TCR Engineering Becomes India's First Commercial Lab Recognised by BIS for IS 16172 Rebar Coupler Testing

Among commercial laboratories in India, TCR Engineering is the first recognised by the Bureau of Indian Standards to test rebar couplers to IS 16172:2023 (LRMD/LRS/OSL-7103506) at its Mahape laboratory in Navi Mumbai. It tests couplers for 8 mm to 40 mm bars for tensile strength, slip, cyclic tensile and low and high cycle fatigue, within its NABL scope (NABLT0726MH18640).

• Standard: IS 16172:2023, Reinforcement Couplers for Mechanical Splices of Steel Bars in Concrete
• Recognition: BIS laboratory recognition LRMD/LRS/OSL-7103506, valid to 31 December 2026
• Bar diameters: 8 mm to 40 mm
• Accreditation: IS 16172 tensile, slip, cyclic tensile and fatigue tests on NABL certificate NABLT0726MH18640

IS 16172 rebar coupler testing in India just reached a new milestone, and it happened quietly, the way most things in quality assurance do.

The Bureau of Indian Standards has expanded TCR Engineering's recognition scope to include complete testing as per IS 16172:2023, the Indian Standard for Reinforcement Couplers for Mechanical Splices of Steel Bars in Concrete. TCR is now the first commercial laboratory in India to hold this recognition.

For coupler manufacturers, infrastructure project owners, and procurement teams sourcing mechanical splices for critical structures, this matters. It means there is now an independent, NABL-accredited, BIS-recognised facility that can test rebar couplers to the full requirements of IS 16172, and issue results that carry regulatory weight.

What IS 16172:2023 Actually Requires

IS 16172 governs the performance of mechanical splices used to join reinforcement bars in concrete structures. These couplers are not decorative components. They carry the same tensile and fatigue load as the rebar itself, and in seismic zones, in high-rise frames, or in critical infrastructure like elevated rail corridors, failure at a splice joint is not a recoverable situation.

The standard covers a complete range of tests, and TCR's recognised scope covers couplers for bar diameters from 8 mm to 40 mm. The testing scope TCR is now recognised for under BIS includes:

• Tensile Strength (Clause 9.2.1), verifying that the coupler assembly meets minimum tensile requirements for its rebar diameter
• Disengagement Test for Threaded Couplers (Clause 9.2.1.1), confirming that threaded connections do not separate under load
• Percentage Elongation (Clause 9.2.2), measuring ductility of the splice assembly
• Slip Test (Clause 9.3), testing relative movement between bar and coupler under load, conducted on sets of three specimens
• Cyclic Tensile Test (Clause 9.4), subjecting couplers to repeated loading cycles, simulating real dynamic stress conditions
• Low Cycle Fatigue Test (Clause 9.5.1), high-amplitude, low-frequency loading representative of seismic or sudden impact conditions
• High Cycle Fatigue Test (Clause 9.5.2), sustained cyclic loading over extended periods, relevant to infrastructure carrying live traffic or wind loads

The fatigue tests, particularly high cycle fatigue, are the most demanding. Running specimens up to 40 mm through the full high cycle protocol calls for a dedicated fatigue set-up. TCR's dedicated coupler and rebar fatigue testing facility has been built specifically for this class of testing.

Why This Recognition Was Worth Pursuing

India's construction sector has been scaling rapidly, and the standards infrastructure around it has had to keep pace. The BIS recognition for IS 16172 closes a gap that coupler manufacturers have faced for years, the absence of an independent, commercially accessible lab that could run the full test suite and issue results recognised by BIS, project consultants, and government clients.

Seema Rajpure, Head of Quality Assurance at TCR Engineering, describes what this recognition represents operationally:

"Holding BIS accreditation for IS 16172 means that every test we run on a rebar coupler is traceable, standardised, and independently verifiable. For manufacturers seeking BIS certification for their products, and for project owners who need third-party validation, we can now be that single qualified source in the commercial laboratory space."

That confidence comes from the infrastructure behind it. TCR's lab operates under ISO 17025 and NABL accreditation, with quality systems governed by the same rigour applied to its mechanical testing and fatigue and fracture toughness work for defence, oil and gas, and infrastructure clients.

Hemant Sakpal and the Industry Work Behind the Recognition

Recognitions like this do not happen in isolation. They require sustained engagement with industry, understanding what manufacturers need, what project specifications demand, and where the gaps in the testing ecosystem actually sit.

Hemant Sakpal, Business Development Manager at TCR Engineering, was instrumental in driving this recognition forward and helping manufacturers get their product ISI-ready. His work with rebar and coupler manufacturers across India identified IS 16172 as a critical gap in the commercially available testing market, and he led the business-side effort to close it.

"Coupler manufacturers have been asking for a reliable, accredited facility to test IS 16172 for some time. Our clients needed results they could take to BIS, to project owners, and to international buyers. Now they have that option."

