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ISO4033
GYF
Our Heavy Hex Nut 2HM HDG is a premium industrial fastener engineered to meet stringent ASTM A194 2HM standard specifications, purpose-built for high-pressure, high-temperature, and heavy-load fastening applications. Finished with industry-leading hot dip galvanized (HDG) coating, this heavy hex nut delivers exceptional long-term corrosion protection, making it the ideal choice for industrial buyers and bulk procurement clients operating in harsh outdoor and corrosive operating environments. With a thicker, heavier wall construction than standard hex nuts, our 2HM HDG heavy hex nuts provide superior clamping force and load distribution, eliminating thread stripping or fastener failure risks in critical structural and industrial assemblies. We adhere to global manufacturing and quality control standards, ensuring every batch delivers consistent performance and full compliance with international industrial fastening requirements.
Our Heavy Hex Nut 2HM HDG features a full hot dip galvanized coating that forms a robust metallurgical bond with the base carbon steel, delivering comprehensive barrier and cathodic protection against rust, oxidation, and chemical corrosion. This finish is optimized for outdoor, coastal, and chemically exposed applications, extending assembly service life by up to 10× that of standard zinc-plated fasteners.
Manufactured to fully meet ASTM A194 Grade 2HM specifications, our heavy hex nuts are designed for pairing with high-strength ASTM A193 B7 and B16 bolts in high-pressure and high-temperature systems. Each nut undergoes rigorous hardness and tensile testing to ensure it meets required mechanical properties for critical industrial service.
Every Heavy Hex Nut 2HM HDG features precision rolled UN/UNC/UNF threads with tight tolerance control, ensuring a smooth, consistent fit with mating bolts. This precision threading delivers uniform clamping force across full thread engagement, reducing loosening risks under vibration and dynamic load conditions.
Parameter | Specification |
Governing Standard | ASTM A194 Grade 2HM |
Base Material | Carbon Steel (AISI 1018/1020/1045) |
Surface Finish | Hot Dip Galvanized (HDG) |
Thread Type | Unified National (UNC/UNF), Metric (M) |
Coating Thickness | ≥85μm for sizes ≥3/8", ≥50μm for sizes <3/8" |
Our Heavy Hex Nut 2HM HDG is the preferred fastening solution for industrial purchasers and engineering contractors across heavy-duty sectors, including oil and gas production wellhead assemblies, power generation boiler systems, structural steel bridge construction, heavy mining machinery manufacturing, and petrochemical processing reactor equipment.
We cater exclusively to bulk procurement clients and industrial manufacturing purchasers, offering flexible supply solutions tailored to your project and production needs. Our standard bulk order MOQ starts at 500 pieces, with tiered volume discounts for large-scale orders to optimize your procurement costs. Beyond standard sizes, we provide full custom manufacturing services, including non-standard dimensions, custom thread profiles, alternative material options, and specialized surface finishes, with full batch traceability for every production run.
ASTM A194 Grade 2HM is a globally recognized industrial standard for carbon steel heavy hex nuts, specifically designed for high-pressure and high-temperature piping and pressure vessel applications, paired with high-strength alloy steel bolts.
HDG finish provides superior, long-lasting corrosion protection for steel fasteners, making them suitable for outdoor, coastal, and chemically exposed environments where standard zinc plating degrades rapidly.
Yes, every batch of our Heavy Hex Nut 2HM HDG comes with full material test reports (MTRs) and batch traceability, ensuring full compliance with industrial project and regulatory requirements.
Whether you need bulk standard supply for ongoing production, custom-manufactured nuts for a specialized project, or technical support for your fastening application, our team is here to help. Contact us today with your specific size requirements, order volume, and custom specifications, and we will provide you with a free, no-obligation custom quote within 24 hours. We also offer free sample testing for qualified bulk procurement clients.
