ASME B16.5FlangesTG-DS-084 · Rev. 0 · October 2026

ASME B16.5 Plate Flange & Blind Flange Dimensions

This chart gives ASME B16.5 plate flange and blind flange dimensions in millimetres for Class 150, 300, 400, 600, 900 and 1500 — outside diameter, bore, plate and blind thickness for raised-face and flat-face flanges, bolt circle, bolt holes and raised face. A plate flange drilled to ASME B16.5 is a hubless alternative to the forged slip-on flange for low-pressure service.

Plate flanges are Teshi Group's core product: cut, machined and drilled in our own works in India from DN 10 up to 8000 NB (8 metres), in carbon, boiler-quality, stainless, duplex and nickel-alloy plate, with EN 10204 3.1 certificates.

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Key to dimensions

D: Outside diameter of flange
B: Bore (inside diameter) of plate flange
C: Flange thickness — plate or blind, raised face (RF) or flat face (FF)
K: Bolt circle (pitch circle) diameter
n: Number of bolt holes
L: Bolt hole diameter
d1: Raised face diameter
f: Raised face height

ASME B16.5 Plate Flange & Blind Flange Dimensions — tables

ASME B16.5 Class 150 — plate and blind flange (mm)

Find a size

ASME B16.5 Class 150 — plate and blind flange (mm)
SizeNB	DFlange OD · mm	KBolt circle · mm	nBolts	LHole dia · mm	d1Raised face · mm	fRF height · mm	BBore · mm	CPlate, RF · mm	CPlate, FF · mm	CBlind, RF · mm	CBlind, FF · mm
15	88.9	60.3	4	15.9	34.9	1.6	22.35	11.1	9.5	11.1	9.5
20	98.4	69.9	4	15.9	42.9	1.6	27.7	12.7	11.1	12.7	11.1
25	107.9	79.4	4	15.9	50.8	1.6	34.5	14.3	12.7	14.3	12.7
32	117.5	88.9	4	15.9	63.5	1.6	43.2	15.9	14.3	15.9	14.3
40	127	98.4	4	15.9	73	1.6	49.5	17.5	15.9	17.5	15.9
50	152.4	120.7	4	19.1	92.1	1.6	62	19.1	17.5	19.1	17.5
65	177.8	139.7	4	19.1	104.8	1.6	74.7	22.2	20.6	22.2	20.6
80	190.5	152.4	4	19.1	127	1.6	90.7	23.8	22.2	23.8	22.2
90	215.9	177.8	8	19.1	139.7	1.6	103.5	23.8	22.2	23.8	22.2
100	228.6	190.5	8	19.1	157.2	1.6	116	23.8	22.2	23.8	22.2
125	254	215.9	8	22.2	185.7	1.6	143.8	23.8	22.2	23.8	22.2
150	279.4	241.3	8	22.2	215.9	1.6	170.5	25.4	23.8	25.4	23.8
200	342.9	298.5	8	22.2	269.9	1.6	221.5	28.6	27	28.6	27
250	406.4	362	12	25.4	323.8	1.6	276.4	30.2	28.6	30.2	28.6
300	482.6	431.8	12	25.4	381	1.6	327.2	31.8	30.2	31.8	30.2
350	533.4	476.3	12	28.6	412.8	1.6	359.2	34.9	33.3	34.9	33.3
400	596.9	539.8	16	28.6	469.9	1.6	410.5	36.5	34.9	36.5	34.9
450	635	577.9	16	31.8	533.4	1.6	461.8	39.7	38.1	39.7	38.1
500	698.5	635	20	31.8	584.2	1.6	513.1	42.9	41.3	42.9	41.3
600	812.8	749.3	20	34.9	692.2	1.6	616	47.6	46	47.6	46

ASME B16.5 Class 300 — plate and blind flange (mm)