Hemant's current work also includes projects at the intersection of infrastructure ambition and coupler performance. TCR is approved for testing on India's high speed rail project, where mechanical splices are a critical structural element and testing documentation requirements are stringent. He also works with manufacturers who test their products to ISO 15630-1, serving export and international compliance requirements alongside domestic IS standards.

For international manufacturers or suppliers looking to demonstrate compliance with Indian standards as part of a third-party inspection process for imported construction materials, TCR's BIS recognition adds another layer of credibility to the test results.

TCR as a BIS Recognised Laboratory

TCR Engineering is a BIS Recognised Laboratory. Its full, current scope of BIS recognition is published and publicly verifiable at https://lims.bis.gov.in/home_lab_scope/253/.

BIS, the Bureau of Indian Standards, is India's national standards body, established under the BIS Act 2016 and operating as the successor to the Indian Standards Institution. Its mandate covers the harmonised development of standardisation, conformity assessment, and quality assurance across goods, processes, systems, and services. A BIS-recognised laboratory designation means the lab has been evaluated and approved by BIS to conduct testing in support of product certification and compliance under Indian Standards.

For procurement teams, project owners, and quality managers, BIS recognition is the meaningful marker. It is what allows test results to feed directly into the BIS product certification process.

Beyond IS 16172, TCR's BIS-recognised scope includes testing across a wide range of Indian Standards:

• IS 1786:2008: High strength deformed steel bars and wires for concrete reinforcement
• IS 16651:2017: High strength deformed stainless steel bars and wires for concrete reinforcement
• IS 2062:2011: Hot rolled medium and high tensile structural steel
• IS 513 (Parts 1 and 2):2016: Cold reduced carbon steel sheet and strip
• IS 1079:2017: Hot rolled carbon steel sheet, plate and strip
• IS 3589:2001: Steel pipes for water and sewage
• IS 17875:2022: Stainless steel seamless pipes and tubes for general service
• IS 17876:2022: Stainless steel welded pipes and tubes for general service
• IS 15103:2002: Fire resistant steel
• IS 2501:1995: Solid drawn copper tubes for general engineering purposes
• IS 10773:1995: Wrought copper tubes for refrigeration and air conditioning
• IS 277:2018: Galvanised steel strips and sheets
• IS 21:1992: Wrought aluminium and aluminium alloys for manufacture of utensils
• IS 814:2004: Covered electrodes for manual metal arc welding of carbon and carbon manganese steel
• IS 1395:1982: Low and medium alloy steel covered electrodes for manual metal arc welding
• IS 2879:1998: Mild steel for metal arc welding electrodes
• IS 15769:2008: Flux cored electrodes for gas shielded and self-shielded metal welding

This breadth makes TCR a practical choice for manufacturers seeking BIS product certification across steel, aluminium, copper, and welding consumable categories, particularly those looking for a single recognised facility to consolidate their testing requirements.

The Role of Couplers in Modern Infrastructure

Rebar couplers are not a recent innovation, but their use in Indian construction has expanded significantly as project complexity has grown. High-rise residential structures, metro rail viaducts, cable-stayed bridges, tunnels, and elevated highway corridors all carry conditions where lapping bars is either impractical or structurally inefficient. In congested reinforcement layouts, a mechanical splice makes construction faster and cleaner. In seismic design, it can mean the difference between a joint that holds and one that doesn't.

TCR has covered this in depth in its earlier technical piece on rebar coupler performance testing, including how the choice of test protocol affects what you actually learn about a coupler's behaviour under realistic loading.

The addition of IS 16172 to its BIS recognition now allows TCR to serve manufacturers and project teams whose specifications reference this Indian Standard directly, whether for domestic supply, BIS certification applications, or imported coupler products requiring third-party inspection before use on Indian projects.

Testing Rebar to IS 1786 Alongside Coupler Testing

Many coupler qualification programmes also require concurrent rebar testing. The coupler is only as meaningful as the bar it joins. TCR holds BIS recognition for IS 1786:2008 and runs TMT rebar and coupler testing as part of an integrated qualification programme, covering tensile, bend, rebend, and fatigue requirements in a single facility visit.

This combined capability is particularly relevant for rebar coupler manufacturers seeking BIS product certification, where both the coupler and the rebar assembly may need to be tested together.

IS 16172 Rebar Coupler Testing at TCR

For manufacturers or project teams looking to initiate IS 16172 testing, TCR's team can advise on specimen preparation, sample size requirements, and the test sequence appropriate to your specific coupler type and diameter. TCR's sample size requirements are documented and available at the downloads section.

Enquiries can be directed to sales@tcreng.com or via phone at +91-9833530200. The lab is located at VKB House, Mahape, Navi Mumbai, and operates Monday to Saturday.

As India builds faster and taller, IS 16172 rebar coupler testing is one of the quiet enablers behind structures that are expected to perform for decades.

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This article was written and edited by the TCR Newsroom, the editorial desk of the TCR group, covering materials testing, inspection and asset integrity work across TCR’s laboratories in India and Saudi Arabia and its alliances in Qatar, Japan and beyond.