4140 steel, commonly known as Chromoly steel, combines high strength with good toughness and wear resistance. This guide highlights five reliable 4140 round bars available online, covering sizes from under 1 inch to 1.5 inches in diameter and standard 12-inch or longer lengths. Each entry references key features, including annealed or cold-finished options, to help buyers compare suitability for high-stress applications, machine work, or fabrication projects.
Summary of chosen products:
| Product | Diameter | Length | Brand | |
|---|---|---|---|---|
| 4140 Alloy Steel Round Bar, 0.6875″ | 0.6875″ | 12″ | Annealed | Online Metals |
| 0.937″ x 36″ 4140 Round Rod | 0.937″ | 36″ | Cold Finished | Online Metal Supply |
| 0.75″ x 12″ 4140 Round Bar | 0.75″ | 12″ | Annealed | OnlineMetals |
| 1.5″ x 12″ 4140 Round Bar | 1.5″ | 12″ | Annealed | OnlineMetals |
| 1-1/8″ Diameter 4140 CD HT Bar | 1.125″ | 12″ | Cold Drawn | Generic |
4140 Alloy Steel Round Bar, 0.6875″ Diameter, 12″ Length
Product highlights include 4140 steel, commonly referred to as Chromoly steel, noted for its high strength, resistance to fracturing, abrasion, and impact in demanding applications. The bar is 0.6875 inches in diameter and 12 inches long, with an annealed finish suitable for machining and forming processes.
0.937″ x 36″ 4140 Round Rod, Cold Finished
This 4140 steel round rod measures 0.937 inches in diameter and 36 inches in length, provided in a cold-finished condition. The 4140 composition offers robust strength and wear resistance for high-stress components and machined parts.
1.5″ Diameter Round Bar, 12″ Length, 4140
This option features a 1.5-inch diameter round bar, 12 inches long, crafted from 4140 steel with an annealed finish. Known for strength and resilience under stress, it suits heavy-duty machining and fabrication tasks where dimensional stability matters.
1-1/8″ Diameter Round Bar, 4140 CD HT
The 1-1/8 inch diameter, 12-inch length 4140 round bar is cold-drawn heat-treated (CD HT), offering improved hardness and wear resistance. This makes it suitable for precision applications and machined components requiring tighter tolerances.
0.937″ x 72″ 4140 Round Rod
This 0.937-inch diameter round rod extends to 72 inches in length, offering a longer stock option for projects requiring extended machining or fabricating runs. 4140 composition enhances strength and impact resistance under load.
Buying Guide: Key Considerations For 4140 Round Bars
- Diameter and length: Match the bar size to your component’s required tolerances, ensuring enough material for finishing operations.
- Finish and heat treatment: Annealed surfaces provide easier machining, while cold-drawn and heat-treated options offer higher hardness and strength for finished parts.
- Machinability: Chromoly (4140) balances machinability with strength, but tooling selection and coolant use can impact surface finish and tolerances.
- Hardness and strength: Consider whether you need a bar for high-stress or high-impact applications; CD HT variants deliver greater hardness compared to annealed forms.
- Budget and availability: Compare stock lengths and brands to minimize waste and downtime, especially for longer runs or custom lengths.
- Source quality: Choose reputable suppliers with certified material composition and consistent product specifications to ensure reliable performance.
- Applications: Use 4140 for structural components, shafts, pins, bushings, or any part requiring balanced strength, toughness, and wear resistance.
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