Shop all Products
Shop Aerospace Materials

Open for Orders 24/7!

Deals
Get a Quick Quote!

4140

-234 Products

4140 Product Guide Product   | 4140 Alloy Steel Tolerance Guide product

Alloy Steel 4140 has high strength, high fatigue strength, toughness, torsional strength, and impact and abrasion resistance. Additionally, 4140 steel is highly ductile when annealed, though it requires more pressure as it is tougher than most carbon steels. 4140 is easily welded, but if this is done after hardening, it will also require a post weld heat treatment. This material is typically used in aerospace, oil, gas, automotive, agricultural, and defense industries, specifically gears, shafts, spindles, fixtures, and collars.

 

We offer 4140 in round tube, metric round tube, hex bar, metric hex bar, cold finish hex bar, rectangle bar, round bar, metric round bar, sheet plate, annealed sheet plate, and precision blanks.

 

Relevant Knowledge Hub Resources: 5 Reasons to Cut-to-Size | The Weldability of Steel

Sort by

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

Close

Filters

Material

Production Method

Secondary Shape

Surface

Domestic

Temper

DFARS

seller

Shape

Can't find what you need?

Contact our experienced US-based customer service team for hard-to-source materials.


3" Alloy Steel Round Bar 4140 Cold Finished Heat Treated - 
Part #: mp-00002487

3" Alloy Steel Round Bar 4140 Cold Finished Heat Treated -
Part #: mp-00002487

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Diameter: 3"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $150.67 ea.
  • 24″ (2 ft.) - $301.32 ea.
  • 36″ (3 ft.) - $451.99 ea.
  • 48″ (4 ft.) - $602.65 ea.
  • 72″ (6 ft.) - $903.98 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

$150.67 ea.
$150.67 for 1

3" Alloy Steel Plate 4140-Annealed - 
Part #: 28459

3" Alloy Steel Plate 4140-Annealed-
Part #: 28459

Click for more details

Dimensions

  • Thickness: 3"
  • Ships In: 6-8 Buisness Days
See all available dimensions for this product
Pricing and availability for this item changes frequently. Contact us now for a fast quote.

3 1/4" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated - 
Part #: mp-00002402

3 1/4" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated -
Part #: mp-00002402

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Diameter: 3.25"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $164.42 ea.
  • 24″ (2 ft.) - $328.82 ea.
  • 72″ (6 ft.) - $986.47 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.

QTY

$164.42 ea.
$164.42 for 1

3 1/4" Alloy Steel Plate 4140-Annealed - 
Part #: 28876

3 1/4" Alloy Steel Plate 4140-Annealed-
Part #: 28876

Click for more details

Dimensions

  • Thickness: 3.25"
  • Ships In: 6-8 Buisness Days
See all available dimensions for this product
Pricing and availability for this item changes frequently. Contact us now for a fast quote.

3 3/8" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated - 
Part #: mp-00002421

3 3/8" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated -
Part #: mp-00002421

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Diameter: 3.375"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $177.51 ea.
  • 24″ (2 ft.) - $355.04 ea.
  • 72″ (6 ft.) - $1,065.10 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.

QTY

$177.51 ea.
$177.51 for 1

3 1/2" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated - 
Part #: mp-00002399

3 1/2" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated -
Part #: mp-00002399

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Diameter: 3.5"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $192.66 ea.
  • 24″ (2 ft.) - $385.33 ea.
  • 72″ (6 ft.) - $1,155.99 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.

QTY

$192.66 ea.
$192.66 for 1

3 1/2" Alloy Steel Round Bar 4140 Cold Finished Heat Treated - 
Part #: mp-00002467

3 1/2" Alloy Steel Round Bar 4140 Cold Finished Heat Treated -
Part #: mp-00002467

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Diameter: 3.5"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $205.07 ea.
  • 24″ (2 ft.) - $410.14 ea.
  • 72″ (6 ft.) - $1,230.41 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

$205.07 ea.
$205.07 for 1

3 5/8" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated - 
Part #: mp-00002484

3 5/8" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated -
Part #: mp-00002484

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Diameter: 3.625"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $204.54 ea.
  • 24″ (2 ft.) - $409.08 ea.
  • 72″ (6 ft.) - $1,227.25 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.

QTY

$204.54 ea.
$204.54 for 1

3 3/4" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated - 
Part #: mp-00002440

3 3/4" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated -
Part #: mp-00002440

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Diameter: 3.75"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $218.89 ea.
  • 24″ (2 ft.) - $437.78 ea.
  • 72″ (6 ft.) - $1,313.34 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.

QTY

$218.89 ea.
$218.89 for 1

4" Alloy Steel Plate 4140-Annealed - 
Part #: 26345

4" Alloy Steel Plate 4140-Annealed-
Part #: 26345

Click for more details

alloy-steel-sheet-4130-annealed-1superZoom

Dimensions

  • Thickness: 4"
  • Ships In: 6-8 Buisness Days
See all available dimensions for this product
Pricing and availability for this item changes frequently. Contact us now for a fast quote.

4" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated - 
Part #: mp-00002400

4" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated -
Part #: mp-00002400

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Diameter: 4"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $249.05 ea.
  • 24″ (2 ft.) - $498.10 ea.
  • 72″ (6 ft.) - $1,494.29 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.

QTY

$249.05 ea.
$249.05 for 1

4 1/4" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated - 
Part #: mp-00002459

4 1/4" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated -
Part #: mp-00002459

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Diameter: 4.25"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $299.72 ea.
  • 24″ (2 ft.) - $599.44 ea.
  • 72″ (6 ft.) - $1,798.32 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.

