.
The ASME B16.5 standard includes various flange types, each with specific design features, applications, and manufacturing requirements. Commonly used forged flange types in industrial piping systems include: Weld neck flange (WN), Slip on flange (SO), Blind flange (BL), Socket weld flange (SW), Threaded flange (TH), and Lap joint flange (LAPJ). Each type has unique design characteristics and applications.
Types | Weld Neck Flange、Slip on Flange、Socket Weld Flange、Threaded Flange、Lap Joint Flange、Blind Flange |
Sealing Face | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
Size | 1/2"- 24" / DN15 - DN600 |
Standard | ASME B16.5 |
Carbon Steel | ASTM A105,P235GH,ASTM A350 LF2, 16Mn,P250GH,P280GH,ASTM A694 F42 / 46 / 56 / 60 / 65 |
Alloy Steel | STM A182 F11 / 12 / 5 / 9 / 91 / 92 |
Stainless Steel | ASTM A182 F304/304L/304H, 316/316L, 310S, 317,347,904L |
Duplex Stainless Steel | ASTM A182 F51, F53, F44 |
The flange sealing face is the contact surface between two flanges in a connection. It can be flat, raised, tongue-and-groove, etc. By using gaskets and bolts, the two flange faces are tightly joined to ensure sealing and prevent medium leakage, enabling safe and reliable transport.
Class 300 pipe flange sealing faces include seven types: FF (Flat Face), RF (Raised Face), RTJ (Ring Type Joint), M (Male), FM (Female), T (Tongue), and G (Groove). Among them, FF, RF, and RTJ are more common.
Flat Face (FF):Common in flat face flanges, with a smooth surface, simple design, easy processing. Large contact area with gasket, requiring high compression force. Used in high-pressure or high-temperature piping. Disadvantages: gasket placement is difficult during installation; gasket tends to extend or move sideways after pre-tightening.
Raised Face (RF):Widely used with non-metallic flat gaskets, clad gaskets, metal jacketed gaskets, and spiral wound gaskets. A raised smooth surface that can also have serrated concentric grooves. Provides a real-time seal under pressure. Disadvantage: large contact area makes gasket squeeze out sideways and difficult to compress tightly.
Ring Type Joint (RTJ):High-precision all-metal sealing face designed for high pressure and temperature, suitable for extreme conditions. Available in various materials (stainless steel, carbon steel) with excellent mechanical properties and corrosion resistance. Cross-section shapes: oval and octagonal. Good sealing performance, easy to install and remove for frequent operations. Disadvantages: complex processing, higher cost than FF and RF.
