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.


0.75" X 1" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002536

0.75" X 1" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002536

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Thickness: 0.75"
  • Width: 1"
See all available dimensions for this product
  • 12″ (1 ft.) - $20.80 ea.
  • 24″ (2 ft.) - $41.60 ea.
  • 36″ (3 ft.) - $62.40 ea.
  • 48″ (4 ft.) - $83.20 ea.
  • 60″ (5 ft.) - $104.00 ea.
  • 72″ (6 ft.) - $124.80 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

$20.80 ea.
$20.80 for 1

0.75" X 1.5" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002545

0.75" X 1.5" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002545

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Thickness: 0.75"
  • Width: 1.5"
See all available dimensions for this product
  • 12″ (1 ft.) - $30.82 ea.
  • 24″ (2 ft.) - $61.63 ea.
  • 36″ (3 ft.) - $92.45 ea.
  • 48″ (4 ft.) - $123.26 ea.
  • 60″ (5 ft.) - $154.08 ea.
  • 72″ (6 ft.) - $184.90 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

$30.82 ea.
$30.82 for 1

0.75" X 2" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002556

0.75" X 2" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002556

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Thickness: 0.75"
  • Width: 2"
See all available dimensions for this product
  • 12″ (1 ft.) - $40.83 ea.
  • 24″ (2 ft.) - $81.66 ea.
  • 36″ (3 ft.) - $122.49 ea.
  • 48″ (4 ft.) - $163.32 ea.
  • 60″ (5 ft.) - $204.16 ea.
  • 72″ (6 ft.) - $244.99 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.
Create Custom Cut

QTY

$40.83 ea.
$40.83 for 1

0.75" X 3" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002560

0.75" X 3" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002560

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Thickness: 0.75"
  • Width: 3"
See all available dimensions for this product
  • 12″ (1 ft.) - $61.63 ea.
  • 24″ (2 ft.) - $123.26 ea.
  • 36″ (3 ft.) - $184.90 ea.
  • 48″ (4 ft.) - $246.53 ea.
  • 60″ (5 ft.) - $308.16 ea.
  • 72″ (6 ft.) - $369.79 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

$61.63 ea.
$61.63 for 1

0.75" X 12" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002572

0.75" X 12" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002572

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Thickness: 0.75"
  • Width: 12"
See all available dimensions for this product
  • 12″ (1 ft.) - $245.76 ea.
  • 24″ (2 ft.) - $491.52 ea.
  • 36″ (3 ft.) - $737.27 ea.
  • 48″ (4 ft.) - $983.03 ea.
  • 60″ (5 ft.) - $1,228.79 ea.
  • 72″ (6 ft.) - $1,474.55 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

$245.76 ea.
$245.76 for 1

0.75" X 6" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002587

0.75" X 6" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002587

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Thickness: 0.75"
  • Width: 6"
See all available dimensions for this product
  • 12″ (1 ft.) - $122.49 ea.
  • 24″ (2 ft.) - $244.99 ea.
  • 36″ (3 ft.) - $367.48 ea.
  • 48″ (4 ft.) - $489.97 ea.
  • 60″ (5 ft.) - $612.47 ea.
  • 72″ (6 ft.) - $734.96 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

$122.49 ea.
$122.49 for 1

0.75" X 4" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002638

0.75" X 4" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002638

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Thickness: 0.75"
  • Width: 4"
See all available dimensions for this product
  • 12″ (1 ft.) - $81.66 ea.
  • 24″ (2 ft.) - $163.32 ea.
  • 36″ (3 ft.) - $244.99 ea.
  • 48″ (4 ft.) - $326.65 ea.
  • 60″ (5 ft.) - $408.31 ea.
  • 72″ (6 ft.) - $489.97 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

$81.66 ea.
$81.66 for 1

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

Sold & shipped by MSP Metals

Dimensions

  • Thickness: 0.75"
  • Width: 8"
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

3/4" x 4" Alloy Steel Rectangle Bar 4140-Annealed - 
Part #: 28128

3/4" x 4" Alloy Steel Rectangle Bar 4140-Annealed-
Part #: 28128

Click for more details

Dimensions

  • Thickness: 0.75"
  • Width: 4"
See all available dimensions for this product
Pricing and availability for this item changes frequently. Contact us now for a fast quote.

