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316 SS Spiral Wound FG, CS OR

Spiral wound gaskets listed below consist of 316 stainless steel winding with flexible graphite filler, and a carbon steel outer ring. Spiral wound gaskets are metallic gaskets consisting of an outer centering ring (also known as OCR, OR, or an outer guide ring), metallic windings with a soft filler material, and a solid inner ring, or any combination of the three. These gaskets are manufactured to meet specifications as outlined in ASME B16.20 (previously covered by API 601). Spiral-wound gaskets can handle more harsh and varied operating conditions than non-asbestos sheet gaskets in general. They are available in multiple materials and configurations.

Products
Governing Standards
Color Codes
Dimensional Specifications

Color Codes

Color CodesSpiral Wound Gasket

Spiral wound gaskets shall be marked with a color code that identifies the windings and filler materials. A continuous color around the outer edge of the centering ring shall identify the winding metal. The color identifying the filler material for NPS 1 1/2 and larger shall have four intermittent stripes spaced approximately 90 deg apart on the outer edge of the centering ring. Smaller size gaskets shall have a minimum of two stripes 180 deg apart. The colors shall conform to those listed in the table below.

Per ASME B16.20-2007
Metallic Winding Materials	OD Color Code
Carbon Steel	Silver
304 Stainless Steel	Yellow
316L Stainless Steel	Green
317L Stainless Steel	Maroon
321 Stainless Steel	Turquoise
347 Stainless Steel	Blue
Monel 400	Orange
Nickel 200	Red
Titanium	Purple
20Cb-3 Alloy	Black
Hastelloy B	Brown
Hastelloy C	Beige
Inconel 600	Gold
Incoloy 800	White

Per ASME B16.20-2007
Nonmetallic Filler Materials	Color Code
Polytetrafluoroethylene	White Stripe
Mica-Graphite	Pink Stripe
Flexible Graphite	Gray Stripe
Ceramic	Light Green Stripe

Dimensional Specifications

Dimensional SpecificationsSpiral Wound Gasket

Per ASME B16.20-2017
		Pipe Diameter
		1/2	3/4	1	1 1/4	1 1/2	2	2 1/2	3	4	5	6	8	10	12	14	16	18	20	24
Inner Ring ID per Class	150#	0.56	0.81	1.06	1.50	1.75	2.19	2.62	3.19	4.19	5.19	6.19	8.50	10.56	12.50	13.75	15.75	17.69	19.69	23.75
	300#	0.56	0.81	1.06	1.50	1.75	2.19	2.62	3.19	4.19	5.19	6.19	8.50	10.56	12.50	13.75	15.75	17.69	19.69	23.75
	600#	0.56	0.81	1.06	1.50	1.75	2.19	2.62	3.19	4.04	5.05	6.10	8.10	10.05	12.10	13.50	15.35	17.25	19.25	23.25
	900#	0.56	0.81	1.06	1.31	1.63	2.06	2.50	3.10	4.05	5.05	6.10	7.75	9.69	11.50	12.63	14.75	16.75	19.00	23.25
	1500#	0.56	0.81	1.06	1.31	1.63	2.06	2.50	3.10	3.85	4.90	5.80	7.75	9.69	11.50	12.63	14.50	16.75	18.75	22.75
	2500#	0.56	0.81	1.06	1.31	1.63	2.06	2.50	3.10	3.85	4.90	5.80	7.75	9.69	11.50
Winding ID per Class	150#	0.75	1.00	1.25	1.88	2.13	2.75	3.25	4.00	5.00	6.13	7.19	9.19	11.31	13.38	14.63	16.63	18.69	20.69	24.75
	300#	0.75	1.00	1.25	1.88	2.13	2.75	3.25	4.00	5.00	6.13	7.19	9.19	11.31	13.38	14.63	16.63	18.69	20.69	24.75
	600#	0.75	1.00	1.25	1.88	2.13	2.75	3.25	4.00	4.75	5.81	6.88	8.88	10.81	12.88	14.25	16.25	18.50	20.50	24.75
	900#	0.75	1.00	1.25	1.56	1.80	2.31	2.75	3.75	4.75	5.81	6.88	8.75	10.88	12.75	14.00	16.25	18.25	20.50	24.75
	1500#	0.75	1.00	1.25	1.56	1.80	2.31	2.75	3.63	4.63	5.63	6.75	8.50	10.50	12.75	14.00	16.00	18.25	20.25	25.25
	2500#	0.75	1.00	1.25	1.56	1.88	2.31	2.75	3.63	4.63	5.63	6.75	8.50	10.93	12.50
Winding OD per Class	150#	1.25	1.56	1.88	2.38	2.75	3.38	3.88	4.75	5.88	7.00	8.25	10.38	12.50	14.75	16.00	18.25	20.75	22.75	27.00
	300#	1.25	1.56	1.88	2.38	2.75	3.38	3.88	4.75	5.88	7.00	8.25	10.38	12.50	14.75	16.00	18.25	20.75	22.75	27.00
	600#	1.25	1.56	1.88	2.38	2.75	3.38	3.88	4.75	5.88	7.00	8.25	10.38	12.50	14.75	16.00	18.25	20.75	22.75	27.00
	900#	1.25	1.56	1.88	2.38	2.75	3.38	3.88	4.75	5.88	7.00	8.25	10.13	12.25	14.50	15.75	18.00	22.50	22.50	26.75
	1500#	1.25	1.56	1.88	2.38	2.75	3.38	3.88	4.75	5.88	7.00	8.25	10.13	12.25	14.50	15.75	18.00	22.50	22.50	26.75
	2500#	1.25	1.56	1.88	2.38	2.75	3.38	3.88	4.75	5.88	7.00	8.25	10.13	12.25	14.50
Outer Ring OD per Class	150#	1.88	2.25	2.63	3.00	3.38	4.13	4.88	5.38	6.88	7.75	8.75	11.00	13.38	16.13	17.75	20.25	21.63	23.88	28.25
	300#	2.13	2.50	2.88	3.25	3.75	4.38	5.13	5.88	7.13	8.50	9.88	12.13	14.25	16.63	19.13	21.25	23.50	25.75	30.50
	600#	2.13	2.50	2.88	3.25	3.75	4.38	5.13	5.88	7.63	9.50	10.50	12.63	15.75	18.00	19.38	22.25	24.13	26.88	31.13
	900#	2.50	2.75	3.13	3.50	3.88	5.63	6.50	6.63	8.13	9.75	11.38	14.13	17.13	19.63	20.50	22.63	25.13	27.50	33.00
	1500#	2.50	2.75	3.13	3.50	3.88	5.63	6.50	6.88	8.25	10.00	11.13	13.88	17.13	20.50	22.75	25.25	27.75	29.75	35.50
	2500#	2.75	2.25	3.38	4.13	4.63	5.75	6.63	7.75	9.25	11.00	12.50	15.25	18.75	21.63

