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EPDM Full Face Gasket

Full Face gaskets are a flat sealing element, consisting of an inner and outer diameter, and a specified number of bolt holes, the center of which are evenly spaced around a bolt circle. Full face gaskets are designed to fill the entire space between flat-faced flanges, with bolt holes that match the size and arrangement of the bolt holes in the intended flanges. ASME B16.21 and ASME B16.47 govern the dimensions of full face gaskets for standard and large diameter pipe flanges. EPDM, Ethylene Propylene Diene Monomer, is an "M" class synthetic rubber elastomer. Relatively immune to sunlight, water and low temperatures, EPDM is often a smart choice for gaskets that will be outside. Good compression set resistance means it recovers well in applications where a joint may open up from time to time, and high electrical resistance means EPDM gaskets may be appropriate for some electrical installations.

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Governing Standards
Physical Properties
Dimensional Specifications

Dimensional Specifications

Dimensional SpecificationsEPDM Full Face Gasket

Per ASME B16.21-2016
		Pipe Diameter
		1/2	3/4	1	1 1/4	1 1/2	2	2 1/2	3	3 1/2	4	5	6	8	10	12	14	16	18	20	24
Inside Diameter		0.84	1.06	1.31	1.66	1.91	2.38	2.88	3.50	4.00	4.50	5.56	6.62	8.62	10.75	12.75	14.00	16.00	18.00	20.00	24.00
Outside Diameter per Class	150#	3.50	3.88	4.25	4.63	5.00	6.00	7.00	7.50	8.50	9.00	10.00	11.00	13.50	16.00	19.00	21.00	23.50	25.00	27.50	32.00
	300#	3.75	4.62	4.88	5.25	6.12	6.50	7.50	8.25	9.00	10.00	11.00	12.50	15.00	17.50	20.50	23.00	25.50	28.00	30.50	36.00
	600#	3.75	4.62	4.88	5.25	6.12	6.50	7.50	8.25	9.00	10.75	13.00	14.00	16.50	20.00	22.00	23.75	27.00	29.25	32.00	37.00
Bolt Circle Diameter per Class	150#	2.38	2.75	3.13	3.50	3.88	4.75	5.50	6.00	7.00	7.50	8.50	9.50	11.75	14.25	17.00	18.75	21.25	22.75	25.00	29.50
	300#	2.62	3.25	3.50	3.88	4.50	5.00	5.88	6.62	7.25	7.88	9.25	10.62	13.00	15.25	17.75	20.25	22.50	24.75	27.00	32.00
	600#	2.62	3.25	3.50	3.88	4.50	5.00	5.88	6.62	7.25	8.50	10.50	11.50	13.75	17.00	19.25	20.75	23.75	25.75	28.50	33.00
Number of Bolt Holes per Class	150#	4	4	4	4	4	4	4	4	8	8	8	8	8	12	12	12	16	16	20	20
	300#	4	4	4	4	4	8	8	8	8	8	8	12	12	16	16	20	20	24	24	24
	600#	4	4	4	4	4	8	8	8	8	8	8	12	12	16	20	20	20	20	24	24
Bolt Hole Diameter per Class	150#	0.63	0.63	0.63	0.63	0.63	0.75	0.75	0.75	0.75	0.75	0.88	0.88	0.88	1.00	1.00	1.13	1.13	1.25	1.25	1.38
	300#	0.63	0.75	0.75	0.75	0.88	0.75	0.88	0.88	0.88	0.88	0.88	0.88	1.00	1.12	1.25	1.25	1.38	1.38	1.38	1.62
	600#	0.63	0.75	0.75	0.75	0.88	0.75	0.88	0.88	1.00	1.00	1.12	1.12	1.25	1.38	1.38	1.50	1.62	1.75	1.75	2.00