3/4" x 1" Alloy Steel Rectangle Bar 4140-Annealed - 
Part #: 28152

3/4" x 1" Alloy Steel Rectangle Bar 4140-Annealed-
Part #: 28152

Click for more details

mild-steel-key-stock-rectangle-1superZoom

Dimensions

  • Thickness: 0.75"
  • Width: 1"
See all available dimensions for this product
Pricing and availability for this item changes frequently. Contact us now for a fast quote.

3/4" Alloy Steel Plate 4140-Annealed - 
Part #: 26921

3/4" Alloy Steel Plate 4140-Annealed-
Part #: 26921

Click for more details

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

Dimensions

  • Thickness: 0.75"
  • 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.

.750" Alloy Steel 4140 Precision Ground/Milled Blanks - 
Part #: mp-00000312

.750" Alloy Steel 4140 Precision Ground/Milled Blanks -
Part #: mp-00000312

Click for more details

Sold & shipped by TCI Precision Metals

Dimensions

  • Thickness: 0.75"
  • Ships In: 2 Business Days
  • Tolerance: All Dimensions +/- .002˝
See all available dimensions for this product
  • 2.0″ X 11.75″ (2.0 X 11.75 in.) - $107.54 ea.
  • 4.0″ X 11.75″ (4.0 X 11.75 in.) - $163.52 ea.
  • 6.0″ X 5.75″ (6.0 X 5.75 in.) - $126.31 ea.
  • 6.0″ X 11.75″ (6.0 X 11.75 in.) - $221.61 ea.
  • 12.0″ X 11.75″ (12.0 X 11.75 in.) - $412.09 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

$107.54 ea.
$107.54 for 1
quantity discountBuy More & Save up to 9% !
Qty
Price ea.
Savings
2-4
$104.31
3%
5-9
$102.16
5%
10+
$96.79
9%
More
Less

3/4" x 2" Alloy Steel Rectangle Bar 4140-Annealed - 
Part #: 28436

3/4" x 2" Alloy Steel Rectangle Bar 4140-Annealed-
Part #: 28436

Click for more details

mild-steel-key-stock-rectangle-1superZoom

Dimensions

  • Thickness: 0.75"
  • Width: 2"
See all available dimensions for this product
Pricing and availability for this item changes frequently. Contact us now for a fast quote.

3/4" Alloy Steel Hex Bar 4140 Cold Finish - 
Part #: 27936

3/4" Alloy Steel Hex Bar 4140 Cold Finish-
Part #: 27936

Click for more details

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

Dimensions

  • Across Flats: 0.75"
See all available dimensions for this product
Pricing and availability for this item changes frequently. Contact us now for a fast quote.

7/8" Alloy Steel Plate 4140-Annealed - 
Part #: 23736

7/8" Alloy Steel Plate 4140-Annealed-
Part #: 23736

Click for more details

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

Dimensions

  • Thickness: 0.875"
  • 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.

7/8" Alloy Steel Round Bar 4140-Annealed Cold Finish - 
Part #: 15489

7/8" Alloy Steel Round Bar 4140-Annealed Cold Finish -
Part #: 15489

Click for more details

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

Dimensions

  • Diameter: 0.875"
See all available dimensions for this product
  • 12″ (1 ft.) - $25.87 ea.
  • 24″ (2 ft.) - $50.37 ea.
  • 36″ (3 ft.) - $68.76 ea.
  • 48″ (4 ft.) - $85.72 ea.
  • 72″ (6 ft.) - $121.07 ea.
  • 96″ (8 ft.) - $150.78 ea.
  • 144″ (12 ft.) - $187.70 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

$25.87 ea.
$25.87 for 1

7/8" Alloy Steel Round Bar 4140 Cold Finished Heat Treated - 
Part #: mp-00002395

7/8" Alloy Steel Round Bar 4140 Cold Finished Heat Treated -
Part #: mp-00002395

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Diameter: 0.875"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $15.12 ea.
  • 24″ (2 ft.) - $30.24 ea.
  • 36″ (3 ft.) - $45.37 ea.
  • 48″ (4 ft.) - $60.49 ea.
  • 72″ (6 ft.) - $90.73 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

