ASME B16.48 Spectacle Blind Flange (RTJ / RF)

spectacle-blind-flange

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The ASME B16.48 spectacle blind flange is a unique flange designed to resemble a pair of spectacles and is used for opening and closing pipelines. Kaizen Steel Industries is a top manufacturer and supplier of Spacer & Blind flanges following the ASME B16.48 standard, available in various sizes. This standard includes flanges from ½ inch to 24 inches, with pressure classes ranging from 150 to 2500. 

The ANSI B16.48 Spectacle Flange consists of a plate and a ring joint positioned parallel to each other. The plate can completely shut off the pipe, while the ring remains on the outer diameter, allowing fluids to flow freely. Spectacle Blind Flange is commonly used in systems that require frequent opening and closing of pipelines.

The Piping Spectacle Blind Flange is designed so that only one side is permanently connected to the pipes. It can rotate around this fixed point to position either the plate or ring over the pipe’s diameter. There are various types, including the Spectacle Blind Flange with a Raised Face, which provides a larger surface area for connection. Pressure ratings differ as well, with the PN16 Spectacle Blind Flange having a lower pressure capacity, and PN ratings ranging from PN6 to PN64. Because of its shape resembling the number 8, this flange is also known as the Spectacle Blind Flange Figure 8.

These flanges can be produced through forging, threading, or screwing and can come as flat face or raised face designs. They are available in different material grades, with the Spectacle Blind Flange Flat Face often made from 304 austenitic stainless steel due to its strength and affordability, though other materials are also used. The Spectacle Blind Flange Class 150 has one of the lowest pressure ratings. 

For more details on variations like the PN10 Blind Spectacle Flange and pricing, please feel free to contact us.

Spectacle Blind Flange Specifications

SpecificationsASME B16.48 Spectacle Blind Flange
StandardsASME | BS | DIN | ANSI | GOST | EN Flange
Size RangesFrom 1/2 inch (i.e. 15 NB) upto 48 inch (i.e. 1200NB)
UNI/ DIN / EN Standard6Bar, 10 Bar, 16Bar, 25 Bar, 40Bar
Production ProcessHeat Treated, Forged, Machined
Flanges Face TypeFF, RF, LMF, SMF, RTJ, LJF.
JIS Standards5 K, 10K, 16K, 20 K, 30K, 40K, 63 K
Pressure ClassesCl 150, Class 300, Cl. 400, 600, Class 900, Cl 1500 and 2500

Spectacle Blind Flange Material Grades

Stainless Steel Spectacle Blind FlangeASTM/ASME A/SA182:- F304, F304L, F316, F316L, ASTM/ASME A/SA351:- CF3, CF3M, CF8, CF8M, DIN 1.4306, DIN 1.4301, DIN 1.4404, DIN 1.4401, DIN 1.4408, DIN 1.4308, DIN 1.4306, DIN 1.4409
Duplex Spectacle Blind FlangeS31803 / S32205 A182:- Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Super Duplex Spectacle Blind FlangeS32750 / S32760 A182:- Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Copper Nickel Spectacle Blind FlangeASTM / ASME SB 61 / 62 / 151 / 152, Copper Nickel 90/10 (C70600 ), Cupro Nickel 70/30 (C71500), UNS C71640
Titanium Spectacle Blind FlangeASTM B381 / ASME SB381:- Titanium Gr. 1, Titanium Gr. 2, Titanium Gr. 4, Titanium Gr. 5, Titanium Gr. 7
ASTM  R50250/GR.1 | R50400/GR.2 | R50550/GR.3 | R50700/GR.4 | GR.6 |R52400/GR.7 | R53400/GR.12 | R56320/GR.9 | R56400/GR.5
Copper Spectacle Blind FlangeTP1, TP2, C10930, C11000, C11300, C11400, C11500, C11600, C12000, C12200, C12300, T1, T2, C10100, C10200, C10300, C10400, C10500, C10700, C10800, C10910, C10920, 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
Incoloy Spectacle Blind FlangeASTM B564 / ASME SB564:- Incoloy 800, 800H, 800HT (UNS N08800), 825 (UNS N08825), 925
Inconel Spectacle Blind FlangeASTM B564 / ASME SB564:- Inconel 600, 601, 625, 718, 783, 690, x750
Nickel Spectacle Blind FlangeASTM B564 / ASME SB564:- Nickel 200, Nickel 201, Nickel 205, Nickel 205LC
Hastelloy Spectacle Blind FlangeASTM B564 / ASME SB564:- Hastelloy C276 (UNS N10276), C22 (UNS N06022), C4, C2000, B2, B3, X
Monel Spectacle Blind FlangeASTM B564 / ASME SB564:- Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500)
Carbon Steel Spectacle Blind FlangeASTM/ASME A/SA105 A/SA105N and A/SA216-WCB, DIN 1.0460, DIN 1.0402, DIN 1.0619, Die Steel, ASTM A105 / ASME SA105, A105N, ASTM A350 LF2 / ASME SA350, CS High Yield ASTM A694 / A694 (F52, F56, F60, F65, F70, F80)
Alloy Steel Spectacle Blind FlangeASTM A182 / ASME SA182:- F5, F9, F11, F12, F22, F91
Alloy 20 Spectacle Blind FlangeASTM B462 / ASME SB462:- Carpenter® 20 Alloy, Alloy 20Cb-3
254 SMO Spectacle Blind FlangeASTM A182 / ASME SA182:- SMO 254/6Mo, UNS S31254, DIN 1.4547
Aluminium Spectacle Blind Flange5052 /6061/ 6063 / 2017 / 7075 / etc.
Brass Spectacle Blind Flange3602 / 2604 / H59 / H62 / etc.
Other Spectacle Blind Flange materialTin bronze, Alumunum bronze, Lead bronze, Nimonic 75, Nimonic 80A, Nimonic 90, AISI 4140, AISI 4130, Mild Steel, Al6XN Flanges

