ASME B16.20 · Manufacturer & exporter · Mumbai, IndiaSpiral Wound Gaskets
Metal and filler wound into a spring that keeps sealing through heat, pressure and thermal cycling. CG, CGI, R and RIR styles, to ASME, DIN, IS or your drawing.
Three parts. One spring-loaded seal.
Bolt load flattens the V-shaped windings. The metal springs back, the filler flows into the flange face, and the joint stays tight as temperatures swing.
3D renderOuter ring
Centres the gasket inside the bolts and acts as a compression stop. Its colour tells you the winding metal.
Sealing element
V-profiled stainless strip wound with graphite, PTFE, ceramic or mica filler, spot-welded at start and finish.
Inner ring
Stops windings buckling into the bore, shields them from the fluid and cuts turbulence. Required for PTFE filler.
Pick the style for your flange.
All four styles in standard ASME B16.20 sizes, large diameters and special sizes to drawing.
Outer ring
Winding with a carbon steel outer ring that centres the gasket and stops over-compression.
Raised & flat face flangesInner + outer ring
Adds an inner ring for blow-in protection and less turbulence. The choice for severe duty.
High pressure · PTFE fillerBasic
Sealing element only, with extra metal plies at start and end for stability.
Tongue & groove · male-femaleInner ring
Sealing element with an inner ring that fills the gap between bore and gasket.
Spigot & recess flangesRead the rim. Know the gasket.
Spiral wound gasket colour coding follows ASME B16.20, so anyone on site can check the winding and filler before it goes into the joint.
Winding metal
Colour painted on the outer ring rim
Filler
Stripe across the outer ring
Yellow rim = SS 304 winding. Rings on carbon steel are painted or zinc plated against corrosion; stainless rings on request.
Made in Vasai East. Packed for the world.
Every gasket here was made at our works and packed for a customer in India or overseas.
See large spiral wound gaskets in our photo gallery →
Big, odd-shaped and urgent.
The jobs a standard stockist cannot do.
Heat exchanger gaskets
Spiral wound gaskets with pass-partition bars, combined with jacketed sections, made to your exchanger drawing.
Large diameter
ASME B16.47 Series A and B, and non-standard sizes for vessels and manways.
Oval & oblong
Non-circular spiral wound gaskets for manholes, handholes and special equipment.
Specifications
- Gasket standard
- ASME B16.20 (API 601), DIN, IS, or to drawing
- Flanges
- ASME B16.5, B16.47 Series A & B, DIN 2632-2638, IS
- Pressure class
- ASME Class 150, 300, 400, 600, 900, 1500, 2500 · DIN PN ratings
- Styles
- CG, CGI, R, RIR, heat exchanger, oval & oblong
- Winding
- SS 304/304L, 316/316L, 321, 347, Monel, Inconel, Hastelloy, Titanium, others on request
- Filler
- Flexible graphite, PTFE, ceramic, mica
- Rings
- Carbon steel (painted / zinc plated), stainless steel, alloys to match
- Thickness
- 4.5 mm standard; other thicknesses for special designs
- Inspection
- Third-party inspection by LR, BV, TÜV, SGS, DNV and others
Spiral wound gasket size chart (mm).
From the JaySeal catalogue. Dimensions in mm to ASME B16.20 for ASME B16.5 flanges; B16.47 Series A & B and DIN 2632-2638 sizes on request.
JaySeal spiral wound gasket types
| JaySeal type | Construction | Typical use |
|---|---|---|
| JR | Spiral only, no inner or outer ring | Tongue & groove and recessed (groove) flanges |
| JCR | Spiral with outer (centering) ring | Centering device and compression stop; general service |
| JRIR | Spiral with inner ring only | Groove flanges and general service at higher pressure / temperature |
