B16.5 class range

ANSI / ASME B16.5 Class 150 / 300 Flanges

Class 150 and Class 300 are common ASME B16.5 RFQ ratings for European distributors and project buyers purchasing American standard flanges.

ASME B16.5 NPS size range Class-rated supply Traceable documents

Send Inquiry Certificates

Back to ANSI / ASME B16.5 flanges

Reference scope

Common order references

Standard / Type	Product	Typical scope
Class 150	Common distributor and project demand	NPS, type, facing and material required
Class 300	Higher pressure RFQ range	Drawing or schedule details helpful

Product data

Dimensions and specification tables

ANSI / ASME B16.5 Class 150 weld neck flange RF dimensions

NPS	OD D mm	Thickness b mm	Raised face g mm	Bolt circle k mm	Holes	Hole dia. l mm	Approx. kg
1/2"	88.9	11.1	34.9	60.3	4	15.9	0.500
3/4"	98.4	12.7	42.9	69.8	4	15.9	0.700
1"	107.9	14.3	50.8	79.4	4	15.9	1.100
1 1/4"	117.5	15.9	63.5	88.9	4	15.9	1.500
1 1/2"	127.0	17.5	73.0	98.4	4	15.9	1.800
2"	152.4	19.0	92.1	120.6	4	19.0	2.700
2 1/2"	177.8	22.2	104.8	139.7	4	19.0	4.400
3"	190.5	23.8	127.0	152.4	4	19.0	5.200
3 1/2"	215.9	23.8	139.7	177.8	8	19.0	6.400
4"	228.6	23.8	157.2	190.5	8	19.0	7.500
5"	254.0	23.8	185.7	215.9	8	22.2	9.200
6"	279.4	25.4	215.9	241.3	8	22.2	11.000
8"	342.9	28.6	269.9	298.4	8	22.2	18.300
10"	406.4	30.2	323.8	361.9	12	25.4	25.000
12"	482.6	31.7	381.0	431.8	12	25.4	39.000
14"	533.4	34.9	412.7	476.2	12	28.6	51.000
16"	596.9	36.5	469.9	539.7	16	28.6	60.000
18"	635.0	39.7	533.4	577.8	16	31.7	71.000
20"	698.5	42.9	584.2	635.0	20	31.7	88.000
22"	749.3	46.0	641.2	692.1	20	34.9	102.000
24"	812.8	47.6	692.1	749.3	20	34.9	119.000

ANSI / ASME B16.5 Class 300 weld neck flange RF dimensions

NPS	OD D mm	Thickness b mm	Raised face g mm	Bolt circle k mm	Holes	Hole dia. l mm	Approx. kg
1/2"	95.2	14.3	34.9	66.7	4	15.9	0.900
3/4"	117.5	15.9	42.9	82.5	4	19.0	1.500
1"	123.8	17.5	50.8	88.9	4	19.0	1.900
1 1/4"	133.3	19.0	63.5	98.4	4	19.0	2.600
1 1/2"	155.6	20.6	73.0	114.3	4	22.2	3.300
2"	165.1	22.2	92.1	127.0	8	19.0	3.600
2 1/2"	190.5	25.4	104.8	149.2	8	22.2	5.400
3"	209.5	28.6	127.0	168.3	8	22.2	7.400
3 1/2"	228.6	30.2	139.7	184.1	8	22.2	8.900
4"	254.0	31.7	157.2	200.0	8	22.2	11.900
5"	279.4	34.9	185.7	234.9	8	22.2	16.000
6"	317.5	36.5	215.9	269.9	12	22.2	20.200
8"	381.0	41.3	269.9	330.2	12	25.4	31.000
10"	444.5	47.6	323.4	387.3	16	28.6	44.300
12"	520.7	50.8	381.0	450.8	16	31.7	64.000
14"	584.2	54.0	412.7	514.3	20	31.7	88.000
16"	647.7	57.1	469.9	571.5	20	34.9	113.000
18"	711.2	60.3	533.4	628.6	24	34.9	134.000
20"	774.7	63.5	584.2	685.8	24	34.9	171.000
22"	838.2	66.7	641.2	742.9	24	41.3	195.000
24"	914.4	69.8	692.1	812.8	24	41.3	238.000

