Table of Contents

WELD NECK FLANGES DIMENSIONS IN INCHES

Weld Neck Flange Dimensions

Welding the tubing to the flange’s neck secures these pipe flanges. Instead of transferring stress from the flange to the drain, this process transfers it to the pipe. It also decreases the tension concentration at the hub’s center. Weld neck flanges are commonly used in applications involving high pressure. The flange’s inside diameter is matched to the pipe’s inside diameter. The published specifications for weld neck pipe flanges with a hub range from 1/2″ to 96″. These are available in a variety of material grades, specifications, and sizes from our business.

About Weld Neck Flanges

Nitech Stainless is the leading Weld Neck Flanges Supplier, Manufacturer, Dealer, and Exporter in India. Nitech Stainless is known worldwide for its extensive high-quality range of Buttwelded Pipe Fittings. At Nitech Stainless we have our own research center to help gather the required knowledge about the latest technologies and keep on increasing the quality of the product with each new research in our research center.

The charts show the dimensions of weld neck flange class 150, 300, 400, 900, 1500, 2500 in inches

Weld neck flange dimensions class 150 (ASME B16.5) in inches

Flange NPS	Inside Diameter	Outside Diameter	Bolt Circle (BC)	Raised Face (R)	Raised Face (RF)	H	H1	Raised Face Thickness (T)	T1	Flat Face Thickness (T2)	Bolt Hole (B)	No. of Bolt Holes
1/2″	0.62″	3.75″	2.62″	1.38″	.063″	1.50″	0.84″	2.06″	.50″	2.00″	0.62″	4
3/4″	0.82″	4.62″	3.25″	1.69″	.063″	1.88″	1.05″	2.25″	.56″	2.19″	0.75″	4
1″	1.05″	4.88″	3.50″	2.00″	.063″	2.12″	1.32″	2.44″	.63″	2.38″	0.75″	4
1-1/4″	1.38″	5.25″	3.88″	2.50″	.063″	2.50″	1.66″	2.56″	.69″	2.50″	0.75″	4
1-1/2″	1.61″	6.12″	4.50″	2.88″	.063″	2.75″	1.90″	2.69″	.75″	2.63″	0.88″	4
2″	2.07″	6.50″	5.00″	3.62″	.063″	3.31″	2.38″	2.75″	.82″	2.69″	0.75″	8
2-1/2″	2.47″	7.50″	5.88″	4.12″	.063″	3.94″	2.88″	3.00″	.94″	2.94″	0.88″	8
3″	3.07″	8.25″	6.62″	5.00″	.063″	4.62″	3.50″	3.12″	1.06″	3.06″	0.88″	8
3-1/2″	3.55″	9.00″	7.25″	5.50″	.063″	5.25″	4.00″	3.19″	1.13″	3.13″	0.88″	8
4″	4.03″	10.00″	7.88″	6.19″	.063″	5.75″	4.50″	3.38″	1.19″	3.32″	0.88″	8
5″	5.05″	11.00″	9.25″	7.31″	.063″	7.00″	5.56″	3.88″	1.32″	3.82″	0.88″	8
6″	6.07″	12.50″	10.62″	8.50″	.063″	8.12″	6.63″	3.88″	1.38″	3.82″	0.88″	12
8″	7.98″	15.00″	13.00″	10.62″	.063″	10.25″	8.63″	4.38″	1.56″	4.32″	1.00″	12
10″	10.02″	17.50″	15.25″	12.75″	.063″	12.62″	10.75″	4.62″	1.82″	4.56″	1.12″	16
12″	12.00″	20.50″	17.75″	15.00″	.063″	14.75″	12.75″	5.12″	1.94″	5.06″	1.25″	16
14″	13.25″	23.00″	20.25″	16.25″	.063″	16.75″	14.00″	5.62″	2.06″	5.56″	1.25″	20
16″	15.25″	25.50″	22.50″	18.50″	.063″	19.00″	16.00″	5.75″	2.19″	5.69″	1.38″	20
18″	17.25″	28.00″	24.75″	21.00″	.063″	21.00″	18.00″	6.25″	2.32″	6.19″	1.38″	24
20″	19.25″	30.50″	27.00″	23.00″	.063″	23.12″	20.00″	6.38″	2.44″	6.32″	1.38″	24
22″	21.25″	33.00″	29.25″	25.25″	.063″	25.25″	22.00″	6.50″	2.57″	6.44″	1.62″	24
24″	23.25″	36.00″	32.0″	27.25″	.063″	27.62″	24.00″	6.62″	2.69″	6.56″	1.62″	24