Spectacle Blind Flange Standards

ANSI/ASME B16.47 FlangesANSI/ASME B16.36 FlangesANSI/ASME B16.5 FlangesPr. EN1902-1 Flanges
DIN FlangesJIS FlangesBS 4504 FlangesBS 10 Flanges
MSS SP-44 FlangesJIS B2220 FlangesKS B1503 FlangesUNI Flanges
SABS/SANS 1123 FlangesAS 2129, AS 4087 FlangesISO 9624, ISO 7005-1 FlangesAWWA Flanges Standard
GOST Standard FlangesAPI FlangesAS/ANZ 4331.1 FlangesSeries A Flange
Series B FlangeSAE J518 FlangesGB FlangeNorwegian Standard Flanges

Spectacle Blind Flange Class 150 Dimensions

NPSOutside Ø
A
Inside Ø
B
Center Line
C
THK
t
Web Width
W
1/25116656.438
3/46421806.438
17027906.438
79421006.438
92481156.438
2108611259.751
127731509.751
3146891709.764
16210218512.764
417811420012.764
521314123515.776
624816827015.776
830521933022.476
1035927338525.4102
1241932445028.4102
1448335651531.8108
1653640657038.1108
1859445763041.1114
2065150868544.5121
2477261081050.8140

Spectacle Blind Flange Class 300 Dimensions

NPSOutside Ø
A
Inside Ø
B
Center Line
C
THK
t
Web Width
W
1/25116656.438
3/46421806.438
17027906.438
79421006.438
92481156.438
2108611259.751
127731509.751
3146891709.764
16210218512.764
417811420012.764
521314123515.776
624816827015.776
830521933022.476
1035927338525.4102
1241932445028.4102
1448335651531.8108
1653640657038.1108
1859445763041.1114
2065150868544.5121
2477261081050.8140

Spectacle Blind Flange Class 600 Dimensions

NPSOutside Ø
A
Inside Ø
B
Center Line
C
THK
t
Web Width
W
1/25116656.438
3/46421806.438
17027906.457
79371009.757
92431159.767
2108551259.757
1276715012.767
31468317012.767
1599618515.776
419110821515.776
523813526519.186
626416229022.486
831821235028.495
1039726543035.1105
1245431549041.1105
1448934652544.5114
1656239760550.8124
1861044865553.8133
2067949772563.5133
2478759784073.2152

Spectacle Blind Flange Class 900 Dimensions

NPSOutside Ø
A
Inside Ø
B
Center Line
C
THK
t
Web Width
W
1/26016806.438
3/46721906.441
176271006.457
86371109.757
95431259.767
21405516512.757
1626719012.767
31658319015.767
420310823519.176
524413528022.486
628616232025.486
835621239535.195
1043226547041.1105
1249531553547.8105
1451834656053.8114
1657239761560.5124
1863544868566.5133
2069649775073.2133
2483559790088.9152

Spectacle Blind Flange Class 1500 Dimensions

NPSOutside Ø
A
Inside Ø
B
Center Line
C
THK
t
Web Width
W
1/26116806.438
3/46721909.741
176271009.764
86351109.764
954112512.770
21405316512.770
1626319015.776
31727820519.176
420610224022.489
525112829028.489
627915432035.189
834920339541.1102
1043225548050.8114
1251830357060.5114
1457533363566.5127
1663838170576.2133
1870242977585.9146
2075247883095.3152
24899575990111.3178

Spectacle Blind Flange Class 2500 Dimensions

NPSOutside Ø
A
Inside Ø
B
Center Line
C
THK
t
Web Width
W
1/26716909.738
3/47321959.741
183271109.764
1023513012.764
1144114515.770
21435317015.770
1656319519.176
31947823022.476
423210227528.489
527612832535.189
631415437041.189
838419844053.8102
1047324854066.5114
1254628962079.2114

Spectacle Blind Flange Industries and Applications

  •     Pumps, valves, and vessels used in manufacturing and food processing.
  •     Pipe connections in industrial waterworks.
  •     Heat exchangers and heating systems of various sizes.
  •     Support structures in mining operations.
  •     Nuclear power systems.
  •     Plumbing and mechanical systems.
  •     Assemblies in the oil, gas, and petrochemical industries.
  •     Fire protection systems.

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