Blind flange dimensions are covered in ASME B16.5 – which covers Pipe Flanges and Flanged Fittings for size NPS ½” to 24” for above NPS 26” to 60” it should be as per ASME B16.47.

During dimensional inspection of flange, you should check for following;

  • Outer Diameter of body
  • Bolt Circle & Bolt hole Diameter
  • Straightness and alignment of the bolt hole
  • Thickness of the Blind
blind flange dimensions

Class 150 Blind Flange Dimensions

Size
in Inch
Size
in mm
Outer
Dia.
Flange
Thick.
RF
Dia.
RF
Height
PCDNo of
Bolts
Bolt Size
UNC
Machine Bolt
Length
RF Stud
Length
Hole SizeISO Stud
Size
Weight
in kg
ABCDE
1/215909.634.9260.341/250555/8M140.9
3/42010011.242.9269.941/250655/8M140.9
12511012.750.8279.441/255655/8M140.9
1 1/43211514.363.5288.941/255705/8M141.4
1 1/24012515.973298.441/265705/8M141.8
25015017.592.12120.745/870853/4M162.3
2 1/26518020.7104.82139.745/875903/4M163.2
38019022.31272152.445/875903/4M164.1
3 1/29021522.3139.72177.885/875903/4M165.9
410023022.3157.22190.585/875903/4M167.7
512525522.3185.72215.983/485957/8M209.1
615028023.9215.92241.383/4851007/8M2011.8
820034527269.92298.583/4901107/8M2020.5
1025040528.6323.82362127/81001151M2432
1230048530.23812431.8127/81001201M2450
1435053533.4412.82476.31211151351 1/8M2764
1640059535469.92539.81611151351 1/8M2782
1845063538.1533.42577.9161 1/81251451 1/4M30100
2050070041.3584.22635201 1/81401601 1/4M30130
2460081546.1692.22749.3201 1/41501701 3/8M33196

Class 300 Blind Flange Dimensions

Size
in Inch
Size
in mm
Outer
Dia.
Flange
Thick.
RF
Dia.
RF
Height
PCDNo of
Bolts
Bolt Size
UNC
Machine Bolt
Length
RF Stud
Length
Hole
Size
ISO Stud
Size
Weight
in kg
ABCDE
1/2159512.734.9266.741/255655/8M141.4
3/42011514.342.9282.645/865753/4M161.4
12512515.950.8288.945/865753/4M161.4
1 1/43213517.563.5298.445/870853/4M161.8
1 1/24015519.1732114.343/475907/8M202.7
25016520.792.1212785/875903/4M163.7
2 1/26519023.9104.82149.283/4851007/8M205.5
380210271272168.383/4901107/8M207.3
3 1/29023028.6139.72184.283/4951107/8M209.6
410025530.2157.2220083/4951157/8M2012.3
512528033.4185.7223583/41101207/8M2015.9
615032035215.92269.9123/41101207/8M2022.7
820038039.7269.92330.2127/81201401M2436
1025044546.1323.82387.41611401601 1/8M2757
1230052049.33812450.8161 1/81451701 1/4M3084
1435058552.4412.82514.4201 1/81601801 1/4M30113
1640065055.6469.92571.5201 1/41651901 3/8M33134
1845071058.8533.42628.6241 1/41701951 3/8M33181
2050077562584.22685.8241 1/41852051 3/8M33230
2460091568.3692.22812.8241 1/22052301 5/8M39359

Class 400 Blind Flange Dimensions

Size
in Inch
Size
in mm
Outer
Dia.
Flange
Thick.
RF
Dia.
RF
Height
PCDNo of
Bolts
Bolt Size
UNC
RF Stud
Length
Hole
Size
ISO Stud
Size
Weight
in kg
ABCDE
1/2159514.334.9766.741/2755/8M141.5
3/42011515.942.9782.645/8903/4M161.5
12512517.550.8788.945/8903/4M161.8
1 1/43213520.763.5798.445/8953/4M162.3
1 1/24015522.3737114.343/41107/8M203.7
25016525.492.1712785/81103/4M164.6
2 1/26519028.6104.87149.283/41207/8M206.8
38021031.81277168.383/41257/8M209.1
3 1/29023035N/A7184.287/81401M2413.2
410025535157.2720087/81401M2415
512528038.1185.7723587/81451M2420
615032041.3215.97269.9127/81501M2428
820038047.7269.973301211701 1/8M2746
1025044554323.87387.4161 1/81901 1/4M3071
1230052057.23817450.8161 1/42051 3/8M33102
1435058560.4412.87514.4201 1/42101 3/8M33132
1640065063.5469.97571.5201 3/82201 1/2M36168
1845071066.7533.47628.6241 3/82301 1/2M36207
2050077569.9584.27685.8241 1/22401 3/4M39266
2460091576.2692.27812.8241 3/42651 7/8M45405
Piping Courses

