IS 4521 BIS Certification for Wire Ropes Used in Oil Wells and Oil Well Drilling

About IS 4521

Editions and amendments of IS 4521

No amendments to the current edition are listed by BIS.

Marking fee for IS 4521

BIS charges an annual minimum marking fee for the ISI mark under IS 4521, set by unit size, plus a per-unit rate once production passes the minimum:

Unit rate: ₹103.7 per ton. Source: BIS marking fee schedule for Scheme-I products, September 2026.

Sampling and key tests for IS 4521

From the BIS product manual for IS 4521, which BIS officers and applicants follow for certification:

Sample quantity:4 meter

Raw material requirements:

• Wires for guy strands- as per Cl. 6.1 of IS 4521 Fiber core- as per IS 1804 Steel Core- as per Cl. 4 and 6.3.2 of IS 6594

ISI licences under IS 4521

BIS records 6 operative licences (6 including deferred, cancelled or under stop marking). Most licensed factories are in Maharashtra (3), Gujarat (1), Jharkhand (1), Uttar Pradesh (1).

Testing against IS 4521

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 4521 that applies to the product, in the edition current on the date of testing. When BIS revises IS 4521 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 4521

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 Steel Wires or Strands, Nylon or Wire Ropes and Wire mesh

• IS 278 Galvanized Steel Barbed Wire for Fencing
• IS 1855 Stranded Steel Wire Ropes for Winding and Man –riding Haulages in Mines
• IS 1856 Steel Wire Rope Forhaulage
• IS 2141 Hot Dip Galvanized Stay Strand
• IS 2266 Steel Wire Ropes for General Engineering Purposes
• IS 2365 Steel Wire Suspension Ropes for Lifts, Elevators and Hoists
• IS 6590 Braided Nylon Ropes for Mountaineering Purposes
• IS 16014 Mechanically Woven, Double- Twisted, Hexagonal Wire Mesh Gabions, Revet Mattresses and Rock Fall Netting and Other Rock Fall Netting and Other Products for Civil Engineering Purposes (Galvanized Steel Wire or Galvanized Steel Wire with Polymer Coating)

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.