| JCRIR | Spiral with inner and outer ring | High pressure & temperature, critical duty; protects bore and windings |
| JHTX | Spiral with inner/outer ring and pass partition ribs | Heat exchangers, made to customer design |
ASME B16.20 dimensions for ASME B16.5 flanges — winding OD and ID (mm)
| Flange | Winding OD (d3) | Winding ID (d2) by pressure class | |||||||
|---|---|---|---|---|---|---|---|---|---|
| NPS | Class 150–600 | Class 900–2500 | 150 | 300 | 400 | 600 | 900 | 1500 | 2500 |
| 1/2 | 31.75 | 31.75 | 19.05 | 19.05 | — | 19.05 | — | 19.05 | 19.05 |
| 3/4 | 39.62 | 39.62 | 25.40 | 25.40 | — | 25.40 | — | 25.40 | 25.40 |
| 1 | 47.75 | 47.75 | 31.75 | 31.75 | — | 31.75 | — | 31.75 | 31.75 |
| 1 1/4 | 60.45 | 60.45 | 47.75 | 47.75 | — | 47.75 | — | 39.62 | 39.62 |
| 1 1/2 | 69.85 | 69.85 | 54.10 | 54.10 | — | 54.10 | — | 47.75 | 47.75 |
| 2 | 85.85 | 85.85 | 69.85 | 69.85 | — | 69.85 | — | 58.67 | 58.67 |
| 2 1/2 | 98.55 | 98.55 | 82.55 | 82.55 | — | 82.55 | — | 69.85 | 69.85 |
| 3 | 120.65 | 120.65 | 101.60 | 101.60 | — | 101.60 | 95.25 | 92.20 | 92.20 |
| 4 | 149.35 | 149.35 | 127.00 | 127.00 | 120.65 | 120.65 | 120.65 | 117.60 | 117.60 |
| 5 | 177.80 | 177.80 | 155.70 | 155.70 | 147.57 | 147.57 | 147.57 | 143.00 | 143.00 |
| 6 | 209.55 | 209.55 | 182.63 | 182.63 | 174.75 | 174.75 | 174.75 | 171.45 | 171.45 |
| 8 | 263.65 | 257.30 | 233.43 | 233.43 | 225.55 | 225.55 | 222.75 | 215.90 | 215.90 |
| 10 | 317.50 | 311.15 | 287.27 | 287.27 | 274.57 | 274.57 | 276.35 | 266.70 | 270.00 |
| 12 | 374.65 | 368.30 | 339.85 | 339.85 | 327.15 | 327.15 | 323.85 | 323.85 | 317.50 |
| 14 | 406.40 | 400.05 | 371.60 | 371.60 | 361.95 | 361.95 | 355.60 | 361.95 | — |
| 16 | 463.55 | 457.20 | 422.40 | 422.40 | 412.75 | 412.75 | 412.75 | 406.40 | — |
| 18 | 527.05 | 520.70 | 474.73 | 474.73 | 469.90 | 469.90 | 463.55 | 463.55 | — |
| 20 | 577.85 | 571.50 | 525.53 | 525.53 | 520.70 | 520.70 | 520.70 | 514.35 | — |
| 24 | 685.80 | 679.45 | 628.65 | 628.65 | 628.65 | 628.65 | 628.65 | 615.95 | — |
— = not listed in ASME B16.20 for that class (class 400 below 4", class 900 below 3", class 2500 above 12"). OD tolerance: 1/2"–8" ±0.762 mm, 10"–24" +1.524 / −0.762 mm. ID tolerance: 1/2"–8" ±0.406 mm, 10"–24" ±0.762 mm.
Centering (outer) ring OD (d4) by pressure class (mm)
| NPS | 150 | 300 | 400 | 600 | 900 | 1500 | 2500 |
|---|---|---|---|---|---|---|---|
| 1/2 | 47.75 | 54.10 | — | 54.10 | — | 63.50 | 69.85 |
| 3/4 | 57.15 | 66.80 | — | 66.80 | — | 69.85 | 76.20 |
| 1 | 66.80 | 73.15 | — | 73.15 | — | 79.50 | 85.85 |
| 1 1/4 | 76.20 | 82.55 | — | 82.55 | — | 88.90 | 104.90 |
| 1 1/2 | 85.85 | 95.25 | — | 95.25 | — | 98.55 | 117.60 |
| 2 | 104.90 | 111.25 | — | 111.25 | — | 143.00 | 146.05 |
| 2 1/2 | 123.95 | 130.30 | — | 130.30 | — | 165.10 | 168.40 |
| 3 | 136.65 | 149.35 | — | 149.35 | 168.40 | 174.75 | 196.85 |
| 4 | 174.75 | 181.10 | 177.80 | 193.80 | 206.50 | 209.55 | 234.95 |
| 5 | 196.85 | 215.90 | 212.85 | 241.30 | 247.65 | 254.00 | 279.40 |
| 6 | 222.25 | 250.95 | 247.65 | 266.70 | 289.05 | 282.70 | 317.50 |
| 8 | 279.40 | 308.10 | 304.80 | 320.60 | 358.90 | 352.55 | 387.35 |
| 10 | 339.85 | 361.95 | 358.90 | 400.05 | 435.10 | 435.10 | 476.25 |
| 12 | 409.70 | 422.40 | 419.10 | 457.20 | 498.60 | 520.70 | 549.40 |
| 14 | 450.85 | 485.90 | 482.60 | 492.25 | 520.70 | 577.85 | — |
| 16 | 514.35 | 539.75 | 536.70 | 565.15 | 574.80 | 641.35 | — |
| 18 | 549.40 | 596.90 | 593.85 | 612.90 | 638.30 | 704.85 | — |
| 20 | 606.55 | 654.05 | 647.70 | 682.75 | 698.50 | 755.65 | — |
| 24 | 717.55 | 774.70 | 768.35 | 790.70 | 838.20 | 901.70 | — |
Centering ring OD tolerance ±0.762 mm.
