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AISI/SAE 4140 Alloy Steel Bar

AISI 4140 steel bar is made of a low alloy steel containing chromium, molybdenum and manganese. It has a high carbon content and a good balance of strength, toughness, wear resistance, impact resistance and heat treatment capabilities.

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AISI/SAE 4140 Alloy Steel Bar Description

4140 steel is a 1% chromium-molybdenum general-purpose high-strength steel, usually hardened and tempered in the tensile range of 850-1000 Mpa. 4140 steel has improved machinability, which greatly increases feed and speed, while extending tool life without affecting mechanical properties. The prehardening and tempering 4140 can be further case hardened by flame or induction hardening and nitriding. AISI4140 steel bars have high strength, hardenability, good toughness, small deformation during quenching, and high creep strength and durable strength at high temperatures.

Product Parameters

Product Name	AISI/SAE 4140 Alloy Steel Bar
Standard	EN/DIN/JIS/ASTM/BS/ASME/AISI, etc.
Common Round Bar Specifications	3.0-50.8 mm, Over 50.8-300mm
Flat Steel Common Specifications	6.35x12.7mm, 6.35x25.4mm, 12.7x25.4mm
Hexagon Bar Common Specifications	AF5.8mm-17mm
Square Bar Common Specifications	AF2mm-14mm, AF6.35mm, 9.5mm, 12.7mm, 15.98mm, 19.0mm, 25.4mm
Length	1-6meters, Size Accept Custom
Diameter(mm)	Hot Rolling Round Bar	25-600	Cold Rolling Square Bar	6-50.8
	Hot Rolling Square Bar	21-54	Cold Rolling Hexagon Bar	9.5-65
	Cold Rolling Round bar	6-101.6	Forged Rebar	200-1000
Surface Process	Bright, Polished, Black
Other Services	Machining(cnc), Centerless Grinding(cg), Heat Treatment, Annealing, Pickling, Polishing, Rolling, Forging, Cutting, Bending, Small Machining, etc.

Chemical Composition

Grade	Mn	S	C	P	Si	Cr	Ni
AISI 4140	0.75-1.00	0.035	0.38-0.43	0.035	0.20-0.35	0.8-1.1	0.15-0.25

Mechanical Properties

Grade	Tensile Strength psi	Yield Strength psi	Elongation %	Hardness HRC
AISI 4140	100k	80k	20	18-22

Scope of Application

SAE 4140 are widely used in most industrial sectors, with a wide range of applications, such as: adapters, spindles, axles, bolts, crankshafts, connecting rods, chuck bodies, chucks, conveyor belt pins and rollers, ejection pins, forks, gears, Guide rods, hydraulic shafts and parts, lathe spindles, logging parts, milling spindles, motor shafts, nuts, clamping rods, various pins, pins, pump shafts, plungers, sleeve, spindle, sprocket, stud bolt, tool holder, torsion bar, worm, etc.

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FAQ

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Q：

How do you guarantee product quality?

A：

Our factory operates under strict QA/QC standards. Every product is inspected during production and before shipment to ensure it meets agreed quality specifications. We can provide mill test certificates and accept thirdparty inspections upon request.

Q：

What certifications do you have?

A：

Our products comply with international standards including ASTM, ASME, DIN, and EN. We also hold quality management certifications and can provide relevant documentation upon request.

Q：

Can I get samples before ordering?

A：

Yes. We can provide free samples for your evaluation. Shipping costs are typically borne by the customer. Please contact our sales team to arrange sample delivery.

Q：

What is your minimum order quantity (MOQ)?

A：

MOQ varies by product type and specification. For certain items, trial orders may be considered. Please contact us with your specific requirements for a confirmed MOQ.

Q：

What payment terms do you accept?

A：

We commonly accept T/T (30% deposit in advance, 70% balance before shipment) and L/C. Other payment terms may be negotiated depending on order value and cooperation conditions.

Q：

Do you offer discounts for large orders?

A：

Yes. We have strong capabilities for largescale project supply and offer favorable pricing for bulk orders. Our 100,000ton stock capacity allows us to provide competitive rates for volume purchases.

Q：

What is your typical lead time?

A：

For stocked products, we can deliver to the loading port within 3–7 days after receiving the deposit. For production orders, lead time is typically 15–30 days after order confirmation, depending on product type and quantity.

Q：

What shipping terms do you support?

A：

We support EXW, FOB, CIF, CFR, DDU, and other common trade terms. Shipping can be arranged by sea, air, or courier based on your requirements.

Q：

How do you package the products?

A：

We use standard export packaging suitable for sea freight. For fragile or highsurfacefinish products such as stainless steel, we apply strict protective packaging to prevent scratches and damage during transit. Custom packaging is also available upon request.

Q：

How can I become your agent?

A：

We are actively recruiting regional agents worldwide. If you are interested, please contact us with your background, market coverage, and target regions. We offer competitive agent policies and full support for your local market development.

Q：

Do you accept bulk procurement orders?

A：

Yes. Bulk procurement is one of our core business models. With over 100,000 tons of stock and a robust supply chain, we are wellequipped to handle largevolume orders for overseas projects, manufacturers, and trading companies.

Q：

Do you provide aftersales service?

A：

Yes. Our professional service team is available to address any questions regarding product quality, delivery, or usage. We are committed to providing ongoing support throughout our partnership.

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