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4140

-229 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

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2 3/4" Alloy Steel Round Bar 4140-Annealed Cold Finish - 
Part #: 15492

2 3/4" Alloy Steel Round Bar 4140-Annealed Cold Finish -
Part #: 15492

Click for more details

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

Dimensions

  • Diameter: 2.75"
See all available dimensions for this product
  • 12″ (1 ft.) - $123.93 ea.
  • 24″ (2 ft.) - $234.27 ea.
  • 36″ (3 ft.) - $345.95 ea.

    Buy 4 at the 12 ft price!

  • 48″ (4 ft.) - $448.54 ea.
  • 72″ (6 ft.) - $618.34 ea.
  • 144″ (12 ft.) - $1,089.59 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

$123.93 ea.
$123.93 for 1

1 5/8" Alloy Steel Round Bar 4140-Annealed Cold Finish - 
Part #: 17849

1 5/8" Alloy Steel Round Bar 4140-Annealed Cold Finish -
Part #: 17849

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

Dimensions

  • Diameter: 1.625"
See all available dimensions for this product
  • 12″ (1 ft.) - $59.88 ea.
  • 24″ (2 ft.) - $116.53 ea.
  • 36″ (3 ft.) - $159.04 ea.

    Buy 4 at the 12 ft price!

  • 48″ (4 ft.) - $198.29 ea.
  • 72″ (6 ft.) - $280.08 ea.
  • 96″ (8 ft.) - $348.82 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

$59.88 ea.
$59.88 for 1

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

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

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

Dimensions

  • Diameter: 1"
See all available dimensions for this product
  • 12″ (1 ft.) - $20.62 ea.
  • 24″ (2 ft.) - $40.08 ea.
  • 36″ (3 ft.) - $54.72 ea.

    Buy 4 at the 12 ft price!

  • 48″ (4 ft.) - $68.22 ea.
  • 72″ (6 ft.) - $96.36 ea.
  • 96″ (8 ft.) - $120.01 ea.
  • 144″ (12 ft.) - $149.39 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

$20.62 ea.
$20.62 for 1

1 1/4" Alloy Steel Round Bar 4140-Annealed Cold Finish - 
Part #: 19800

1 1/4" Alloy Steel Round Bar 4140-Annealed Cold Finish -
Part #: 19800

Click for more details

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

Dimensions

  • Diameter: 1.25"
See all available dimensions for this product
  • 12″ (1 ft.) - $33.08 ea.
  • 24″ (2 ft.) - $64.37 ea.
  • 36″ (3 ft.) - $87.85 ea.

    Buy 4 at the 12 ft price!

  • 48″ (4 ft.) - $109.54 ea.
  • 72″ (6 ft.) - $154.71 ea.
  • 96″ (8 ft.) - $192.69 ea.
  • 144″ (12 ft.) - $239.87 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

$33.08 ea.
$33.08 for 1

3/4" Alloy Steel Round Bar 4140-Annealed Cold Finish - 
Part #: 15488

3/4" Alloy Steel Round Bar 4140-Annealed Cold Finish -
Part #: 15488

Click for more details

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

Dimensions

  • Diameter: 0.75"
See all available dimensions for this product
  • 12″ (1 ft.) - $17.94 ea.
  • 24″ (2 ft.) - $34.89 ea.
  • 36″ (3 ft.) - $47.63 ea.

    Buy 4 at the 12 ft price!

  • 48″ (4 ft.) - $59.38 ea.
  • 72″ (6 ft.) - $83.88 ea.
  • 96″ (8 ft.) - $104.47 ea.
  • 144″ (12 ft.) - $130.02 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

$17.94 ea.
$17.94 for 1

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.) - $24.68 ea.
  • 24″ (2 ft.) - $48.06 ea.
  • 36″ (3 ft.) - $65.60 ea.

    Buy 4 at the 12 ft price!

  • 48″ (4 ft.) - $81.79 ea.
  • 72″ (6 ft.) - $115.51 ea.
  • 96″ (8 ft.) - $143.86 ea.
  • 144″ (12 ft.) - $179.09 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

$24.68 ea.
$24.68 for 1

1 1/2" Alloy Steel Round Bar 4140-Annealed Cold Finish - 
Part #: 15490

1 1/2" Alloy Steel Round Bar 4140-Annealed Cold Finish -
Part #: 15490

Click for more details

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

Dimensions

  • Diameter: 1.5"
See all available dimensions for this product
  • 12″ (1 ft.) - $46.61 ea.
  • 24″ (2 ft.) - $90.72 ea.
  • 36″ (3 ft.) - $123.81 ea.

    Buy 4 at the 12 ft price!

  • 48″ (4 ft.) - $154.39 ea.
  • 72″ (6 ft.) - $218.07 ea.
  • 96″ (8 ft.) - $271.60 ea.
  • 144″ (12 ft.) - $338.08 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

$46.61 ea.
$46.61 for 1
SALE! Save BIG on end of Year Deals!

1 7/8" Alloy Steel Round Bar 4140-Annealed Cold Finish - 
Part #: 15491

1 7/8" Alloy Steel Round Bar 4140-Annealed Cold Finish -
Part #: 15491

Click for more details

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

Dimensions

  • Diameter: 1.875"
See all available dimensions for this product
  • 12″ (1 ft.) - $70.57 ea.
  • 24″ (2 ft.) - $133.39 ea.
  • 36″ (3 ft.) - $196.98 ea.

    Buy 4 at the 12 ft price!

  • 48″ (4 ft.) - $255.40 ea.
  • 72″ (6 ft.) - $352.08 ea.
  • 96″ (8 ft.) - $450.82 ea.
  • 144″ (12 ft.) - $620.40 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

$70.57 ea.
$70.57 for 1
SALE! Save BIG on end of Year Deals!