Per ASME B16.47-2017
Series A		Pipe Diameter
Series A		26	28	30	32	34	36	38	40	42	44	46	48	50	52	54	56	58	60
Inside Diameter		26.00	28.00	30.00	32.00	34.00	36.00	38.00	40.00	42.00	44.00	46.00	48.00	50.00	52.00	54.00	56.00	58.00	60.00
Outside Diameter per Class	150#	34.25	36.50	38.75	41.75	43.75	46.00	48.75	50.75	53.00	55.25	57.25	59.50	61.75	64.00	66.25	68.75	71.00	73.00
	300#	38.25	40.75	43.00	45.25	47.50	50.00	46.00	48.75	50.75	53.25	55.75	57.75	60.25	62.25	65.25	67.25	69.25	71.25
	600#	40.00	42.25	44.50	47.00	49.00	51.75	50.00	52.00	55.25	57.25	59.50	62.75	65.75	67.75	70.00	73.00	75.00	78.50
Bolt Circle Diameter per Class	150#	31.75	34.00	36.00	38.50	40.50	42.75	45.25	47.25	49.50	51.75	53.75	56.00	58.25	60.50	62.75	65.00	67.25	69.25
	300#	34.50	37.00	39.25	41.50	43.50	46.00	43.00	45.50	47.50	49.75	52.00	54.00	56.25	58.25	61.00	63.00	65.00	67.00
	600#	36.00	38.00	40.25	42.50	44.50	47.00	45.75	47.75	50.50	52.50	54.75	57.50	60.00	62.00	64.25	66.75	68.75	71.75
Number of Bolt Holes per Class	150#	24	28	28	28	32	32	32	36	36	40	40	44	44	44	44	48	48	52
	300#	28	28	28	28	28	32	32	32	32	32	28	32	32	32	28	28	32	32
	600#	28	28	28	28	28	28	28	32	28	32	32	32	28	32	32	32	32	28
Bolt Hole Diameter per Class	150#	1.38	1.38	1.38	1.63	1.63	1.63	1.63	1.63	1.63	1.63	1.63	1.63	1.88	1.88	1.88	1.88	1.88	1.88
	300#	1.75	1.75	1.88	2.00	2.00	2.12	1.62	1.75	1.75	1.88	2.00	2.00	2.12	2.12	2.38	2.38	2.38	2.38
	600#	2.00	2.12	2.12	2.38	2.38	2.62	2.38	2.38	2.62	2.62	2.62	2.88	3.12	3.12	3.12	3.38	3.38	3.62
Per ASME B16.47-2017
Series B		Pipe Diameter
Series B		26	28	30	32	34	36	38	40	42	44	46	48	50	52	54	56	58	60
Inside Diameter		26.00	28.00	30.00	32.00	34.00	36.00	38.00	40.00	42.00	44.00	46.00	48.00	50.00	52.00	54.00	56.00	58.00	60.00
Outside Diameter per Class	150#	30.94	32.94	34.94	37.06	39.56	41.62	44.25	46.25	48.25	50.25	52.81	54.81	56.81	58.81	61.00	63.00	65.94	67.94
	300#	34.12	36.25	39.00	41.50	43.62	46.12	48.12	50.12	52.50	54.50	57.50	59.50	61.50	63.50	65.88	69.50	71.94	73.94
	600#	35.00	37.50	40.25	42.75	45.75	47.75
Bolt Circle Diameter per Class	150#	29.31	31.31	33.31	35.44	37.69	39.75	42.12	44.12	46.12	48.12	50.56	52.56	54.56	56.56	58.75	60.75	63.44	65.44
	300#	31.62	33.75	36.25	38.50	40.62	42.88	44.88	46.88	49.00	51.00	53.75	55.75	57.75	59.75	62.12	65.00	67.44	69.44
	600#	31.75	34.00	36.50	38.75	41.50	43.50
Number of Bolt Holes per Class	150#	36	40	44	48	40	44	40	44	48	52	40	44	48	52	56	60	48	52
	300#	32	36	36	32	36	32	36	40	36	40	36	40	44	48	48	36	40	40
	600#	28	28	28	28	24	28
Bolt Hole Diameter per Class	150#	0.88	0.88	0.88	0.88	1.00	1.00	1.12	1.12	1.12	1.12	1.25	1.25	1.25	1.25	1.25	1.25	1.38	1.38
	300#	1.38	1.38	1.50	1.62	1.62	1.75	1.75	1.75	1.88	1.88	2.00	2.00	2.00	2.00	2.00	2.38	2.38	2.38
	600#	1.75	1.88	2.00	2.12	2.38	2.38

