At Surya Engineering, we manufacture and supply high-strength EN8D mechanical rebar couplers engineered for heavy infrastructure and structural concrete construction, supporting sizes from 16mm to 40mm TMT bars. To explore our complete range of design specifications, browse our primary Rebar Couplers Product Page. We deliver precision-engineered parallel-threaded and MBT configurations fully compliant with IS 16172 standards.
Operating directly from Mira Road, Thane, we provide rapid commercial logistics—offering same-day dispatch and delivery across Thane and Navi Mumbai, and 24-hour delivery across Mumbai. Contact our sales and technical team today with your bar size, order volume, and material test report (MTR) requirements to secure project-ready pricing and immediate stock availability.
Verify outer diameter, total sleeve length, unit weight, and specified material grades across our complete 16mm to 40mm production line.
| TMT Bar Size | Coupler Outer Diameter | Coupler Length | Weight per Coupler | Specified Material |
|---|---|---|---|---|
| 16mm | 25mm | 40mm | 0.09kg | EN8D |
| 20mm | 32mm | 48mm | 0.16kg | EN8D |
| 25mm | 40mm | 50mm | 0.32kg | EN8D |
| 32mm | 50mm | 64mm | 0.58kg | EN8D |
| 36mm | 56mm | 72mm | 0.90kg | EN8D |
| 40mm | 63mm | 80mm | 1.13kg | EN8D |
We supply commercial-grade parallel-threaded and MBT rebar couplers built to satisfy strict structural requirements. The ideal connection type depends on your project specifications, bar-end preparation methods, and site installation needs.
Engineered by us to connect reinforcing bars through high-precision internal matching threads. Consistent thread pitch, correct engagement length, and proper bar preparation ensure maximum load transfer and structural continuity.
Provided by our team to offer an efficient mechanical connection alternative for specialized reinforcement applications. Verify your exact model designations, compatible bar diameters, and installation instructions against your structural drawings.
We maintain strict material traceability and quality compliance. Our comprehensive documentation packages give procurement teams and quality control (QC) engineers absolute transparency into material composition, test results, and inspection standards.
| Document | Issuing Organisation | Report or Document Reference | Date | Test or Record |
|---|---|---|---|---|
| Chemical analysis of 32mm EN-8D coupler | Global Lab | VST-35022-TR-875098; ULR TC571326000010654F | 7 April 2026 | Chemical composition of submitted sample |
| Chemical test of 20mm EN8D coupler | Element Materials Technology | 2210380-14 | 2 December 2022 | Chemical analysis with Fe 500D bar identified in the report |
| Raw-material test certificate | Rashtriya Ispat Nigam Limited, Visakhapatnam Steel Plant, Quality Assurance & Technology Development Department | QMS/R/QAD/RM/45/P/2021-22/9530/00101901 | 11 February 2022 | Raw-material documentation under IS 1875:1992 |
| Thread inspection | Surya Engineering document | SE/07, Revision 00 | 1 February 2022 | Thread-size and thread-length inspection procedure |
| Static tensile test, 16mm assembly | Element Materials Technology | 2210380-1 | 2 December 2022 | Tensile strength, elongation and failure location |
| Static tensile test, 25mm assembly | Element Materials Technology | 2210380-12 | 2 December 2022 | Tensile strength, elongation and failure location |
| Static tensile test, 32mm assembly | Element Materials Technology | 2210380-11 | 2 December 2022 | Tensile strength, elongation and failure location |
| Slip test, 32mm assembly | TCR Engineering Services | Refer to supplied report | Report date to be checked against original | Slip, ultimate tensile strength and failure location |
| Low-cycle fatigue test, 32mm assembly | TCR Engineering Services | Refer to supplied report | 31 October 2023 | Fatigue cycles and tensile strength after cycling |
| Element | Reported Result | Reference Limit or Range in Report |
|---|---|---|
| Carbon (C) | 0.438% | 0.40–0.45% |
| Manganese (Mn) | 0.732% | 0.70–0.90% |
| Sulphur (S) | 0.0085% | Maximum 0.05% |
| Silicon (Si) | 0.277% | 0.10–0.40% |
| Phosphorus (P) | 0.0154% | Maximum 0.05% |
The Element Materials Technology chemical report records the following parameters for our 20mm EN8D coupler sample used alongside a Fe 500D bar, verifying conformity with BS 970:1955 Grade EN8.
