Spiral Wound Gasket with Outer Ring
Model:KXT 600CG
The standard version is the Style CGI Spiral Wound Gasket with Outer Ring with inner and outer ring. This gasket has the best sealing characteristics combined with the highest safety for flanged joints with flat face and raised face
Style KXT 600-CG
Spiral Wound Gasket with Outer Ring for Raised Face & Flat Face Flanges
Buying a spiral wound gasket for RF or FF flanges? The outer (centring) ring holds the V-shaped stainless winding in place on the bolt circle and stops it being crushed by over-bolting — so the gasket seals correctly every time, even when the flange faces are less than perfect.
Manufactured in our own workshop to ASME B16.20 / EN 1514-2 / API 601, in sizes DN15–DN3000 and Class 150–2500. Send your flange size, media, pressure and temperature — technical reply and quotation within 2 business hours.
A spiral wound gasket with outer ring (CG type, KXT 600-CG) combines a V-shaped metal winding with a centring ring that positions the gasket on the bolt circle and limits over-compression. Sizes DN15–DN3000, Class 150–2500, RF and FF flanges. Standard supply is SS316 winding + graphite filler + carbon steel zinc-plated outer ring. EN 10204 3.1 certificates available on request.
01What the outer ring actually does for you
Buyers often ask why they should pay for an outer ring when a basic winding-only gasket is cheaper. The answer is in the installation and in the long-term reliability of the joint:
- It centres the gasket on the bolt circle. The sealing element is positioned accurately on the flange face by the bolts — no guessing, no off-centre seating, no partial sealing.
- It acts as a compression stop. When the bolts are tightened, the outer ring limits how far the winding can be crushed, protecting it from over-compression and keeping the spring-back that makes a spiral wound gasket seal.
- It keeps the winding intact. The winding is spot-welded to the outer ring, so the gasket will not unwind or distort during handling and installation.
- It works on both RF and FF flanges. One construction, two flange types — fewer part numbers to stock, less chance of picking the wrong gasket from the warehouse.
When CG is not enough: the outer ring does not protect the inside of the winding. For high vacuum, high flow velocity, or media that causes turbulence and erosion, specify the CGI version with an inner ring as well — it prevents inward buckling and shields the flange bore.
02CG or CGI? Pick the right construction
Both constructions use the same V-shaped winding and filler. The difference is the inner ring — and whether your line actually needs it. The two panels below show what each version is designed to do.
Style KXT 600-CG Winding + Outer Ring
- Centring ring positions the gasket on the bolt circle
- Serves as compression stop against over-bolting
- Suitable for raised face and flat face flanges
- General purpose, most economical ringed version
Style KXT 600-CGI Winding + Inner Ring + Outer Ring
- Inner ring prevents inward buckling of the winding
- Reduces turbulence and erosion at the flange bore
- Acts as a heat shield and corrosion barrier
- Highest safety for critical flanged joints
Still unsure? Tell us the line conditions and we will recommend the construction — there is no benefit in selling you a CGI gasket if a CG will do the job.
03Specifications
- Model
- KXT 600-CG (outer ring only) · KXT 600-CGI (inner + outer ring)
- Size range
- DN15 – DN3000 (NPS ½" – 120"); non-standard sizes and bolt circles to drawing
- Pressure class
- Class 150 / 300 / 600 / 900 / 1500 / 2500 · PN10 / 16 / 25 / 40 / 64 / 100 / 160 / 250 / 320
- Gasket thickness
- 3.2 mm and 4.5 mm standard; 2.0 – 6.0 mm on request
- Winding strip
- Pre-formed V-shape, 0.15 – 0.25 mm thick
- Filler strip
- 0.4 – 0.8 mm thick
- Outer ring
- Carbon steel (zinc plated / painted) · SS304 · SS316 · SS316L
- Flange facing
- Raised face (RF) and flat face (FF)
- Standards
- ASME B16.20, ASME B16.5, EN 1514-2, API 601, DIN 2690, JIS B2404, GB/T 4622, HG/T 20610
- Marking
- Standard, size, class, material code and heat number stamped on the outer ring
- Certificates
- EN 10204 3.1 on request; third-party inspection (SGS / BV / TUV) supported
- Lead time
- Standard materials 7–15 working days from order confirmation; exotic alloys quoted against real mill availability
Winding metal options
- SS 304 / 304L
- SS 316 / 316L
- SS 321
- SS 347
- SS 309
- SS 310
- SS 317L
- SS 904L
- SS 410
- Monel 400
- Inconel 600
- Inconel 625
- Inconel 800 / 800H
- Inconel 825
- Hastelloy B3
- Hastelloy C276
- Titanium Gr.2
Filler options
- Flexible Graphite
- PTFE
- Non-Asbestos
- Mica
Standard supply is SS316 winding with graphite filler and a carbon steel zinc-plated outer ring — the most cost-effective combination for steam, water, oil and general chemical service. For aggressive or high-temperature duty where 304/316 windings are not enough, see our dedicated special materials spiral wound gaskets range.