ASME B16.5 Class 300 — plate and blind flange (mm)
SizeNB	DFlange OD · mm	KBolt circle · mm	nBolts	LHole dia · mm	d1Raised face · mm	fRF height · mm	BBore · mm	CPlate, RF · mm	CPlate, FF · mm	CBlind, RF · mm	CBlind, FF · mm
15	95.2	66.7	4	15.9	34.9	1.6	22.35	14.3	12.7	14.3	12.7
20	117.5	82.6	4	19.1	42.9	1.6	27.7	15.9	14.3	15.9	14.3
25	123.8	88.9	4	19.1	50.8	1.6	34.5	17.5	15.9	17.5	15.9
32	133.3	98.4	4	19.1	63.5	1.6	43.2	19	17.4	19	17.4
40	155.6	114.3	4	22.2	73	1.6	49.5	20.6	19	20.6	19
50	165.1	127	8	19.1	92.1	1.6	62	22.2	20.6	22.2	20.6
65	190.5	149.2	8	22.2	104.8	1.6	74.7	25.4	23.8	25.4	23.8
80	209.5	168.3	8	22.2	127	1.6	90.7	28.6	27	28.6	27
90	228.6	184.2	8	22.2	139.7	1.6	103.5	30.2	28.6	30.2	28.6
100	254	200	8	22.2	157.2	1.6	116	31.8	30.2	31.8	30.2
125	279.4	235	8	22.2	185.7	1.6	143.8	34.9	33.3	34.9	33.3
150	317.5	269.9	12	22.2	215.9	1.6	170.5	36.5	34.9	36.5	34.9
200	381	330.2	12	25.4	269.9	1.6	221.5	41.3	39.7	41.3	39.7
250	444.5	387.4	16	28.6	323.8	1.6	276.4	47.6	46	47.6	46
300	520.7	450.8	16	31.8	381	1.6	327.2	50.8	49.2	50.8	49.2
350	584.2	514.4	20	31.8	412.8	1.6	359.2	54	52.4	54	52.4
400	647.7	571.5	20	34.9	469.9	1.6	410.5	57.2	55.6	57.2	55.6
450	711.2	628.6	24	34.9	533.4	1.6	461.8	60.3	58.7	60.3	58.7
500	774.7	685.8	24	34.9	584.2	1.6	513.1	63.5	61.9	63.5	61.9
600	914.4	812.8	24	41.3	692.2	1.6	616	69.9	68.3	69.9	68.3

ASME B16.5 Class 400 — plate and blind flange (mm)

ASME B16.5 Class 400 — plate and blind flange (mm)
SizeNB	DFlange OD · mm	KBolt circle · mm	nBolts	LHole dia · mm	d1Raised face · mm	fRF height · mm	BBore · mm	CPlate, RF · mm	CPlate, FF · mm	CBlind, RF · mm	CBlind, FF · mm
15	95	66.7	4	15.9	34.9	6.4	22.2	20.7	14.3	20.7	14.3
20	115	82.6	4	19.1	42.9	6.4	27.7	22.3	15.9	22.3	15.9
25	125	88.9	4	19.1	50.8	6.4	34.5	23.9	17.5	23.9	17.5
32	135	98.4	4	19.1	63.5	6.4	43.2	27.1	20.7	27.1	20.7
40	155	114.3	4	22.2	73	6.4	49.5	28.7	22.3	28.7	22.3
50	165	127	8	19.1	92.1	6.4	61.9	31.8	25.4	31.8	25.4
65	190	149.2	8	22.2	104.8	6.4	74.6	35	28.6	35	28.6
80	210	168.3	8	22.2	127	6.4	90.7	38.2	31.8	38.2	31.8
100	255	200	8	25.4	157.2	6.4	116.1	41.4	35	41.4	35
125	280	235	8	25.4	185.7	6.4	143.8	44.5	38.1	44.5	38.1
150	320	269.9	12	25.4	215.9	6.4	170.7	47.7	41.3	47.7	41.3
200	380	330	12	28.6	269.9	6.4	221.5	54.1	47.7	54.1	47.7
250	445	387.4	16	31.8	323.8	6.4	276.2	60.4	54	60.4	54
300	520	450.8	16	34.9	381	6.4	327	63.6	57.2	63.6	57.2
350	585	514.4	20	34.9	412.8	6.4	359.2	66.8	60.4	66.8	60.4
400	650	571.5	20	38.1	469.9	6.4	410.5	69.9	63.5	69.9	63.5
450	710	628.6	24	38.1	533.4	6.4	461.8	73.1	66.7	73.1	66.7
500	775	685.8	24	44.5	584.2	6.4	513.1	76.3	69.9	76.3	69.9
600	915	812.8	24	47.6	692.2	6.4	616	82.6	76.2	82.6	76.2