ASME B16.5 specifies steel types suitable for different pressure ratings and service conditions, such as carbon steel, alloy steel, and stainless steel, with clear requirements for chemical composition and mechanical properties. For special materials or environments (e.g., corrosion resistance or high temperature), additional standards like ASTM A182 may apply.
As a professional flange manufacturer, we offer ASME B16.5 flanges in various materials:
Stainless Steel
ASTM/ASME A/SA182 F304, F304L, F316, F316L, F321, F904L, F310S,DIN 1.4301, DIN 1.4306, DIN 1.4401, DIN 1.4404, DIN 1.4308, DIN 1.4408, DIN 1.4306, DIN 1.4409
Chemical Composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Ni | Cr | Mo | N | Cu |
| ASTM A182 F304 | MIN | 8.0 | 18.0 | ||||||||
| MAX | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 11.0 | 20.0 | 0.10 | |||
| ASTM A182 F316 | MIN | 10.00 | 16.00 | 2.00 | |||||||
| MAX | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 14.00 | 18.00 | 3.00 | 0.01 | ||
| ASTM A182 F904L (N08904) | MIN | 23.00 | 19.00 | 4.00 | 1.00 | ||||||
| MAX | 0.02 | 2.00 | 0.040 | 0.030 | 1.00 | 28.00 | 23.00 | 5.00 | 0.10 | 2.00 |
Mechanical Properties
| MATERIAL | T.S (MPA) | Y.S (MPA) | EL % | R/A % |
| ASTM A182 F304 | 515 min | 205 min | 30 min | 50 min |
| ASTM A182 F316 | 515 min | 205 min | 30 min | 50 min |
| ASTM A182 F904L (N08904) | 490 min | 215 min | 35 min |
Carbon Steel
ASTM/ASME A/SA105 A/SA105N, DIN 1.0402, DIN 1.0460, DIN 1.0619,ASTM A350 LF2 / LF3, ASTM A694 / A694 F52 / F56 / F60 / F65 / F70 / F80
Chemical Composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Cu | Ni | Cr | Mo | V |
| ASTM A105 | MIN | 0.60 | 0.10 | ||||||||
| MAX | 0.35 | 1.05 | 0.035 | 0.040 | 0.35 | 0.40 | 0.40 | 0.30 | 0.12 | 0.08 |
Mechanical Properties
| MATERIAL | T.S (MPA) | Y.S (MPA) | EL % | R/A % | HARDNESS |
| ASTM A105 | 485 min | 250 min | 22 min | 30 min | 197 max |
Alloy Steel
ASTM A182 / ASME SA182 F5, F9, F11, F12, F22, F91
Chemical Composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Ni | Cr | Mo |
| ASTM A182 F5 | MIN | 0.30 | 4.00 | 0.44 | |||||
| MAX | 0.15 | 0.60 | 0.030 | 0.030 | 0.50 | 0.50 | 6.00 | 0.65 | |
| ASTM A182 F9 | MIN | 0.30 | 0.50 | 8.00 | 0.90 | ||||
| MAX | 0.15 | 0.60 | 0.030 | 0.030 | 1.00 | 10.00 | 1.10 | ||
| ASTM A182 F12 CL1 | MIN | 0.05 | 0.30 | 0.80 | 0.44 | ||||
| MAX | 0.15 | 0.60 | 0.45 | 0.45 | 0.50 | 1.25 | 0.65 | ||
| ASTM A182 F12 CL2 | MIN | 0.10 | 0.30 | 0.10 | 0.80 | 0.44 | |||
| MAX | 0.20 | 0.80 | 0.40 | 0.40 | 0.60 | 1.25 | 0.65 | ||
| ASTM A182 F11 CL1 | MIN | 0.05 | 0.30 | 0.50 | 1.00 | 0.44 | |||
| MAX | 0.15 | 0.60 | 0.03 | 0.03 | 1.00 | 1.50 | 0.65 | ||
