AMS 6348 AISI 4130 Cold Finished Round Bar

Premium AMS 6348 aircraft quality 4130 cold finished round bar with stable strength & weldability. ZYTC Alloy supplies certified AISI 4130 steel for aerospace, automotive & industrial applications.

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AMS 6348 AISI 4130 Cold Finished Round Bar is aircraft‑quality chrome‑molybdenum low‑alloy steel, supplied by ZYTC Alloy, a trusted Chinese aerospace alloy supplier. Well‑balanced weldability and moderate tensile strength make it widely specified for aircraft structural parts, ground‑support equipment and high‑performance automotive components. As Aircraft‑Quality (AQ) grade, post‑machining magnetic particle inspection per AMS 2301 is required for flight‑critical service.

Chemical Composition (Weight %)

Element	C	Mn	Si	P	S	Cr	Ni	Mo	Cu
Min	0.28	0.40	0.15	—	—	0.80	—	0.15	—
Max	0.33	0.60	0.35	0.025	0.025	1.10	0.25	0.25	0.35

Mechanical Properties (Normalised Cold‑Finished Round Bar)

Property	Typical Value
Tensile Strength	97,000 psi (approx. 669 MPa)
Yield Strength	63,000 psi (approx. 434 MPa)
Elongation (2‑inch gauge length)	26%
Brinell Hardness	197 HB (500 kg load)
Rockwell Hardness	92 HRB
Shear Strength	62 ksi
Density	7.85 g/cm³

Note: The above are typical values for the normalised condition; actual values may vary with section size and specific heat treatment.

Related Specifications

AMS 6348 is one of several aerospace specifications for 4130 alloy, which also include:

AMS 6345: Sheet/Plate, Normalised
AMS 6346: Bar, Hardened & Tempered (125 ksi tensile strength)
AMS 6350: Sheet/Plate
AMS 6351: Sheet/Plate, Spheroidised
AMS 6370: Bar, Forgings, and Rings
AMS 6371: Tubing
MIL‑S‑6758, MIL‑S‑18729, MIL‑T‑67366 (Military specifications)
ASTM A108, ASTM A322, ASTM A331
UNS G41300

Product Forms Available at ZYTC Alloy

We provide AISI 4130 in multiple mill forms: cold‑finished round bars, squares, hexagons, flats, sheets, plates, tubes and welding wire. Custom diameters, lengths and auxiliary heat‑treatment services are supported for aerospace and industrial projects.

Applications

Military & commercial aircraft structural parts
Aerospace ground‑support systems
Racing & off‑road automotive components
Hydraulic tool assemblies
Machine‑tool parts and engineered shear‑pin fasteners

Why ZYTC Alloy

Our AMS 6348 4130 cold finished round bars are produced with full material traceability, complete MTR documentation and support third‑party inspection, complying with global aerospace procurement standards.

Whether you need standard stock sizes or custom processed AMS 6348 4130 cold finished round bars for aerospace, automotive and mechanical projects, ZYTC Alloy delivers fully certified, high-precision aircraft-grade steel. Contact us at daisy@zytcsteel.com to get verified material data sheets, professional technical support and a tailored quote for your project.