Brian Fasteners supplies high-strength AISI 4340 alloy steel bars and rods to Houston, USA clients. Our advanced manufacturing and quality control procedures guarantee bars with first–class mechanical performance, precision tolerance, and traceability. AISI 4340 is known for its high strength and toughness, fatigue strength, and resistance. We guarantee each rod conforms to customer specifications for aerospace, defense, and high-performance mechanical equipment. Brian Fasteners provides metallurgical expertise, adaptable order fulfillment, and high-quality alloy solutions customized to demanding engineering applications.
AISI 4340 has 0.38–0.43% carbon, 0.70–0.90% manganese, 0.40–0.60% chromium, 1.65–2.00% nickel, and 0.20–0.30% molybdenum. Its broad alloy content enables excellent heat-treatment response and strength. Heat-treated 4340 bars have tensile strength of 930–1,400 MPa, yield strength of around 850–1,200 MPa, and toughness that can withstand shock loading. Excellent impact resistance and fatigue strength make it suitable for critical applications. Machining is viable when pre-machined in lower hardness, and weldability is average—suitable for heavy-duty engineering requirements.
| Sizes | 2-100mm A/F |
|---|---|
| Tolerance | H9, H8, H10, K12, H13K9, K10, H11, H12, K11 |
| Round bar Sizes | Diameter: 3-~800mm |
| Technique | Hot Rolled, Cold Drawn, Cold Rolled, Forged, Rod |
| Processing | Bar cutting to 650mm |
| Surface | Bright, Hot Rolled Pickled, Sand Blasting Finished, Hairline, Cold Drawn, Polished suppliers |
| Condition | Hardened and tempered, annealed |
| Form | Precision Square, Ingot, T-Bar, Rod, Round, Welding Rod, I/H Bar, Flat Bar, Blocks, Rings, Rectangle, Hex (A/F), Hollow, Threaded, Profiles, Ground Bar, Channel Bar, Billet, Triangle, Round Rod, Half Round Bar, Forging etc. |
| Square bar Sizes | 4 to 100mm |
| Finish | Hot rolled annealed, Bright, smooth turned, Polish, Rough Turned, Cold (bright) drawn, centreless ground, Grinding, peeled, hot rolled, slit rolled edge, Centreless Ground & Black. |
| Flat bar Sizes | Width: 10 – 500 millimeter Thick.: 2 to 100 millimeter |
| Element | Composition |
|---|---|
| C% | 0.38/0.43 |
| Mn% | 0.60/0.80 |
| P% | 0.035 max |
| S% | 0.040 max |
| Si% | 0.20/0.35 |
| Ni% | 1.65/2.00 |
| Cr% | 0.70/0.90 |
| Mo% | 0.20/0.30 |
| Property | Value |
|---|---|
| Tensile Strength | 850-1000 N/mm 2 |
| Elongation | 13% |
| Hardness | 250-350 HB |
Alloy Steel AISI 4340 is commonly used in aerospace, automotive, and heavy machinery applications due to its excellent strength, toughness, and fatigue resistance. It's ideal for manufacturing shafts, gears, and structural components.
AISI 4340 offers high tensile strength, excellent toughness, and good wear resistance. It is known for its ability to withstand high-stress and high-impact conditions.
Yes, AISI 4340 can be heat-treated to enhance its hardness and strength, making it highly adaptable for different engineering requirements.
AISI 4340 rods and bars find widespread use in landing gear parts, aircraft structural components, crankshafts, heavy-duty gears, and high-performance drive shafts. Their combination of properties also serves the valve parts, high-stress fasteners, and structural assemblies in defense and motorsport sectors. The fatigue strength and impact behavior of the alloy place it in applications for rotating shafts, railway axles, and structural fasteners. With weldability and toughness, 4340 steel bars are dependable in safety-critical applications with less deformation and high dependability under dynamic loads.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
George Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Houston, USA
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