Blind Flanges

Blind Flanges

Blind Flanges (ASME B16.5) Manufacturers, Exporters & Suppliers in India.

The following given are various Bind Flanges types:

446 Blind Flanges, 347/347H Blind Flanges (BLRF), 321/321H Blind Flanges (BLRF), 317/317L Blind Flanges (BLRF), 316/316L Blind Flanges (BLRF), 310/310S Blind Flanges (BLRF), 304/304L Blind Flanges (BLRF).

Stainless Steel, Alloy 20, Hastelloy, Carbon Steel, Duplex steel, Alloy Steel, Titanium, Copper Nickel Alloy, Monel & Inconel Blind Flanges.

Blind Flange is a Flange without bore and is widely used to close down the piping systems or vessel openings. It also helps in providing easy access to vessels and piping systems for inspection purposes. Blind flange can be supplied with as well as without hubs depending on the client's demand.

Material of ConstructionStandard Grades
Stainless Steel Blind Flanges ASTM A240, A182
201, 202, F 304, 304L, 304H, 309S, 309H, 310S, 310H, 316, 316Ti, 316H, 316L, 316LN, 317, 317L, 321, 321H, 347, 347H,  904L
Carbon Steel Blind Flanges ASTM A105 Gr. F70,65,60,56,52,46,42
Alloy Steel
Blind Flanges
ASTM A182 F91,F22,F11,F9,F5,F1
Nickel Alloy
Blind Flanges
ASTM SB160, SB162, SB472, SB564
Nickel 200 (UNS No. N02200), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Hastelloy C 276 (UNS No. N10276), Alloy 20 (UNS No. N08020), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601)
Copper Alloys Blind Flanges ASTM SB151, SB152, SB 61, SB62 
UNS No. C 71500 (Cu-Ni 70/30), C 70600 (Cu-Ni 90/10), UNS No. C 12200, 12000, 10800, 10300, 10100    
Low Temperature Carbon Steel Blind Flanges ASTM A350 LF3, LF2
Duplex Steel Blind Flanges ASTM A240, A182
UNS F 61, F 60, F 55, F 53, F51, F 45, F 44      



Dimensional Tolerances of Blind Flanges ASME B16.5

Outside Diameter
≤ 24 = 1.6 mm | > 24 = ± 3.2 mm
Inside Diameter
not applicable
Diameter of Contact Face
1.6 mm Raised Face = ± 0.8 mm
6.35 mm Raised Face, Tongue & Groove / Male-Female = ± 0.4 mm
Outside Diameter of Hub
≤ 12 = + 2.4 mm / - 1.6 mm | ≥ 14 = ± 3.2 mm
Diameter of Counterbore
not applicable
Drilling
Bolt Circle = 1.6 mm | Bolt Hole Spacing = ± 0.8 mm
Eccentricity of Bolt Circle with Respect to Facing
≤ 2½ = 0.8 mm max. | ≥ 3 = 1.6 mm max.
Thickness
≤ 18 = + 3.2 mm / - 0 | ≥ 20 = + 4.8 mm / - 0
Length thru Hub
≤ 18 = + 3.2 mm / - 0.8 mm | ≥ 20 = + 4.8 mm / - 1.6 mm