Looking for durable and high-performing 300 lb flanges? Jizhong, a trusted name in industrial piping components, offers precision-engineered ANSI 300 lb flanges made from high-quality carbon steel. These flanges are specifically designed to cap or seal the ends of piping systems, ensuring a secure and pressure-resistant connection.
What Is an ANSI B16.5 300 lb Flange?
A 300 lb flange—as per ANSI B16.5 standards—is a forged or cast metal ring that connects pipes, valves, pumps, and other equipment in a piping system. Commonly used in industries such as chemical processing, petrochemical plants, and general manufacturing, the 300 class flange is known for handling higher pressure than lower-rated classes like 150 lb.
Key Features of Jizhong 300 lb Flanges:
- Pressure Handling: Class 300 flanges are built to manage greater pressure and temperature levels, depending on the pipe size and flange material.
- Precision Dimensions: Our flanges come in a variety of sizes, with specific bolt patterns and hole diameters tailored to ASME standards.
- Corrosion Resistance: Jizhong carbon steel 300 lb flanges are coated and treated to ensure excellent corrosion protection, making them suitable for harsh industrial environments.
- Packaging Assurance: All Jizhong flanges are packed in wooden crates with protective wrapping to ensure damage-free delivery.
Types and Applications
Jizhong manufactures various types of class 300 flanges, including:
Dimensions Standard of 300# Carbon Steel Flange
Normal pipe size | Outside dia. of flange | Minimum thickness of flange | Overall Length | Bolt Circle | No. and Size of Holes | O.D. of raised face | |||
Welding neck | Slip-on & socket welding | Lap Joint | |||||||
O | Q | Y | Diam. | No. | dia. | R | |||
1/2 | 95 | 14.3 | 52.4 | 22.2 | 22.2 | 666.5 | 4 | 15 | 35 |
3/4 | 117 | 15.9 | 57.2 | 25.4 | 25.4 | 82.4 | 4 | 19 | 43 |
1 | 124 | 17.5 | 61.9 | 27.0 | 27.0 | 89.0 | 4 | 19 | 51 |
1-1/4 | 133 | 19.1 | 65.1 | 27.0 | 27.0 | 98.5 | 4 | 19 | 64 |
1-1/2 | 156 | 20.7 | 68.3 | 30.2 | 30.2 | 114.5 | 4 | 22 | 73 |
2 | 165 | 22.3 | 69.8 | 33.3 | 33.3 | 127.0 | 8 | 19 | 92 |
2-1/2 | 190 | 25.4 | 76.2 | 38.1 | 38.1 | 149.0 | 8 | 22 | 105 |
3 | 210 | 28.6 | 79.4 | 42.9 | 42.9 | 168.0 | 8 | 22 | 127 |
4 | 254 | 318 | 85.7 | 47.6 | 47.6 | 200.0 | 8 | 22 | 157 |
5 | 279 | 35.0 | 98.4 | 50.8 | 50.8 | 235.0 | 8 | 22 | 186 |
6 | 313 | 36.6 | 98.4 | 52.4 | 52.4 | 270.0 | 12 | 22 | 216 |
6 | 381 | 413 | 111.1 | 61.9 | 91.9 | 330.0 | 12 | 25 | 270 |
10 | 444 | 47.7 | 117.5 | 66.7 | 95.3 | 387.5 | 16 | 29 | 324 |
12 | 521 | 50.8 | 130.2 | 73.0 | 101.6 | 451.0 | 16 | 32 | 381 |
14 | 584 | 54.0 | 142.9 | 76.2 | 111.1 | 514.5 | 20 | 32 | 413 |
16 | 648 | 57.2 | 146.0 | 82.6 | 120.7 | 571.5 | 20 | 35 | 470 |
18 | 711 | 60.4 | 158.8 | 88.9 | 130.2 | 628.5 | 24 | 35 | 533 |
20 | 775 | 63.5 | 161.9 | 95.2 | 139.7 | 686.0 | 24 | 35 | 584 |
24 | 914 | 69.9 | 168.3 | 106.4 | 152.4 | 843.0 | 24 | 41 | 692 |
Specification chart of ANSI 300# Flange
Size Chart | 1/2″ (15 NB) to 48″ (1200NB) DN10~DN5000 |
Standards | ANSI/ASME B16.5, B16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, GOST Flange, ASME/ANSI B16.5/16.36/16.47A/16.47B, MSS S44, ISO70051, JISB2220, BS1560-3.1, API7S-15, API7S-43, API605, EN1092 |
UNI | 6Bar 10Bar 16Bar 25Bar 40Bar |
EN | 6Bar 10Bar 16Bar 25Bar 40Bar |
