New Lower Shipping Rates! Get the industry's best ground prices and save more—especially on longer lengths.  

Shop all Products
Explore OLM Rewards

Open for Orders 24/7!

Deals
Get a Quick Quote!

Alloy Steel Rectangle Bar 4140 Heat Treat

-69 Products

4140 is a chromium-molybdenum alloy steel renowned for its high strength, toughness, and wear resistance after heat treatment. The rectangular bar shape of this low-alloy steel makes it ideal for machining components with flat surfaces and perpendicular edges, such as gears, shafts, and fixtures across industries like aerospace, automotive, and oil & gas. Its superior mechanical properties, including high tensile strength, fatigue strength, and impact resistance, make it a popular choice for critical applications requiring durability and reliability.
alt text here

Sort by

Relevance
  • Relevance
  • Size
  • Price:Low to High
  • Product Name: A to Z
  • Product Name: Z to A
  • Price:High to Low

Close

Filters

Temper

DFARS

seller

Material

Shape

Online Metals #1 in Freight Shipping!

1" X 12" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002639

1" X 12" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002639

Click for more details

Dimensions

  • Thickness: 1"
  • Width: 12"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $295.59 ea.
  • 24″ (2 ft.) - $591.18 ea.
  • 36″ (3 ft.) - $886.76 ea.
  • 48″ (4 ft.) - $1,182.35 ea.
  • 60″ (5 ft.) - $1,477.94 ea.
  • 72″ (6 ft.) - $1,773.53 ea.
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.
Create Custom Cut

QTY

$295.59 ea.
$295.59 for 1
Sold and shipped by MSP Metals

0.5" X 1.5" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002640

0.5" X 1.5" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002640

Click for more details

Dimensions

  • Thickness: 0.5"
  • Width: 1.5"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $22.40 ea.
  • 24″ (2 ft.) - $44.78 ea.
  • 36″ (3 ft.) - $67.17 ea.
  • 48″ (4 ft.) - $89.56 ea.
  • 60″ (5 ft.) - $111.95 ea.
  • 72″ (6 ft.) - $134.34 ea.
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.
Create Custom Cut

QTY

$22.40 ea.
$22.40 for 1
Sold and shipped by MSP Metals

2" X 8" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002641

2" X 8" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002641

Click for more details

Dimensions

  • Thickness: 2"
  • Width: 8"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $348.45 ea.
  • 24″ (2 ft.) - $696.89 ea.
  • 36″ (3 ft.) - $1,045.34 ea.
  • 48″ (4 ft.) - $1,393.78 ea.
  • 60″ (5 ft.) - $1,742.23 ea.
  • 72″ (6 ft.) - $2,090.67 ea.
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.
Create Custom Cut

QTY

$348.45 ea.
$348.45 for 1
Sold and shipped by MSP Metals

0.625" X 3" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002642

0.625" X 3" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002642

Click for more details

Dimensions

  • Thickness: 0.625"
  • Width: 3"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $50.85 ea.
  • 24″ (2 ft.) - $101.69 ea.
  • 36″ (3 ft.) - $152.54 ea.
  • 48″ (4 ft.) - $203.39 ea.
  • 60″ (5 ft.) - $254.23 ea.
  • 72″ (6 ft.) - $305.08 ea.
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.
Create Custom Cut

QTY

$50.85 ea.
$50.85 for 1
Sold and shipped by MSP Metals

1" X 8" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002646

1" X 8" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002646

Click for more details

Dimensions

  • Thickness: 1"
  • Width: 8"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $196.83 ea.
  • 24″ (2 ft.) - $393.65 ea.
  • 36″ (3 ft.) - $590.48 ea.
  • 48″ (4 ft.) - $787.31 ea.
  • 60″ (5 ft.) - $984.13 ea.
  • 72″ (6 ft.) - $1,180.96 ea.
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.
Create Custom Cut

