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Graflex 2661/1661 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. Teadit 2661/1661 flexible graphite sheet has pressure-temperature sealability capabilities that are far superior to all compressed fiber reinforced sheet materials. It is resistant to chemical attack by virtually all organic and inorganic fluids with the exception of concentrated, highly oxidizing acids. Gaskets cut from 2661/1661 flexible graphite sheet seal with low to moderate bolt loads and because of very low creep relaxation, re-torquing is rarely required. Flexible graphite conforms to irregular flange sealing surfaces and readily flows into flange irregularities enabling it to seal both smooth and coarse surface finishes. 2661/1661 is a flexible graphite sheet reinforced with a 316SS foil, .002" thick. The flexible graphite sheet is made from exfoliated graphite flake which is compressed into foil by a carefully controlled calendaring process. In this process, the expanded flake particles are mechanically locked together without the use of fibers, binders or other additives. Sheets of graphite foil are then adhesive bonded and laminated to the required thickness with the 316SS foil core in the center.

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Governing Standards
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Physical Properties
Dimensional Specifications

Dimensional Specifications

Dimensional SpecificationsGraflex 2661/1661 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.

Graflex 2661/1661 Ring Gasket

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

1 1/2

150#

1/8

GR2661-1500150-1/8

In Stock

$2.71536/EA

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1 1/2 150# 1/8 GRAFLEX 2661/1661 WITH 316 FOIL INSERT RING GASKET

$2.71536/EA

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In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.71536/ EA
500	$2.53425/ EA
2000	$1.85568/ EA
6000	$1.33976/ EA

1 1/2

150#

1/16

GR2661-1500150

In Stock

$2.08418/EA

See Quantity Discounts

1 1/2 150# 1/16 GRAFLEX 2661/1661 WITH 316 FOIL INSERT RING GASKET

$2.08418/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.08418/ EA
990	$1.94516/ EA
3960	$1.42433/ EA
11880	$1.02833/ EA

Temperature	Continuous Service: -328F (-200C)
	Maximum Service:
	In air: 842F (450C)
	In steam: 1202F (650C)
	In reducing or inert media: 5432F (3000C)

Typical Physical Properties:
Density		62.4 lbs/ft^3
Compressibility - Tested under 5000 psi		35%
Recovery - Tested under 5000 psi		18%
Tensile Strength Across Grain		5000 psi
Creep Relaxation		12%
Compressive Strength		24,000psi
Carbon Content		98% minimum
Total Sulfur		≤750 ppm maximum
Leachable Chlorides		<30 ppm maximum

Graflex 2661/1661 Ring Gasket

Technical Data

Governing Standards

Governing StandardsGraflex 2661/1661 Ring Gasket

Service Limits

Service LimitsGraflex 2661/1661 Ring Gasket

Physical Properties

Physical PropertiesGraflex 2661/1661 Ring Gasket

Dimensional Specifications

Dimensional SpecificationsGraflex 2661/1661 Ring Gasket

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1 1/2 150# 1/8 GRAFLEX 2661/1661 WITH 316 FOIL INSERT RING GASKET

1 1/2 150# 1/16 GRAFLEX 2661/1661 WITH 316 FOIL INSERT 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.