4041 Alloy Steel: Parts and Prototyping: Custom CNC Machining
San Jose - San Francisco - Oakland - Bay Area
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Alloy Steel 4041 (UNS G41400): CNC machining

AC Manufacturing is a complete cnc machine shop capable of machining parts to customer specification (conventional and 5 axis machining). We can machine to print and accept the most common file formats including: .dwg .dxf .iges .step .sat as well as .pdf files. If you don't see your file format here let us know. Please send us files to: sales@acmanufacturing.com We can accept both small and large run jobs of custom machined parts.

We provide Turning and Milling, 3 axis , 3+2 axis & continuous 5 axis machining).

We accept both small and large run jobs, Minimum quantity for order is 1.
Short lead times are often available 2-3 days.
Standard lead time is 2 weeks.
4140 chemical analysis
C Carbon 0.38 – 0.43
Mn Manganese 0.75 – 1.00 max
P Phosphorus 0.035 max
S Sulfur 0.040 max
Si Silicon 0.20 – 0.35
Cr Chromium 0.80 – 1.10
Mo Molybdenum 0.15 – 0.25

4041 parts cnc machining AISI or SAE 4140 steel alloy is a low-alloy steel containing chromium and molybdenum as strengthening agents. Its chemical composition is seen bellow. AISI/SAE 4140 grade is a versatile alloy with good atmospheric corrosion resistance and reasonable strength up to around 600º F (315º C.) It shows good overall combinations of strength, toughness, wear resistance and fatigue strength. It has high fatigue strength, abrasion and impact resistance, toughness, and torsional strength.

AISI 4140 alloy steel has high ductility. It can be formed using conventional techniques in the annealed condition. It requires more pressure or force for forming because it is tougher than plain carbon steels. The alloy is readily machinable.

AC Manufacturing has the experience, knowledge, and CNC equipment required to machine a wide array of materials, including Alloy Steel 1400. Our custom design and manufacturing services means you receive a unique solution to your complex component problems. This medium carbon alloy grade is widely used for many general purpose parts requiring high tensile strength and toughness.

Simple shapes might be machined following a normalizing treatment, whereas more complex shapes will require annealing. At the carbon level of this grade, a structure of coarse lamellar pearlite to coarse spheroidite is normally optimum for machinability. Pre hardened and tempered 4140 can be further surface hardened by flame or induction hardening and by nitriding.

4140 alloy steel is used extensively in most industry sectors for a wide range of applications such as: Adapters, Arbors, Axle Shafts, Bolts, Crankshafts, Connection Rods, Chuck Bodies, Collets, Conveyor Pins & Rolls, Ejector Pins, Forks, Gears, Guide Rods, Hydraulic Shafts & Parts,Lathe Spindles, Logging Parts, Milling Spindles, Motor Shafts, Nuts, Pinch Bars, Pins Various, Pinions, Pump Shafts, Rams, Sockets, Spindles, Sprockets, Studs, Tool Holders, Torsion Bars, Worm cnc machine shop

4140 may be heat treated over a wide range to give the combined advantages of proper hardness, strength and ductility. In conditions where localized hardness may be required, this steel is readily flame or induction hardened. Because its components alloy 4041 is often informally referred to as chromoly steel (common variant stylings include chrome-moly, cro-moly, CrMo, CRMO, CR-MOLY, and similar). They have an excellent strength to weight ratio and are considerably stronger and harder than standard 1020 steel, but are not easily welded (need pre and post weld thermal treatment to avoid cold cracking). While these grades of steel do contain chromium, it is not in great enough quantities to provide the corrosion resistance found in stainless steel.

Machining Alloy Steel 4140
AC Manufacturing specializes in manufacturing cnc precision machined parts using 5 axis machines. With over two generations of knowledge and experience, our team is able to produce parts that require innovative tooling and fixturing in a timely manner with competitive price. With a full range of modern equipment, we deliver one-stop shopping for precision machined components, from small quantities to large volume. Our capabilities include 3-, 4- and 5-axis CNC milling and multi-tasking turning.

AISI 4140 has good machinability. Operations such as turning, hobbing, drilling, sawing, broaching, tapping and milling can be easily performed using the recommendations provided by the machine's manufacturer for ideal tool type-feeds and speeds. 4140 in the hardened and tempered as supplied condition has good to very good machinability and operations such as sawing, turning, drilling, broaching, hobbing, milling and tapping can be carried out satisfactoraly using machine manufacturers recommendations for suitable tool type - feeds and speeds.

matsuura AISI 4140 has the following properties: Machinability rating at 66% of B1112 Average cutting speed of 110 ft/min.

We use 5 axis machines such as Haas UMC 750 and Haas VF-5SS as well as conventional milling equipment Matsuura RA-1G, MC 500V PC 2S and MC-510 VG)


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