QTY

$196.83 ea.
$196.83 for 1
Sold and shipped by MSP Metals

2" X 2" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002647

2" X 2" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002647

Click for more details

Dimensions

  • Thickness: 2"
  • Width: 2"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $86.94 ea.
  • 24″ (2 ft.) - $173.88 ea.
  • 36″ (3 ft.) - $260.81 ea.
  • 48″ (4 ft.) - $347.75 ea.
  • 60″ (5 ft.) - $434.69 ea.
  • 72″ (6 ft.) - $521.63 ea.
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.
Create Custom Cut

QTY

$86.94 ea.
$86.94 for 1
Sold and shipped by MSP Metals

0.5" X 6" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002649

0.5" X 6" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002649

Click for more details

Dimensions

  • Thickness: 0.5"
  • Width: 6"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $87.90 ea.
  • 24″ (2 ft.) - $175.80 ea.
  • 36″ (3 ft.) - $263.70 ea.
  • 48″ (4 ft.) - $351.60 ea.
  • 60″ (5 ft.) - $439.50 ea.
  • 72″ (6 ft.) - $527.40 ea.
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.
Create Custom Cut

QTY

$87.90 ea.
$87.90 for 1
Sold and shipped by MSP Metals

0.5" X 1" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002651

0.5" X 1" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002651

Click for more details

Dimensions

  • Thickness: 0.5"
  • Width: 1"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $14.93 ea.
  • 24″ (2 ft.) - $29.85 ea.
  • 36″ (3 ft.) - $44.78 ea.
  • 48″ (4 ft.) - $59.71 ea.
  • 60″ (5 ft.) - $74.63 ea.
  • 72″ (6 ft.) - $89.56 ea.
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.
Create Custom Cut

QTY

$14.93 ea.
$14.93 for 1
Sold and shipped by MSP Metals

0.375" X 1" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002653

0.375" X 1" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002653

Click for more details

Dimensions

  • Thickness: 0.375"
  • Width: 1"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $13.39 ea.
  • 24″ (2 ft.) - $26.76 ea.
  • 36″ (3 ft.) - $40.15 ea.
  • 48″ (4 ft.) - $53.52 ea.
  • 60″ (5 ft.) - $66.91 ea.
  • 72″ (6 ft.) - $80.29 ea.
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.
Create Custom Cut

QTY

$13.39 ea.
$13.39 for 1
Sold and shipped by MSP Metals

0.5" X 5" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002650

0.5" X 5" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002650

Click for more details

Dimensions

  • Thickness: 0.5"
  • Width: 5"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $73.81 ea.
  • 24″ (2 ft.) - $147.61 ea.
  • 36″ (3 ft.) - $221.42 ea.
  • 48″ (4 ft.) - $295.21 ea.
  • 60″ (5 ft.) - $369.02 ea.
  • 72″ (6 ft.) - $442.82 ea.
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.
Create Custom Cut

QTY

$73.81 ea.
$73.81 for 1
Sold and shipped by MSP Metals

1" X 1.5" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002657

1" X 1.5" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002657

Click for more details

Dimensions

  • Thickness: 1"
  • Width: 1.5"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $36.86 ea.
  • 24″ (2 ft.) - $73.72 ea.
  • 36″ (3 ft.) - $110.58 ea.
  • 48″ (4 ft.) - $147.45 ea.
  • 60″ (5 ft.) - $184.31 ea.
  • 72″ (6 ft.) - $221.17 ea.
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.
Create Custom Cut

QTY

$36.86 ea.
$36.86 for 1
Sold and shipped by MSP Metals

0.625" X 6" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002658

0.625" X 6" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002658

Click for more details

Dimensions

  • Thickness: 0.625"
  • Width: 6"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $102.46 ea.
  • 24″ (2 ft.) - $204.93 ea.
  • 36″ (3 ft.) - $307.39 ea.
  • 48″ (4 ft.) - $409.85 ea.
  • 60″ (5 ft.) - $512.32 ea.
  • 72″ (6 ft.) - $614.78 ea.
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.
Create Custom Cut

