ANSI ASME B16.5 ASTM a 182-F 316L Stainless Steel Blind Flange

Product Description

ANSI B16.5 FORGING FLANGE -- BLIND FLANGE
The blind flange is a specialized flange used to seal the ends of piping systems, preventing the flow of fluids and gases. Unlike flanges with a central bore, blind flanges are solid disks that create a secure closure, making them ideal for isolating sections of a system for maintenance or inspection.
Commonly found in industries such as oil and gas, chemical processing, water treatment, and power generation, blind flanges can withstand high pressures and temperatures, ensuring system integrity. They are available in various materials, including carbon steel, stainless steel, and alloy steel, each chosen based on the application's environmental conditions.
Manufactured to meet industry standards like ANSI, ASME, and DIN, blind flanges ensure compatibility and safety. They can also be customized in size and pressure rating to fit specific project requirements. Overall, blind flanges are vital for maintaining the reliability and safety of piping systems.

Slip-On Flange (SO)	Weld Neck Flange (WN)	Socket Weld Flange (SW)
Threaded Flange (TH)	Lap Joint Flange (LJ)	Blind Flange (BL)

Nominal Pipe Size	Outside Diam.	Diam. at Base of Hub	0,D,of Raised Face	Thickness	BORE					LENGTH THRU HUB			Diam.of Hub at Bevel	Radius of Filet	Thread Length
					Welding Neck Socket Welding		Slip-on Socket Welding	Lap Joint	Counter Bore Min	Welding Neck	Slip-on Threaded Socket Welding	Lap Joint
	D	X	G	t	B1		B2	B3	B	T1	T2	T3	A	R	Q
1/2	95	38.1	35.1	14.2	See Note(1) To be specified by purchaser		22.4	22.9	23.6	52.3	22.4	22.4	21.3	3.0	15.7
3/4	117	47.8	42.9	15.7			27.7	28.2	29.0	57.2	25.4	25.4	26.7	3.0	15.7
1	124	53.8	50.8	17.5			34.5	35.1	35.8	62.0	26.9	26.9	33.5	3.0	17.5
1 1/4	133	63.5	63.5	20.6			43.2	43.7	44.5	66.5	28.4	28.4	42.2	4.8	20.6
1 1/2	155	69.9	73.2	22.4			49.5	50.0	50.5	69.9	31.8	31.8	48.3	6.4	22.4
2	165	84.1	91.9	25.4			62.0	62.5	63.5	73.2	36.6	36.6	60.5	7.9	28.4
2 1/2	191	100.1	104.6	28.4			74.7	75.4	76.2	79.2	41.1	41.1	73.2	7.9	31.8
3	210	117.3	127.0	31.8			90.7	91.4	92.2	82.6	46.0	46.0	88.9	9.7	35.1
3 1/2	229	133.4	139.7	35.1			103.4	104.1	104.9	85.9	49.3	49.3	101.6	9.7	39.6
4	273	152.4	157.2	38.1			116.1	116.8	117.6	101.6	53.8	53.8	114.3	11.2	41.1
5	330	189.0	185.7	44.5			143.8	144.5	144.5	114.3	60.5	60.5	141.2	11.2	47.8
6	356	222.3	215.9	47.8			170.7	171.6	171.5	117.3	66.5	66.5	168.4	12.7	50.8
8	419	273.1	269.7	55.6			221.5	222.3	222.3	133.4	76.2	76.2	219.2	12.7	57.2
10	508	342.9	323.9	63.5			276.4	277.4	276.4	152.4	85.9	111.3	273.1	12.7	65.0
12	559	400.1	381.0	66.5			327.2	328.2	328.7	155.4	91.9	117.3	323.9	12.7	69.9
14	603	431.8	412.8	69.9			359.2	360.2	360.4	165.1	93.7	127.0	355.6	12.7	73.2
16	686	495.3	469.9	76.2			410.5	411.2	411.2	177.8	106.4	139.7	406.4	12.7	77.7
18	743	546.1	533.4	82.6			461.8	462.3	462.0	184.2	117.3	152.4	457.2	12.7	79.2
20	813	609.6	584.2	88.9			513.1	514.4	512.8	190.5	127.0	165.1	508.0	12.7	82.6
24	940	717.6	692.2	101.6			616.0	616.0	614.4	203.2	139.7	184.2	609.6	12.7	91.9