All dimensions are in inches.

EPDM Full Face Gasket

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Pipe Diameter Flange Rating Series Thickness Item # Availability Price Quantity UOM

1/2

150#

1/8

GFEPDM-1500050-1/8

1-3 Working Days

$1.29981/EA

See Quantity Discounts

1/2 150# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$1.29981/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$1.29981/ EA
170	$1.21312/ EA
680	$0.88829/ EA
2040	$0.64133/ EA

1/2

300#, 400#, 600#

1/8

GFEPDM-3460050-1/8

1-3 Working Days

$1.49213/EA

See Quantity Discounts

1/2 300#/400#/600# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$1.49213/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$1.49213/ EA
140	$1.39261/ EA
560	$1.01972/ EA
1680	$0.73622/ EA

3/4

150#

1/8

GFEPDM-1500075-1/8

1-3 Working Days

$1.59327/EA

See Quantity Discounts

3/4 150# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$1.59327/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$1.59327/ EA
140	$1.487/ EA
560	$1.08884/ EA
1680	$0.78612/ EA

3/4

300#, 400#, 600#

1/8

GFEPDM-3460075-1/8

1-3 Working Days

$2.2697/EA

See Quantity Discounts

3/4 300#/400#/600# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$2.2697/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$2.2697/ EA
100	$2.11831/ EA
400	$1.55111/ EA
1200	$1.11987/ EA

150#

1/8

GFEPDM-1500100-1/8

1-3 Working Days

$1.91656/EA

See Quantity Discounts

1 150# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$1.91656/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$1.91656/ EA
120	$1.78873/ EA
480	$1.30978/ EA
1440	$0.94563/ EA

300#, 400#, 600#

1/8

GFEPDM-3460100-1/8

1-3 Working Days

$2.5217/EA

See Quantity Discounts

1 300#/400#/600# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$2.5217/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$2.5217/ EA
90	$2.35351/ EA
360	$1.72333/ EA
1080	$1.24421/ EA

1 1/4

150#

1/8

GFEPDM-1500125-1/8

1-3 Working Days

$2.2697/EA

See Quantity Discounts

1 1/4 150# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$2.2697/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$2.2697/ EA
100	$2.11831/ EA
400	$1.55111/ EA
1200	$1.11987/ EA

1 1/4

300#, 400#, 600#

1/8

GFEPDM-3460125-1/8

1-3 Working Days

$2.92458/EA

See Quantity Discounts

1 1/4 300#/400#/600# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$2.92458/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$2.92458/ EA
80	$2.72951/ EA
320	$1.99866/ EA
960	$1.44299/ EA

1 1/2

150#

1/8

GFEPDM-1500150-1/8

1-3 Working Days

$2.65268/EA

See Quantity Discounts

1 1/2 150# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$2.65268/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$2.65268/ EA
90	$2.47575/ EA
360	$1.81284/ EA
1080	$1.30883/ EA

1 1/2

300#, 400#, 600#

1/8

GFEPDM-3460150-1/8

1-3 Working Days

$3.98068/EA

See Quantity Discounts

1 1/2 300#/400#/600# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$3.98068/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$3.98068/ EA
60	$3.71517/ EA
240	$2.7204/ EA
720	$1.96407/ EA