| ASTM A182 F11 CL2 | MIN | 0.10 | 0.30 | 0.50 | 1.00 | 0.44 | |||
| MAX | 0.20 | 0.80 | 0.04 | 0.04 | 1.00 | 1.50 | 0.65 | ||
| ASTM A182 F11 CL3 | MIN | 0.05 | 0.30 | 0.50 | 1.00 | 0.44 | |||
| MAX | 0.15 | 0.60 | 0.03 | 0.03 | 1.00 | 1.50 | 0.65 |
Mechanical Properties
| MATERIAL | ASTM A182 F5 | ASTM A182 F9 | ASTM A182 F12 CL1 | ASTM A182 F12 CL2 | ASTM A182 F11 CL1 | ASTM A182 F11 CL2 | ASTM A182 F11 CL3 |
| T.S (MPA) | 485 min | 585 min | 415 min | 485 min | 415 min | 485 min | 515 min |
| Y.S (MPA) | 275 min | 380 min | 220 min | 275 min | 205 min | 275 min | 310 min |
| EL % | 20 min | 20 min | 20 min | 20 min | 20 min | 20 min | 20 min |
| R/A % | 35 min | 40 min | 45 min | 30 min | 45 min | 30 min | 30 min |
| HARDNESS | 143-217 | 179-217 | 121-174 | 143-207 | 121-174 | 143-207 | 150-207 |
Duplex Stainless Steel
S31803 / S32205 / S32750 / S32760 ASTM A182 F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Chemical Composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Ni | Cr | Mo | N | Cu | W |
| ASTM A182 F51 | MIN | 4.50 | 21.00 | 2.50 | 0.08 | |||||||
| MAX | 0.03 | 2.00 | 0.030 | 0.020 | 1.00 | 6.50 | 23.00 | 3.50 | 0.20 | |||
| ASTM A182 F53 | MIN | 6.00 | 24.00 | 3.00 | 0.24 | |||||||
| MAX | 0.03 | 1.20 | 0.035 | 0.020 | 0.80 | 8.00 | 26.00 | 5.00 | 0.32 | 0.50 | ||
| ASTM A182 F55 | MIN | 6.00 | 24.00 | 3.00 | 0.20 | 0.50 | 0.50 | |||||
| MAX | 0.03 | 1.00 | 0.030 | 0.010 | 1.00 | 8.00 | 26.00 | 4.00 | 0.30 | 1.00 | 1.00 |
Mechanical Properties
| MATERIAL | ASTM A182 F51 | ASTM A182 F53 | ASTM A182 F55 |
| T.S (MPA) | 620 min | 800 min | 750-895 |
| Y.S (MPA) | 450 min | 550 min | 550 min |
| EL % | 15 min | 25 min | 25 min |
| R/A % | 15 min | 45 min | |
| HARDNESS | 310 max |
| Nominal Pipe Size | A | B | C | D | E | F | G | H | I | J | Weight | |
| inch | mm | mm | mm | mm | mm | mm | mm | mm | Holes | mm | mm | kg / piece |
| 1/2 | 21.30 | 95.20 | 15.70 | 14.20 | 52.30 | 21.30 | 38.10 | 35.00 | 4 | 15.70 | 66.55 | 0.75 |
| 3/4 | 26.70 | 117.3 | 20.80 | 15.70 | 57.15 | 26.70 | 47.70 | 42.90 | 4 | 19.00 | 82.50 | 1.26 |
| 1 | 33.40 | 123.9 | 26.70 | 17.50 | 62.00 | 33.50 | 53.80 | 50.80 | 4 | 19.00 | 88.90 | 1.52 |
| 1 1/4 | 42.20 | 133.3 | 35.10 | 19.00 | 65.00 | 42.20 | 63.50 | 63.50 | 4 | 19.00 | 98.50 | 2.03 |
| 1 1/2 | 48.30 | 155.4 | 40.90 | 20.60 | 68.30 | 48.30 | 69.85 | 73. 15 | 4 | 22.30 | 114.3 | 2.89 |
| 2 | 60.30 | 165. 1 | 52.60 | 22.30 | 69.85 | 60.45 | 84.00 | 91.90 | 8 | 19.00 | 127.0 | 3.4 |
| 2 1/2 | 73.00 | 190.5 | 62.70 | 25.40 | 76.20 | 73.15 | 100.0 | 104.6 | 8 | 22.30 | 149.3 | 5.17 |