Weld neck flange dimensions class 300 (ASME B16.5) in inches

Flange NPS	Inside Diameter	Outside Diameter	Bolt Circle (BC)	Raised Face (R)	Raised Face (RF)	H	H1	Raised Face Thickness (T)	T1	Flat Face Thickness (T2)	Bolt Hole (B)	No. of Bolt Holes
1/2″	0.62″	3.75″	2.62″	1.38″	.063″	1.50″	0.84″	2.06″	.50″	2.00″	0.62″	4
3/4″	0.82″	4.62″	3.25″	1.69″	.063″	1.88″	1.05″	2.25″	.56″	2.19″	0.75″	4
1″	1.05″	4.88″	3.50″	2.00″	.063″	2.12″	1.32″	2.44″	.63″	2.38″	0.75″	4
1-1/4″	1.38″	5.25″	3.88″	2.50″	.063″	2.50″	1.66″	2.56″	.69″	2.50″	0.75″	4
1-1/2″	1.61″	6.12″	4.50″	2.88″	.063″	2.75″	1.90″	2.69″	.75″	2.63″	0.88″	4
2″	2.07″	6.50″	5.00″	3.62″	.063″	3.31″	2.38″	2.75″	.82″	2.69″	0.75″	8
2-1/2″	2.47″	7.50″	5.88″	4.12″	.063″	3.94″	2.88″	3.00″	.94″	2.94″	0.88″	8
3″	3.07″	8.25″	6.62″	5.00″	.063″	4.62″	3.50″	3.12″	1.06″	3.06″	0.88″	8
3-1/2″	3.55″	9.00″	7.25″	5.50″	.063″	5.25″	4.00″	3.19″	1.13″	3.13″	0.88″	8
4″	4.03″	10.00″	7.88″	6.19″	.063″	5.75″	4.50″	3.38″	1.19″	3.32″	0.88″	8
5″	5.05″	11.00″	9.25″	7.31″	.063″	7.00″	5.56″	3.88″	1.32″	3.82″	0.88″	8
6″	6.07″	12.50″	10.62″	8.50″	.063″	8.12″	6.63″	3.88″	1.38″	3.82″	0.88″	12
8″	7.98″	15.00″	13.00″	10.62″	.063″	10.25″	8.63″	4.38″	1.56″	4.32″	1.00″	12
10″	10.02″	17.50″	15.25″	12.75″	.063″	12.62″	10.75″	4.62″	1.82″	4.56″	1.12″	16
12″	12.00″	20.50″	17.75″	15.00″	.063″	14.75″	12.75″	5.12″	1.94″	5.06″	1.25″	16
14″	13.25″	23.00″	20.25″	16.25″	.063″	16.75″	14.00″	5.62″	2.06″	5.56″	1.25″	20
16″	15.25″	25.50″	22.50″	18.50″	.063″	19.00″	16.00″	5.75″	2.19″	5.69″	1.38″	20
18″	17.25″	28.00″	24.75″	21.00″	.063″	21.00″	18.00″	6.25″	2.32″	6.19″	1.38″	24
20″	19.25″	30.50″	27.00″	23.00″	.063″	23.12″	20.00″	6.38″	2.44″	6.32″	1.38″	24
22″	21.25″	33.00″	29.25″	25.25″	.063″	25.25″	22.00″	6.50″	2.57″	6.44″	1.62″	24
24″	23.25″	36.00″	32.0″	27.25″	.063″	27.62″	24.00″	6.62″	2.69″	6.56″	1.62″	24