Pressure Rating ANSI | Class 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS |
Pressure Calculation in DIN | 6Bar 10Bar 16Bar 25Bar 40Bar / PN6 PN10 PN16 PN25 PN40, PN64 |
JIS | 5K, 10 K, 16 K 20 K, 30 K, 40 K, 63 K |
Test Certificates | EN 10204/3.1B Raw Materials Certificate 100% Radiography Test Report Third Party Inspection Report, etc |
Coating | Oil Black Paint, Anti-rust Paint, Zinc Plated, Yellow Transparent, Cold and Hot Dip Galvanized |
Most common types | forged / Threaded / Screwed / Plate |
Production technique | forged, Heat treated and machined |
Connect Type/ Flange Face Type | Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF), Large Male-Female (LMF), Lap-Joint Face (LJF), Small Male-Female (SMF), Small Tongue, Large Tongue & Groove, , Groove |
Special design | As per your drawing AS, ANSI, BS, DIN and JIS 15 NB (1/2″) to 200 NB (8″) Equal and Reducing Configurations |
Origin | Indian / West Europe / Japan / USA / Korean |
Manufacturer of | ANSI DIN, GOST, JIS, UNI, BS, AS2129, AWWA, EN, SABS, NFE etc. : -BS Flange, EN Flange, API 6A Flange, ANSI Flange, ASME Flange, DIN Flange, EN1092-1 Flange, UNI Flange, JIS/ KS Flange, BS4504 Flange, GB Flange, AWWA C207 Flange, GOST Flange, PSI Flange B.S: BS4504 , BS3293, BS1560, BS10 AS 2129: Table D; Table E; Table H ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings ANSI : ANSI B16.5, ANSI B16.47(API605), MSS SP44, ANSI B16.36, ANSI B16.48 ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48 American standard (ANSI) German (DIN) British standard (BS) DIN: DIN 2527, DIN 2566, DIN 2573, DIN 2576, DIN 2641, DIN 2642, DIN 2655, DIN 2656, DIN 2627, DIN 2628, DIN 2629, DIN 2631, DIN 2632, DIN 2633, DIN 2634, DIN 2635, DIN 2636, DIN 2637, DIN 2638 The other standard: AWWA C207; EN1092-1, GOST12820, JIS B2220; KS B1503, SABS1123; NFE29203; UNI2276 |
Test | Direct-reading Spectrograph, Hydrostatic testing machine, X-ray detector, UI trasonic flaw detector, Magnetic particle detector |
Equipment | Press machine, Bending machine, Pushing Machine, electric bevelling machine, Sand-blasting machine etc |
Bolt size chart 300# flange
# Bolts or Studs | 300 LB. Flanges | |
Dia of Bolts or Studs | Length of Stud | |
1/16 RF | ||
4 | 0.50 | 2-1/2 |
4 | 0.63 | 3 |
4 | 0.63 | 3 |
4 | 0.63 | 3-1/4 |
4 | 0.75 | 3-1/2 |
8 | 0.63 | 3-1/2 |
8 | 0.75 | 4 |
8 | 0.75 | 4-1/4 |
8 | 0.75 | 4-1/4 |
8 | 0.75 | 4-1/2 |
8 | 0.75 | 4-3/4 |
12 | 0.75 | 4-3/4 |
12 | 0.88 | 5-1/2 |
16 | 1.00 | 6-1/4 |
16 | 1.13 | 6-3/4 |
20 | 1.13 | 7 |
20 | 1.25 | 7-1/2 |
24 | 1.25 | 7-3/4 |
24 | 1.25 | 8 |
24 | 1.50 | 9 |
Class 300 Stainless steel flange pressure rating
| Temperature (in F°) | 300# |
|---|---|
| 100 | 740 |
| 200 | 680 |
| 300 | 655 |
| 400 | 635 |
| 500 | 605 |
| 600 | 570 |
| 650 | 550 |
| 700 | 530 |
| 750 | 505 |
| 800 | 410 |
| 850 | 320 |
| 900 | 230 |
| 950 | 135 |
| 1000 | 85 |
| Hydrostatic Test Pressure (psig) | 1125 |
These are produced with strict adherence to dimensional tolerances and performance specifications, ensuring reliable performance in demanding applications.
Why Choose Jizhong?
As an ISO-certified manufacturer, Jizhong guarantees top-tier product quality, on-time delivery, and excellent customer support. Our 300 lb carbon steel flanges are widely used in global B2B markets due to their durability and compliance with international standards.