ANSI / ASME B16.5 Class 150 plate ring flange RF dimensions

NPS	OD D mm	Thickness b mm	Raised face g mm	Bolt circle k mm	Holes	Hole dia. l mm	Approx. kg
1/2"	88.9	11.1	34.9	60.3	4	15.9	0.400
3/4"	98.4	12.7	42.9	69.8	4	15.9	0.700
1"	107.9	14.3	50.8	79.4	4	15.9	0.800
1 1/4"	117.5	15.9	63.5	88.9	4	15.9	1.100
1 1/2"	127.0	17.5	73.0	98.4	4	15.9	1.400
2"	152.4	19.0	92.1	120.6	4	19.0	2.200
2 1/2"	177.8	22.2	104.8	139.7	4	19.0	3.600
3"	190.5	23.8	127.0	152.4	4	19.0	4.100
4"	228.6	23.8	157.2	190.5	8	19.0	5.600
6"	279.4	25.4	215.9	241.3	8	22.2	7.500
8"	342.9	28.6	269.9	298.4	8	22.2	12.600
10"	406.4	30.2	323.8	361.9	12	25.4	18.500
12"	482.6	31.7	381.0	431.8	12	25.5	28.000
16"	596.9	36.5	469.9	539.7	16	28.6	46.000
20"	698.5	42.9	584.2	635.0	20	31.7	64.000
24"	812.8	47.6	692.1	749.3	20	34.9	89.000

ANSI / ASME B16.5 Class 300 plate flange RF dimensions

NPS	OD D mm	Thickness b mm	Raised face g mm	Bolt circle k mm	Holes	Hole dia. l mm	Approx. kg
1/2"	95.6	14.3	34.9	66.7	4	15.9	0.700
3/4"	117.5	15.9	42.9	82.5	4	19.0	1.100
1"	123.8	17.5	50.8	88.9	4	19.0	1.400
1 1/2"	155.6	20.6	73.0	114.3	4	22.2	2.600
2"	165.1	22.2	92.1	127.0	8	19.0	3.400
3"	209.5	28.6	127.0	168.3	8	22.2	6.100
4"	254.0	31.7	157.2	200.0	8	22.2	10.100
6"	317.5	36.5	215.9	269.9	12	22.2	14.100
8"	381.0	41.3	269.9	330.2	12	25.4	24.800
10"	444.5	47.6	323.8	387.3	16	28.6	37.100
12"	520.7	50.8	381.0	450.8	16	31.7	50.000
16"	647.7	57.1	469.9	571.5	20	34.9	90.000
20"	774.7	63.5	584.2	685.8	24	34.9	133.000
24"	914.4	69.8	692.1	812.8	24	41.3	208.000

ANSI / ASME B16.5 Class 150 slip on flange RF / FF dimensions

NPS	OD D mm	Thickness b mm	Raised face g mm	Bolt circle k mm	Holes	Hole dia. l mm	Approx. kg
1/2"	88.9	11.1	34.9	60.3	4	15.9	0.400
3/4"	98.4	12.7	42.9	69.8	4	15.9	0.700
1"	107.9	14.3	50.8	79.4	4	15.9	0.800
1 1/2"	127.0	17.5	73.0	98.4	4	15.9	1.400
2"	152.4	19.0	92.1	120.6	4	19.0	2.200
3"	190.5	23.8	127.0	152.4	4	19.0	4.100
4"	228.6	23.8	157.2	190.5	8	19.0	5.600
6"	279.4	25.4	215.9	241.3	8	22.2	7.500
8"	342.9	28.6	269.9	298.4	8	22.2	12.600
10"	406.4	30.2	323.8	361.9	12	25.4	18.500
12"	482.6	31.7	381.0	431.8	12	25.5	28.000
16"	596.9	36.5	469.9	539.7	16	28.6	46.000
20"	698.5	42.9	584.2	635.0	20	31.7	64.000
24"	812.8	47.6	692.1	749.3	20	34.9	89.000

