Spiral Wound Gaskets

Resilient metal-wound flange seal

A precision V-section winding of 316L stainless and flexible graphite that recovers under bolt load and thermal cycling for leak-free flanged joints.

Spring-like recovery absorbs thermal cycling and bolt relaxation
Inner compression ring prevents buckling and over-torque
Outer centring ring resists blow-out and aids alignment
Colour-coded winding and filler identification per ASME B16.20
Fire-safe (API 6FB) and TA-Luft low-emission options available

Temperature: -200°C to +650°C
Pressure: Up to 250 bar · PN250 / ASME Class 2500
pH range: 0 – 14

SPIRAL WOUND · SS / GRAPHITESECTION VIEW

Technical DatasheetSPEC

The numbers, on the record

Every figure below is the specification we hold ourselves to — material, service envelope, media compatibility and conformance. Download it as a standalone document for your dossier.

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Technical Datasheet

Doc No.: DS-SPIRAL-WOUND-GASKET
Revision: Rev. A
Issue: 2026-Q3
Class: Gaskets

Spiral Wound Gaskets

Resilient metal-wound flange seal

01

Material & Construction

316L stainless winding with flexible graphite filler; carbon steel or 316 centring and inner rings

02

Service Envelope

Temperature range	-200°C to +650°C
Pressure rating	Up to 250 bar · PN250 / ASME Class 2500
pH range	0 – 14

03

Media Compatibility

SteamHydrocarbonsHydrogenMineral oilsSolvents

04

Dimensions & Sizing

DN15–DN600 · ASME Class 150–2500 · PN10–PN250; standard and custom bores to drawing

05

Standards & Conformance

ASME B16.20
API 601
EN 1514-2

06

Certifications

ISO 9001
API 6FB Fire-Safe
TA-Luft (VDI 2440)

07

Additional Specifications

Filler options	Flexible graphite / PTFE / mica
Winding metal	316L SS standard; Inconel, Monel, Ti optional

Nominal thickness	4.5 mm (CGI) · 3.2 mm (CG)
Identification	Colour-coded per ASME B16.20

Specify & QuoteORDER

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Choose the material grade and size that match your duty, set a quantity, and add a fully-specified line to your quote. No prices, no obligation — our engineers confirm specification and lead time on every enquiry.

01

Material grades

316L SS winding / flexible graphite filler
316L SS winding / PTFE filler
Inconel 625 winding / graphite filler
Carbon steel centring ring (zinc plated)
Mica filler (high-temperature service)

02

Sizes & configurations

DN15–DN600 (½"–24")
ASME Class 150–2500
PN10–PN250
With inner + outer rings (CGI)
Ring + outer only (CG)
Custom bore / OD to drawing

In ServiceUSE

Where it holds the line

The spiral-wound gasket is the default choice for critical flanges because it does what flat gaskets can't — it springs back. Alternating plies of preformed 316L stainless and soft filler form a controlled-recovery element that tracks bolt relaxation and thermal movement without losing seating stress, while inner and outer guide rings centre the gasket and stop over-compression and blow-out. Colour-coded to ASME B16.20 for instant identification, it delivers a dependable seal on everything from steam headers to high-pressure hydrocarbon pipework.

Typical applications

01Refinery and petrochemical process flanges
02High-pressure steam and boiler connections
03Shell-and-tube heat exchanger covers
04Pipeline and manifold flange joints
05High-temperature hydrocarbon service

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Send us the media, temperature, pressure and motion for your duty and our engineers will confirm the right material grade, size and standard for your application.

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