Weld neck flange dimensions class 400 (ASME B16.5) in inches

Flange NPS	Inside Diameter	Outside Diameter	Bolt Circle (BC)	Raised Face (R)	Raised Face (RF)	H	H1	Raised Face Thickness (T)	T1	Flat Face Thickness (T2)	Bolt Hole (B)	No. of Bolt Holes
1/2″	.55″	3.75″	2.62″	1.38″	.250″	1.50″	0.84″	2.31″	0.56″	2.06″	0.62″	4
3/4″	.74″	4.62″	3.25″	1.69″	.250″	1.88″	1.05″	2.50″	0.62″	2.25″	0.75″	4
1″	.96″	4.88″	3.50″	2.00″	.250″	2.12″	1.32″	2.69″	0.69″	2.44″	0.75″	4
1-1/4″	1.28″	5.25″	3.88″	2.50″	.250″	2.50″	1.66″	2.87″	0.81″	2.62″	0.75″	4
1-1/2″	1.50″	6.12″	4.50″	2.88″	.250″	2.75″	1.90″	3.00″	0.88″	2.75″	0.88″	4
2″	1.94″	6.50″	5.00″	3.62″	.250″	3.31″	2.38″	3.13″	1.00″	2.88″	0.75″	8
2-1/2″	2.32″	7.50″	5.88″	4.12″	.250″	3.94″	2.88″	3.37″	1.12″	3.12″	0.88″	8
3″	2.90″	8.25″	6.62″	5.00″	.250″	4.62″	3.50″	3.50″	1.25″	3.25″	0.88″	8
3-1/2″	3.36″	9.00″	7.25″	5.50″	.250″	5.25″	4.00″	3.63″	1.38″	3.38″	1.00″	8
4″	3.83″	10.00″	7.88″	6.19″	.250″	5.75″	4.50″	3.75″	1.38″	3.50″	1.00″	8
5″	4.81″	11.00″	9.25″	7.31″	.250″	7.00″	5.56″	4.25″	1.50″	4.00″	1.00″	8
6″	5.76″	12.50″	10.62″	8.50″	.250″	8.12″	6.63″	4.31″	1.62″	4.06″	1.00″	12
8″	7.63″	15.00″	13.00″	10.62″	.250″	10.25″	8.63″	4.87″	1.88″	4.62″	1.12″	12
10″	9.75″	17.50″	15.25″	12.75″	.250″	12.62″	10.75″	5.13″	2.12″	4.88″	1.25″	16
12″	11.75″	20.50″	17.75″	15.00″	.250″	14.75″	12.75″	5.63″	2.25″	5.38″	1.38″	16
14″	13.00″	23.00″	20.25″	16.25″	.250″	16.75″	14.00″	6.13″	2.38″	5.88″	1.38″	20
16″	15.00″	25.50″	22.50″	18.50″	.250″	19.00″	16.00″	6.25″	2.50″	6.00″	1.50″	20
18″	17.00″	28.00″	24.75″	21.00″	.250″	21.00″	18.00″	6.75″	2.62″	6.50″	1.50″	24
20″	19.00″	30.50″	27.00″	23.00″	.250″	23.12″	20.00″	6.87″	2.75″	6.62″	1.62″	24
22″	21.00″	33.00″	29.25″	25.25″	.250″	25.25″	22.00″	7.00″	2.88″	6.75″	1.75″	24
24″	23.00″	36.00″	32.00″	27.25″	.250″	27.62″	24.00″	7.13″	3.00″	6.88″	1.88″	24

