Standards-based
engineering, certified.
Built to international specification and inspected in-house, with the documentation procurement teams need to sign off.
ISO 9001:2015
A certified quality management system underpins every order, from material selection and process control to inspection and export documentation.
Engineered to international spec
Product is built and documented to the standards your specification calls out.
American Society for Testing & Materials
US material & coating specifications (e.g. A123 hot-dip galvanizing)
International Electrotechnical Commission
Global electrical infrastructure standards (e.g. 61537 cable management)
European Norms
European harmonised structural & electrical standards
Deutsches Institut für Normung
German engineering & dimensional standards
National Electrical Manufacturers Association
North American electrical product standards
British Standards
UK structural, electrical & testing standards
Indian Standards (BIS)
Indian material standards (e.g. IS 4759 galvanizing, IS 2713 gratings)
Tested before it ships.
We perform rigorous in-house dimensional audits, coating verification, and load tests. All results are logged against heat numbers and compiled into a signed Quality Assurance File.
- Dimensional inspection
- Coating-thickness measurement
- Salt-spray testing
- Material certification (MTC)
- Third-party inspection welcome
Surface Treatment
Hot-dip galvanizing (IS 4759, ASTM A123), electro-galvanizing, powder coating, and paint finishing — owned and controlled processes.
Inspection & Testing
Continuous dry film thickness (DFT) coating verification, salt-spray chambers, and calibrated micrometers. We welcome client-appointed third-party inspections (SGS, TUV, BV) at our Howrah works.
IS 2062 Gr. A Carbon Steel Chemical Limits
We verify all raw steel heats against IS 2062 parameters in our spectrometer lab to ensure optimal yield strength and weldability without embrittlement.
| Element | Symbol | Permissible Limit (Max) | Howrah Works Average |
|---|---|---|---|
| Carbon | C | 0.23% | 0.17% - 0.19% |
| Manganese | Mn | 1.50% | 1.10% - 1.25% |
| Phosphorus | P | 0.045% | 0.025% - 0.030% |
| Sulfur | S | 0.045% | 0.020% - 0.028% |
| Silicon | Si | 0.40% | 0.15% - 0.22% |
Hot-Dip Galvanizing Coating Thickness standards
Our zinc bath runs are calibrated based on material thickness to guarantee minimum micron protection under international corrosion standards.
| Standard | Application Range | Steel Thickness | Min Avg Micron |
|---|---|---|---|
| ASTM A123 | Structural Sections, Cable Trays | > 6.4 mm | 85 µm (600 g/m²) |
| ASTM A123 | Sheet Metal Channels, Struts | 1.6 - 3.2 mm | 65 µm (460 g/m²) |
| ASTM A153 | Threaded Rods, Fasteners, U-Bolts | All sizes | 43 - 53 µm (305-380 g/m²) |
| IS 4759 | General Fabricated Steel Articles | > 5.0 mm | 80 µm (560 g/m²) |
On zinc spangle
The bright crystal pattern (spangle) on a hot-dip surface varies with cooling rate and bath chemistry. Large or small spangle is cosmetic only, it has no effect on coating weight or corrosion life. We specify by micron thickness, not by appearance.
Rolled, not cut, rod threads
Threads on our copper-bonded earth rods are roll-formed, not machined. Rolling preserves the continuous steel grain and the copper bond across the thread, so the coupling stays as strong and as conductive as the rod itself.
Coating Adhesion (ASTM D3359 Cross-Hatch)
For powder-coated components, we execute standard lattice pattern cuts using a multi-blade cutter, apply pressure-sensitive tape, and verify zero coating flaking (Class 5B rating) to ensure no paint peel during site handling.
Salt-Spray Calibration (ASTM B117)
Our corrosion chambers are calibrated to run at 35°C (± 2°C) with a continuous atomized fog of 5% sodium chloride solution. We log rust-free hours to guarantee durability in marine C5 environment categories.
Mill Test Certificate (MTC EN 10204 3.1) Walkthrough
An EN 10204 3.1 Material Test Certificate is our guarantee of metallurgical traceability. Hover or review the core components below to understand how our engineering desk verifies chemical and mechanical authenticity:
VAJRA INTERNATIONAL
Howrah Works, West Bengal, India
MILL TEST CERTIFICATE (EN 10204 3.1)
Certificate No: VI/2026/MTC-718
Date of Issue: 2026-07-02
1. Customer Details
Client: Direct Infrastructure Contractor, UAE
Purchase Order No: PO-450099
2. Product Specifications
Material: Mild Steel IS 2062 Gr. A
Item: Ladder Cable Tray 600mm x 100mm x 2.0mm
3. Chemical Composition Analysis (Spectrometer Log)
| Heat No | C % | Mn % | P % | S % | Si % | Carbon Equivalent (CE) |
|---|---|---|---|---|---|---|
| HT-26280 | 0.18 | 1.21 | 0.026 | 0.022 | 0.18 | 0.38 (Max Limit: 0.42) |
*Explanation: The Carbon Equivalent (CE) formula [C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15] is verified under 0.42 to guarantee clean, cracking-free welding during site installation.
4. Mechanical Performance Verification (Tensile Pull Log)
| Sample ID | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Bending Test (180°) | Hardness (HRB) |
|---|---|---|---|---|---|
| SMP-718 | 285 (Required Min: 250) | 440 (Required: 410-540) | 26% (Required Min: 23%) | PASS (No crack) | 78 |
*Explanation: Elongation above 23% ensures the cable tray side rails form cleanly on press-forming dies without localized metallurgical micro-tears.
Certification Standard: EN 10204 Type 3.1
We certify that the material conforms to specification IS 2062:2011.
QA APPROVED
CHIEF METALLURGIST
VAJRA HOWRAH WORKS
Compliance, answered
Vajra operates an ISO 9001:2015 certified quality management system, with standards-based engineering across ASTM, IEC, EN, DIN, NEMA, BS and IS specifications.
Dimensional inspection, coating-thickness measurement, salt-spray testing and material certification are performed in-house. Third-party inspection is welcome.
Yes. Material Test Certificates (MTC) and inspection reports are prepared as standard, with batch and heat traceability for controlled and defence-grade work.
Mild steel, structural steel (IS 2062), stainless steel (304/316), aluminium, electrolytic copper and brass, selected and certified to application.
Standards-based engineering across ASTM, IEC, EN, DIN, NEMA, BS and IS, including IS 4759 / ASTM A123 galvanizing, IS 2713 gratings, and IEC 61537 / IS 12352 cable management.
Pre-galvanized (PG) sheet has zinc applied to the coil before fabrication, every cut edge, punch hole and weld made afterward exposes bare steel with zero zinc coverage. Hot-dip galvanizing (HDG) is applied after full fabrication: the finished part is immersed in molten zinc at 445–455°C, forming four intermetallic zinc-iron bonding layers on every surface including welds, cut edges and internal corners. HDG to ASTM A123 produces 85–110 µm average coating; PG Z275 produces 19 µm per side. Outdoors, HDG provides 25–40 year service; PG shows red rust at cut edges within 18–24 months in humid or coastal conditions. Vajra owns an in-house HDG bath and XRF-verifies every production batch.
Need certificates with your quote?
MTC, COO and inspection reports are prepared as standard. Send your specification and required standards, they'll be reflected in the quotation.
- MTC · COO · inspection reports
- ±0.01 mm precision · in-house QA
- FOB · CIF · CFR to all major ports