Inner ring ID (d1) by pressure class (mm) — ASME B16.20
| NPS | 150 | 300 | 400 | 600 | 900 | 1500 | 2500 |
|---|---|---|---|---|---|---|---|
| 1/2 | 14.22 | 14.22 | — | 14.22 | — | 14.22 | 14.22 |
| 3/4 | 20.57 | 20.57 | — | 20.57 | — | 20.57 | 20.57 |
| 1 | 26.92 | 26.92 | — | 26.92 | — | 26.92 | 26.92 |
| 1 1/4 | 38.10 | 38.10 | — | 38.10 | — | 33.27 | 33.27 |
| 1 1/2 | 44.45 | 44.45 | — | 44.45 | — | 41.40 | 41.40 |
| 2 | 55.63 | 55.63 | — | 55.63 | — | 52.32 | 52.32 |
| 2 1/2 | 66.55 | 66.55 | — | 66.55 | — | 63.50 | 63.50 |
| 3 | 81.00 | 81.00 | — | 78.74 | 78.74 | 78.74 | 78.74 |
| 4 | 106.43 | 106.43 | 102.62 | 102.62 | 102.62 | 97.79 | 97.79 |
| 5 | 131.83 | 131.83 | 128.27 | 128.27 | 128.27 | 124.46 | 124.46 |
| 6 | 157.23 | 157.23 | 154.94 | 154.94 | 154.94 | 147.32 | 147.32 |
| 8 | 215.90 | 215.90 | 205.74 | 205.74 | 196.85 | 196.85 | 196.85 |
| 10 | 268.22 | 268.22 | 255.27 | 255.27 | 246.13 | 246.13 | 246.13 |
| 12 | 317.50 | 317.50 | 307.35 | 307.35 | 292.10 | 292.10 | 292.10 |
| 14 | 349.25 | 349.25 | 342.90 | 342.90 | 320.80 | 320.80 | — |
| 16 | 400.05 | 400.05 | 389.89 | 389.89 | 374.65 | 368.30 | — |
| 18 | 449.33 | 449.33 | 438.15 | 438.15 | 425.45 | 425.45 | — |
| 20 | 500.13 | 500.13 | 488.95 | 488.95 | 482.60 | 476.25 | — |
| 24 | 603.25 | 603.25 | 590.55 | 590.55 | 590.55 | 577.85 | — |
Inner rings are required for all PTFE-filled gaskets. Inner ring thickness 2.97–3.33 mm. Inner ring ID tolerance: 1 1/4"–3" ±0.762 mm, 4"–24" ±1.524 mm.
Material temperature limits & ASME B16.20 colour code
| Material | Used as | Max. temperature | ASME colour code |
|---|---|---|---|
| Flexible graphite | Filler | 550 °C | Grey stripe |
| PTFE | Filler | 260 °C | White stripe |
| Non-asbestos / CAF | Filler | 350 °C | White / pink stripe |
| Ceramic | Filler | 650 °C | — |
| SS 304 | Winding | 650 °C | Yellow |
| SS 304L | Winding | 650 °C | Yellow with red stripe |
| SS 316 / 316L | Winding | 650 °C | Green |
| SS 316Ti | Winding | 650 °C | Light blue |
| SS 347 | Winding | 650 °C | Blue |
| SS 321 | Winding | 650 °C | Turquoise blue |
| Monel 400 | Winding | 600 °C | Orange |
| Nickel 200 | Winding | 600 °C | Red |
| Titanium | Winding | 350 °C | Purple |
| Hastelloy B-2 | Winding | 450 °C | Brown |
| Hastelloy C-276 | Winding | 450 °C | Beige |
| Inconel 600 | Winding | 950 °C | Gold |
| Inconel 625 | Winding | 950 °C | Gold |
| Inconel X-750 | Winding | 1000 °C | Light grey |
| Incoloy 825 | Winding | 950 °C | White |
The gasket temperature limit is the lower of the winding and filler limits. Graphite in oxidising service is normally limited further; ask us for your duty.
gasket vendor
Specified by refineries, gas plants and EPCs
Spiral wound gaskets, answered.
What is a spiral wound gasket?
A semi-metallic gasket made by winding a V-shaped metal strip and a soft filler (graphite, PTFE, ceramic or mica) together in a spiral. The metal acts as a spring and the filler seals, so the gasket keeps sealing through pressure and temperature cycles.
What is the difference between CG and CGI spiral wound gaskets?
A CG gasket has an outer ring only. A CGI gasket also has an inner ring, which stops the windings buckling into the bore, protects them from the process fluid and reduces turbulence. CGI is the safer choice for high pressure, high temperature and PTFE-filled gaskets.
When is an inner ring required?
ASME B16.20 calls for inner rings on PTFE-filled gaskets and on larger sizes in the higher pressure classes. Many refinery and EPC specifications ask for inner rings on all spiral wound gaskets. Tell us your spec and we will match it.
What do the colours on a spiral wound gasket mean?
The colour painted on the outer ring rim shows the winding metal (for example yellow for SS 304, green for SS 316), and the stripe shows the filler (grey for graphite, white for PTFE). It lets anyone on site check the gasket before it goes into the joint.
What do you need to quote spiral wound gaskets?
Size (NPS or drawing), pressure class, flange standard, style (CG, CGI, R or RIR), winding metal, filler, ring materials and quantity. We supply across India and export to the Gulf, Africa and Asia.
Send your drawing.
Get a price.
Tell us the gasket type, size or drawing, material, pressure class, standard and quantity. Our engineers reply with price and delivery.
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