150#

1/8

GFEPDM-1500200-1/8

1-3 Working Days

$3.81986/EA

See Quantity Discounts

2 150# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$3.81986/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$3.81986/ EA
70	$3.56508/ EA
280	$2.61049/ EA
840	$1.88472/ EA

300#, 400#, 600#

1/8

GFEPDM-3460200-1/8

1-3 Working Days

$4.48303/EA

See Quantity Discounts

2 300#/400#/600# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$4.48303/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$4.48303/ EA
60	$4.18401/ EA
240	$3.0637/ EA
720	$2.21193/ EA

2 1/2

150#

1/8

GFEPDM-1500250-1/8

1-3 Working Days

$5.19925/EA

See Quantity Discounts

2 1/2 150# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$5.19925/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$5.19925/ EA
50	$4.85246/ EA
200	$3.55317/ EA
600	$2.56531/ EA

150#

1/8

GFEPDM-1500300-1/8

1-3 Working Days

$4.66872/EA

See Quantity Discounts

3 150# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$4.66872/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$4.66872/ EA
50	$4.35731/ EA
200	$3.1906/ EA
600	$2.30355/ EA

300#, 400#, 600#

1/8

GFEPDM-3460300-1/8

1-3 Working Days

$5.92211/EA

See Quantity Discounts

3 300#/400#/600# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$5.92211/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$5.92211/ EA
40	$5.5271/ EA
160	$4.04717/ EA
480	$2.92197/ EA

150#

1/8

GFEPDM-1500400-1/8

1-3 Working Days

$6.44601/EA

See Quantity Discounts

4 150# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$6.44601/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$6.44601/ EA
40	$6.01606/ EA
160	$4.40521/ EA
480	$3.18046/ EA

300#

1/8

GFEPDM-3000400-1/8

1-3 Working Days

$8.46205/EA

See Quantity Discounts

4 300# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$8.46205/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$8.46205/ EA
25	$7.89763/ EA
100	$5.78297/ EA
300	$4.17518/ EA

150#

1/8

GFEPDM-1500500-1/8

1-3 Working Days

$7.32761/EA

See Quantity Discounts

5 150# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$7.32761/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$7.32761/ EA
30	$6.83886/ EA
120	$5.00769/ EA
360	$3.61545/ EA

150#

1/8

GFEPDM-1500600-1/8

1-3 Working Days

$8.18186/EA

See Quantity Discounts

6 150# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$8.18186/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$8.18186/ EA
25	$7.63613/ EA
100	$5.59148/ EA
300	$4.03693/ EA

300#

1/8

GFEPDM-3000600-1/8

1-3 Working Days

$11.92214/EA

See Quantity Discounts

6 300# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$11.92214/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$11.92214/ EA
25	$11.12693/ EA
100	$8.14759/ EA
300	$5.88238/ EA

150#

1/8

GFEPDM-1500800-1/8

1-3 Working Days

$11.44466/EA

See Quantity Discounts

8 150# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$11.44466/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$11.44466/ EA
25	$10.6813/ EA
100	$7.82128/ EA
300	$5.64679/ EA

300#

1/8

GFEPDM-3000800-1/8

1-3 Working Days

$15.98074/EA

See Quantity Discounts

8 300# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$15.98074/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$15.98074/ EA
25	$14.91483/ EA
100	$10.92124/ EA
300	$7.8849/ EA

150#

1/8

GFEPDM-1501000-1/8

1-3 Working Days

$14.90143/EA

See Quantity Discounts

10 150# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$14.90143/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$14.90143/ EA
25	$13.90751/ EA
100	$10.18364/ EA
300	$7.35237/ EA

300#

1/8

GFEPDM-3001000-1/8

1-3 Working Days

$20.23332/EA

See Quantity Discounts

10 300# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$20.23332/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$20.23332/ EA
40	$18.88376/ EA
160	$13.82745/ EA
480	$9.98312/ EA