04Where these gaskets are used
- High temperature and high pressure equipment
- Cryogenic and low temperature equipment
- General flange joints — raised face and flat face
- Pumps, valves, compressors and fittings
- Heat exchangers, columns and reactor flanges — see our heat exchanger spiral wound gaskets
- Steam, condensate, water, oil and gas utility lines
It is a general-purpose gasket, but it is not a "one size fits everything" gasket. If your line runs at high vacuum, high flow velocity or with a highly aggressive medium, tell us before ordering — the correct answer may be the CGI version or a different filler.
Related product ranges in the same family: all spiral wound gaskets, standard spiral wound gasket (KXT-600), inner and outer ring (CGI) version, oval and oblong gaskets for boilers, ring joint gaskets and expanded graphite gaskets.
05What Buyers Get From Kaxite
Direct factory pricing
We wind, weld, size and inspect every gasket in our own workshop. No trading company mark-up. See our workshop.
Material traceability
Heat number on every batch, PMI verification on incoming strip, EN 10204 3.1 certificates on request. See our certificates.
2-hour technical reply
Our technical sales team reviews your media, pressure and temperature and comes back with a recommendation — not just a price.
No rigid MOQ
Single pieces for maintenance and shutdown work accepted at the same unit price structure. No tooling cost for standard sizes.
Drawing & sample production
Non-standard OD, ID, bolt circle, thickness and pass partitions produced to your PDF, DWG or DXF drawing.
Export-ready packing
Plastic film protection inside wooden pallets or cases suitable for sea and air freight. See packaging & shipping.
06Ordering, packing and shipping
Information needed for a firm quotation
- Gasket standard and size — DN or NPS, Class or PN
- Construction — CG (outer ring only) or CGI (inner + outer ring)
- Winding metal and filler material
- Outer ring material and finish (zinc plated, painted or stainless)
- Operating pressure, temperature and media
- Quantity and required delivery date
- Documentation — EN 10204 3.1 certificate, third-party inspection or test reports
Packing
Each gasket is protected with plastic film, then packed in wooden pallets or wooden cases suitable for sea and air freight. Customer labels and packing lists are available on request — see packaging & shipping.
Shipping
By sea, by rail or by air, depending on your schedule and destination. Standard materials normally ship within 7–15 working days of order confirmation.
07Gasket identification
Every outer ring is stamped so your maintenance team can verify the gasket on site without opening the line. Standard marking covers size, pressure class, material code and heat number — the same information that appears on the material certificate.
08Buyer FAQ
What is your minimum order quantity?
There is no rigid minimum for standard sizes — we regularly supply small quantities for maintenance and shutdown work. For special winding metals a modest MOQ may apply, and we will state it clearly in the quotation.
Do you supply material certificates?
Yes. EN 10204 3.1 certificates are available on request, and third-party inspection (SGS, BV, TUV or client-nominated) can be arranged at additional cost. See our certificates.
Can you produce non-standard sizes or bolt circles?
Yes. Non-standard OD, ID, bolt circle, thickness and pass partitions are routine. Send a drawing (PDF, DWG or DXF) or a sample and we will confirm feasibility and price.
What payment terms do you accept?
Normally T/T with a 30% deposit and balance before shipment. L/C at sight can be discussed for larger orders. Terms are confirmed in the quotation.
How quickly can you quote?
Send the flange standard and size, construction, winding metal, filler, media, pressure, temperature and quantity. With these details we can give you a technical recommendation and price within 2 business hours.
What if the gasket leaks after installation?
Contact us with the bolting torque, flange condition and operating data. Most failures trace back to insufficient bolt load, a damaged flange face or the wrong filler for the media — we will help you work out which, and replace the gasket if it is our fault.
Get a quotation on your gasket schedule
Send us your flange list or data sheet and we will come back with a technical recommendation, price and realistic delivery date. Include your flange specification, operating pressure, temperature and process media for the fastest response.
- Tel: 0086-574-87527771
- E-mail: kaxite@seal-china.com
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Address
No. 432 Zhenhai Middle Road, Luotuo Street, Zhenhai District, Ningbo City, Zhejiang China
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