Steel 4140
Steel alloy 4140 cold roll is a popular general-purpose alloy, ideal for parts that require high tensile strength and toughness. It has considerable atmospheric corrosion and wear resistance, and will not become brittle.
4140 has a machining cost factor of 2.9 when compared to steel 12L14. It is not ideal for welding due to its lead content. It is often used for forging, responds very well to heat treatment, and can be annealed.
Industries & Applications
- Gears
- Shafts
- Bolts and nuts
- Pins
- Pump and valve components
Steel Parts Gallery
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Steel 4140 Characteristics
| TEMPER | Yield Strength (ksi) | Ultimate Tensile Strength (ksi) | Modulus of Elasticity (ksi) | Brinell Hardness (500km/10mm) |
|
Annealed |
96 |
130 |
30,000 |
200 |
|
Quenched and Tempered |
140 |
160 |
30,000 |
310 |
|
Normalized |
96 |
150 |
30,000 |
300 |
Steel Cost Comparison
| Type | General Characteristics | Alloy | Common Applications | Tolerances for a 1/2" Dia. Bar | Material Cost Factor | Machining Cost Factor |
|---|---|---|---|---|---|---|
| Steel |
Popular general-purpose alloy. Direct hardening
|
4140 or 4142 |
Gears, shafts, pins, bolts and nuts, pump and valve components
|
Cold drawn 0 |
1.1 | 2.9 |
Common Material Cost Comparison
| Type | General Characteristics | Alloy | Common Applications | Tolerances for a 1/2" Dia. Bar | Material Cost Factor | Machining Cost Factor |
|---|---|---|---|---|---|---|
| Steel |
Designed for excellent machinability. Case hard only
|
12L14 |
Endless commercial products; probably more pounds used in turned products than any other bar stock
|
Cold drawn 0 |
1 | 1 |
| Stainless Steel |
Designed for machining, non-magnetic
|
303 |
Electronic hardware, automotive, aerospace, medical instruments, and many applications requiring corrosion resistance
|
Cold finished +/- .002 |
1.9 | 2.7 |
| Brass |
Strength, corrosion and wear resistance, and excellent machinability
|
C35300 |
Well suited for parts with knurling or threading
|
+0015 | 3.5 | .07 |
| Aluminum |
Designed for machining
|
2011 |
Electronic hardware, endless commercial products
|
Cold finish +/-.0015 |
3.8 | .6 |
| Titanium |
High strength, light weight, good bio-compatibility
|
Ti-6Al-4VEli |
Medical implants
|
Ground & polished +/-.002 |
30.2 | 6 |
To review our Machining Materials Guide, please click here.
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