150#

1/8

GFEPDM-1501200-1/8

1-3 Working Days

$21.05565/EA

See Quantity Discounts

12 150# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$21.05565/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$21.05565/ EA
40	$19.65124/ EA
160	$14.38943/ EA
480	$10.38886/ EA

300#

1/8

GFEPDM-3001200-1/8

1-3 Working Days

$27.3425/EA

See Quantity Discounts

12 300# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$27.3425/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$27.3425/ EA
30	$25.51876/ EA
120	$18.68587/ EA
360	$13.49079/ EA

150#

1/8

GFEPDM-1501400-1/8

1-3 Working Days

$25.99627/EA

See Quantity Discounts

14 150# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$25.99627/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$25.99627/ EA
40	$24.26232/ EA
160	$17.76585/ EA
480	$12.82656/ EA

300#

1/8

GFEPDM-3001400-1/8

1-3 Working Days

$35.3337/EA

See Quantity Discounts

14 300# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$35.3337/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$35.3337/ EA
30	$32.97694/ EA
120	$24.14705/ EA
360	$17.43365/ EA

150#

1/8

GFEPDM-1501600-1/8

1-3 Working Days

$31.43426/EA

See Quantity Discounts

16 150# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$31.43426/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$31.43426/ EA
30	$29.3376/ EA
120	$21.48217/ EA
360	$15.50966/ EA

300#

1/8

GFEPDM-3001600-1/8

1-3 Working Days

$41.83277/EA

See Quantity Discounts

16 300# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$41.83277/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$41.83277/ EA
20	$39.04252/ EA
80	$28.58851/ EA
240	$20.64029/ EA

150#

1/8

GFEPDM-1501800-1/8

1-3 Working Days

$31.93827/EA

See Quantity Discounts

18 150# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$31.93827/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$31.93827/ EA
30	$29.80799/ EA
120	$21.82661/ EA
360	$15.75834/ EA

300#

1/8

GFEPDM-3001800-1/8

1-3 Working Days

$48.80932/EA

See Quantity Discounts

18 300# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$48.80932/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$48.80932/ EA
20	$45.55374/ EA
80	$33.35629/ EA
240	$24.08252/ EA

150#

1/8

GFEPDM-1502000-1/8

1-3 Working Days

$37.80069/EA

See Quantity Discounts

20 150# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$37.80069/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$37.80069/ EA
30	$35.27939/ EA
120	$25.83299/ EA
360	$18.65086/ EA

300#

1/8

GFEPDM-3002000-1/8

1-3 Working Days

$56.26335/EA

See Quantity Discounts

20 300# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$56.26335/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$56.26335/ EA
20	$52.51058/ EA
80	$38.45037/ EA
240	$27.76034/ EA

150#

1/8

GFEPDM-1502400-1/8

1-3 Working Days

$47.53603/EA

See Quantity Discounts

24 150# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$47.53603/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$47.53603/ EA
20	$44.36538/ EA
80	$32.48612/ EA
240	$23.45428/ EA

300#

1/8

GFEPDM-3002400-1/8

1-3 Working Days

$76.39719/EA

See Quantity Discounts

24 300# 1/8 EPDM 70 DUROMETER +/- 5 FULL FACE GASKET

$76.39719/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$76.39719/ EA
20	$71.3015/ EA
80	$52.20984/ EA
240	$37.69438/ EA

Typical Physical Properties:
Dimension			1/8"
Hardness (shore A)			65
Density (g/cm3)			1.40
Tensile Strength (mpa)			4.50
Elongation (%)			300
Temperature			-4F to 284F (-20C to 140C)

ASME B16.21	Covers types, sizes, materials, dimensions, tolerances, and markings for nonmetallic flat gaskets.
ASME B16.47	Covers pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing for pipe flanges in sizes NPS 26 through NPS 60. Included are flanges with rating class designations 75, 150, 300, 400, 600, and 900 with requirements given in both SI (Metric) and U. S. Customary units, with diameter of bolts and flange bolt hole expressed in inch units.