ASME B16.5 Class 600 — plate and blind flange (mm)

ASME B16.5 Class 600 — plate and blind flange (mm)
SizeNB	DFlange OD · mm	KBolt circle · mm	nBolts	LHole dia · mm	d1Raised face · mm	fRF height · mm	BBore · mm	CPlate, RF · mm	CPlate, FF · mm	CBlind, RF · mm	CBlind, FF · mm
15	95	66.7	4	15.9	34.9	6.4	22.2	20.7	14.3	20.7	14.3
20	115	82.6	4	19.1	42.9	6.4	27.7	22.3	15.9	22.3	15.9
25	125	88.9	4	19.1	50.8	6.4	34.5	23.9	17.5	23.9	17.5
32	135	98.4	4	19.1	63.5	6.4	43.2	27.1	20.7	27.1	20.7
40	155	114.3	4	22.2	73	6.4	49.5	28.7	22.3	28.7	22.3
50	165	127	8	19.1	92.1	6.4	61.9	31.8	25.4	31.8	25.4
65	190	149.2	8	22.2	104.8	6.4	74.6	35	28.6	35	28.6
80	210	168.3	8	22.2	127	6.4	90.7	38.2	31.8	38.2	31.8
100	275	215.9	8	25.4	157.2	6.4	116.1	44.5	38.1	44.5	38.1
125	330	266.7	8	28.6	185.7	6.4	143.8	50.9	44.5	50.9	44.5
150	355	292.1	12	28.6	215.9	6.4	170.7	54.1	47.7	54.1	47.7
200	420	349.2	12	31.8	269.9	6.4	221.5	62	55.6	62	55.6
250	510	431.8	16	34.9	323.8	6.4	276.2	69.9	63.5	69.9	63.5
300	560	489	20	34.9	381	6.4	327	73.1	66.7	73.1	66.7
350	605	527	20	38.1	412.8	6.4	359.2	76.3	69.9	76.3	69.9
400	685	603.2	20	41.3	469.9	6.4	410.5	82.6	76.2	82.6	76.2
450	745	654	20	44.5	533.4	6.4	461.8	89	82.6	89	82.6
500	815	723.9	24	44.5	584.2	6.4	513.1	95.3	88.9	95.3	88.9
600	940	838.2	24	50.8	692.2	6.4	616	108	101.6	108	101.6

ASME B16.5 Class 900 — plate and blind flange (mm)