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
Inner Ring ID per Class	150#	25.75	27.75	29.75	31.75	33.75	35.75	37.75	39.75	41.75	43.75	45.75	47.75	49.75	51.75	53.50	55.50	57.50	59.50
	300#	25.75	27.75	29.75	31.75	33.75	35.75	37.50	39.50	41.50	43.50	45.38	47.63	49.00	52.00	53.25	55.25	57.00	60.00
	600#	25.50	27.50	29.75	32.00	34.00	36.13	37.50	39.75	42.00	43.75	45.75	48.00	50.00	52.00	54.25	56.25	58.00	60.25
	900#	26.00	28.00	30.25	32.00	34.00	36.25	39.75	41.75	43.75	45.50	48.00	50.00
Winding ID per Class	150#	26.50	28.50	30.50	32.50	34.50	36.50	38.50	40.50	42.50	44.50	46.50	48.50	50.50	52.50	54.50	56.50	58.50	60.50
	300#	27.00	29.00	31.25	33.50	35.50	37.63	38.50	40.25	42.25	44.50	46.38	48.63	51.00	53.00	55.25	57.25	59.50	61.50
	600#	27.00	29.00	31.25	33.50	35.50	37.63	39.00	41.25	43.50	45.75	47.75	50.00	52.00	54.00	56.25	58.25	60.50	62.75
	900#	27.00	29.00	31.25	33.50	35.50	37.75	40.75	43.25	45.25	47.50	50.00	52.00
Winding OD per Class	150#	27.75	29.75	31.75	33.88	35.88	38.13	40.13	42.13	44.25	46.38	48.38	50.38	52.50	54.50	56.50	58.50	60.50	62.50
	300#	29.00	31.00	33.25	35.50	37.50	39.63	40.00	42.13	44.13	46.50	48.38	50.63	53.00	55.00	57.25	59.25	61.50	63.50
	600#	29.00	31.00	33.25	35.50	37.50	39.63	41.00	43.25	45.50	47.75	49.75	52.00	54.00	56.00	58.25	60.25	62.50	64.75
	900#	29.00	31.00	33.25	35.50	37.50	39.75	42.75	45.25	47.25	49.50	52.00	54.00
Outer Ring OD 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	39.63	41.63	44.00	41.50	43.88	45.88	48.00	50.13	52.13	54.25	56.25	58.75	60.75	62.75	64.75
	600#	34.13	36.00	38.25	40.25	42.25	44.50	43.50	45.50	48.00	50.00	52.25	54.75	57.00	59.00	61.25	63.50	65.50	68.25
	900#	34.75	37.25	39.75	42.25	44.75	47.25	47.25	49.25	51.25	53.88	56.50	58.50
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
Inner Ring ID per Class	150#	25.75	27.75	29.75	31.75	33.75	35.75	37.75	39.75	41.75	43.75	45.75	47.75	49.75	51.75	53.75	56.00	58.19	60.44
	300#	25.75	27.75	29.75	31.75	33.75	35.75	38.25	40.25	42.75	44.25	46.38	48.50	49.88	51.88	53.75	56.25	58.44	61.31
	600#	25.38	27.00	29.63	31.25	33.50	35.50	37.50	39.75	42.00	43.75	45.75	48.00	50.00	52.00	54.25	56.25	58.00	60.25
	900#	26.25	28.25	30.75	33.00	35.25	36.25	39.75	41.75	43.75	45.50	48.00	50.00
Winding ID per Class	150#	26.50	28.50	30.50	32.50	34.50	36.50	38.37	40.25	42.50	44.25	46.50	48.50	50.50	52.50	54.50	56.88	59.07	61.31
	300#	26.50	28.50	30.50	32.50	34.50	36.50	39.75	41.75	43.75	45.75	47.88	49.75	51.88	53.88	55.25	58.25	60.44	62.56
	600#	26.13	27.75	30.63	32.75	35.00	37.00	39.00	41.25	43.50	45.75	47.75	50.00	52.00	54.00	56.25	58.25	60.50	62.75
	900#	27.25	29.25	31.75	34.00	36.25	37.25	40.75	43.25	45.25	47.50	50.00	52.00
Winding OD per Class	150#	27.50	29.50	31.50	33.50	35.75	37.75	39.75	41.88	43.88	45.88	48.19	50.00	52.19	54.19	56.00	58.18	60.19	62.44
	300#	28.00	30.00	32.00	34.00	36.00	38.00	41.25	43.25	45.25	47.25	49.38	51.63	53.38	55.38	57.25	60.00	61.94	64.19
	600#	28.13	29.75	32.63	34.75	37.00	39.00	41.00	43.25	45.50	47.75	49.75	52.00	56.00	56.00	58.25	60.25	62.50	64.75
	900#	29.50	31.50	33.75	36.00	38.25	39.25	42.75	45.25	47.25	49.50	52.00	54.00
Outer Ring OD per Class	150#	28.56	30.56	32.56	34.69	36.81	38.88	41.13	43.13	45.13	47.13	49.44	51.44	53.44	55.44	57.63	59.63	62.19	64.19
	300#	30.38	32.50	34.88	37.00	39.13	41.25	43.25	45.25	47.25	49.25	51.88	53.88	55.88	57.88	60.25	62.75	65.19	67.19
	600#	30.13	32.25	34.63	36.75	39.25	41.25	43.50	45.50	48.00	50.00	52.25	54.75	57.00	59.00	61.25	63.50	65.50	68.25
	900#	33.00	35.50	37.75	40.00	42.25	44.25	47.25	49.25	51.25	53.88	56.50	58.50