QTY

$299.72 ea.
$299.72 for 1

4 1/2" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated - 
Part #: mp-00002457

4 1/2" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated -
Part #: mp-00002457

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Diameter: 4.5"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $336.01 ea.
  • 24″ (2 ft.) - $672.03 ea.
  • 72″ (6 ft.) - $2,016.10 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.

QTY

$336.01 ea.
$336.01 for 1

4 3/4" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated - 
Part #: mp-00002427

4 3/4" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated -
Part #: mp-00002427

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Diameter: 4.75"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $374.39 ea.
  • 24″ (2 ft.) - $748.78 ea.
  • 72″ (6 ft.) - $2,246.34 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.

QTY

$374.39 ea.
$374.39 for 1

5mm Alloy Steel Hex Bar 4140 Metric 60" Length [+/- 2"] - 
Part #: 24513

5mm Alloy Steel Hex Bar 4140 Metric 60" Length [+/- 2"] -
Part #: 24513

Click for more details

alloy-steel-hex-bar-4140-4142-cold-finish-1superZoom

Dimensions

  • Across Flats: 5mm
See all available dimensions for this product

Pack of 8

QTY

$125.74 ea.
$125.74

5" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated - 
Part #: mp-00002424

5" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated -
Part #: mp-00002424

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Diameter: 5"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $414.84 ea.
  • 24″ (2 ft.) - $829.67 ea.
  • 72″ (6 ft.) - $2,489.01 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.

QTY

$414.84 ea.
$414.84 for 1

5" Alloy Steel Plate 4140-Annealed - 
Part #: 27449

5" Alloy Steel Plate 4140-Annealed-
Part #: 27449

Click for more details

alloy-steel-sheet-4130-annealed-1superZoom

Dimensions

  • Thickness: 5"
  • Ships In: 6-8 Buisness Days
See all available dimensions for this product
Pricing and availability for this item changes frequently. Contact us now for a fast quote.

5 1/2" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated - 
Part #: mp-00002448

5 1/2" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated -
Part #: mp-00002448

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Diameter: 5.5"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $501.95 ea.
  • 24″ (2 ft.) - $1,003.91 ea.
  • 72″ (6 ft.) - $3,011.71 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.

QTY

$501.95 ea.
$501.95 for 1

6" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated - 
Part #: mp-00002422

6" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated -
Part #: mp-00002422

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Diameter: 6"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $597.36 ea.
  • 24″ (2 ft.) - $1,194.73 ea.
  • 72″ (6 ft.) - $3,584.19 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.

QTY

$597.36 ea.
$597.36 for 1

2" Alloy Steel Plate 4140-Annealed - 
Part #: 27845

2" Alloy Steel Plate 4140-Annealed-
Part #: 27845

Click for more details

alloy-steel-sheet-4130-annealed-1superZoom

Dimensions

  • Ships In: 6-8 Buisness Days
See all available dimensions for this product
Pricing and availability for this item changes frequently. Contact us now for a fast quote.

1 3/4" Alloy Steel Plate 4140-Annealed Precision Ground - 
Part #: 27850

1 3/4" Alloy Steel Plate 4140-Annealed Precision Ground -
Part #: 27850

Click for more details

alloy-steel-sheet-4130-annealed-1superZoom

Dimensions

  • Ships In: 6-8 Buisness Days
See all available dimensions for this product
  • 12″ X 12″ (1 X 1 ft.) - $542.04 ea.
  • 12″ X 24″ (1 X 2 ft.) - $1,028.31 ea.
  • 12″ X 36″ (1 X 3 ft.) - $1,518.54 ea.
  • 12″ X 48″ (1 X 4 ft.) - $1,968.94 ea.
  • 24″ X 24″ (2 X 2 ft.) - $1,968.94 ea.
  • 24″ X 36″ (2 X 3 ft.) - $2,821.85 ea.
  • 24″ X 48″ (2 X 4 ft.) - $3,618.99 ea.
  • 36″ X 36″ (3 X 3 ft.) - $3,963.75 ea.
  • 36″ X 48″ (3 X 4 ft.) - $5,213.27 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.

QTY

$542.04 ea.
$542.04 for 1

6 1/2" Alloy Steel Round Bar 4140-Annealed Hot Rolled - 
Part #: 27951

6 1/2" Alloy Steel Round Bar 4140-Annealed Hot Rolled-
Part #: 27951

Click for more details

alloy-steel-round-bar-4140-annealed-cold-finish-1superZoom

Dimensions

  • Diameter: 6.5"
See all available dimensions for this product
Pricing and availability for this item changes frequently. Contact us now for a fast quote.

6 1/2" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated - 
Part #: mp-00002461

6 1/2" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated -
Part #: mp-00002461

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Diameter: 6.5"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $701.07 ea.
  • 24″ (2 ft.) - $1,402.15 ea.
  • 72″ (6 ft.) - $4,206.44 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.

QTY

$701.07 ea.
$701.07 for 1

6 1/2" Alloy Steel Plate 4140-Annealed - 
Part #: 28836

6 1/2" Alloy Steel Plate 4140-Annealed-
Part #: 28836

Click for more details

Dimensions

  • Thickness: 6.5"
  • Ships In: 6-8 Buisness Days
See all available dimensions for this product
Pricing and availability for this item changes frequently. Contact us now for a fast quote.

7mm Alloy Steel Hex Bar 4140 Metric 60" Length [+/- 2"] - 
Part #: 24514

7mm Alloy Steel Hex Bar 4140 Metric 60" Length [+/- 2"] -
Part #: 24514

Click for more details

alloy-steel-hex-bar-4140-4142-cold-finish-1superZoom

Dimensions

  • Across Flats: 7mm
See all available dimensions for this product

Pack of 8

QTY

$124.85 ea.
$124.85

Can't find what you're looking for?

Contact us for a custom quote