SWG, Style WR, 500NB ANSI 150 CS-316-Graph

High Quality Metal Gaskets for High Pressure Sealing.

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  • Spiral Wound Gaskets made to Suit 500NB (20") ANSI 150 # Flanges.
  • Carbon Steel Outer Ring with 316 Stainless Steel Windings and a Flexible Graphite Filler.
  • No minimum order quantities.
  • Excellent quality for long-lasting, high performance sealing.

The 500NB ANSI 150 Spiral Wound Gaskets available from this page are made using the commonly used WR construction. They are made from a combination of a Carbon Steel Outer Ring, 316 Stainless Steel Windings and a flexible Graphite Filler.

500NB ANSI 150 WR Spiral Dimensions

Flange Nominal
Bore
Imperial
Short-Hand
Windings
Inside Diameter
Windings
Outside Diameter
Outer Ring
Outside Diameter
Gasket
Thickness
500NB 20" 525.6mm 577.9mm 606.4mm 4.5mm

General Information on our Range of Style WR Spiral Wound Gaskets.

Spiral Wound Gaskets Style WR Cross Section ViewOur Spiral Wound Gasket Naming Convention.

Before proceeding with more information on spiral wound gasket performance capabilities and sizing, we thought it may be a good idea to explain the word-salad of a product name. Each part is explained below:

Style WR Spiral Wound Gaskets.

Style WR Spirals are made with a sealing component (metallic windings and a flexible, non-metallic filler) and an additional, solid metal outer ring.

The outer ring (also known as a centring ring or guide ring) centres the gasket on the flange and sits flush with the bolts. It also acts as an anti-blowout device, provides radial support to the sealing components and acts as a compression stop to prevent the windings and filler being crushed due to over tightening of the bolts.

Most commonly, outer rings are produced from mild steel or stainless steel but can be produced from other metals when required. The spiral wound gaskets listed on this page all feature a Carbon Steel Guide Ring with 316 Stainless Steel Windings and a Flexible Graphite Filler.

CS-316-Graph Meaning.

Each of the above stands for one of the materials used for making this spiral. Specifically,

CS = Carbon Steel, Used for the Outer Ring of the Gasket.

316 = 316 Stainless Steel, Used for the Windings on the Spiral.

Graph = Flexible Graphite. Used as a filler between the layers of Windings to assist with compression and sealing.

Spiral Wound Gasket Colour Coding as per ASME B16.20 Specifications.

All Spiral Wound Gaskets from Swift Supplies are colour coded in accordance with ASME B16.20 requirements (with the exception of style W (windings only spirals) as colour coding is not practical).

The colour code key is included below. Since this page features CS-316-Graph spirals, all will have the outside face of their guide ring painted green (316L SS Windings) with grey strips (flexible graphite filler).

Metallic Winding Materials
Material Colour   Material Colour
304 Stainless Steel Yellow   Incoloy White
316L Stainless Steel Green   Titanium Purple
317L Stainless Steel Maroon   Alloy 20 Black
347 Stainless Steel Blue   Carbon Steel Silver
321 Stainless Steel Tourquoise   Hastelloy "B" Brown
Monel Orange   Hastelloy "C" Beige
Inonel Gold   Phos. Bronze Copper
Nickel Red
Non-Metallic Filler Materials
Material Colour
(Applied as Stripes)
PTFE White
Ceramic Light Green
Flexible Graphite Grey
Phyllosilicate (HTG) Light Blue

Markings for Standard Spiral Wound Gaskets.

Our spiral wound gaskets to suit standard (i.e. non-custom) flanges each have their size, style and material information stamped onto them (again, excluding style W as there is nowhere to stamp).

The image below provides an overview of the information stamped on each spiral.

Swift Supplies Spiral Wound Gasket - Etched Markings Schematic

Style WR Spiral Wound Gaskets to suit ANSI B16.5 Flanges Size Tables.

ANSI 150 ButtonANSI 300 ButtonANSI 600 ButtonANSI 900 ButtonANSI 1500 Button

Class 150 Ring Gasket Sizes.

