B16.5 class range

ANSI / ASME B16.5 Class 400 / 600 Flanges

For Class 400 and 600 B16.5 flanges, our order review gives additional attention to flange type, facing, bore, material and certificate scope.

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

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Reference scope

Common order references

Standard / Type	Product	Typical scope
Class 400	Project-based demand	Type and facing recorded per item
Class 600	Pressure piping demand	Bore / schedule confirmation recommended

Product data

Dimensions and specification tables

ANSI / ASME B16.5 Class 600 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	20.6	63.5	98.4	4	19.0	2.600
1 1/2"	155.6	22.2	73.0	114.3	4	22.2	3.300
2"	165.1	25.4	92.1	127.0	8	19.0	4.700
2 1/2"	190.5	28.6	104.8	149.2	8	22.2	6.500
3"	209.5	31.7	127.0	168.3	8	22.2	8.700
3 1/2"	228.6	34.9	139.7	184.1	8	25.4	11.200
4"	273.0	38.1	157.2	215.9	8	25.4	18.100
5"	330.2	44.4	185.7	266.7	8	28.6	30.500
6"	355.6	47.6	215.9	292.1	12	28.6	36.200
8"	419.1	55.6	269.9	349.2	12	31.7	56.500
10"	508.0	63.5	323.8	431.8	16	34.9	91.000
12"	558.8	66.7	381.0	488.9	20	34.9	105.000
14"	603.2	69.8	412.7	527.0	20	38.1	125.000
16"	685.8	76.2	469.9	603.2	20	41.3	178.000
18"	742.9	82.5	533.4	654.0	20	44.4	261.000
20"	812.8	88.9	584.2	723.9	24	44.4	268.000
22"	869.9	95.2	641.2	777.9	24	47.6	328.000
24"	939.8	101.6	692.1	838.2	24	50.8	380.000

ANSI / ASME B16.5 Class 600 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"	95.2	14.3	34.9	66.7	4	15.9	0.800
3/4"	117.5	15.9	42.9	82.5	4	19.0	1.400
1"	123.8	17.5	50.8	88.9	4	19.0	1.600
1 1/2"	155.6	22.2	73.0	114.3	4	22.2	3.100
2"	165.1	25.4	92.1	127.0	8	19.0	3.700
3"	209.5	31.7	127.0	168.3	8	22.2	7.300
4"	273.0	38.1	157.2	215.9	8	25.4	11.800
6"	355.6	47.6	215.9	292.1	12	28.6	29.500
8"	419.1	55.6	269.9	349.2	12	31.7	43.000
10"	508.0	63.5	323.8	431.8	16	34.9	70.000
12"	558.8	66.7	381.0	488.9	20	34.9	86.000
16"	685.8	76.2	469.9	603.2	20	41.3	142.000
20"	812.8	88.9	584.2	723.9	24	44.4	232.000
24"	939.8	101.6	692.1	838.2	24	50.8	330.000

ANSI / ASME B16.5 Class 600 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"	95.2	14.3	34.9	66.7	4	15.9	0.800
3/4"	117.5	15.9	42.9	82.5	4	19.0	1.400
1"	123.8	17.5	50.8	88.9	4	19.0	1.600
1 1/2"	155.6	22.2	73.0	114.3	4	22.2	3.100
2"	165.1	25.4	92.1	127.0	8	19.0	3.700
3"	209.5	31.7	127.0	168.3	8	22.2	7.300
4"	273.0	38.1	157.2	215.9	8	25.4	11.800
6"	355.6	47.6	215.9	292.1	12	28.6	29.500
8"	419.1	55.6	269.9	349.2	12	31.7	43.000
10"	508.0	63.5	323.8	431.8	16	34.9	70.000
12"	558.8	66.7	381.0	488.9	20	34.9	86.000
16"	685.8	76.2	469.9	603.2	20	41.3	142.000
20"	812.8	88.9	584.2	723.9	24	44.4	232.000
24"	939.8	101.6	692.1	838.2	24	50.8	330.000

ANSI / ASME B16.5 Class 600 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	22.2	73.0	114.3	4	22.2	3.200
2"	165.1	25.4	92.1	127.0	8	19.0	4.300
3"	209.5	31.7	127.0	168.3	8	22.2	8.000
4"	273.0	38.1	157.2	215.9	8	25.4	18.000
6"	355.6	47.6	215.9	292.1	12	28.6	35.500
8"	419.1	55.6	269.9	349.2	12	31.7	58.000
10"	508.0	63.5	323.8	431.8	16	34.9	98.000
12"	558.8	66.7	381.0	488.9	20	34.9	125.000
16"	685.8	76.2	469.9	603.2	20	41.3	215.000
20"	812.8	88.9	584.2	723.9	24	44.4	366.000
24"	939.8	101.6	692.1	838.2	24	50.8	532.000

ANSI / ASME B16.5 Class 600 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	4
1 1/2"	6.12	0.88	4.5	4	0.88	7
2"	6.5	1	5	8	0.75	9
3"	8.25	1.25	6.62	8	0.88	16
4"	10.75	1.5	8.5	8	1	37
6"	14	1.88	11.5	12	1.12	80
8"	16.5	2.19	13.75	12	1.25	115
10"	20	2.5	17	16	1.38	170
12"	22	2.62	19.25	20	1.38	200
16"	27	3	23.75	20	1.62	330
20"	32	3.5	28.5	24	1.75	510
24"	37	4	33	24	2	730

ANSI / ASME B16.5 Class 600 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	4
1 1/2"	6.12	0.88	4.5	4	0.88	7
2"	6.5	1	5	8	0.75	9
3"	8.25	1.25	6.62	8	0.88	15
4"	10.75	1.5	8.5	8	1	36
6"	14	1.88	11.5	12	1.12	78
8"	16.5	2.19	13.75	12	1.25	110
10"	20	2.5	17	16	1.38	170
12"	22	2.62	19.25	20	1.38	200
16"	27	3	23.75	20	1.62	365
20"	32	3.5	28.5	24	1.75	570
24"	37	4	33	24	2	810

ANSI / ASME B16.5 Class 600 threaded flange NPT dimensions

NPS	OD in	Flange thickness in	Face dia. in	Bolt circle in	Holes	Hole dia. in	Approx. kg
1/2"	3.75	0.56	1.38	2.62	4	0.62	0.74
3/4"	4.62	0.62	1.69	3.25	4	0.75	1.27
1"	4.88	0.69	2	3.5	4	0.75	1.52
1 1/2"	6.12	0.88	2.88	4.5	4	0.88	2.96
2"	6.5	1	3.62	5	8	0.75	3.62

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

Pressure service checks

For Class 400 and 600 orders, our review links pipe schedule or bore details with facing and inspection requirements.

Materials

We supply ASTM A105 / A105N, A350 LF2 and A182 stainless steel grades according to project service conditions.

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 400

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.

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

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