| 3 | 88.90 | 209.5 | 78.00 | 28.40 | 79.25 | 88.90 | 117.3 | 127.0 | 8 | 22.30 | 168.1 | 6.93 |
| 3 1/2 | 101.6 | 228.6 | 90.20 | 30.20 | 81.00 | 101.6 | 133.3 | 139.7 | 8 | 22.30 | 184.1 | 8.67 |
| 4 | 114.3 | 254.0 | 102.4 | 31.70 | 85.80 | 114.3 | 146.0 | 157.2 | 8 | 22.30 | 200.1 | 11.2 |
| 5 | 141.3 | 279.4 | 128.3 | 35.00 | 98.50 | 141.2 | 177.8 | 185.7 | 8 | 22.30 | 234.9 | 15.1 |
| 6 | 168.3 | 317.5 | 154.2 | 36.50 | 98.50 | 168.4 | 206.2 | 215.9 | 12 | 22.30 | 269.7 | 19.1 |
| 8 | 219.1 | 381.0 | 202.7 | 41.10 | 111.2 | 219.2 | 260.3 | 269.7 | 12 | 25.40 | 330.2 | 29.9 |
| 10 | 273.0 | 444.5 | 254.5 | 47.70 | 117.3 | 273.0 | 320.5 | 323.8 | 16 | 28.40 | 387.3 | 42.7 |
| 12 | 323.8 | 520.7 | 304.8 | 50.80 | 130.0 | 323.8 | 374.6 | 381.0 | 16 | 31.70 | 450.8 | 61.8 |
| 14 | 355.6 | 584.2 | To be specified by the Purchaser | 53.80 | 142.7 | 355.6 | 425.4 | 412.7 | 20 | 31.70 | 514.3 | 85.8 |
| 16 | 406.4 | 647.7 | 57.15 | 146.0 | 406.4 | 482.6 | 469.9 | 20 | 35.00 | 571.5 | 106 | |
| 18 | 457.2 | 711.2 | 60.45 | 158.7 | 457.2 | 533.4 | 533.4 | 24 | 35.00 | 628.6 | 131 | |
| 20 | 508.0 | 774.7 | 63.50 | 162.0 | 508.0 | 587.2 | 584.2 | 24 | 35.00 | 685.8 | 158 | |
| 24 | 609.6 | 914.4 | 69.85 | 168.1 | 609.6 | 701.5 | 692.1 | 24 | 41.10 | 812.8 | 230 | |
| Nominal Pipe Size | A | B | C | D | F | G | H | I | J | Weight | |
| inch | mm | mm | mm | mm | mm | mm | mm | Holes | mm | mm | kg / piece |
| 1/2 | 21.3 | 95.2 | 22.4 | 14.2 | 22.4 | 38.1 | 35.1 | 4 | 15.7 | 66.55 | 0.64 |
| 3/4 | 26.7 | 117.3 | 27.7 | 15.7 | 25.4 | 47.7 | 42.9 | 4 | 19.1 | 82.5 | 1. 12 |
| 1 | 33.4 | 123.9 | 34.5 | 17.5 | 26.9 | 53.8 | 50.8 | 4 | 19.1 | 88.9 | 1.36 |
| 11/4 | 42.2 | 133.3 | 43.2 | 19 | 26.9 | 63.5 | 63.5 | 4 | 19.1 | 98.6 | 1.68 |
| 11/2 | 48.3 | 155.4 | 49.5 | 20.6 | 30.2 | 69.85 | 73.15 | 4 | 22.4 | 114.3 | 2.49 |
| 2 | 60.3 | 165.1 | 62 | 22.3 | 33.2 | 84 | 91.9 | 8 | 19.1 | 127 | 2.87 |
| 21/2 | 73.0 | 190.5 | 74.7 | 25.4 | 38.1 | 100 | 104.6 | 8 | 22.4 | 149.4 | 4.32 |
| 3 | 88.9 | 209.5 | 90.7 | 28.4 | 42.9 | 117.3 | 127 | 8 | 22.4 | 168.1 | 5.85 |
| 31/2 | 101.6 | 228.6 | 103.4 | 30.2 | 44.4 | 133.3 | 139.7 | 8 | 22.4 | 184.2 | 7.34 |
| 4 | 114.3 | 254 | 116.1 | 31.7 | 47.7 | 146 | 157.2 | 8 | 22.4 | 200.1 | 9.61 |
| 5 | 141.3 | 279.4 | 143.8 | 35 | 50.8 | 177.8 | 185.7 | 8 | 22.4 | 234.9 | 12.3 |
| 6 | 168.3 | 317.5 | 170.7 | 36.5 | 52.3 | 206.2 | 215.9 | 12 | 22.4 | 269.7 | 15.6 |
| 8 | 219. 1 | 381 | 221.5 | 41.1 | 61.9 | 260.3 | 269.7 | 12 | 25.4 | 330.2 | 24.2 |
| 10 | 273.0 | 444.5 | 276.3 | 47.7 | 66.55 | 320.5 | 323.9 | 16 | 28.4 | 387.3 | 34.1 |