ANSI / ASME B16.5 Class 300 slip on flange RF / FF dimensions

NPS	OD D mm	Thickness b mm	Raised face g mm	Bolt circle k mm	Holes	Hole dia. l mm	Approx. kg
1/2"	95.6	14.3	34.9	66.7	4	15.9	0.700
3/4"	117.5	15.9	42.9	82.5	4	19.0	1.100
1"	123.8	17.5	50.8	88.9	4	19.0	1.400
1 1/2"	155.6	20.6	73.0	114.3	4	22.2	2.600
2"	165.1	22.2	92.1	127.0	8	19.0	3.400
3"	209.5	28.6	127.0	168.3	8	22.2	6.100
4"	254.0	31.7	157.2	200.0	8	22.2	10.100
6"	317.5	36.5	215.9	269.9	12	22.2	14.100
8"	381.0	41.3	269.9	330.2	12	25.4	24.800
10"	444.5	47.6	323.8	387.3	16	28.6	37.100
12"	520.7	50.8	381.0	450.8	16	31.7	50.000
16"	647.7	57.1	469.9	571.5	20	34.9	90.000
20"	774.7	63.5	584.2	685.8	24	34.9	133.000
24"	914.4	69.8	692.1	812.8	24	41.3	208.000

ANSI / ASME B16.5 Class 150 blind flange dimensions

NPS	OD D mm	Thickness b mm	Raised face g mm	Bolt circle k mm	Holes	Hole dia. l mm	Approx. kg
1/2"	88.9	11.1	34.9	60.3	4	15.9	0.400
3/4"	98.4	12.7	42.9	69.8	4	15.9	0.700
1"	107.9	14.3	50.8	79.4	4	15.9	0.900
1 1/2"	127.0	17.5	73.0	98.4	4	15.9	1.600
2"	152.4	19.0	92.1	120.6	4	19.0	2.600
3"	190.5	23.8	127.0	152.4	4	19.0	5.000
4"	228.6	23.8	157.2	190.5	8	19.0	7.100
6"	279.4	25.4	215.9	241.3	8	22.2	11.800
8"	342.9	28.6	269.9	298.4	8	22.2	21.000
10"	406.4	30.2	323.4	361.9	12	25.4	30.000
12"	482.6	31.7	381.0	431.8	12	25.4	45.000
16"	596.9	36.5	469.9	539.9	16	28.6	79.000
20"	698.5	42.9	584.2	635.0	20	31.7	124.000
24"	812.8	47.6	692.1	749.3	20	34.9	188.000

ANSI / ASME B16.5 Class 300 blind flange dimensions

NPS	OD D mm	Thickness b mm	Raised face g mm	Bolt circle k mm	Holes	Hole dia. l mm	Approx. kg
1/2"	95.2	14.3	34.9	66.7	4	15.9	0.700
3/4"	117.5	15.9	42.9	82.5	4	19.0	1.200
1"	123.8	17.5	50.8	88.9	4	19.0	1.500
1 1/2"	155.6	20.6	73.0	114.3	4	22.2	2.900
2"	165.1	22.2	92.1	127.0	8	19.0	3.400
3"	209.5	28.6	127.0	168.3	8	22.2	7.000
4"	254.0	31.7	157.2	200.0	8	22.2	11.800
6"	317.5	36.5	215.9	269.9	12	22.2	21.300
8"	381.0	41.3	269.9	330.2	12	25.4	35.200
10"	444.5	47.6	323.8	387.3	16	28.6	57.000
12"	520.7	50.8	381.0	450.8	16	31.7	82.000
16"	647.7	57.1	469.9	571.5	20	34.9	140.000
20"	774.7	63.5	584.2	685.8	24	34.9	223.000
24"	914.4	69.8	692.1	812.8	24	41.3	345.000

ANSI / ASME B16.5 Class 150 socket weld flange RF dimensions

NPS	OD in	Thickness in	Bolt circle in	Holes	Hole dia. in	Approx. lb
1/2"	3.5	0.44	2.38	4	0.62	1
3/4"	3.88	0.5	2.75	4	0.62	2
1"	4.25	0.56	3.12	4	0.62	2
1 1/2"	5	0.69	3.88	4	0.62	3
2"	6	0.75	4.75	4	0.75	5
3"	7.5	0.94	6	4	0.75	8
4"	9	0.94	7.5	8	0.75	13
6"	11	1	9.5	8	0.88	19
8"	13.5	1.12	11.75	8	0.88	30
10"	16	1.19	14.25	12	1	43
12"	19	1.25	17	12	1	64
16"	23.5	1.44	21.25	16	1.12	98
20"	27.5	1.69	25	20	1.25	165
24"	32	1.88	29.5	20	1.38	220

