IS 6392 BIS Certification for Steel Pipe Flanges
Steel Pipe Flanges made, imported or sold in India must be certified against IS 6392 under an ISI mark licence (Scheme-I). What the standard covers, how testing works and how to get the licence.
About IS 6392
| Standard | IS 6392 : 2020 |
|---|---|
| Title | Steel Pipe Flanges |
| Product covered | Steel Pipe Flanges |
| Category | Miscellaneous Steel Products |
| Scheme | ISI mark licence (Scheme-I) |
| Notified under | Miscellaneous Steel Products (Quality Control) Order, 2023, S.O. 4240(E), dated 25th September 2023 · Order PDF |
Editions and amendments of IS 6392
| Edition | Published | Status |
|---|---|---|
| IS 6392:2020 Steel Pipes Flanges — Specification ( First Revision ) | 30 Jun 2020 | Current, next review 31 Mar 2028 |
| IS 6392:1971 Specification for steel pipe flanges | Withdrawn 20 May 2024 |
Amendments:First Amendment (2023). Test reports must reflect the standard with its amendments.
Marking fee for IS 6392
BIS charges an annual minimum marking fee for the ISI mark under IS 6392, set by unit size, plus a per-unit rate once production passes the minimum:
| Unit size | Minimum marking fee (per year) |
|---|---|
| Large | ₹51,000 |
| Medium | ₹41,000 |
| Small | ₹25,500 |
| Micro | ₹10,200 |
Unit rate: ₹1.75 per piece. Source: BIS marking fee schedule for Scheme-I products, September 2026.
ISI licences under IS 6392
BIS records 6 operative licences (6 including deferred, cancelled or under stop marking). Most licensed factories are in West Bengal (6).
Testing against IS 6392
BIS inspects the factory and has samples tested to the full Indian Standard at a BIS or BIS-recognised laboratory. After grant, the factory keeps testing production under the Scheme of Inspection and Testing, and BIS draws factory and market samples.
The test report has to cover every clause of IS 6392 that applies to the product, in the edition current on the date of testing. When BIS revises IS 6392 or replaces it with a new edition, existing licence holders move to the new edition by the date BIS sets in its notification.
How to get an ISI mark licence under IS 6392
The licence is granted to the manufacturer for a specific factory and product. Indian factories apply under Scheme-I; overseas factories apply under the Foreign Manufacturers Certification Scheme (FMCS) and must nominate an Authorised Indian Representative.
- Confirm the exact Indian Standard and the varieties to cover
- Get the product tested at a BIS-recognised lab (simplified procedure) or arrange BIS sampling
- Apply on Manak Online with factory, quality-control and test documents
- BIS factory inspection and sample verification
- Grant of licence, then marking with the ISI mark and CM/L number
Timeline. BIS targets 30 days under the simplified procedure (applying with a recent lab test report) and 90 days under the normal procedure. Overseas factories under FMCS typically take around 6 months.
Fees. Application fee ₹1,000 and annual licence fee ₹1,000, inspection charges of ₹7,000 per man-day, testing charges, and an annual minimum marking fee set for each Indian Standard (with concessions for micro and small units).
Mark. Certified products carry the ISI Standard Mark with the IS number and the CM/L-XXXXXXXXXX licence number.
Frequently asked questions
What does IS 6392 cover?
IS 6392 : 2020: Steel Pipe Flanges. BIS has made certification against it compulsory for steel pipe flanges.
Is BIS certification under IS 6392 mandatory?
Yes, for steel pipe flanges, under the Miscellaneous Steel Products (Quality Control) Order, 2023, S.O. 4240(E). The product needs a valid BIS licence (ISI mark) and must carry the ISI Standard Mark with the IS number and the CM/L-XXXXXXXXXX licence number.
Where is a product tested for IS 6392?
BIS inspects the factory and has samples tested to the full Indian Standard at a BIS or BIS-recognised laboratory. After grant, the factory keeps testing production under the Scheme of Inspection and Testing, and BIS draws factory and market samples.
How long does IS 6392 BIS certification take?
BIS targets 30 days under the simplified procedure (applying with a recent lab test report) and 90 days under the normal procedure. Overseas factories under FMCS typically take around 6 months.
Other standards in Miscellaneous Steel Products
- IS 6913 Stainless Steel Tubes for the Food and Beverage Industry
- IS 15155 Bar or Wire Wrapped Steel Cylinder Pipes with Mortar Lining and Coating Including Specials
- IS 16651 High Strength Deformed Stainless Steel Bars and Wires for Concrete Reinforcement
Source: BIS lists of products under compulsory certification (Scheme-I, Scheme-II), checked October 2026. See the full BIS product list or all Indian Standards.
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