QTY

$102.46 ea.
$102.46 for 1
Sold and shipped by MSP Metals

1" X 1" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002652

1" X 1" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002652

Click for more details

Dimensions

  • Thickness: 1"
  • Width: 1"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $24.34 ea.
  • 24″ (2 ft.) - $48.69 ea.
  • 36″ (3 ft.) - $73.03 ea.
  • 48″ (4 ft.) - $97.37 ea.
  • 60″ (5 ft.) - $121.71 ea.
  • 72″ (6 ft.) - $146.06 ea.
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.
Create Custom Cut

QTY

$24.34 ea.
$24.34 for 1
Sold and shipped by MSP Metals

0.25" X 3" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002662

0.25" X 3" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002662

Click for more details

Dimensions

  • Thickness: 0.25"
  • Width: 3"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $32.80 ea.
  • 24″ (2 ft.) - $65.58 ea.
  • 36″ (3 ft.) - $98.38 ea.
  • 48″ (4 ft.) - $131.16 ea.
  • 60″ (5 ft.) - $163.96 ea.
  • 72″ (6 ft.) - $196.74 ea.
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.
Create Custom Cut

QTY

$32.80 ea.
$32.80 for 1
Sold and shipped by MSP Metals

0.375" X 4" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002644

0.375" X 4" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002644

Click for more details

Dimensions

  • Thickness: 0.375"
  • Width: 4"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $54.56 ea.
  • 24″ (2 ft.) - $109.11 ea.
  • 36″ (3 ft.) - $163.67 ea.
  • 48″ (4 ft.) - $218.22 ea.
  • 60″ (5 ft.) - $272.78 ea.
  • 72″ (6 ft.) - $327.33 ea.
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.
Create Custom Cut

QTY

$54.56 ea.
$54.56 for 1
Sold and shipped by MSP Metals

0.75" X 8" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002665

0.75" X 8" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002665

Click for more details

Dimensions

  • Thickness: 0.75"
  • Width: 8"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $163.32 ea.
  • 24″ (2 ft.) - $326.65 ea.
  • 36″ (3 ft.) - $489.97 ea.
  • 48″ (4 ft.) - $653.30 ea.
  • 60″ (5 ft.) - $816.62 ea.
  • 72″ (6 ft.) - $979.95 ea.
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.
Create Custom Cut

QTY

$163.32 ea.
$163.32 for 1
Sold and shipped by MSP Metals

0.25" X 1" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002669

0.25" X 1" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002669

Click for more details

Dimensions

  • Thickness: 0.25"
  • Width: 1"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $10.94 ea.
  • 24″ (2 ft.) - $21.86 ea.
  • 36″ (3 ft.) - $32.80 ea.
  • 48″ (4 ft.) - $43.72 ea.
  • 60″ (5 ft.) - $54.66 ea.
  • 72″ (6 ft.) - $65.58 ea.
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.
Create Custom Cut

QTY

$10.94 ea.
$10.94 for 1
Sold and shipped by MSP Metals

1.25" X 12" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002670

1.25" X 12" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002670

Click for more details

Dimensions

  • Thickness: 1.25"
  • Width: 12"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $369.31 ea.
  • 24″ (2 ft.) - $738.62 ea.
  • 36″ (3 ft.) - $1,107.93 ea.
  • 48″ (4 ft.) - $1,477.24 ea.
  • 60″ (5 ft.) - $1,846.55 ea.
  • 72″ (6 ft.) - $2,215.86 ea.
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.
Create Custom Cut

QTY

$369.31 ea.
$369.31 for 1
Sold and shipped by MSP Metals

1" X 6" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002595

1" X 6" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002595

Click for more details

Dimensions

  • Thickness: 1"
  • Width: 6"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $147.45 ea.
  • 24″ (2 ft.) - $294.89 ea.
  • 36″ (3 ft.) - $442.34 ea.
  • 48″ (4 ft.) - $589.78 ea.
  • 60″ (5 ft.) - $737.23 ea.
  • 72″ (6 ft.) - $884.68 ea.
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.
Create Custom Cut

QTY

$147.45 ea.
$147.45 for 1
Sold and shipped by MSP Metals
  • 1
  • 2
  • 3

Can't find what you're looking for?

Contact us for a custom quote