ASME B16.5 Class 900 — plate and blind flange (mm)
SizeNB	DFlange OD · mm	KBolt circle · mm	nBolts	LHole dia · mm	d1Raised face · mm	fRF height · mm	BBore · mm	CPlate, RF · mm	CPlate, FF · mm	CBlind, RF · mm	CBlind, FF · mm
15	120	82.6	4	22.2	34.9	6.4	22.2	28.7	22.3	28.7	22.3
20	130	88.9	4	22.2	42.9	6.4	27.7	31.8	25.4	31.8	25.4
25	150	101.6	4	25.4	50.8	6.4	34.5	35	28.6	35	28.6
32	160	111.1	4	25.4	63.5	6.4	43.2	35	28.6	35	28.6
40	180	123.8	4	28.6	73	6.4	49.5	38.2	31.8	38.2	31.8
50	215	165.1	8	25.4	92.1	6.4	61.9	44.5	38.1	44.5	38.1
65	245	190.5	8	28.6	104.8	6.4	74.6	47.7	41.3	47.7	41.3
80	240	190.5	8	25.4	127	6.4	90.7	44.5	38.1	44.5	38.1
100	290	235	8	31.8	157.2	6.4	116.1	50.9	44.5	50.9	44.5
125	350	279.4	8	34.9	185.7	6.4	143.8	57.2	50.8	57.2	50.8
150	380	317.5	12	31.8	215.9	6.4	170.7	62	55.6	62	55.6
200	470	393.7	12	38.1	269.9	6.4	221.5	69.9	63.5	69.9	63.5
250	545	469.9	16	38.1	323.8	6.4	276.2	76.3	69.9	76.3	69.9
300	610	533.4	20	38.1	381	6.4	327	85.8	79.4	85.8	79.4
350	640	558.8	20	41.3	412.8	6.4	359.2	92.2	85.8	92.2	85.8
400	705	616	20	44.5	469.9	6.4	410.5	95.3	88.9	95.3	88.9
450	785	685.8	20	50.8	533.4	6.4	461.8	108	101.6	108	101.6
500	855	749.3	20	54	584.2	6.4	513.1	114.4	108	114.4	108
600	1040	901.7	20	66.7	692.2	6.4	616	146.1	139.7	146.1	139.7

ASME B16.5 Class 1500 — plate and blind flange (mm)

ASME B16.5 Class 1500 — plate and blind flange (mm)
SizeNB	DFlange OD · mm	KBolt circle · mm	nBolts	LHole dia · mm	d1Raised face · mm	fRF height · mm	BBore · mm	CPlate, RF · mm	CPlate, FF · mm	CBlind, RF · mm	CBlind, FF · mm
15	120	82.6	4	22.2	34.9	6.4	22.2	28.7	22.3	28.7	22.3
20	130	88.9	4	22.2	42.9	6.4	27.7	31.8	25.4	31.8	25.4
25	150	101.6	4	25.4	50.8	6.4	34.5	35	28.6	35	28.6
32	160	111.1	4	25.4	63.5	6.4	43.2	35	28.6	35	28.6
40	180	123.8	4	28.6	73	6.4	49.5	38.2	31.8	38.2	31.8
50	215	165.1	8	25.4	92.1	6.4	61.9	44.5	38.1	44.5	38.1
65	245	190.5	8	28.6	104.8	6.4	74.6	47.7	41.3	47.7	41.3

Notes

All dimensions are in millimetres; sizes are nominal bore (NB / DN).
Plate flange thickness is given for raised-face (RF) and flat-face (FF) flanges; where only RF is shown, the FF thickness is the same.
Reference values for estimation and checking. Verify against the current edition of the standard and the purchase specification before design, purchase or fabrication.

Reference information compiled from the published standard for convenience. It does not replace the current edition of the governing standard, which takes precedence. Verify critical dimensions and properties before design, purchase or fabrication. Teshi Engineers & Sales Promoters (P) Ltd accepts no liability for errors or omissions.

FAQ

ASME B16.5 Plate Flange & Blind Flange dimensions: common questions

What is the thickness of a 6 inch Class 150 plate flange?

In this table a 150 NB (6 inch) ASME B16.5 Class 150 plate flange is 25.4 mm thick with a raised face, on a 279.4 mm OD.

Is a plate flange the same as a slip-on flange?

No. A slip-on flange to ASME B16.5 is forged with a hub; a plate flange is a flat ring cut from plate with the same OD and drilling, so it bolts to a B16.5 flange but has no hub. Use it only where the specification allows a plate flange.

Does Teshi Group make ASME plate flanges?

Yes — plate and blind flanges drilled to ASME B16.5 in every class, in carbon, stainless, duplex and nickel-alloy plate, alongside forged B16.5 flanges.

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