$15.12 ea.
$15.12 for 1

1" Alloy Steel Hex Bar 4140/4142-Cold Finish - 
Part #: 20242

1" Alloy Steel Hex Bar 4140/4142-Cold Finish -
Part #: 20242

Click for more details

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

Dimensions

  • Across Flats: 1"
See all available dimensions for this product
  • 12″ (1 ft.) - $41.59 ea.
  • 24″ (2 ft.) - $80.98 ea.
  • 36″ (3 ft.) - $110.50 ea.
  • 48″ (4 ft.) - $137.80 ea.
  • 72″ (6 ft.) - $194.63 ea.
  • 96″ (8 ft.) - $242.41 ea.
  • 144″ (12 ft.) - $301.73 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

$41.59 ea.
$41.59 for 1

1" x 2" Alloy Steel Rectangle Bar 4140 - 
Part #: 23254

1" x 2" Alloy Steel Rectangle Bar 4140 -
Part #: 23254

Click for more details

mild-steel-key-stock-rectangle-1superZoom

Dimensions

  • Thickness: 1"
  • Width: 2"
See all available dimensions for this product
  • 12″ (1 ft.) - $110.41 ea.
  • 24″ (2 ft.) - $214.80 ea.
  • 36″ (3 ft.) - $293.18 ea.
  • 72″ (6 ft.) - $516.32 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.
Create Custom Cut

QTY

$110.41 ea.
$110.41 for 1

1" Alloy Steel Round Bar 4140-Annealed Cold Finish - 
Part #: 19799

1" Alloy Steel Round Bar 4140-Annealed Cold Finish -
Part #: 19799

Click for more details

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

Dimensions

  • Diameter: 1"
See all available dimensions for this product
  • 12″ (1 ft.) - $21.61 ea.
  • 24″ (2 ft.) - $42.01 ea.
  • 36″ (3 ft.) - $57.36 ea.
  • 48″ (4 ft.) - $71.50 ea.
  • 72″ (6 ft.) - $100.99 ea.
  • 96″ (8 ft.) - $125.78 ea.
  • 144″ (12 ft.) - $156.57 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

$21.61 ea.
$21.61 for 1

1" Alloy Steel Round Bar 4140 Cold Finished Heat Treated - 
Part #: mp-00002410

1" Alloy Steel Round Bar 4140 Cold Finished Heat Treated -
Part #: mp-00002410

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Diameter: 1"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $16.75 ea.
  • 24″ (2 ft.) - $33.48 ea.
  • 36″ (3 ft.) - $50.23 ea.
  • 48″ (4 ft.) - $66.96 ea.
  • 72″ (6 ft.) - $100.44 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.
Create Custom Cut

QTY

$16.75 ea.
$16.75 for 1

1" X 3". Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002554

1" X 3". Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002554

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Thickness: 1"
  • Width: 3"
See all available dimensions for this product
  • 12″ (1 ft.) - $73.72 ea.
  • 24″ (2 ft.) - $147.45 ea.
  • 36″ (3 ft.) - $221.17 ea.
  • 48″ (4 ft.) - $294.89 ea.
  • 60″ (5 ft.) - $368.62 ea.
  • 72″ (6 ft.) - $442.34 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

$73.72 ea.
$73.72 for 1

1" X 2" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002566

1" X 2" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002566

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Thickness: 1"
  • Width: 2"
See all available dimensions for this product
  • 12″ (1 ft.) - $49.38 ea.
  • 24″ (2 ft.) - $98.76 ea.
  • 36″ (3 ft.) - $148.14 ea.
  • 48″ (4 ft.) - $197.52 ea.
  • 60″ (5 ft.) - $246.90 ea.
  • 72″ (6 ft.) - $296.28 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

$49.38 ea.
$49.38 for 1

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

Sold & shipped by MSP Metals

Dimensions

  • Thickness: 1"
  • Width: 6"
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

1" X 4" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002628

1" X 4" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002628

Click for more details

Sold & shipped by MSP Metals

Dimensions

  • Thickness: 1"
  • Width: 4"
See all available dimensions for this product
  • 12″ (1 ft.) - $98.76 ea.
  • 24″ (2 ft.) - $197.52 ea.
  • 36″ (3 ft.) - $296.28 ea.
  • 48″ (4 ft.) - $395.04 ea.
  • 60″ (5 ft.) - $493.81 ea.
  • 72″ (6 ft.) - $592.57 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

$98.76 ea.
$98.76 for 1

Can't find what you're looking for?

Contact us for a custom quote