4140/4150 HR Heat Treated Bar Stock
We stock AISI 4140 and AISI 4150 steel in rounds, squares, and flats. All material is provided in a hot roll finish. Call or Email Us For a Free Quote. Material is quench & tempered, stress relieved and machine straightened. We offer an extensive inventory of hard-to-find sizes and lengths including (10/12 Ft Random Lengths, 20/24 Ft Random Lengths and Custom Cut-To-Length options). Alloy 4140 and 4150 are widely used for general purpose machine applications. Typically, 4150 and 4140 round bar stock over 10″ diameter is furnished as Rough Turned Oversized.
Rounds (Inches)
| 1/2 | 1-7/8 | 3-1/2 | 6-1/4 | 9 | 14 |
| 5/8 | 2 | 3-3/4 | 6-1/2 | 9-1/2 | 16 |
| 3/4 | 2-1/8 | 4 | 6-3/4 | 9-3/4 | |
| 7/8 | 2-1/4 | 4-1/4 | 7 | 10 | |
| 1 | 2-3/8 | 4-1/2 | 7-1/4 | 10-1/2 | |
| 1-1/8 | 2-1/2 | 4-3/4 | 7-1/2 | 11 | |
| 1-1/4 | 2-5/8 | 5 | 7-3/4 | 11-1/4 | |
| 1-3/8 | 2-3/4 | 5-1/4 | 8 | 11-1/2 | |
| 1-1/2 | 2-7/8 | 5-1/2 | 8-1/4 | 12 | |
| 1-5/8 | 3 | 5-3/4 | 8-1/2 | 13 | |
| 1-3/4 | 3-1/4 | 6 | 8-3/4 | 13-1/2 |
Squares (Inches)
| 1/2 | 1 | 1-3/4 | 3-1/2 | 6 |
| 5/8 | 1-1/8 | 2 | 4 | |
| 3/4 | 1-1/4 | 2-1/2 | 4-1/2 | |
| 7/8 | 1-1/2 | 3 | 5 |
Flats (inches)
| 1/4 x 1 | 3/8 x 4 | 5/8 x 3 | 1 x 2-1/2 | 1-1/2 x 2-1/2 | 2-1/2 x 3-1/2 |
| 1/4 x 1-1/2 | 1/2 x 1 | 3/4 x 1-1/2 | 1 x 3 | 1-1/2 x 3 | 2-1/2 x 4 |
| 1/4 x 2 | 1/2 x 1-1/2 | 3/4 x 2 | 1 x 4 | 1-1/2 x 4 | 2-1/2 x 6 |
| 1/4 x 3 | 1/2 x 2 | 3/4 x 2-1/2 | 1 x 5 | 1-1/2 x 5 | 3 x 4 |
| 1/4 x 4 | 1/2 x 2-1/2 | 3/4 x 3 | 1 x 6 | 1-1/2 x 6 | 3 x 5 |
| 1/4 x 5 | 1/2 x 3 | 3/4 x 4 | 1-1/4 x 2 | 2 x 2-1/2 | 3 x 6 |
| 1/4 x 6 | 1/2 x 3-1/2 | 3/4 x 5 | 1-1/4 x 2-1/2 | 2 x 3 | |
| 3/8 x 1-1/2 | 1/2 x 4 | 3/4 x 6 | 1-1/4 x 3 | 2 x 3-1/2 | |
| 3/8 x 2 | 1/2 x 5 | 1 x 1-1/4 | 1-1/4 x 3-1/2 | 2 x 4 | |
| 3/8 x 2-1/2 | 1/2 x 6 | 1 x 1-1/2 | 1-1/4 x 4 | 2 x 5 | |
| 3/8 x 3 | 5/8 x 2 | 1 x 2 | 1-1/2 x 2 | 2 x 6 |
4140/4150 HR Heat Treated Bar Stock FAQs
The main difference between 4140 and 4150 steel is their carbon content. 4150 steel contains a higher percentage of carbon compared to 4140 steel. This increase in carbon makes 4150 steel harder, while also providing strength and heat resistance. 4140 offers a slightly better combination of strength and ductility, making it more flexible for general high-stress machinery parts.
4140 is your best option when flexibility or shock resistance is needed for a project like for gears, crankshafts, or under cyclic loadings. 4150 is ideal for projects where maximum strength and heat resistance is needed such as in high-stress shafts, structural parts, and barrels in firearms.
Most steel distributors offer 4140/4150 HR bar stock in either round, square, or flat shapes. A typical 4140/4150 length can range anywhere from 10 to 13 ft or 20 to 26 ft.
4140/4150 is significantly stronger. 1045 lacks the strengthening Chromium and Molybdenum, resulting in lower yield and tensile strengths. 4140 is necessary for critical components requiring superior wear and fatigue resistance, while 1045 is suited for non-critical, general machinery parts.
4340 is an enhanced alloy containing Nickel not found in 4140. This Nickel content gives 4340 deep hardenability for very large components (e.g., over four inches in section) where maximum strength is mandatory. However, 4140/4150 is generally more cost-effective and easier to machine than 4340.
The best way to keep 4140/4150 from rusting is with proper handling and storage. These items should be stored in dry locations and typically on racks, away from the ground. Additionally, protective coatings can also be utilized like oil or powder coatings to keep rust away.
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