Menu

DIPTI METAL INDUSTRIES

header photo

ISO 4033 Heavy Hex Nut Manufacturer, Exporter & Supplier India

ISO 4033 Manufacturer, Exporter, Supplier, Stockist & Dealer

Dipti Metal Industries, established in 2009 by Mr. Kumpsingh Rajput in Mumbai, India, is a leading ISO 4033 Manufacturer, Exporter, Supplier, Stockist, and Dealer. With strong expertise in supplying to oil & gas, petrochemical, valve, and power generation industries, we deliver heavy hex nuts (H=D) in a wide range of materials, coatings, and sizes.

We are certified to ISO 9001, ISO 14001, ISO 45001, and PED 2014/68/EU, ensuring strict adherence to global quality and safety standards.

What is ISO 4033?

ISO 4033 specifies heavy hexagon nuts (style H=D) with metric coarse pitch threads. These nuts are primarily used with stud bolts in high-temperature, high-pressure, and corrosive applications such as oil & gas, petrochemical plants, and power generation.

  • Standards: DIN 13, ISO 965

  • Equivalent Norms: DIN 934 H=D

  • Certifications: EN 10269, PED 2014/68EU, AD 2000 Merkblatt, EN 10204-3.1/3.2, NACE MR0175

Materials & Grades

We stock and supply ISO 4033 Heavy Hex Nuts in various material grades to meet diverse industry demands:

  • Carbon & Alloy Steels

    • SA 194 – Gr.2H, Gr.4, Gr.7, Gr.16 (M12 – M64)

    • SA 194 – Gr.2HM, Gr.7M (NACE conforming, M12 – M30)

    • SA 194 – Gr.8, 8M, 8T (M12 – M30)

    • SA 540 for high-strength bolting

  • Special Steels

    • 1.7218 / 25CrMo4+QT (KG) – M12 – M30

    • 1.7225 / 42CrMo4+QT (GC)

    • 1.7709 / 21CrMoV5-7+QT (GA)

    • 1.4913 / X19CrMoNbVN11-1+QT (VW)

    • 1.4923 / X22CrMoV12-1+QT (V/VH) – M12 – M30

    • 1.4980 / X6NiCrTiMoVB25-15-2+QT (SD)

    • 1.4986 / X7CrNiMoBNb16-16 (SD)

    • 1.7729 / 20CrMoVTiB4-10 (Durehete 1055, Alloy T41)

  • Nickel Alloys & Superalloys

    • ASTM A 453 Gr.660 Class A/B/C/D

    • Inconel 625 / 2.4856

    • Inconel 718 / 2.4668

    • Alloy 825

Coatings & Finishes

Our ISO 4033 heavy hex nuts are available with multiple coatings for durability and corrosion resistance:

  • Hot Dip Galvanised (HDG – oversize available in stock)

  • Zinc Plated (Trivalent & Hexavalent)

  • Black Oxide / Blackened

  • Nickel Plated

  • Chrome Plated

  • Cadmium Plated

  • Zinc-Nickel Alloy Coated

  • PTFE / Teflon Coated

  • Phosphate Coated (Manganese & Zinc)

  • Organic Coatings (Xylan, Geomet, Dacromet)

  • Self-Colour (as processed)

Stock Range

  • Standard stock: M8 – M64 (coarse thread)

  • Fine thread: M33 – M64 on request

  • Oversize hot-dip galvanised nuts available

  • Immediate dispatch with EN 10204 3.1 / 3.2 certification

Technical Dimensions (Extract)

Thread (d) Across Flats (e) min Width (s) Height (m)
M814.3812.73 – 13.007.14 – 7.50
M1017.7715.73 – 16.008.94 – 9.30
M1220.0317.73 – 18.0011.57 – 12.00
M1423.3620.67 – 21.0013.40 – 14.10
M1626.7523.67 – 24.0015.70 – 16.40
M2032.9529.16 – 30.0019.00 – 20.30
M2439.5535.00 – 36.0022.60 – 23.90
M3050.8545.00 – 46.0027.30 – 28.60
M3660.7953.80 – 55.0033.10 – 34.70

(Full size chart available on request)

Applications

  • Oil & Gas Industry – refineries, pipelines, offshore platforms

  • Petrochemical Plants – high-temperature and high-pressure units

  • Valve Industry – pressure-rated and sour-service applications

  • Power Generation – turbines, boilers, pressure vessels

  • Marine & Offshore – corrosion-prone environments

  • General Engineering – heavy-duty fastening assemblies

Certifications

Dipti Metal Industries supplies ISO 4033 heavy hex nuts with the following certifications:

  • ✅ ISO 9001:2015 – Quality Management

  • ✅ ISO 14001:2015 – Environmental Management

  • ✅ ISO 45001:2018 – Occupational Health & Safety

  • ✅ PED 2014/68/EU Certified

  • ✅ EN 10269 – Heat-resistant steels

  • ✅ EN 10204 3.1 / 3.2 Certification

  • ✅ NACE MR0175 Compliance

Global Export Network

We are a trusted ISO 4033 Manufacturer & Exporter from India, delivering worldwide:

  • Europe: Germany, Italy, France, UK, Spain, Netherlands, Poland

  • North America: USA, Canada, Mexico

  • South America: Brazil, Argentina, Chile, Colombia

  • Asia: UAE, Saudi Arabia, Qatar, Singapore, Japan, South Korea

  • Africa: South Africa, Egypt, Nigeria, Kenya

Country of Origin: India
Main Ports: Nhava Sheva (JNPT Mumbai), Mundra, Chennai, Hazira, Kolkata

Why Choose Dipti Metal Industries?

  • 🌍 Over 15 years’ experience in global fastener supply

  • 🏭 Specialized in petrochemical, valve, and oil & gas industries

  • 📦 Large stock availability with fast dispatch

  • 📜 ISO, PED, and NACE certified products

  • 🔍 Independent third-party inspection (SGS, TUV, BV, DNV)

  • 🚢 Export-grade packaging & custom branding

Contact Us