Blind Flange,Blind RTJ flange,Blind RF flange,A105 Blind flange RTJ ASME/ANSI B16.5 Class1500

We are a professional manufacturer of ASME/ANSI B16.5 Class1500 Blind Flange,Blind RTJ flange,Blind RF flange,A105 Blind flange RTJ in china

What is a Blind Flanges

A blind flange is a solid steel piece with no bore (interior diameter) and primarily designed to cap off a line. As the majority of flange connections allow for the passing through of air or fluid via an interior opening, blinds give the ends of pipe connections a well formed termination point or rerouting of the media in question towards another portion of the pipe assembly. Opt for a blind flange in these cases, as well as in instances when a pipe line requires a future modification such as the installation of a valve or fitting to reroute flow.

Blind Flanges We Supply

🔹 Blind RF Flange (Raised Face)

• Raised sealing surface

• Used with soft gaskets (spiral wound, graphite, PTFE)

• Most common type in oil & gas and industrial piping

🔹 Blind RTJ Flange (Ring Type Joint)

• Machined groove for metal ring gasket

• Superior sealing under high pressure and high temperature

• Ideal for Class 600, 900, 1500, and 2500 service

🔹 Blind Flat Face (FF) Flange

• Flat sealing surface

• Typically used in low-pressure systems or with cast iron equipment

ASTM A105 Blind Flange – Material Specification

ASTM A105 Blind Flanges are manufactured from forged carbon steel, suitable for ambient and high-temperature service.

• Standard: ASTM A105 / ASME SA105

• Material Type: Carbon Steel Forging

• Impact Test: Not required (for normal temperature service)

• Heat Treatment: Normalized (A105N commonly supplied)

Testing & Inspection

• Chemical composition analysis

• Mechanical testing

• Ultrasonic testing (UT)

• PMI (Positive Material Identification)

• Visual & dimensional inspection

Certification: EN 10204 3.1 / 3.2
Third-party inspection available (SGS, TÜV, BV).

ASTM A105 blind flanges are the most economical and widely used option for general pressure piping.

Our blind flange are available in

CARBON STEEL – CT20, ASTM/ASME SA-105, A-350 LF-2, LF-3, A694, SA-516-70,

CHROME ALLOYS – A-182-F-1, F-5, F-6, F-7, F-9, F-11, F-12, F-22, F-51

STAINLESS STEEL – A-182 – F-304, 304L, 316, 316L, 309, 310, 317L, 321, 347,Alloy 20

ALUMINUM – 1100, 2014, 3003, 5083, 5086, 6061, 7075

HASTALLOY – B-2, C-276, G, X

INCONEL – 600, 601, 625, 718

INCOLLOY – 800, 825

MONEL – 400

ASME/ANSI B16.5 Class1500 Blind Flange Dimensions and Weight

Dimensions and Weight Chart for ASME/ANSI B16.5 Class1500 Blind Flange

Pipe		Flange		Raised  Face	Drilling Template			Approx. Weight
Norm. size	O D in. mm	D in. mm	b in. mm	g in. mm	Number	l in. mm	k in. mm	≈ Pounds Kgs
1/2″	0,84 21,3	4,75 120,6	0,88 22,3	1,38 35,0	4	0,88 22,3	3,25 82,5	3,9 1,77
3/4″	1,05 26,7	5,12 130,0	1,00 25,4	1,69 42,9	4	0,88 22,3	3,50 88,9	5,3 2,42
1″	1,315 33,4	5,88 149,3	1,12 28,4	2,00 50,8	4	1,00 25,4	4,00 101,6	7,9 3,57
1 1/4″	1,66 42,2	6,25 158,7	1,12 28,4	2,50 63,5	4	1,00 25,4	4,38 111,2	9,1 4,14
1 1/2″	1,90 48,3	7,00 177,8	1,25 31,7	2,88 73,1	4	1,12 28,4	4,88 123,9	12,7 5,75
2″	2,375 60,3	8,50 215,9	1,50 38,1	3,62 91,9	8	1,00 25,4	6,50 165,1	22,2 10,1
2 1/2″	2,875 73,0	9,62 244,3	1,62 41,1	4,12 104,6	8	1,12 28,4	7,50 190,5	30,8 14,0
3″	3,50 88,9	10,50 266,7	1,88 47,7	5,00 127,0	8	1,25 31,7	8,00 203,2	42,1 19,1
4″	4,50 114,3	12,25 311,1	2,12 53,8	6,19 157,2	8	1,38 35,0	9,50 241,3	65,9 29,9
5″	5,563 141,3	14,75 374,6	2,88 73,1	7,31 185,6	8	1,62 41,1	11,50 292,1	129 58,4
6″	6,625 168,3	15,50 393,7	3,25 82,5	8,50 215,9	12	1,50 38,1	12,50 317,5	158 71,8
8″	8,625 219,1	19,00 482,6	3,62 91,9	10,62 269,7	12	1,75 44,5	15,50 393,7	269 122
10″	10,75 273	23,00 584,2	4,25 107,9	12,75 323,9	12	2,00 50,8	19,00 482,6	463 210
12″	12,75 323,8	26,50 673,1	4,88 123,9	15,00 381,0	16	2,12 53,8	22,50 571,5	696 316
14″	14,0 355,6	29,50 749,3	5,25 133,3	16,25 412,7	16	2,38 60,4	25,00 635,0	925 420
16″	16,0 406,4	32,50 825,5	5,75 146,0	18,50 469,9	16	2,62 66,5	27,75 704,8	1229 558
18″	18,0 457,2	36,00 914,4	6,38 162,0	21,00 533,4	16	2,88 73,1	30,50 774,7	1674 760
20″	20,0 508	38,75 984,2	7,00 177,8	23,00 584,2	16	3,12 79,2	32,75 831,8	2126 965
24″	24,0 609,6	46,00 1168,4	8,00 203,2	27,25 692,1	16	3,62 91,9	39,00 990,6	3432 1558