All dimensions are in inches.

316 SS Spiral Wound FG, CS OR

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Pipe Diameter Flange Rating Series Item # Availability Price Quantity UOM

1/2

150#

GSW-X6C-1500050

In Stock

$0.99/EA

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1/2 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

$0.99/EA

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In Stock

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Quantity	Price
Quantity	Price
1	$0.99/ EA
100	$0.91654/ EA
400	$0.6042/ EA
1200	$0.4752/ EA

3/4

150#

GSW-X6C-1500075

In Stock

$1.14/EA

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3/4 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

$1.14/EA

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In Stock

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Quantity	Price
Quantity	Price
1	$1.14/ EA
70	$1.05541/ EA
280	$0.69574/ EA
840	$0.5472/ EA

150#

GSW-X6C-1500100

In Stock

$1.56/EA

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1 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

$1.56/EA

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Quantity	Price
Quantity	Price
1	$1.56/ EA
70	$1.44425/ EA
280	$0.95207/ EA
840	$0.7488/ EA

1 1/4

150#

GSW-X6C-1500125

In Stock

$1.86/EA

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1 1/4 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

$1.86/EA

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In Stock

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Quantity	Price
Quantity	Price
1	$1.86/ EA
70	$1.72199/ EA
280	$1.13516/ EA
840	$0.8928/ EA

