IS 16651 BIS Certification for High Strength Deformed Stainless Steel Bars and Wires for Concrete Reinforcement

About IS 16651

Editions and amendments of IS 16651

No amendments to the current edition are listed by BIS.

Marking fee for IS 16651

BIS charges an annual minimum marking fee for the ISI mark under IS 16651, set by unit size, plus a per-unit rate once production passes the minimum:

Unit rate: ₹6.2 per ton. Source: BIS marking fee schedule for Scheme-I products, September 2026.

Sampling and key tests for IS 16651

From the BIS product manual for IS 16651, which BIS officers and applicants follow for certification:

Sample quantity:For Physical test – 1 m x 3 Nos

Tests BIS can carry out in a day during factory inspection:

• Chemical Composition (Clause 4.3)
• Surface Quality (Clause 4.4)
• Deformation and surface characteristics (Clause 5.2 to Clause 5.6)
• Nominal size (Clause 6)
• Effective cross sectional area and mass (Clause 6.3)
• Specified length (Clause 7.1)
• Tensile Properties (Clause 8.2)
• Bend and Re-bend test (Clause 8.3)

The full type test covers every clause of IS 16651; the list above is what can be checked on site.

ISI licences under IS 16651

BIS records 11 operative licences (11 including deferred, cancelled or under stop marking). Most licensed factories are in Uttar Pradesh (3), Gujarat (2), Maharashtra (2), Andhra Pradesh (1), Uttarakhand (1).

Testing against IS 16651

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 16651 that applies to the product, in the edition current on the date of testing. When BIS revises IS 16651 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 16651

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.

1. Confirm the exact Indian Standard and the varieties to cover
2. Get the product tested at a BIS-recognised lab (simplified procedure) or arrange BIS sampling
3. Apply on Manak Online with factory, quality-control and test documents
4. BIS factory inspection and sample verification
5. 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

Other standards in Miscellaneous Steel Products

• IS 6392 Steel Pipe Flanges
• 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

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.