| Element | Reported Result |
|---|---|
| Carbon (C) | 0.37% |
| Manganese (Mn) | 0.89% |
| Silicon (Si) | 0.31% |
| Sulphur (S) | 0.022% |
| Phosphorus (P) | 0.030% |
Static tensile testing validates the ultimate load performance of our mechanical splice assemblies under heavy commercial loads. Supplied reports from Element Materials Technology document rigorous testing of our 16mm, 25mm, and 32mm assemblies utilizing our EN8D couplers with Fe 500D TMT reinforcing bars.
| Test Parameter | 16mm Assembly | 25mm Assembly | 32mm Assembly |
|---|---|---|---|
| Ultimate load | 137.80 kN | 358.70 kN | 590.80 kN |
| Tensile strength | 685.35 MPa | 730.75 MPa | 734.60 MPa |
| Elongation | 3.75% | 7.60% | 3.44% |
| Reported failure location | TMT bar, 236mm from coupler centre | TMT bar, 90mm from coupler centre | TMT bar, 214mm from coupler centre |
| Report reference | 2210380-1 | 2210380-12 | 2210380-11 |
Bar-Break Safety Confirmation: All three reports (dated 2 December 2022) confirm superior structural safety, with ultimate failure occurring within the parent TMT bar rather than our coupler sleeve. Our 16mm specimen comfortably exceeded its minimum criteria. Your project teams can review full reports during material approval workflows.
| Test Parameter | Reported Result |
|---|---|
| Reinforcing bar size | 32mm |
| Standard referenced | IS 16172:2014 |
| Total slip | 0.093 mm |
| Maximum slip limit stated in report | 0.10 mm |
| Ultimate tensile strength | 671.50 MPa |
| Ultimate load | 540,290 N |
| Failure location | Outside the mechanical splice length |
| Test Parameter | Reported Result |
|---|---|
| Reinforcing bar size | 32mm |
| Coupler material | EN8D |
| Reinforcing bar grade | Fe 550D |
| Standard referenced | IS 16172:2014, Amendment 1:2019 |
| Required cycles | 10,000 |
| Cycles sustained | 10,000 |
| Failure during required cycles | No failure reported |
| Tensile strength after cycling | 649.51 MPa |
| Failure location | Outside the mechanical splice length |
Our specimen successfully completed all 10,000 cycles without structural failure, delivering high post-cycling tensile strength and field reliability.
| Bar Size | Thread Size in Inspection Record | Thread Pitch in Product Specification | Thread Engagement in Product Specification |
|---|---|---|---|
| 16mm | M18 × 2.0 | 2.5 mm | 20 × 2.5 |
| 20mm | M23 × 2.5 | 3.0 mm | 24 × 3 |
| 25mm | M29 × 3.0 | 3.0 mm | 29 × 3 |
| 32mm | M36 × 4.0 | 4.0 mm | 36 × 4 |
| 36mm | M39 × 4.0 | 4.0 mm | 40 × 4 |
| 40mm | M43 × 4.0 | 4.5 mm | 45 × 4.5 |
Operating strategically from Mira Road, Thane, we deliver dependable logistics management across the Mumbai Metropolitan Region to match your tight concrete pouring schedules.
Plot 3, SANSTONE BUILDING, KANAKIYA ROAD, MIRA ROAD, Thane, Maharashtra 401107.
We provide specialized commercial site support across Mumbai to help you eliminate operational bottlenecks:
Our manufacturing standards, supply records, and technical documentation align with the rigorous quality approvals demanded by leading contractors across prominent national infrastructure developments:
| Project / Infrastructure Development | Associated Contractor & Scope Details |
|---|---|
| Sitco / Navi Mumbai Metro | Supplied for reinforcement work executed in collaboration with NCC on the Navi Mumbai Metro project. |
| Bengaluru Metro | Mechanical rebar equipment and coupler solutions installed in coordination with URC Construction and ITD Cementation. |
| Mumbai Metro, Bandra | Specialized reinforcement supply executed in partnership with ITD Cementation for the Bandra Metro project. |
| Arvinal Railway | Approved material application supplied for railway infrastructure development (subject to final project record verification). |
| GPT Infra | Specialized structural rebar components supplied for GPT Infra infrastructure developments. |
To secure competitive bulk pricing, trade terms, and immediate stock verification from us, provide your project details below:
Fill out the form below to receive immediate quotation and stock availability.
16mm to 40mm · EN8D Grade · Parallel Threaded & MBT · Tested to IS 16172 · Rapid Mumbai Delivery
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