IS 12427 BIS Certification for Fasteners – Threaded Steel Fasteners – Hexagon Head Transmission Tower Bolts

About IS 12427

Editions and amendments of IS 12427

No amendments to the current edition are listed by BIS.

Marking fee for IS 12427

BIS charges an annual minimum marking fee for the ISI mark under IS 12427, set by unit size, plus a per-unit rate once production passes the minimum:

Unit rate: ₹86 per ton. Source: BIS marking fee schedule for Scheme-I products, September 2026.

Sampling and key tests for IS 12427

From the BIS product manual for IS 12427, which BIS officers and applicants follow for certification:

Sample quantity:Five samples

ISI licences under IS 12427

BIS records 41 operative licences (41 including deferred, cancelled or under stop marking). Most licensed factories are in Punjab (20), West Bengal (6), Maharashtra (3), Haryana (3), Uttar Pradesh (3).

Testing against IS 12427

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 12427 that applies to the product, in the edition current on the date of testing. When BIS revises IS 12427 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 12427

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 Bolts, Nuts and Fasteners

• IS 204 2 products
• IS 281 Mild Steel Sliding Door Bolts for Use with Padlocks
• IS 1284 Wrought Aluminium Alloy Bolt and Screw Stock for General Engineering Purposes
• IS 1363 3 products
• IS 1364 2 products
• IS 2681 Non-ferrous Metal Sliding Door Bolts (aldrops) for Use with Padlocks
• IS 3757 High Strength Structural Bolts
• IS 4621 Indicating Bolts for Use in Public Baths and Lavatories
• IS 5187 Flush Bolts
• IS 6623 High Strength Structural Nuts

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.