All Dimensions below are given in millimeters (mm).

Flange Nominal
Bore
Imperial
Short-Hand
Windings
Inside Diameter
Windings
Outside Diameter
Outer Ring
Outside Diameter
Matches
Table
15NB 1/2" 19.1 31.8 47.6 N/A
20NB 3/4" 25.4 39.7 57.2 N/A
25NB 1" 31.8 47.6 66.7 N/A
32NB 1 1/4" 47.6 60.3 76.2 N/A
40NB 1 1/2" 54 69.9 85.7 N/A
50NB 2" 69.9 85.7 104.8 N/A
65NB 2 1/2" 82.6 98.4 123.8 N/A
80NB 3" 101.6 120.7 136.5 N/A
90NB* 3 1/2" 114.3 133.4 161.9 N/A
100NB 4" 127 149.2 174.6 N/A
125NB 5" 155.6 177.8 196.9 N/A
150NB 6" 182.6 209.6 222.3 N/A
200NB 8" 233.4 263.5 279.4 N/A
250NB 10" 287.3 317.5 339.7 N/A
300NB 12" 339.7 374.7 409.6 N/A
350NB 14" 371.5 406.4 450.9 N/A
400NB 16" 422.3 463.6 514.4 N/A
450NB 18" 474.7 527.1 549.3 N/A
500NB 20" 525.5 577.9 606.4 N/A
600NB 24" 628.7 685.8 717.6 N/A

*Not officially included in ASME B16.20 specification.

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Class 300 Ring Gasket Sizes.

All Dimensions below are given in millimeters (mm).

Flange Nominal
Bore
Imperial
Short-Hand
Windings
Inside Diameter
Windings
Outside Diameter
Outer Ring
Outside Diameter
Matches
Table
15NB 1/2" 19.1 31.8 54 ANSI 600
20NB 3/4" 25.4 39.7 66.7 ANSI 600
25NB 1" 31.8 47.6 73 ANSI 600
32NB 1 1/4" 47.6 60.3 82.6 ANSI 600
40NB 1 1/2" 54 69.9 95.3 ANSI 600
50NB 2" 69.9 85.7 111.1 ANSI 600
65NB 2 1/2" 82.6 98.4 130.2 ANSI 600
80NB 3" 101.6 120.7 149.2 ANSI 600
90NB* 3 1/2" 114.3 133.4 165.1 N/A
100NB 4" 127 149.2 181 N/A
125NB 5" 131.8 155.6 177.8 N/A
150NB 6" 182.6 209.6 250.8 N/A
200NB 8" 233.4 263.5 308 N/A
250NB 10" 287.3 317.5 362 N/A
300NB 12" 339.7 374.7 422.3 N/A
350NB 14" 371.5 406.4 485.8 N/A
400NB 16" 422.3 463.6 539.8 N/A
450NB 18" 474.7 527.1 596.9 N/A
500NB 20" 525.5 577.9 654.1 N/A
600NB 24" 628.7 685.8 774.7 N/A

*Not officially included in ASME B16.20 specification.

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Class 600 Ring Gasket Sizes.

All Dimensions below are given in millimeters (mm).

Flange Nominal
Bore
Imperial
Short-Hand
Windings
Inside Diameter
Windings
Outside Diameter
Outer Ring
Outside Diameter
Matches
Table
15NB 1/2" 19.1 31.8 54 ANSI 300
20NB 3/4" 25.4 39.7 66.7 ANSI 300
25NB 1" 31.8 47.6 73 ANSI 300
32NB 1 1/4" 47.6 60.3 82.6 ANSI 300
40NB 1 1/2" 54 69.9 95.3 ANSI 300
50NB 2" 69.9 85.7 111.1 ANSI 300
65NB 2 1/2" 82.6 98.4 130.2 ANSI 300
80NB 3" 101.6 120.7 149.2 ANSI 300
90NB* 3 1/2" 114.3 133.4 161.9 N/A
100NB 4" 127 149.2 193.7 N/A
125NB 5" 131.8 155.6 241.3 N/A
150NB 6" 182.6 209.6 266.7 N/A
200NB 8" 233.4 263.5 320.7 N/A
250NB 10" 287.3 317.5 400.1 N/A
300NB 12" 339.7 374.7 457.2 N/A
350NB 14" 371.5 406.4 492.1 N/A
400NB 16" 422.3 463.6 565.2 N/A
450NB 18" 474.7 527.1 612.8 N/A
500NB 20" 525.5 577.9 682.6 N/A
600NB 24" 628.7 685.8 790.6 N/A

*Not officially included in ASME B16.20 specification.