| 12 | 323.8 | 520.7 | 327.1 | 50.8 | 73.15 | 374.6 | 381 | 16 | 31.7 | 450.8 | 49.8 |
| 14 | 355.6 | 584.2 | 359.1 | 53.8 | 76.2 | 425.4 | 412.8 | 20 | 31.7 | 514.4 | 69.9 |
| 16 | 406.4 | 647.7 | 410.5 | 57.15 | 82.5 | 482.6 | 469.9 | 20 | 35 | 571.5 | 88.1 |
| 18 | 457.2 | 711.2 | 461.8 | 60.45 | 88.9 | 533.4 | 533.4 | 24 | 35 | 628.7 | 109 |
| 20 | 508.0 | 774.7 | 513.1 | 63.5 | 95.2 | 587.2 | 584.2 | 24 | 35 | 685.8 | 134 |
| 24 | 609.6 | 914.4 | 616 | 69.85 | 106.4 | 701.5 | 692.2 | 24 | 41 | 812.8 | 201 |
| Nominal Pipe Size | A | B | C | D | E | K | F | G | H | I | J | Weight | |
| inch | mm | mm | mm | mm | mm | mm | mm | mm | mm | Holes | mm | mm | kg / piece |
| 1/2 | 21.30 | 95.20 | 15.70 | 14.20 | 22.30 | 22.40 | 9.60 | 38.10 | 35.10 | 4 | 15.70 | 66.55 | 0.66 |
| 3/4 | 26.70 | 117.3 | 20.80 | 15.70 | 25.40 | 27.70 | 11.10 | 47.70 | 42.90 | 4 | 19.10 | 82.50 | 1.15 |
| 1 | 33.40 | 123.9 | 26.70 | 17.50 | 26.90 | 34.50 | 12.70 | 53.80 | 50.80 | 4 | 19.10 | 88.90 | 1.40 |
| 11/4 | 42.20 | 133.3 | 35.10 | 19.00 | 26.90 | 43.20 | 14.20 | 63.50 | 63.50 | 4 | 19.10 | 98.60 | 1.75 |
| 11/2 | 48.30 | 155.4 | 40.90 | 20.60 | 30.20 | 49.50 | 15.70 | 69.85 | 73.15 | 4 | 22.30 | 114.3 | 2.55 |
| 2 | 60.30 | 165.1 | 52.60 | 22.30 | 33.20 | 62.00 | 17.50 | 84.00 | 91.90 | 8 | 19.10 | 127.0 | 2.93 |
| 21/2 | 73.00 | 190.5 | 62.70 | 25.40 | 38.10 | 74.70 | 19.00 | 100.0 | 104.6 | 8 | 22.30 | 149.3 | 4.40 |
| 3 | 88.90 | 209.5 | 78.00 | 28.40 | 42.90 | 90.70 | 20.60 | 117.3 | 127.0 | 8 | 22.30 | 168. 1 | 5.92 |
| Nominal Pipe Size | A | B | C | D | E | F | G | H | I | J | Weight | |
| inch | mm | mm | mm | mm | mm | mm | mm | mm | Holes | mm | mm | kg / piece |
| 1/2 | 21.30 | 95.20 | 23.60 | 14.20 | 22.30 | 15.70 | 38.10 | 35.00 | 4 | 15.70 | 66.55 | 0.64 |
| 3/4 | 26.70 | 117.3 | 29.00 | 15.70 | 25.40 | 15.70 | 47.70 | 42.90 | 4 | 19.00 | 82.50 | 1.12 |
| 1 | 33.40 | 123.9 | 35.80 | 17.50 | 26.90 | 17.50 | 53.80 | 50.80 | 4 | 19.00 | 88.90 | 1.36 |
| 11/4 | 42.20 | 133.3 | 44.40 | 19.00 | 26.90 | 20.60 | 63.50 | 63.50 | 4 | 19.00 | 98.50 | 1.68 |
| 11/2 | 48.30 | 155.4 | 50.50 | 20.60 | 30.20 | 22.30 | 69.85 | 73. 15 | 4 | 22.30 | 114.3 | 2.49 |
| 2 | 60.30 | 165.1 | 63.50 | 22.30 | 33.20 | 28.40 | 84.00 | 91.90 | 8 | 19.00 | 127.0 | 2.87 |
| 21/2 | 73.00 | 190.5 | 76.20 | 25.40 | 38. 10 | 31.70 | 100.0 | 104.6 | 8 | 22.30 | 149.3 | 4.32 |
| 3 | 88.90 | 209.5 | 92.20 | 28.40 | 42.90 | 31.70 | 117.3 | 127.0 | 8 | 22.30 | 168.1 | 5.85 |
| 31/2 | 101.6 | 228.6 | 104.9 | 30.20 | 44.40 | 36.50 | 133.3 | 139.7 | 8 | 22.30 | 184.1 | 7.34 |
