API Flanges Dimensions

The American Petroleum Institute or as shortened as API has developed specification api 15k flanges 6A, which is further categorised into two product specification levels i.e PSL 1 and PSL 2. While PSL 1 is a standard for quality, the api 6a flanges produced under PSL 2 has a very stringent testing method and adherence policy.  For instance the api 10000 psi flanges PSL 2 needs to conform to the following parameters i.e. qualification, temperature, design, specification,  process, hydrostatic test, and also inspection.

Check API 6A Flanges Standards and Weight

API Flanges

API Flanges

API Flanges Dimensions

API Flanges Dimensions

API Flanges Standards

API Flanges Standards

Manufacturer of Stainless Steel API 6A Flanges, Supplier of Carbon Steel API 6A Flanges at lowest price

Moreover, PSL 2 flanges demanded traceability until all the examinations have been cleared by the specification. Industries that use the  API Flanges Dimensions include petroleum, petrochemical along with the natural gas industry as well as the drilling and manufacture equipment for offshore piping systems. Generally, the api 6a flanges material used to produce them include carbon steel, alloy steel, stainless steel, duplex and super duplex stainless steel grades as well as Inconel and Hastelloy.

Specifications Chart of API Flanges

API Flanges Size Chart 1/2″ (15 NB) to 48″ (1200NB) DN10~DN5000
API Flanges 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
API Flanges Pressure Rating ANSI Class 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS
API Flanges 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 of API Flanges 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.
API Flanges: -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 API Flanges
  • 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

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Available Material of API Flanges

Carbon Steel
  • ASTM A105
  • ASME SA105
  • DIN 1.0402
  • DIN 1.0460
  • DIN 1.0619
  • ASTM A105N
  • ASME SA105N
  • ASTM A350 LF2
  • ASME SA350
  • High Yield CS ASTM A694
Stainless Steel
  • ASTM A182 F304
  • ASTM A182 F304L
  • ASTM A182 F316
  • ASTM A182 F316L
  • ASTM A182 F317
  • ASTM A182 F317L
  • ASTM A182 F321
  • ASTM A182 F321H
  • ASTM A182 F347
  • ASTM A182 F347H
Alloy Steel
  • ASTM A182 F5
  • ASTM A182 F9
  • ASTM A182 F11
  • ASTM A182 F22
  • ASTM A182 F91
Inconel
  • Inconel 600
  • Inconel 601
  • Inconel 625
  • Inconel 718
  • Inconel x750
Copper T1, T2, C10100, C10200, C10300, C10400, C10500, C10700, C10800, C10910,C10920, TP1, TP2, C10930, C11000, C11300, C11400, C11500, C11600, C12000,C12200, C12300, TU1, TU2, C12500, C14200, C14420, C14500, C14510, C14520, C14530, C17200, C19200,
C21000, C23000, C26000, C27000, C27400, C28000, C33000, C33200, C37000, C44300, C44400, C44500, C60800, C63020, C68700, C70400, C70600, C70620, C71000, C71500, C71520, C71640, etc
Copper Nickel Copper Nickel 90/10 (C70600 ), Cupro Nickel 70/30 (C71500), UNS C71640
Brass 3602 / 2604 / H59 / H62 / etc.
Hastelloy Hastelloy C276 (UNS N10276), C22 (UNS N06022), C4, C2000, B2, B3, X
Monel Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500)
Alloy 20 Carpenter® 20 Alloy, Alloy 20Cb-3
Aluminium 5052 /6061/ 6063 / 2017 / 7075 / etc.
Nickel Nickel 200, Nickel 201
Duplex S31803 / S32205 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Super Duplex S32750 / S32760 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Incoloy Incoloy 800, Incoloy 800H, Incoloy 800HT (UNS N08800), Incoloy 825 (UNS N08825)
254 Smo SMO 254/6Mo, UNS S31254, DIN 1.4547
Nimonic Nimonic 75, Nimonic 80A, Nimonic 90
Other material Tin bronze, Alumunum bronze, Lead bronze
Titanium
  • ASTM B381 Titanium Gr. 1
  • ASTM B381 Titanium Gr. 2
  • ASTM B381 Titanium Gr. 4
  • ASTM B381 Titanium Gr. 5
  • ASTM B381 Titanium Gr. 7
Stock an extensive range of API Flanges, API 6A Square Flanges manufacturer

