Carbon Steel Butterfly Spring Toggle Anchor Bolts
- Material: Carbon Steel Q235 / Class 4.8-8.8
- Coating: White Zinc, Yellow Chromate, Dacromet
- Application: Cavity Walls, Suspended Ceilings
From cryo-treated ASTM A193/A320 stud bolts to precision toggle assemblies and forged pipe components, browse our high-demand fasteners engineered for Eurasian harsh-climate requirements.
Operating from our accredited manufacturing facility in Mumbai, Viha Steel & Forging bridges Western technical specifications (ASTM, DIN, ISO, EN) with GOST standards, deploying verified metallurgy designed to withstand Arctic cold shocks, saline maritime winds, and vibration strain.
Structural bolts and studs destined for northern Russian hubs (such as Yamal, Novy Urengoy, and Norilsk) encounter ambient drops to -60°C. Standard commercial carbon steels turn brittle below -20°C, leading to brittle cleavages. We melt and refine specialized alloy compositions (ASTM A320 L7/L7M, 40Kh, and 09G2S equivalents) validated via Charpy V-Notch testing down to -101°C, guaranteeing impact resistance >27 Joules.
Every shipment of high-tensile bolts, heavy hex nuts, and forged stub-ends passes strict metallurgical checkpoints: Spectral Chemical Analysis, Optical Brinell/Rockwell Hardness mapping, Tensile Proof-Load Stress confirmation, and Non-Destructive Testing (MPI & Ultrasonic). Our shipments arrive with original 3.1 Mill Test Certificates (MTC) detailing complete chemical ladle and heat traceability.
As the 3rd largest hot-dip galvanized fasteners exporter from India, our micro-centrifuged spin galvanizing lines apply uniform, ultra-adherent zinc jackets (50µm–85µm) exceeding ISO 1461 and ASTM A153. For offshore Arctic drilling and aggressive H2S environments, we apply Xylan® / PTFE fluoropolymer coatings resistant to thousands of hours of salt spray testing without seizing or thread galling.
Meeting the structural, thermal, and chemical stress boundaries demanded by Russian heavy enterprise, petrochemical networks, and permafrost infrastructure.
Liquefied Natural Gas liquefaction trains, cryogenic storage tanks, and natural gas transmission lines in Western Siberia and Sakhalin require bolting assemblies impervious to cyclic thermal contraction. Our stud bolts in ASTM A193 B7/B8M paired with ASTM A194 Class 8M heavy nuts prevent micro-channel leakages across ASME B16.5 and GOST 33259 flanges under cryogenic shock down to -196°C.
In coal excavation pits, potash processing facilities, and metallurgical blast furnaces across Chelyabinsk and Kemerovo, heavy vibrating machinery demands fastener property classes 10.9 and 12.9 with supreme yield strength (>900–1080 MPa). We supply rolled-thread heavy structural studs, SAE high-pressure locking flange couplings, and case-hardened washers (200HV–300HV) engineered to counter vibrational shear loosening.
Modernization along the Baikal-Amur Mainline (BAM) and heavy bridge networks requires pre-loadable structural bolt sets comparable to EN 14399-4 HV and GOST R 52644 (high-strength steel grade 40Kh Select). The controlled friction co-efficiency, hot-dip zinc coverage, and matched nut/washer hardness prevents shear failure caused by extreme seasonal temperature differentials (+35°C summer to -50°C winter).
High-temperature hydrocracking units and thermal power installations in European Russia rely on chromium-molybdenum bolting (ASTM A193 B16, A193 B7, and 25Kh1MF/30KhMA equivalents) capable of operating up to +540°C without significant creep relaxation or loss of joint gasket seating compression.
Ice-class commercial hulls, nuclear icebreaker support structures, and port handling infrastructure in Murmansk and Vladivostok mandate saltwater-resistant fasteners. We provide AISI 316, Cu-Ni, Silicon Bronze, and Phosphor Bronze bolting that resists severe pitting corrosion and galvanic marine erosion.
From chemical batch reactors to dairy and beverage processors in Moscow and Leningrad Oblast, our mirror-polished sanitary threaded flanges and micro-turned stainless fasteners (AISI 304/316L) provide zero-porosity finishes, eliminating bacterial retention points and resisting aggressive caustic washdowns.