| 4 | 114.3 | 254.0 | 117.6 | 31.70 | 47.70 | 36.50 | 146.0 | 157.2 | 8 | 22.30 | 200.1 | 9.61 |
| 5 | 141.3 | 279.4 | 144.5 | 35.00 | 50.80 | 42.90 | 177.8 | 185.7 | 8 | 22.30 | 234.9 | 12.3 |
| 6 | 168.3 | 317.5 | 171.4 | 36.50 | 52.30 | 45.90 | 206.2 | 215.9 | 12 | 22.30 | 269.7 | 15.6 |
| 8 | 219.1 | 381.0 | 222.2 | 41.10 | 61.90 | 50.80 | 260.3 | 269.7 | 12 | 25.40 | 330.2 | 24.2 |
| 10 | 273.0 | 444.5 | 276.3 | 47.70 | 66.55 | 55.60 | 320.5 | 323.9 | 16 | 28.40 | 387.3 | 34.1 |
| 12 | 323.8 | 520.7 | 328.7 | 50.80 | 73. 15 | 60.45 | 374.6 | 381.0 | 16 | 31.70 | 450.8 | 49.8 |
| 14 | 355.6 | 584.2 | 360.4 | 53.80 | 76.20 | 63.50 | 425.4 | 412.7 | 20 | 31.70 | 514.3 | 69.9 |
| 16 | 406.4 | 647.7 | 411.2 | 57.15 | 82.50 | 68.30 | 482.6 | 469.9 | 20 | 35.00 | 571.5 | 88.1 |
| 18 | 457.2 | 711.2 | 462.0 | 60.45 | 88.90 | 69.85 | 533.4 | 533.4 | 24 | 35.00 | 628.6 | 109 |
| 20 | 508.0 | 774.7 | 512.8 | 63.50 | 95.20 | 73.15 | 587.2 | 584.2 | 24 | 35.00 | 685.8 | 134 |
| 24 | 609.6 | 914.4 | 614.4 | 69.85 | 106.4 | 82.50 | 701.5 | 692.2 | 24 | 41.10 | 812.8 | 201 |
| Nominal Pipe Size | A | B | C | D | R | F | H | I | J | Weight | ||
| inch | mm | mm | mm | mm | mm | mm | mm | Holes | mm | mm | kg / piece | |
| 1/2 | 21.30 | 95.20 | 22.90 | 14.20 | 22.30 | 3.000 | 38.10 | 4 | 15.70 | 66.55 | 0.62 | |
| 3/4 | 26.70 | 117.3 | 28.20 | 15.70 | 25.40 | 3.000 | 47.70 | 4 | 19.00 | 82.50 | 1.10 | |
| 1 | 33.40 | 123.9 | 35.10 | 17.50 | 26.90 | 3.000 | 53.80 | 4 | 19.0 | 88.90 | 1.33 | |
| 11/4 | 42.20 | 133.3 | 43.70 | 19.00 | 26.90 | 4.800 | 63.50 | 4 | 19.00 | 98.50 | 1.65 | |
| 11/2 | 48.30 | 155.4 | 50.00 | 20.60 | 30.20 | 6.400 | 69.85 | 4 | 22.30 | 114.3 | 2.44 | |
| 2 | 60.30 | 165.1 | 62.50 | 22.30 | 33.20 | 7.900 | 84.00 | 8 | 19.10 | 127.0 | 2.83 | |
| 21/2 | 73.00 | 190.5 | 75.40 | 25.40 | 38.10 | 7.900 | 100.0 | 8 | 22.30 | 149.3 | 4.25 | |
| 3 | 88.90 | 209.5 | 91.40 | 28.40 | 42.90 | 9.700 | 117.3 | 8 | 22.30 | 168.1 | 5.78 | |
| 31/2 | 101.6 | 228.6 | 104.1 | 30.20 | 44.40 | 9.700 | 133.3 | 8 | 22.30 | 184.1 | 7.27 | |
| 4 | 114.3 | 254.0 | 116.8 | 31.70 | 47.70 | 11.20 | 146.0 | 8 | 22.30 | 200.1 | 9.55 | |
| 5 | 141.3 | 279.4 | 114.5 | 35.0 | 50.80 | 11.20 | 177.8 | 8 | 22.30 | 234.9 | 12.2 | |
| 6 | 168.3 | 317.5 | 171.5 | 36.50 | 52.30 | 12.70 | 206.2 | 12 | 22.30 | 269.7 | 15.5 | |
| 8 | 219.1 | 381.0 | 222.3 | 41. 10 | 61.90 | 12.70 | 260.3 | 12 | 25.40 | 330.2 | 24.1 | |
| 10 | 273.0 | 444.5 | 277.4 | 47.70 | 95.20 | 12.70 | 320.5 | 16 | 28.40 | 387.3 | 34.4 | |
| 12 | 323.8 | 520.7 | 328.2 | 50.80 | 101.6 | 12.70 | 374.6 | 16 | 31.70 | 450.8 | 50.4 | |
