AISI 4340 Special Alloy Steel Bolts And Nuts
AISI 4340 Special Alloy Steel Bolts and Nuts for Heavy-Duty, Petroleum, and Marine Applications
SSM supplies high-strength AISI 4340 alloy steel bolts and nuts designed for critical applications in heavy-duty machinery, oil and gas equipment, and marine environments. These fasteners are engineered for superior mechanical performance, durability, and resistance to wear and fatigue under extreme working conditions.
Product Overview
AISI 4340 is a nickel-chromium-molybdenum (Ni-Cr-Mo) alloy steel known for its exceptional toughness, high tensile strength, and fatigue resistance. When properly heat-treated, it provides outstanding performance in demanding industrial and offshore environments.
SSM manufactures bolts, nuts, and threaded fasteners from 4340 material with precise machining, ensuring dimensional accuracy and consistent quality.
Key Features
High tensile and yield strength for heavy mechanical loads
Excellent fatigue and impact resistance even at low temperatures
Superior toughness and hardenability through heat treatment
Good resistance to wear, shock, and stress corrosion
Available in quenched and tempered or surface-coated conditions (e.g., Xylan, PTFE, Zinc, or Hot Dip Galvanized)
Technical Specifications
| Parameter | Description |
|---|---|
| Standard | ASTM A322 / AISI 4340 |
| Type | Bolts, Nuts, Stud Bolts, Hex Bolts |
| Material | AISI 4340 Alloy Steel |
| Grades | Quenched & Tempered |
| Thread Type | UNC / UNF / Metric |
| Size Range | M6 to M100 or customized |
| Finish | Plain, Black Oxide, Zinc-Plated, Xylan/PTFE Coated |
| Hardness | 35–44 HRC (Typical after heat treatment) |
| Testing | Tensile, Hardness, Impact, and Non-Destructive Testing (NDT) |
| Certification | EN 10204 3.1 or 3.2 available |
Applications
Heavy-Duty Machinery and Construction Equipment
Petroleum and Natural Gas Processing Plants
Offshore and Marine Engineering
Power Generation and Energy Sectors
Aerospace and Defense Systems
Why Choose SSM
Over 30 years of professional experience in alloy fastener manufacturing
Strict material traceability and quality control
Compliance with ASTM, ASME, DIN, and ISO standards
Custom production available for size, coating, and mechanical properties
Fast delivery and global export support
Conclusion
The AISI 4340 Alloy Steel Bolts and Nuts from SSM deliver exceptional performance under the toughest conditions, making them ideal for petroleum, natural gas, marine, and heavy-duty mechanical applications.
Combining precision forging, advanced heat treatment, and strict inspection, SSM ensures every fastener meets the highest global standards of strength and reliability.
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