Facilitating seamless import substitution and cross-standard EPC project execution with direct metallurgical equivalence.
| Product / Material Category | International Standard (ASTM / DIN / ISO) | Russian GOST Reference | Steel Grade / Alloy Equivalence | Tensile Strength (Min. MPa) | Operating Temperature Limits |
|---|---|---|---|---|---|
| Alloy High-Tensile Studs | ASTM A193 B7 / DIN 976 Class 10.9 | GOST 20700 / GOST 10495 | AISI 4140 ↔ 40Kh / 38KhMA | 860 – 1000 MPa | -40°C to +450°C |
| Arctic Low-Temp Bolting | ASTM A320 L7 / L7M | GOST 20700 (Climatic Execution KhL) | AISI 4140 Quenched & Tempered (CVN @ -101°C) | 860 MPa (Class 10.9) | -101°C to +200°C |
| Preloaded Structural Sets | EN 14399-4 (HV) / ASTM A325 | GOST R 52644 / GOST 22353 | Steel 40Kh "Select" / 30KhGSA | 1000 – 1200 MPa | -60°C to +150°C |
| Austenitic Stainless Bolts | ISO 3506-1 A2-70 / A4-80 (SS304/SS316) | GOST 7798 / GOST 5915 | AISI 304 ↔ 08Kh18N10 / AISI 316 ↔ 08Kh17N13M2 | 700 – 800 MPa | -196°C to +400°C |
| Heavy Hex Nut Assemblies | ASTM A194 Gr. 2H / DIN 934 Cl. 10 | GOST 5915 / GOST 10605 | Medium Carbon 1045 ↔ Steel 45 / 35Kh | Proof Stress: 1200 MPa | -50°C to +450°C |
| High-Duty Pipe Flanges | ASME B16.5 / EN 1092-1 Type 01/11 | GOST 33259-2015 (Types 01 to 11) | A105 ↔ Steel 20 / A350 LF2 ↔ 09G2S | 485 – 650 MPa | -60°C to +400°C (09G2S) |
An overview of changing supply corridors, currency settlement frameworks, and certification standards governing industrial procurement across the CIS region.
Disruptions in legacy Western European logistics corridors have made the International North-South Transport Corridor (INSTC)—connecting Mumbai to Bandar Abbas, Rasht, Astrakhan, and Moscow—the fastest, most cost-efficient route for high-volume fastener shipments. Transit times to Russian industrial hubs have been reduced to 20–25 days, bypassing European transshipment choke points.
Modern Russian corporate buyers face transaction barriers with USD and EUR wires. Direct Rupee-Ruble bilateral clearing accounts (Vostro mechanism), along with Chinese Yuan cross-border processing, enable friction-free, compliant settlements for continuous raw material and finished component orders without exchange freezes.
Industrial buyers in the EAEU customs bloc increasingly require comprehensive documentation beyond standard commercial invoices. High-stress bolting and pressure flanges must comply with TR CU 032/2013 (Equipment for Pressure Infrastructure) and TR CU 010/2011 (Machinery Safety). Our testing protocols and documentation packages align with these regulatory safety mandates.
Practical technical, metallurgical, logistics, and trade answers compiled by our export sales desk.
For Russian 09G2S (widely specified for low-temperature toughness down to -70°C), we supply ASTM A320 Grade L7 or Normalized ASTM A350 LF2 forgings. For high-tensile 40Kh structural bolting, we manufacture alloy assemblies to ASTM A193 B7 or ISO 898-1 Class 10.9/12.9 with matched chemical balance and CVN impact qualification.
Yes. In addition to standard metric coarse threads (6g/6H) and imperial UNC/UNF/8-UN series, our automated thread rolling and CNC lathe departments produce custom pitch diameters, left-hand threads, metric fine threads (GOST 8724 / 9150), and custom lead angles specified in technical drawings.
Every production lot is accompanied by a certified EN 10204 3.1 Inspection Certificate traceable to raw billet heat numbers. This includes quantitative Optical Emission Spectrometry (OES), yield/tensile test curves, elongation and reduction percentages, Brinell/Rockwell hardness test results, and Charpy impact data.
For fasteners with a hardness above 320 HV (Property Classes 10.9, 12.9, ASTM A193 B7), acid pickling is closely managed and de-embrittlement baking at 200°C–230°C for 4 to 24 hours is initiated immediately after plating, per ASTM F1941/ISO 9588 standards.
We ship via direct routes to St. Petersburg or through the INSTC trade corridor to Bandar Abbas and Astrakhan. Fasteners are sealed with anti-corrosion VCI volatile rust-inhibitor paper, secured in waterproof polymer bags inside wooden crates (ISPM-15 heat-treated), and metal banded to survive ocean moisture and cold-weather storage.
Supported by cold heading presses up to M30, hot forging hammers handling sizes up to M100, and multi-axis CNC centers, we manufacture custom fasteners, specialty toggle anchors, square neck bolts, forged SAE flange rings, and stub-ends strictly matching CAD/DWG drawings and specialized metallurgical formulations.