| 14 | 355.6 | 584.2 | 360.2 | 53.80 | 111.2 | 12.70 | 425.4 | 20 | 31.70 | 514.3 | 70.9 | |
| 16 | 406.4 | 647.7 | 411.2 | 57. 15 | 120.6 | 12.70 | 482.6 | 20 | 35.00 | 571.5 | 89.5 | |
| 18 | 457.2 | 711.2 | 462.3 | 60.45 | 130.0 | 12.70 | 533.4 | 24 | 35.00 | 628.6 | 111 | |
| 20 | 508.0 | 774.7 | 514.4 | 63.50 | 139.7 | 12.70 | 587.2 | 24 | 35.00 | 685.8 | 137 | |
| 24 | 609.6 | 914.4 | 616.0 | 69.8 | 152.4 | 12.70 | 701.5 | 24 | 41.10 | 812.8 | 204 | |
| Nominal Pipe Size | A | C | G | H | I | J | Weight | |
| inch | mm | mm | mm | mm | Holes | mm | mm | kg / piece |
| 1/2 | 21.3 | 95.2 | 14.2 | 35.1 | 4 | 15.7 | 66.55 | 0.64 |
| 3/4 | 26.7 | 117.3 | 15.7 | 42.9 | 4 | 19 | 82.5 | 1.11 |
| 1 | 33.4 | 123.9 | 17.5 | 50.8 | 4 | 19 | 88.9 | 1.39 |
| 11/4 | 42.2 | 133.3 | 19 | 63.5 | 4 | 19 | 98.5 | 1.79 |
| 11/2 | 48.3 | 155.4 | 20.6 | 73.15 | 4 | 22.3 | 114.3 | 2.66 |
| 2 | 60.3 | 165. 1 | 22.3 | 91.9 | 8 | 19. 1 | 127 | 3.18 |
| 21/2 | 73.0 | 190.5 | 25.4 | 104.6 | 8 | 22.3 | 149.3 | 4.85 |
| 3 | 88.9 | 209.5 | 28.4 | 127 | 8 | 22.3 | 168.1 | 6.81 |
| 31/2 | 101.6 | 228.6 | 30.2 | 139.7 | 8 | 22.3 | 184.1 | 8.71 |
| 4 | 114.3 | 254 | 31.7 | 157.2 | 8 | 22.3 | 200.1 | 11.5 |
| 5 | 141.3 | 279.4 | 35 | 185.7 | 8 | 22.3 | 234.9 | 15.6 |
| 6 | 168.3 | 317.5 | 36.5 | 215.9 | 12 | 22.3 | 269.7 | 20.9 |
| 8 | 219. 1 | 381 | 41.10 | 269.7 | 12 | 25.4 | 330.2 | 34.3 |
| 10 | 273.0 | 444.5 | 47.7 | 323.9 | 16 | 28.4 | 387.3 | 53.3 |
| 12 | 323.8 | 520.7 | 50.8 | 381 | 16 | 31.7 | 450.8 | 78.8 |
| 14 | 355.6 | 584.2 | 53.8 | 412.8 | 20 | 31.7 | 514.3 | 105 |
| 16 | 406.4 | 647.7 | 57.15 | 469.9 | 20 | 35 | 571.5 | 137 |
| 18 | 457.2 | 711.2 | 60.45 | 533.4 | 24 | 35 | 628.6 | 175 |
| 20 | 508.0 | 774.7 | 63.5 | 584.2 | 24 | 35 | 685.8 | 221 |
| 24 | 609.6 | 914.4 | 69.85 | 692.2 | 24 | 41. 10 | 812.8 | 339 |
Moderate pressure rating: Suitable for medium-pressure piping systems, typically working pressure of 150 to 300 psi.
Diverse materials and sealing faces: Can be made of carbon steel, stainless steel, etc., with multiple face types (RF, FM, M, RJ) to suit various needs.
Good sealing performance: Designed with proper sealing structure and quality materials to prevent leakage.
Easy installation and maintenance: Standard dimensions and connection methods ensure simplicity and good interchangeability, reducing maintenance and replacement costs.
ASME B16.5 pipe flanges are widely used in oil, chemical, natural gas, power, pharmaceutical, food, and other industries. Class 300 flanges play a key role in ensuring safe and stable operation of piping systems.