ANSI / ASME B16.5 Class 300 socket weld flange RF dimensions

NPS	OD in	Thickness in	Bolt circle in	Holes	Hole dia. in	Approx. lb
1/2"	3.75	0.56	2.62	4	0.62	2
3/4"	4.62	0.62	3.25	4	0.75	3
1"	4.88	0.69	3.5	4	0.75	3
1 1/2"	6.12	0.81	4.5	4	0.88	6
2"	6.5	0.88	5	8	0.75	7
3"	8.25	1.12	6.62	8	0.88	13
4"	10	1.25	7.88	8	0.88	22
6"	12.5	1.44	10.62	12	0.88	39
8"	15	1.62	13	12	1	58
10"	17.5	1.88	15.25	16	1.12	81
12"	20.5	2	17.75	16	1.25	115
16"	25.5	2.25	22.5	20	1.38	190
20"	30.5	2.5	27	24	1.38	315
24"	36	2.75	32	24	1.62	475

ANSI / ASME B16.5 Class 150 lap joint flange dimensions

NPS	OD in	Thickness in	Bolt circle in	Holes	Hole dia. in	Approx. lb
1/2"	3.5	0.44	2.38	4	0.62	1
3/4"	3.88	0.5	2.75	4	0.62	2
1"	4.25	0.56	3.12	4	0.62	2
1 1/2"	5	0.69	3.88	4	0.62	3
2"	6	0.75	4.75	4	0.75	5
3"	7.5	0.94	6	4	0.75	8
4"	9	0.94	7.5	8	0.75	13
6"	11	1	9.5	8	0.88	19
8"	13.5	1.12	11.75	8	0.88	30
10"	16	1.19	14.25	12	1	43
12"	19	1.25	17	12	1	64
16"	23.5	1.44	21.25	16	1.12	140
20"	27.5	1.69	25	20	1.25	195
24"	32	1.88	29.5	20	1.38	275

ANSI / ASME B16.5 Class 300 lap joint flange dimensions

NPS	OD in	Thickness in	Bolt circle in	Holes	Hole dia. in	Approx. lb
1/2"	3.75	0.56	2.62	4	0.62	2
3/4"	4.62	0.62	3.25	4	0.75	3
1"	4.88	0.69	3.5	4	0.75	3
1 1/2"	6.12	0.81	4.5	4	0.88	6
2"	6.5	0.88	5	8	0.75	7
3"	8.25	1.12	6.62	8	0.88	13
4"	10	1.25	7.88	8	0.88	22
6"	12.5	1.44	10.62	12	0.88	39
8"	15	1.62	13	12	1	58
10"	17.5	1.88	15.25	16	1.12	91
12"	20.5	2	17.75	16	1.25	140
16"	25.5	2.25	22.5	20	1.38	250
20"	30.5	2.5	27	24	1.38	370
24"	36	2.75	32	24	1.62	550

Use these tables for RFQ preparation. Final production should be confirmed against the required standard edition, drawing, material grade and certificate requirement.

Supply notes

Supply and order notes

Common purchasing range

Class 150 and 300 inquiries often cover WNRF, SORF, blind, plate, threaded, socket weld and lap joint flange types.

RFQ details

Confirm NPS size, type, facing, material, bore or pipe schedule, certificate need and packing method.

Technical purchasing support

How Hyupshin turns the specification into a controlled flange order.

Dimension control

ANSI / ASME B16.5 production dimensions

Our technical team compares the requested standard edition and project drawing, then releases the applicable dimensions to production.

Pressure and facing

CLASS 150, CLASS 300

We record the Class, RF, FF or RTJ facing, bore or pipe schedule and tolerance notes on each ASME quotation line.

Product geometry

flange type manufacturing details

Flange type, sealing face, drilling, thickness and machining details are checked together so production and inspection use the same specification.

Documents

Certificate and inspection records

Our order file carries the agreed EN 10204 3.1, PED, AD 2000, UKCA, PMI, NDT and third-party inspection scope through to shipment.

Send this product for quotation

Request a quotation for this flange

Send the ASME B16.5 flange type, NPS, Class, facing, bore or pipe schedule, material grade, quantity and certificate requirement.

Send Inquiry