That luxury ends in March 2026.
Under the ISI Mark for Bolts, Nuts and Fasteners (Quality Control) Order, 2023, a wide range of bolts, nuts, and fasteners cannot be manufactured, sold, or imported in India without a valid ISI Mark.
And no this is not just paperwork. For manufacturers who wait too long, the real risks are:
- Production stoppages
- Rejected BIS applications
- Re-testing costs
- Missed supply contracts
This article explains what factory owners must actually do, not what notifications vaguely say.
Why the ISI Mark for Bolts, Nuts & Fasteners Is Now Mandatory
- Infrastructure projects
- Power transmission
- Heavy machinery
- Automotive and industrial assemblies
Because of repeated quality failures and inconsistent manufacturing standards, BIS has brought fasteners under mandatory certification to ensure:
- Strength reliability
- Dimensional accuracy
- Material consistency
- Traceability of manufacturers
Once notified, non-ISI-marked fasteners are treated as illegal for sale in India.
Applicable of Indian Standard For ISI Mark for Bolts, Nuts and Fasteners
This table highlights the BIS ISI Mark Schema applicable Indian Standards for bolts, nuts, and fasteners. Accurate mapping of products to the correct IS standard is essential for successful ISI Mark certification and compliance.
| S. No. | Product Description | IS Standard |
|---|---|---|
| 1 | Hexagon Head Bolts, Screws & Nuts – Product Grade C | IS 1363 (Part 1):2019 |
| 2 | Hexagon Head Screws | IS 1363 (Part 2):2018 |
| 3 | Hexagon Nuts – Product Grade C | IS 1363 (Part 3):2018 |
| 4 | Hexagon Head Bolts – Grades A & B | IS 1364 (Part 1):2018 |
| 5 | Hexagon Head Screws – Grades A & B | IS 1364 (Part 2):2018 |
| 6 | Indicating Bolts (Public Baths & Lavatories) | IS 4621:1975 |
| 7 | Flush Bolts | IS 5187:1972 |
| 8 | Step Bolts for Steel Structures | IS 10238:2001 |
| 9 | Transmission Tower Bolts | IS 12427:2001 |
| 10 | High Strength Structural Bolts | IS 3757:1985 |
| 11 | Tower Bolts – Non-Ferrous | IS 204 (Part 2):1992 |
| 12 | Tower Bolts – Ferrous | IS 204 (Part 1):1991 |
| 13 | Stainless Steel Aldrops | IS 15834:2022 |
| 14 | Non-Ferrous Aldrops | IS 2681:1993 |
| 15 | Mild Steel Aldrops | IS 281:2009 |
| 16 | Sliding Locking Bolts | IS 7534:1985 |
| 17 | Aluminium Alloy Bolt & Screw Stock | IS 1284:1975 |
| 18 | Stainless Steel Tower Bolts | IS 15833:2009 |
| 19 | High Strength Structural Nuts | IS 6623:2004 |
What Factory Owners Must Do Before March 2026 (Critical Actions)
This is where most blogs stop at theory. Let’s get practical.
1. Confirm Exact Applicability (Before Testing Anything)
Not every ISI Mark for Bolts, Nuts and Fasteners is covered the same way.
Factory owners must verify:
- Product category
- Grade (A, B, C)
- Size range
- End-use application
Testing the wrong variant is one of the most common (and costly) mistakes.
2. Align Factory Infrastructure with IS Requirements
BIS certification is not only product-based.
Inspectors check:
- Manufacturing flow
- Heat treatment processes
- In-house testing facilities
- Calibration records
- Raw material traceability
If your factory layout or process documents don’t match reality, approvals stall.
3. Prepare Documentation Before Application
Most ISI Mark for Bolts, Nuts and Fasteners rejections happen due to documentation mismatches, not failed tests.
Common issues:
- Factory address inconsistencies
- Incorrect standard referenced
- Product drawings not matching test samples
- Missing control plans
A BIS certification consultant typically audits this before filing, not after rejection.
4. Plan Testing & Timeline Backwards
As March 2026 approaches:
- BIS labs will get overloaded
- Scrutiny timelines will stretch
- Clarifications will increase
What Happens If You Skip ISI Mark for Bolts, Nuts and Fasteners?
- Sales without ISI Mark are illegal
- Import consignments can be detained
- Tenders may reject non-certified suppliers
- Re-testing costs escalate closer to deadlines
Compliance is no longer optional, it’s commercial survival
Role of a BIS ISI Mark Consultant (Beyond Filing Forms)
- Correct standard identification
- Pre-assessment of factory readiness
- Test report & documentation alignment
- Handling BIS queries and inspections
This reduces:
- Rejections
- Re-testing
- Unpredictable delays
Final Takeaway for Factory Owners
Manufacturers who:
- Understand applicability early
- Align factories and documentation
- Plan testing in advance
will stay compliant without panic or production loss.
Those who wait will learn compliance the hard way.
FAQs
From when will ISI Mark become compulsory for nuts and bolts?
Under the Bolts, Nuts and Fasteners (Quality Control) Order, 2023, mandatory ISI Mark requirements are enforced with phased deadlines, with March 2026 being a key compliance milestone for many manufacturers.
Can BIS reject an ISI Mark application even if the fasteners pass laboratory testing?
Yes. Passing testing alone does not guarantee ISI Mark approval. BIS commonly rejects applications due to:
- Incorrect standard selection
- Grade or size mismatch
- Factory layout inconsistencies
- Documentation not matching actual production
This is why many approvals fail at the scrutiny or inspection stage, not at testing.
Do manufacturers need separate ISI certification for different grades or size ranges?
Yes. ISI certification is granted for a defined product scope, which includes:
- Specific grades (A, B, or C)
- Defined size ranges
- Declared manufacturing process
If a manufacturer produces multiple grades or size ranges outside the approved scope, separate evaluation or extension of scope may be required.
What happens if fasteners are sold without ISI Mark after the mandatory deadline?
For notified fasteners: Sale without ISI Mark is illegal, Shipments may be stopped or rejected,
Manufacturers may face enforcement action under BIS regulations