Notes:
(1) For the inside diameter of pipes (corresponding to 'Bore' (B1) of Welding Neck Flanges), refer to page 60.
(2) Class 600 flanges except Lap Joint will be furnished with 0.25" (6,35mm) raised face, which is not included in thickness'(t) and Length through Hub'(Ti),(T2).
(3) For Slip-on, Threaded, and Lap Joint and Socket Welding Flanges, the hubs can be shaped either vertically from base to top or tapered within the limits of 7 degrees.
(4) Blind Flanges may be made with the same hub as that used for Sllp-on Flanges or without a hub.
(5) The gasket surface and backside (bearing surface for bolting) are made parallel within 1 degree. To accomplish parcels, spot facing is scared out according to MSS SP-9, without reducing thickness(t).
(6) Dimensions of sizes 1/2" through 3 1/2" are the same as for Class 400 Flanges.
(7) Depth of Socket (Y) is covered by ANSI B16.5 only in sizes through 3 inch, over 3 inch is at the manufacturer's optlon.

ANSI B16.5 FORGED FLANGES TOLERANCE

THREAD,SOCKET-WELDING, SLIP-ON,LAP JOINT AND BLIND.			WELDING NECK
Outside Diameter	When O.D.is 24"or less	±1/16"(1.6mm)	Outside Diameter	When O.D.is 24"or less	±1/16"(1.6mm)*
	When O.D.is Over 24"	±1/8"(3.2mm)*		When O.D.is Over 24"	±18"(3.2mm)
Inside Diameter	Threaded	Within limits on boring gauge	Inside Diameter	10"and Smaller	±1/32"(0.8mm)
				20"thru 18"	±1/16"(1.6mm)
	Socket-Welding Slip-on and Lap joint	10"&Smaller +1/32"(0.8mm).0" 12"&Larger +1/16"(1.6mm).O"		20"and Larger	+1/8"(3.2mm) -1/16"(1.6mm)
Outside Diameter of Hub	5"and Smaller	+3/32"(2.4mm) -1/32"(0.8mm)	Diameter of Hub at Base	When Hub Base is 24"or Smaller	±1/16"(1.6mm)*
	6"and Larger	+5/32"(4.0mm) -1/32"(0.8mm)		When Hub Base is Over 24"	±1/8"(3.2mm)*
Diameter of Contact Face	1/16"Raised Face	±1/32"(0.8mm)	Diameter of Contact Face	116"Raised Face	±1/32"(0.8mm)
	1/4"Raised Face Tongue & Groove Male,Female	±1/64"(0.4mm)		14"Raised Face Tongue &Groove Male,Female	±1/64"(0.4mm)
Diameter of Counterbore	Same as for Inside Diameter		Diameter of Hub at Point of Welding	5"and Smaller	+3/32"(2.4mm)* -1/32"(0.8mm)
				6"and Larger	+5/32"(4.0mm) -1/32"(0.8mm)
Drilling	Bolt Circle	±1/16"(1.6mm)	Drilling	Bolt Circle	±1/16"(1.6mm)
	Bolt Hole Spacing	±1/32"(0.8mm)		Bolt Hole Spacing	±1/32"(0.8mm)
	Eccentricity of Bolt Circle with Respect to Facing	21/2"Smaller 1/32"(0.8mm)Max. 3"&Larger 1/16"(1.6mm)Max		Eccentricity of Bolt Circle with Respect to Facing	21/2"Smaller 1/32"(0.8mm)Max. 3"&Larger 1/16"(1.6mm)Max.
	Eccentricity of Bolt Circle with Respect to Bore	1/32"(0.8mm)Max.*		Eccentricity of Bolt Circle with Respect to Bore	1/32"(0.8mm)Max.*
	Eccentricity of Facing with Respect to Bore	1/32"(0.8mm)Max.*		Eccentricity of Facing with Respect to Bore	1/32"(0.8mm)Max.*
Thickness	18"and Smaller	+1/8"(3.2mm).0^	Thickness	18"and Smaller	+1/8"(3.2mm),0"
	20"and Larger	+3/16"(4.8mm).04		20"and Larger	+3/16"(4.8mm).O
Length Thru Hub	10"and Smaller	±1/16"(1.6mm)	Length Thru Hub	10"and Smaller	±1/16"(1.6mm)
	12"and Larger	±1/8"(3.2mm)		12"and Larger	±1/8"(3.2mm)

