Heavy Hex Galvanized Stud Bolts and Nuts
Our Heavy Hex Galvanized Stud Bolts and Nuts represent industrial-grade fastening solutions engineered for critical applications in oil & gas, petrochemical, power generation, and structural industries. Manufactured from high-strength carbon and alloy steel with precise thread geometry and protective galvanized coatings, these fasteners deliver exceptional clamping force, corrosion resistance, and long-term reliability in demanding environments.
The stud bolt configuration provides superior load distribution compared to conventional bolts, making them ideal for flange connections in high-pressure piping systems, pressure vessels, and heat exchangers. The heavy hex nut design offers increased wrenching surface for higher torque application and reduced rounding risk. Available with various galvanizing processes and specialty coatings, our fasteners are engineered to withstand corrosive atmospheres, temperature extremes, and cyclical loading conditions while maintaining their mechanical integrity and performance characteristics.
Different type bolt
The difference between bolts and screws lies in two aspects: one is the shape, the stud part of the bolt is strictly required to be cylindrical, used to install the nut, but the stud part of the screw is sometimes conical or even with a tip; the other is Using the function, the screw is screwed into the target material instead of the nut. In many occasions, the bolts also work individually, and are directly screwed into the pre-drilled threaded hole, without the need for a nut to cooperate with it. At this time, the bolt is classified as a screw in terms of function.
The shape and purpose of the bolt head are divided into hexagonal head bolts, square head bolts, half-round head bolts, countersunk head bolts, bolts with holes, T-head bolts, hook head (foundation) bolts and so on.
The thread of the column can be divided into coarse thread, fine thread and inch thread, so it is called fine bolt and inch bolt.
Material Specifications:
Stud Bolt Materials: ASTM A193 B7 (Chrome-Molybdenum Alloy), ASTM A320 L7 (Low Temperature), ASTM A307 (Carbon Steel)
Nut Materials: ASTM A194 2H (Heavy Hex), Grade 8, Grade 10
Chemical Composition: Controlled chemistry for specific mechanical properties
Heat Treatment: Quenched and tempered for optimal strength-toughness balance
Manufacturing Precision:
Thread Rolling: Cold forming process for superior thread strength and fatigue resistance
Heat Treatment: Controlled quenching and tempering cycles
Surface Preparation: Shot blasting for proper coating adhesion
Galvanizing Process: Hot-dip or mechanical galvanizing per ASTM A153/A153M
Thread Specifications:
Thread Type: UNC (Coarse), UNF (Fine), 8UN, Metric
Thread Class: 2A/2B for standard applications, 3A/3B for precision fits
Thread Length: Fully threaded or double-end studs with plain center section
Chamfer: Precision machined lead-in chamfers for easy assembly
Heavy Hex Nut Features:
Dimensions: ASME B18.2.2 compliance
Wrenching Surface: Increased flat-to-flat distance for higher torque capability
Thread Engagement: Full or partial thread options
Markings: Grade identification and manufacturer's mark
Galvanizing Process Options:
Hot-Dip Galvanizing: Zinc coating thickness 2-6 mils (50-150 microns)
Mechanical Galvanizing: Uniform zinc coating without hydrogen embrittlement risk
Post-Treatment: Passivation, quenching, or chromating for enhanced corrosion protection
Production Process
First, the first punch moves to prepare the wire for forming, and then the second punch moves to forge the wire again and shape the finished product. In the cold heading process, the fixed die (compression die) and the stamping (flattening) die (punching)
The number of heads) is not the same. Some complex screws may require multiple punches to form together, which requires multi-station equipment to make the screw forming.After the movement of the punch, the head of the screw has been completed, but the part of the screw shaft has not been threaded.The method of forming the screw thread is thread rolling. Thread rolling is the use of two relatively rotating thread rolling dies(rubbing plates) with threaded teeth to squeeze a cylindrical blank formed by amulti-station or heading machine in the middle.
After heading and rubbing the teeth, the entire screw has been produced. Of course, in order to make the appearance of the screw brighter and better, the surface treatment process is usually done. Such as cleaning and passivation of stainless steel screws,electroplating on the surface of carbon steel screws, etc. Made into various colors of screw fasteners.
Protective Packaging:
VCI Protection: Volatile Corrosion Inhibitor paper or bags
Individual Wrapping: For precision threads and coatings
Bundle Packaging: By size and grade with steel banding
Desiccant Inclusion: Humidity control for long-term storage
Identification & Marking:
Color Coding: Grade identification through painted ends or bands
Bag Tagging: Complete specifications on waterproof tags
Barcode System: For automated inventory management
Lot Numbering: For complete traceability
Shipping Configuration:
Wooden Crates: For large diameter and long length fasteners
Steel Drums: For bulk quantities with maximum protection
Pallets: Standardized pallet sizes for easy handling
Container Loading: Optimized for maximum weight and volume utilization
Documentation:
Packing Lists: Detailed by size, grade, and quantity
Material Certificates: Original or certified copies
Certificate of Origin: For international shipments
MSDS: Material Safety Data Sheets for coated products
Logistics Management:
Inventory Management: Real-time stock visibility
Just-in-Time Delivery: Synchronized with project schedules
Export Documentation: Complete customs clearance support
Tracking Systems: Online tracking for all shipments
Q: Can you accept TPI?
A: Yes, sure. Welcome visit our factory and come here to inspect the goods and inspect production process.
Q: Can you supply Form e, Certificate of origin?
A: Yes, we can supply.
Q: Can you supply invoice and CO with chamber of commerce?
A: Yes, we can supply.
Q: Can you accept L/C deferred 30, 60, 90 days?
A: We can. Please negotiate with sales.
Q: Can you accept O/A payment?
A: We can. Please negotiate with sales.
Q: Can you supply samples?
A: Yes, some samples are free, please check with sales.
Q: Can you supply the products which comply with NACE?
A: Yes, we can.