2 3/4" Alloy Steel Round Bar 4140-Annealed Hot Rolled - 
Part #: 26220

2 3/4" Alloy Steel Round Bar 4140-Annealed Hot Rolled -
Part #: 26220

Click for more details

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

Dimensions

  • Diameter: 2.75"
See all available dimensions for this product
  • 12″ (1 ft.) - $137.95 ea.
  • 24″ (2 ft.) - $260.71 ea.
  • 36″ (3 ft.) - $385.01 ea.

    Buy 4 at the 12 ft price!

  • 48″ (4 ft.) - $499.19 ea.
  • 72″ (6 ft.) - $688.15 ea.
  • 96″ (8 ft.) - $881.16 ea.
  • 144″ (12 ft.) - $1,212.60 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

$137.95 ea.
$137.95 for 1

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

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

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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.

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

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

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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

14mm Alloy Steel Hex Bar 4140 Metric 60" Length [+/- 2"] - 
Part #: 24519

14mm Alloy Steel Hex Bar 4140 Metric 60" Length [+/- 2"] -
Part #: 24519

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

Dimensions

  • Across Flats: 14mm
See all available dimensions for this product

Pack of 2

QTY

$169.74 ea.
$169.74

20mm Alloy Steel Hex Bar 4140 Metric 60" Length [+/- 2"] - 
Part #: 24522

20mm Alloy Steel Hex Bar 4140 Metric 60" Length [+/- 2"] -
Part #: 24522

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

Dimensions

  • Across Flats: 20mm
See all available dimensions for this product

Pack of 1

QTY

$239.20 ea.
$239.20

27mm Alloy Steel Hex Bar 4140 Metric 60" Length [+/- 2"] - 
Part #: 24525

27mm Alloy Steel Hex Bar 4140 Metric 60" Length [+/- 2"] -
Part #: 24525

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

Dimensions

  • Across Flats: 27mm
See all available dimensions for this product

Pack of 1

QTY

$272.53 ea.
$272.53

24mm Alloy Steel Hex Bar 4140 Metric 60" Length [+/- 2"] - 
Part #: 24524

24mm Alloy Steel Hex Bar 4140 Metric 60" Length [+/- 2"] -
Part #: 24524

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

Dimensions

  • Across Flats: 24mm
See all available dimensions for this product

Pack of 1

QTY

$296.83 ea.
$296.83

22mm Alloy Steel Hex Bar 4140 Metric 60" Length [+/- 2"] - 
Part #: 24523

22mm Alloy Steel Hex Bar 4140 Metric 60" Length [+/- 2"] -
Part #: 24523

Click for more details

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

Dimensions

  • Across Flats: 22mm
See all available dimensions for this product

Pack of 1

QTY

$249.47 ea.
$249.47

30mm Alloy Steel Hex Bar 4140 Metric 60" Length [+/- 2"] - 
Part #: 24526

30mm Alloy Steel Hex Bar 4140 Metric 60" Length [+/- 2"] -
Part #: 24526

Click for more details

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

Dimensions

  • Across Flats: 30mm
See all available dimensions for this product

Pack of 1

QTY

$368.84 ea.
$368.84

50mm Alloy Steel Hex Bar 4140 Metric 60" Length [+/- 2"] - 
Part #: 24527

50mm Alloy Steel Hex Bar 4140 Metric 60" Length [+/- 2"] -
Part #: 24527

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

Dimensions

  • Across Flats: 50mm
See all available dimensions for this product

Pack of 1

QTY

$557.36 ea.
$557.36

7mm Alloy Steel Round Bar 4140- TGP Metric 36" Length [+/- 2"] - 
Part #: 24538

7mm Alloy Steel Round Bar 4140- TGP Metric 36" Length [+/- 2"] -
Part #: 24538

Click for more details

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

Dimensions

  • Diameter: 7mm
See all available dimensions for this product

Pack of 4

QTY

$199.76 ea.
$199.76

8mm OD x 1.5mm Wall x 5mm ID Alloy Steel Round Tube 4140 Metric 72" Length [+/- 2"] - 
Part #: 24663

8mm OD x 1.5mm Wall x 5mm ID Alloy Steel Round Tube 4140 Metric 72" Length [+/- 2"] -
Part #: 24663

Click for more details

alloy-steel-round-tube-4130-1superZoom

Dimensions

  • Outer Diameter: 8mm
  • Wall: 1.5mm
  • Inner Diameter: 5mm
See all available dimensions for this product

Pack of 2

QTY

$172.80 ea.
$172.80

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.

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.

1 3/8" Alloy Steel Hex Bar 4140/4142-Cold Finish - 
Part #: 27980

1 3/8" Alloy Steel Hex Bar 4140/4142-Cold Finish-
Part #: 27980

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Dimensions

  • Across Flats: 1.375"
See all available dimensions for this product
Pricing and availability for this item changes frequently. Contact us now for a fast quote.

3/8" x 1" Alloy Steel Rectangle Bar 4140 - 
Part #: 28042

3/8" x 1" Alloy Steel Rectangle Bar 4140-
Part #: 28042

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

Dimensions

  • Thickness: 0.375"
  • Width: 1"
See all available dimensions for this product
Pricing and availability for this item changes frequently. Contact us now for a fast quote.

2 1/4" Alloy Steel Plate 4140-Annealed - 
Part #: 28052

2 1/4" Alloy Steel Plate 4140-Annealed-
Part #: 28052

Click for more details

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

Dimensions

  • Thickness: 2.25"
  • 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.

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