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Red Rubber Ring Gasket

Ring gaskets are a flat sealing element, consisting of an inner and outer diameter sized to fit a flange's bore and bolt circle. Ring gaskets sit inside the flange's bolt circle. ASME B16.21 and ASME B16.47 govern the dimensions of ring gaskets for standard and large diameter pipe flanges. 75 durometer SBR rubber is a synthetic polymer, commonly known as "Red Rubber". SBR is a copolymer of styrene and butadiene and has properties similar to natural rubber. It is a widely used because it is inexpensive and has the ability to deform to uneven flange edges. SBR has excellent impact-strength, abrasion resistance, heat resistance, and sustains flexibility at lower temperatures. Even though SBR is not resistant to oil, gasoline, and hydrocarbon solvents, it performs well in industrial applications which involve contact with chemicals, water, air and steam.

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Governing Standards
Physical Properties
Dimensional Specifications

Dimensional Specifications

Dimensional SpecificationsRed Rubber Ring 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	2.38	2.38	2.88	3.50	4.00	4.50	5.56	6.63	8.63	10.75	12.75	14.00	16.00	18.00	20.00	24.00
Outside Diameter per Class	150#	1.88	2.25	2.62	3.00	3.38	4.12	4.88	5.38	6.38	6.88	7.75	8.75	11.00	13.38	16.13	17.75	20.25	21.62	23.88	28.25
	300#	2.12	2.62	2.88	3.25	3.75	4.38	5.12	5.88	6.50	7.12	8.50	9.88	12.12	14.25	16.62	19.12	21.25	23.50	25.75	30.50
	600#	2.12	2.62	2.88	3.25	3.75	4.38	5.12	5.88	6.38	7.62	9.50	10.50	12.62	15.75	18.00	19.38	22.25	24.12	26.88	31.12

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#	30.50	32.75	34.75	37.00	39.00	41.25	43.75	45.75	48.00	50.25	52.25	54.50	56.50	58.75	61.00	63.25	65.50	67.50
	300#	32.88	35.38	37.50	39.62	41.62	44.00	41.50	43.88	45.88	48.00	50.12	52.12	54.25	56.25	58.75	60.75	62.75	64.75
	600#	34.12	36.00	38.25	40.25	42.25	44.50	43.50	45.50	48.00	50.00	52.26	54.75	57.00	59.00	61.25	63.50	65.50	67.75
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#	28.56	30.56	32.56	34.69	36.81	38.88	41.12	43.12	45.12	47.12	49.44	51.44	53.44	55.44	57.62	59.62	62.19	64.19
	300#	30.38	32.50	34.88	37.00	39.12	41.25	43.25	45.25	47.25	49.25	51.88	53.88	55.88	57.88	61.25	62.75	65.19	67.12
	600#	30.12	32.25	34.62	36.75	39.25	41.25

All dimensions are in inches.

Red Rubber Ring Gasket

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

150#

1/8

GR100R-1501800-1/8

1-3 Working Days

$12.1028/EA

See Quantity Discounts

18 150# 1/8 RED RUBBER 75 DUROMETER +/- 5 RING GASKET

$12.1028/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$12.1028/ EA
25	$11.29555/ EA
100	$8.27105/ EA
300	$5.97152/ EA

300#

1/8

GR100R-3001800-1/8

1-3 Working Days

$22.50118/EA

See Quantity Discounts

18 300# 1/8 RED RUBBER 75 DUROMETER +/- 5 RING GASKET

$22.50118/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$22.50118/ EA
25	$21.00035/ EA
100	$15.37731/ EA
300	$11.10208/ EA

150#

1/16

GR100R-1501800

1-3 Working Days

$4.86346/EA

See Quantity Discounts

18 150# 1/16 RED RUBBER 75 DUROMETER +/- 5 RING GASKET

$4.86346/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$4.86346/ EA
40	$4.53907/ EA
160	$3.32369/ EA
480	$2.39963/ EA

300#

1/16

GR100R-3001800

1-3 Working Days

$9.042/EA

See Quantity Discounts

18 300# 1/16 RED RUBBER 75 DUROMETER +/- 5 RING GASKET

$9.042/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$9.042/ EA
25	$8.4389/ EA
100	$6.1793/ EA
300	$4.46132/ EA

Typical Physical Properties:
Dimension			1/8"
Hardness (shore A)			75 +/- 5
Density (g/cm3)			1.70
Tensile Strength (mpa)			2.50
Elongation (%)			180
Temperature			-22F to 212F (-30C to 100C)

Red Rubber Ring Gasket

Technical Data

Governing Standards

Governing StandardsRed Rubber Ring Gasket

Physical Properties

Physical PropertiesRed Rubber Ring Gasket

Dimensional Specifications

Dimensional SpecificationsRed Rubber Ring Gasket

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Pipe Diameter

Flange Rating

Thickness

Outside Diameter

18 150# 1/8 RED RUBBER 75 DUROMETER +/- 5 RING GASKET

18 300# 1/8 RED RUBBER 75 DUROMETER +/- 5 RING GASKET

18 150# 1/16 RED RUBBER 75 DUROMETER +/- 5 RING GASKET

18 300# 1/16 RED RUBBER 75 DUROMETER +/- 5 RING GASKET

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.