Weld neck flange dimensions class 600 (ASME B16.5) in inches

Flange NPS	Inside Diameter	Outside Diameter	Bolt Circle (BC)	Raised Face (R)	Raised Face (RF)	H	H1	Raised Face Thickness (T)	T1	Flat Face Thickness (T2)	Bolt Hole (B)	No. of Bolt Holes
1/2″	0.55″	3.75″	2.62″	1.38″	.250″	1.50″	0.84″	2.31″	0.56″	2.06″	0.62″	4
3/4″	0.74″	4.62″	3.25″	1.69″	.250″	1.88″	1.05″	2.50″	0.62″	2.25″	0.75″	4
1″	0.96″	4.88″	3.50″	2.00″	.250″	2.12″	1.32″	2.69″	0.69″	2.44″	0.75″	4
1-1/4″	1.28″	5.25″	3.88″	2.50″	.250″	2.50″	1.66″	2.87″	0.81″	2.62″	0.75″	4
1-1/2″	1.50″	6.12″	4.50″	2.88″	.250″	2.75″	1.90″	3.00″	0.88″	2.75″	0.88″	4
2″	1.94″	6.50″	5.00″	3.62″	.250″	3.31″	2.38″	3.13″	1.00″	2.88″	0.75″	8
2-1/2″	2.32″	7.50″	5.88″	4.12″	.250″	3.94″	2.88″	3.37″	1.12″	3.12″	0.88″	8
3″	2.90″	8.25″	6.62″	5.00″	.250″	4.62″	3.50″	3.50″	1.25″	3.25″	0.88″	8
3-1/2″	3.36″	9.00″	7.25″	5.50″	.250″	5.25″	4.00″	3.63″	1.38″	3.38″	1.00″	8
4″	3.83″	10.75″	8.50″	6.19″	.250″	6.00″	4.50″	4.25″	1.5″	4.00″	1.00″	8
5″	4.81″	13.00″	10.50″	7.31″	.250″	7.44″	5.56″	4.75″	1.75″	4.50″	1.12″	8
6″	5.76″	14.00″	11.50″	8.50″	.250″	8.75″	6.63″	4.87″	1.88″	4.62″	1.12″	12
8″	7.63″	16.50″	13.75″	10.62″	.250″	10.75″	8.63″	5.50″	2.19″	5.25″	1.25″	12
10″	9.75″	20.00″	17.00″	12.75″	.250″	13.5″	10.75″	6.25″	2.50″	6.00″	1.38″	16
12″	11.75″	22.00″	19.25″	15.00″	.250″	15.75″	12.75″	6.37″	2.62″	6.12″	1.38″	20
14″	13.00″	23.75″	20.75″	16.25″	.250″	17.00″	14.00″	6.75″	2.75″	6.50″	1.50″	20
16″	15.00″	27.00″	23.75″	18.50″	.250″	19.50″	16.00″	7.25″	3.00″	7.00″	1.62″	20
18″	17.00″	29.25″	25.75″	21.00″	.250″	21.50″	18.00″	7.50″	3.25″	7.25″	1.75″	20
20″	19.00″	32.00″	28.50″	23.00″	.250″	24.00″	20.00″	7.75″	3.50″	7.50″	1.75″	24
22″	21.00″	34.25″	30.63″	25.25″	.250″	26.25″	22.00″	8.00″	3.75″	7.75″	1.75″	24
24″	23.00″	37.00″	33.00″	27.25″	.250″	28.25″	24.00″	8.25″	4.00″	8.00″	2.00″	24

Weld neck flange dimensions class 900 (ASME B16.5) in inches

Flange NPS	Inside Diameter	Outside Diameter	Bolt Circle (BC)	Raised Face (R)	Raised Face (RF)	H	H1	Raised Face Thickness (T)	T1	Flat Face Thickness (T2)	Bolt Hole (B)	No. of Bolt Holes
3″	2.90″	9.50″	7.50″	5.00″	.250″	5.00″	3.50″	4.25″	1.50″	4.00″	1.00″	8
4″	3.83″	11.50″	9.25″	6.19″	.250″	6.25″	4.50″	4.75″	1.75″	4.50″	1.25″	8
5″	4.81″	13.75″	11.00″	7.31″	.250″	7.50″	5.56″	5.25″	3.00″	5.00″	1.38″	8
6″	5.76″	15.00″	12.50″	8.50″	.250″	9.25″	6.63″	5.75″	2.19″	5.50″	1.25″	12
8″	7.63″	18.50″	15.50″	10.63″	.250″	11.75″	8.63″	6.63″	2.50″	6.38″	1.50″	12
10″	9.75″	21.50″	18.50″	12.75″	.250″	14.50″	10.75″	7.50″	2.75″	7.25″	1.50″	16
12″	11.75″	24.00″	21.00″	15.00″	.250″	16.50″	12.75″	8.13″	3.13″	7.88″	1.50″	20
14″	13.00″	25.25″	22.00″	16.25″	.250″	17.75″	14.00″	8.63″	3.38″	8.38″	1.63″	20
16″	15.00″	27.75″	24.25″	18.50″	.250″	20.00″	16.00″	8.75″	3.50″	8.50″	1.75″	20
18″	17.00″	31.00″	27.00″	21.00″	.250″	22.25″	18.00″	9.25″	4.00″	9.00″	2.00″	20
20″	19.00″	33.75″	29.50″	23.00″	.250″	24.50″	20.00″	10.00″	4.25″	9.75″	2.13″	20
24″	23.00″	41.00″	35.50″	27.25″	.250″	29.50″	24.00″	11.75″	5.50″	11.50″	2.63″	20