Return to Sizing Table Menu.

Class 900 Ring Gasket Sizes.

All Dimensions below are given in millimeters (mm).

Flange Nominal
Bore
Imperial
Short-Hand
Windings
Inside Diameter
Windings
Outside Diameter
Outer Ring
Outside Diameter
Matches
Table
15NB 1/2" 19.1 31.8 63.5 ANSI 1500
20NB 3/4" 25.4 39.7 69.9 ANSI 1500
25NB 1" 31.8 47.6 79.4 ANSI 1500
32NB 1 1/4" 47.6 60.3 88.9 ANSI 1500
40NB 1 1/2" 54 69.9 98.4 ANSI 1500
50NB 2" 69.9 85.7 142.9 ANSI 1500
65NB 2 1/2" 82.6 98.4 165.1 ANSI 1500
80NB 3" 101.6 120.7 168.3 N/A
90NB* 3 1/2" 114.3 133.4 190.5 N/A
100NB 4" 127 149.2 206.4 N/A
125NB 5" 131.8 155.6 247.7 N/A
150NB 6" 182.6 209.6 288.9 N/A
200NB 8" 233.4 263.5 358.8 N/A
250NB 10" 287.3 317.5 435 N/A
300NB 12" 339.7 374.7 498.5 N/A
350NB 14" 371.5 406.4 520.7 N/A
400NB 16" 422.3 463.6 574.7 N/A
450NB 18" 474.7 527.1 638.2 N/A
500NB 20" 525.5 577.9 698.5 N/A
600NB 24" 628.7 685.8 838.2 N/A

*Not officially included in ASME B16.20 specification.

Return to Sizing Table Menu.

Class 1500 Ring Gasket Sizes.

All Dimensions below are given in millimeters (mm).

Flange Nominal
Bore
Imperial
Short-Hand
Windings
Inside Diameter
Windings
Outside Diameter
Outer Ring
Outside Diameter
Matches
Table
15NB 1/2" 19.1 31.8 63.5 ANSI 900
20NB 3/4" 25.4 39.7 69.9 ANSI 900
25NB 1" 31.8 47.6 79.4 ANSI 900
32NB 1 1/4" 47.6 60.3 88.9 ANSI 900
40NB 1 1/2" 54 69.9 98.4 ANSI 900
50NB 2" 69.9 85.7 142.9 ANSI 900
65NB 2 1/2" 82.6 98.4 165.1 ANSI 900
80NB 3" 101.6 120.7 174.6 N/A
90NB* 3 1/2" 114.3 133.4 187.3 N/A
100NB 4" 127 149.2 209.6 N/A
125NB 5" 131.8 155.6 254 N/A
150NB 6" 182.6 209.6 282.6 N/A
200NB 8" 233.4 263.5 352.4 N/A
250NB 10" 287.3 317.5 435 N/A
300NB** 12" 339.7 374.7 520.7 N/A
350NB** 14" 371.5 406.4 577.9 N/A
400NB** 16" 422.3 463.6 641.4 N/A
450NB** 18" 474.7 527.1 704.9 N/A
500NB** 20" 525.5 577.9 755.7 N/A
600NB** 24" 628.7 685.8 901.7 N/A

*Not officially included in ASME B16.20 specification.
** Not reccommended. A spiral with an inner ring (style WRIR) is suggested for this size and pressure rating.

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(SWM000304B01V0019)

SKU SWM000304B01V0019
Shipping Weight 2.6400kg
Unit Of Measure Each

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