1 1/2

150#

GSW-X6C-1500150

In Stock

$2.13/EA

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1 1/2 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

$2.13/EA

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Quantity	Price
1	$2.13/ EA
70	$1.97195/ EA
280	$1.29994/ EA
840	$1.0224/ EA

150#

GSW-X6C-1500200

In Stock

$2.76/EA

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2 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

$2.76/EA

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Quantity	Price
Quantity	Price
1	$2.76/ EA
40	$2.55521/ EA
160	$1.68443/ EA
480	$1.3248/ EA

2 1/2

150#

GSW-X6C-1500250

In Stock

$3.48/EA

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2 1/2 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

$3.48/EA

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In Stock

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Quantity	Price
Quantity	Price
1	$3.48/ EA
30	$3.22178/ EA
120	$2.12384/ EA
360	$1.6704/ EA

150#

GSW-X6C-1500300

In Stock

$3.84/EA

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3 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

$3.84/EA

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In Stock

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Quantity	Price
Quantity	Price
1	$3.84/ EA
30	$3.55507/ EA
120	$2.34355/ EA
360	$1.8432/ EA

150#

GSW-X6C-1500400

In Stock

$6.18/EA

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4 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

$6.18/EA

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In Stock

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Quantity	Price
Quantity	Price
1	$6.18/ EA
25	$5.72144/ EA
100	$3.77165/ EA
300	$2.9664/ EA

150#

GSW-X6C-1500500

3-5 Working Days

$6.6/EA

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5 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

$6.6/EA

Qty

3-5 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$6.6/ EA
25	$6.11028/ EA
100	$4.02798/ EA
300	$3.168/ EA

150#

GSW-X6C-1500600

In Stock

$8.7804/EA

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6 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

$8.7804/EA

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In Stock

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Quantity	Price
Quantity	Price
1	$8.7804/ EA
25	$8.12889/ EA
100	$5.35868/ EA
300	$4.21459/ EA

150#

GSW-X6C-1500800

In Stock

$12.51/EA

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8 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

$12.51/EA

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In Stock

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Quantity	Price
Quantity	Price
1	$12.51/ EA
25	$11.58176/ EA
100	$7.63485/ EA
300	$6.0048/ EA

150#

GSW-X6C-1501000

In Stock

$16.26/EA

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10 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

$16.26/EA

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In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$16.26/ EA
40	$15.05351/ EA
160	$9.92348/ EA
480	$7.8048/ EA

150#

GSW-X6C-1501200

In Stock

$22.74/EA

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12 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

$22.74/EA

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In Stock

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Quantity	Price
Quantity	Price
1	$22.74/ EA
30	$21.05269/ EA
120	$13.87822/ EA
360	$10.9152/ EA

150#

GSW-X6C-1501400

In Stock

$27.84/EA

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14 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

$27.84/EA

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In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$27.84/ EA
20	$25.77427/ EA
80	$16.99075/ EA
240	$13.3632/ EA

150#

GSW-X6C-1501600

In Stock

$36.87/EA

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16 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

$36.87/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$36.87/ EA
20	$34.13425/ EA
80	$22.50176/ EA
240	$17.6976/ EA

150#

GSW-X6C-1501800

In Stock

$42.33/EA

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18 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

$42.33/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$42.33/ EA
20	$39.18911/ EA
80	$25.834/ EA
240	$20.3184/ EA

150#

GSW-X6C-1502000

In Stock

$44.46/EA

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20 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

$44.46/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$44.46/ EA
20	$41.16107/ EA
80	$27.13394/ EA
240	$21.3408/ EA

150#

GSW-X6C-1502400

In Stock

$59.22/EA

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24 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

$59.22/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$59.22/ EA
10	$54.82588/ EA
40	$36.14197/ EA
120	$28.4256/ EA

316 SS Spiral Wound FG, CS OR

Technical Data

Governing Standards

Governing StandardsSpiral Wound Gasket

Color Codes

Color CodesSpiral Wound Gasket

Dimensional Specifications

Dimensional SpecificationsSpiral Wound Gasket

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1/2 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

3/4 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

1 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

1 1/4 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

1 1/2 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

2 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

2 1/2 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

3 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

4 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

5 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

6 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

8 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

10 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

12 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

14 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

16 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

18 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

20 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

24 150# SPIRAL WOUND GASKET 316 STAINLESS STEEL WINDING, FLEXIBLE GRAPHITE FILLER, CARBON STEEL OUTER RING

ASME B16.20	Covers metal ring-joint gaskets, spiral-wound gaskets, metal-jacketed gaskets, and grooved metal gaskets with covering layers.
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.