Notes:
This tolerance is not covered in ANSI B16.5, but maker's option.
STANDARD FINISHES for Face of Flange (ANSI B16.5)
STOCK FINISH:
The most widely used gasket finish.because practically is suitable for all ordinary service conditions. This is a continuous spiral groove. Flanges size 12" (304.8mm)and smaller are produced with a 1/16" round-nosed tool at a feed of 1/32" per revolution. For sizes 14" (355.6mm)and larger. the finish is made with a 1/8" round-nosed tool at a feed of 3/64" per revolution.
SPIRAL SERRATED OR PHONOGRAPHIC:
This finish is produced by using a 90°round-nosed tool.
CONCENTRIC SERRATED:
This finish is produced by using a 90°round-nosed tool.
SMOOTH FINISH:
The cutting tool employed shall have an approximate 0.06"radius.
The resultant surface finish shall have a 125μ inch to 250μ inch(ANSI B16.5 para 6.4;4.1)
1. RAISED FACE AND LARGE MALE AND FEMALE
A serrated-concentric or serrated-spiral finish with 34 to 64 grooves per inch is used.
The cutting tool employed has an approximate 0.06 in.radius.The resultant surface finish shall have a 125μ inch(3.2m)to 500μ inch(12.5μm) approximate roughness.
2. TONGUE AND GROOVE AND SMALL MALE AND FEMALE
The gasket contact surface does not exceed 125μ in. (3.2μm)roughness
3. RING JOINT
The inside wall surface of the gasket groove does not exceed 63μin.(1.6μm)roughness,
4. BLIND
Blind flanges need not be faced in the center if, when this center part is raised, its diameter is at least 1 in. smaller than the inside diameter of the corresponding pressure class fittings. When the center part is depressed, its diameter is not greater than the inside diameter of the corresponding pressure class fittings. Machining of the depressed center is not required.
The manufacturing process of forged flanges begins with the selection of high-quality steel, which is heated and shaped under high pressure in forging dies to enhance its strength and durability. After forging, the flanges are trimmed, heat-treated to relieve internal stresses, and precisely machined to meet the required dimensions. They undergo rigorous inspection and testing for quality assurance, followed by surface treatments for enhanced corrosion resistance. This process results in flanges that are strong, reliable, and suitable for demanding industrial environments.
Company Profile
Dingxiang Country Gu Cheng Forging Company Ltd. is a leading manufacturer in Dingxiang County, Shanxi Province, known as the "Forging Capital of China." Established with a deep-rooted history in forging, we specialize in producing high-quality flanges and forged components for a wide range of industrial applications. Our extensive product line includes ANSI, DIN, JIS, and EN standard flanges and customized forged parts designed to meet specific customer requirements.
Gu Cheng Forging with over 30 years of experience in producing high-quality forged flanges. Including Weld Neck Flange (WN), Slip-On Flange (SO), Blind Flange (BL), Socket Weld Flange (SW), Lap Joint Flange, Plate Flange, and Customized forged flange.
At Gu Cheng Forging, we serve a global market, providing flanges and forged components for industries such as oil and gas, chemical processing, power generation, shipbuilding, and more. We pride ourselves on our ability to deliver tailored solutions, meeting the highest standard of safety, performance, and efficiency.
As a factory, we can tailor flanges based on your specific requirements for size, material, pressure rating, and surface treatment (galvanization, black paint, etc.). By preventing rust and deterioration, the coating enhances the flange's performance, offering long-term resilience and reducing maintenance needs over time.
Dingxiang Country Gu Cheng Forging Company Ltd, strives to be a trusted partner for all your forging needs, ensuring long-term cooperation and mutual success.
Q1: Are you a manufacturer or a trading company?
A1: We are a professional manufacturer with over 30 years of experience in forging flanges. Our factory is located in Dingxiang, China, known as the "Forging Capital." We produce high-quality, customized forged flanges, offering factory-direct pricing and ensuring top-notch quality.
Q2: What types of flanges do you produce?
A2: We manufacture a wide range of forged flanges, including:
Weld Neck Flange (WN) Slip-On Flange (SO) Blind Flange (BL) Socket Weld Flange (SW) Threaded Flange (TH) Lap Joint Flange Plate Flange All our flanges comply with international standards such as ASME, DIN, JIS, and BS.
Q3: What materials do you use?
A3: We offer flanges in a variety of materials, including: Carbon Steel Stainless Steel Alloy Steel Each material is sourced from certified suppliers, ensuring durability and performance in diverse industrial applications.
Q4: Can you provide customized flanges?
A4: Absolutely! As a factory, we specialize in customization. We can tailor flanges based on your specific requirements for size, material, pressure rating, and surface treatment (galvanization, black paint, etc.).
Q5: How do you ensure the quality of your products?
A5: Quality is our top priority. Every flange undergoes a strict inspection process, including:
Material analysis Dimensional checks Pressure testing Surface treatment inspections Our CNC machining ensures precise dimensions, and we adhere to strict international standards throughout the manufacturing process.

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