Weld neck flange dimensions class 1500 (ASME B16.5) in inches

Flange NPS	Inside Diameter	Outside Diameter	Bolt Circle (BC)	Raised Face (R)	Raised Face (RF)	H	H1	Raised Face Thickness (T)	T1	Flat Face Thickness (T2)	Bolt Hole (B)	No. of Bolt Holes
1/2″	0.55″	4.75″	3.25″	1.38″	.250″	1.50″	0.84″	2.63″	0.88″	2.38″	0.88″	4
3/4″	0.74″	5.13″	3.50″	1.69″	.250″	1.75″	1.05″	3.00″	1.00″	2.75″	0.88″	4
1″	0.96″	5.88″	4.00″	2.00″	.250″	2.06″	1.32″	3.13″	1.13″	2.88″	1.00″	4
1-1/4″	1.28″	6.25″	4.38″	2.50″	.250″	2.50″	1.66″	3.13″	1.13″	2.88″	1.00″	4
1-1/2″	1.50″	7.00″	4.88″	2.88″	.250″	2.75″	1.90″	3.50″	1.25″	3.25″	1.13″	4
2″	1.94″	8.50″	6.50″	3.63″	.250″	4.13″	2.38″	4.25″	1.50″	4.00″	1.00″	8
2-1/2″	2.32″	9.63″	7.50″	4.13″	.250″	4.88″	2.88″	4.38″	1.63″	4.13″	1.13″	8
3″	2.90″	10.50″	8.00″	5.00″	.250″	5.25″	3.50″	4.88″	1.88″	4.63″	1.25″	8
4″	3.83″	12.25″	9.50″	6.19″	.250″	6.38″	4.50″	5.13″	2.13″	4.88″	1.38″	8
5″	4.81″	14.75″	11.50″	7.31″	.250″	7.75″	5.56″	6.38″	2.88″	6.13″	1.63″	8
6″	5.76″	15.50″	12.50″	8.50″	.250″	9.00″	6.63″	7.00″	3.25″	6.75″	1.50″	12
8″	7.63″	19.00″	15.50″	10.63″	.250″	11.50″	8.63″	8.63″	3.63″	8.38″	1.75″	12
10″	9.75″	23.00″	19.00″	12.75″	.250″	14.50″	10.75″	10.25″	4.25″	10.00″	2.00″	12
12″	11.75″	26.50″	22.50″	15.00″	.250″	17.75″	12.75″	11.38″	4.88″	11.13″	2.13″	16
14″	13.00″	29.50″	25.00″	16.25″	.250″	19.50″	14.00″	12.00″	5.25″	11.75″	2.38″	16
16″	15.00″	32.50″	27.75″	18.50″	.250″	21.75″	16.00″	12.50″	5.75″	12.25″	2.63″	16
18″	17.00″	36.00″	30.50″	21.00″	.250″	23.50″	18.00″	13.13″	6.38″	12.88″	2.88″	16
20″	19.00″	38.75″	32.75″	23.00″	.250″	25.25″	20.00″	14.25″	7.00″	14.00″	3.13″	16
24″	23.00″	46.00″	39.00″	27.25″	.250″	30.00″	24.00″	16.25″	8.00″	16.00″	3.63″	16

Flanges Manufacturers, Suppliers, Dealers in India

Types of Flanges we Manufacturers in India
Slip-On Flanges	Weld Neck Flanges	Long Weld Neck Flanges
Blind Flanges	Threaded Flanges	Socket Weld Flanges
Lap Joint Flanges	Studding Outlet Flanges	Companion Flanges