Class 600 Blind Flange Dimensions

Size in InchSize in mmOuter Dia.Flange Thick.RF Dia.RF HeightPCDNo of BoltsBolt Size UNCRF Stud LengthHole SizeISO Stud SizeWeight in kg
ABCDE
1/2159514.334.9766.741/2755/8M141.4
3/42011515.942.9782.645/8903/4M161.4
12512517.550.8788.945/8903/4M161.8
1 1/43213520.763.5798.445/8953/4M162.3
1 1/24015522.3737114.343/41107/8M203.7
25016525.492.1712785/81103/4M164.6
2 1/26519028.6104.87149.283/41207/8M206.8
38021031.81277168.383/41257/8M209.1
3 1/29023035N/A7184.287/81401M2413.2
410027538.1157.27215.987/81451M2418.7
512533044.5185.77266.7811651 1/8M2731
615035547.7215.97292.11211701 1/8M2739
820042055.6269.97349.2121 1/81901 1/4M3064
1025051063.5323.87431.8161 1/42151 3/8M33105
1230056066.73817489201 1/42201 3/8M33134
1435060569.9412.87527201 3/82351 1/2M36161
1640068576.2469.97603.2201 1/22551 5/8M39225
1845074582.6533.47654201 5/82751 3/4M42286
2050081588.9584.27723.9241 5/82851 3/4M42368
24600940101.6692.27838.2241 7/83302M48568

Class 900 Blind Flange Dimensions

Size in InchSize in mmOuter Dia.Flange Thick.RF Dia.RF HeightPCDNo of BoltsBolt Size UNCRF Stud LengthHole SizeISO Stud SizeWeight in kg
ABCDE
1/21512022.334.9782.643/41107/8M201.8
3/42013025.442.9788.943/41157/8M202.7
12515028.650.87101.647/81251M243.6
1 1/43216028.663.57111.147/81251M244.1
1 1/24018031.8737123.8411401 1/8M275.9
25021538.192.17165.187/81451M2410.1
2 1/26524541.3104.87190.5811601 1/8M2716
38024038.11277190.587/81451M2413
410029044.5157.2723581 1/81701 1/4M3024.5
512535050.8185.77279.481 1/41901 3/8M3339.5
615038055.6215.97317.5121 1/81901 1/4M3053
820047063.5269.97393.7121 3/82201 1/2M3691
1025054569.9323.87469.9161 3/82351 1/2M36132
1230061079.43817533.4201 3/82551 1/2M36189
1435064085.8412.87558.8201 1/22751 5/8M39237
1640070588.9469.97616201 5/82851 3/4M42273
18450785101.6533.47685.8201 7/83252M48367
20500855108584.27749.32023502 1/8M52463
246001040139.7692.27901.7202 1/24402 5/8M64875

Class 1500 Blind Flange Dimensions

Size in InchSize in mmOuter Dia.Flange Thick.RF Dia.RF HeightPCDNo of BoltsBolt Size UNCRF Stud LengthHole SizeISO Stud SizeWeight in kg
ABCDE
1/21512022.334.9782.643/41107/8M201.8
3/42013025.442.9788.943/41157/8M202.7
12515028.650.87101.647/81251M243.7
1 1/43216028.663.57111.147/81251M244.1
1 1/24018031.8737123.8411401 1/8M275.9
25021538.192.17165.187/81451M2410.1
2 1/26524541.3104.87190.5811601 1/8M2715.9
38026547.71277203.281 1/81801 1/4M3021.8
410031054157.27241.381 1/41951 3/8M3333
512537573.1185.77292.181 1/22501 5/8M3964
615039582.6215.97317.5121 3/82601 1/2M3675
820048592.1269.97393.7121 5/82901 3/4M42136
10250585108323.87482.6121 7/83352M48232
12300675123.93817571.51623752 1/8M52314
14350750133.4412.87635162 1/44052 3/8M56443
16400825146.1469.97704.8162 1/24452 5/8M64591
18450915162533.47774.7162 3/44952 7/8M72795
20500985177.8584.27831.81635403 1/8M761022
246001170203.2692.27990.6163 1/26153 5/8M901648

Class 2500 Blind Flange Dimensions

Size in InchSize in mmOuter Dia.Flange Thick.RF Dia.RF HeightPCDNo of BoltsBolt Size UNCRF Stud LengthHole SizeISO Stud SizeWeight in kg
ABCDE
1/21513530.234.9788.943/41207/8M203.2
3/42014031.842.9795.243/41257/8M203.7
1251603550.8710847/81401M245
1 1/43218538.163.57130.2411501 1/8M277.8
1 1/24020544.573714641 1/81701 1/4M3010.5
25023550.992.17171.4811801 1/8M2718
2 1/26526557.2104.87196.881 1/81951 1/4M3025.5
38030566.71277228.681 1/42201 3/8M3339
410035576.2157.2727381 1/22551 5/8M3961.5
512542092.1185.77323.881 3/43001 7/8M45102
6150485108215.97368.3823452 1/8M52157
8200550127269.97438.21223802 1/8M52241
10250675165.1323.87539.8122 1/24902 5/8M64470
12300760184.23817619.1122 3/45402 7/8M72575

Disclaimer –  Please check with ASME B16.5 Before using.

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