Dimensions of API Flanges

Flange Size Working Pressure (PSI) Outside Diameter Number of Bolt Holes Diameter of Bolt Holes Length of Bolts API Ring Gasket
1-13/16″ 10,000 7-3/8″ 8 3/4″ 5-1/4″ BX-151
1-13/16″ 15,000 8-3/16″ 8 7/8″ 6″ BX-151
1-13/16″ 20,000 10-1/8″ 8 1″ 7-3/4″ BX-151
2-1/16″ 2,000 6-1/2″ 8 5/8″ 5/8″ R-23
2-1/16″ 3,000/5,000 8-1/2″ 8 7/8″ 7/8″ R-24
2-1/16″ 10,000 7-7/8″ 8 3/4″ 3/4″ BX-152
2-1/16″ 15,000 8-3/4″ 8 7/8″ 7/8″ BX-152
2-1/16″ 20,000 11-5/16″ 8 1-1/8″ 1-1/8″ BX-152
2-9/16″ 2,000 7-1/2″ 8 3/4″ 5-1/4″ R-26
2-9/16″ 3,000/5,000 9-5/8″ 8 1″ 7″ R-27
2-9/16″ 10,000 9-1/8″ 8 7/8″ 6-1/4″ BX-153
2-9/16″ 15,000 10″ 8 1″ 7″ BX-153
2-9/16″ 20,000 12-13/16″ 8 1-1/4″ 9-1/2″ BX-153
3-1/8″ 2,000 8-1/4″ 8 3/4″ 5-1/2″ R-31
3-1/8″ 3,000 9-1/2″ 8 7/8″ 6-1/4″ R-31
3-1/8″ 5,000 10-1/2″ 8 1-1/8″ 7-3/4″ R-35
3-1/16″ 10,000 10-5/8″ 8 1″ 7-1/4″ BX-154
3-1/16″ 15,000 11-5/16″ 8 1-1/8″ 8″ BX-154
3-1/16″ 20,000 14-1/16″ 8 1-3/8″ 10-3/4″ BX-154
4-1/16″ 2,000 10-3/4″ 8 7/8″ 6-1/4″ R-37
4-1/16″ 3,000 11-1/2″ 8 1-1/8″ 7-1/2″ R-37
4-1/16″ 5,000 12-1/4″ 8 1-1/8″ 8-3/8″ BX-155
4-1/16″ 20,000 17-9/16″ 8 1-3/4″ 12-3/4″ BX-155
5-1/8″ 5,000 14-3/4″ 8 1-1/2″ 10-3/4″ R-44
7-1/16″ 2,000 14″ 12 1″ 7-1/2″ R-45
7-1/16″ 3,000 15″ 12 1-1/8″ 8-1/2″ R-45
7-1/16″ 5,000 15-1/2″ 12 1-3/8″ 11-1/4″ R-46
7-1/16″ 10,000 18-7/8″ 12 1-1/2″ 11-3/4″ BX-156
7-1/16″ 15,000 19-7/8″ 16 1-1/2″ 13″ BX-156
7-1/16″ 20,000 24-13/16″ 16 2″ 17-3/4″ BX-156
9″ 2,000 16-1/2″ 12 1-1/8″ 8-1/2″ R-49
9″ 3,000 18-1/2″ 12 1-3/8″ 9-1/2″ R-49
9″ 5,000″ 19″ 12 1-5/8″ 12-1/2″ R-50
9″ 10,000 21-3/4″ 16 1-1/2″ 13-1/4″ BX-157
9″ 15,000 25-1/2″ 16 1-7/8″ 16″ BX-157
11″ 2,000 20″ 16 1-1/4″ 9-1/4″ R-53
11″ 3,000 21-1/2″ 16 1-3/8″ 10″ R-53
11″ 5,000 23″ 12 1-7/8″ 14-1/4″ R-54
11″ 10,000 25-3/4″ 16 1-3/4″ 15-3/8″ BX-158
11″ 15,000 32″ 20 2″ 19-1/2″ BX-158
13-5/8″ 2,000 22″ 20 1-1/4″ 9-1/2″ R-57
13-5/8″ 3,000 24″ 20 1-3/8″ 10-3/4″ R-57
13-5/8″ 5,000 26-1/2″ 16 1-5/8″ 12-3/4″ BX-160
13-5/8″ 10,000 30-1/4″ 20 1-7/8″ 17-3/4″ BX-159
13-5/8″ 15,000 34-7/8″ 20 2-1/4″ 21″ BX-159
16-3/4″ 2,000 27″ 20 1-1/2″ 10-3/4″ R-65
16-3/4″ 3,000 27-3/4″ 20 1-5/8″ 12-1/4″ R-66
16-3/4″ 5,000 30-3/8″ 16 1-78″ 14-3/4″ BX-162
16-3/4″ 10,000 34-5/16″ 24 1-7/8″ 17-3/4″ BX-162
18-3/4″ 5,000 35-5/8″ 20 2″ 18″ BX-163
16-3/4″ 10,000 40-15/16″ 24 2-1/4″ 23″ BX-164
20-3/4″ 3,000 33-3/4″ 20 2″ 15-1/4″ R-74
21-1/4″ 2,000 32″ 24 1-5/8″ 12-1/2″ R-73
21-1/4″ 5,000 39″ 24 2″ 19″ BX-165
21-1/4″ 10,000 45″ 24 2-1/2″ 24-3/4″ BX-166
26-3/4″ 2,000 41″ 20 1-3/4″ 14-1/4″ BX-167
21-1/4″ 3,000 43-3/8″ 24 2″ 17-1/2″ BX-168
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Price List of API Flanges

API Weld Neck Flanges US $0.5-1000 / Piece (FOB Price)
API Threaded Flanges US $300-500 / Ton (FOB Price)
API forged Flanges US $1-900 / Piece (FOB Price)
API Socket Weld Flanges US $0.5-1000 / Piece (FOB Price)
API Blind Flanges US $1-300 / Piece (FOB Price)