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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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20mm OD x 2mm Wall x 16mm ID Alloy Steel Round Tube 4140 Metric 12" Length [+/- 2"] - 
Part #: 24668

20mm OD x 2mm Wall x 16mm ID Alloy Steel Round Tube 4140 Metric 12" Length [+/- 2"] -
Part #: 24668

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Dimensions

  • Outer Diameter: 20mm
  • Wall: 2mm
  • Inner Diameter: 16mm
See all available dimensions for this product

Pack of 5

QTY

$185.45 ea.
$185.45

14mm OD x 2mm Wall x 10mm ID Alloy Steel Round Tube 4140 Metric 36" Length [+/- 2"] - 
Part #: 24667

14mm OD x 2mm Wall x 10mm ID Alloy Steel Round Tube 4140 Metric 36" Length [+/- 2"] -
Part #: 24667

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

Dimensions

  • Outer Diameter: 14mm
  • Wall: 2mm
  • Inner Diameter: 10mm
See all available dimensions for this product

Pack of 2

QTY

$168.92 ea.
$168.92

12mm OD x 1.5mm Wall x 9mm ID Alloy Steel Round Tube 4140 Metric 36" Length [+/- 2"] - 
Part #: 24665

12mm OD x 1.5mm Wall x 9mm ID Alloy Steel Round Tube 4140 Metric 36" Length [+/- 2"] -
Part #: 24665

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

Dimensions

  • Outer Diameter: 12mm
  • Wall: 1.5mm
  • Inner Diameter: 9mm
See all available dimensions for this product

Pack of 3

QTY

$173.09 ea.
$173.09

8mm OD x 1.5mm Wall x 5mm ID Alloy Steel Round Tube 4140 Metric 36" Length [+/- 2"] - 
Part #: 24662

8mm OD x 1.5mm Wall x 5mm ID Alloy Steel Round Tube 4140 Metric 36" Length [+/- 2"] -
Part #: 24662

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 4

QTY

$172.84 ea.
$172.84

8mm OD x 1.5mm Wall x 5mm ID Alloy Steel Round Tube 4140 Metric 12" Length [+/- 2"] - 
Part #: 24661

8mm OD x 1.5mm Wall x 5mm ID Alloy Steel Round Tube 4140 Metric 12" Length [+/- 2"] -
Part #: 24661

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 10

QTY

$144.16 ea.
$144.16

12mm OD x 1.5mm Wall x 9mm ID Alloy Steel Round Tube 4140 Metric 12" Length [+/- 2"] - 
Part #: 24664

12mm OD x 1.5mm Wall x 9mm ID Alloy Steel Round Tube 4140 Metric 12" Length [+/- 2"] -
Part #: 24664

Click for more details

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

Dimensions

  • Outer Diameter: 12mm
  • Wall: 1.5mm
  • Inner Diameter: 9mm
See all available dimensions for this product

Pack of 8

QTY

$153.86 ea.
$153.86

1 1/4" Alloy Steel Hex Bar 4140/4142-Cold Finish - 
Part #: 20243

1 1/4" Alloy Steel Hex Bar 4140/4142-Cold Finish -
Part #: 20243

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

Dimensions

  • Across Flats: 1.25"
See all available dimensions for this product
  • 12″ (1 ft.) - $48.82 ea.
  • 24″ (2 ft.) - $95.00 ea.
  • 36″ (3 ft.) - $129.66 ea.

    Buy 4 at the 12 ft price!

  • 48″ (4 ft.) - $161.66 ea.
  • 72″ (6 ft.) - $228.34 ea.
  • 96″ (8 ft.) - $284.40 ea.
  • 144″ (12 ft.) - $354.02 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

$48.82 ea.
$48.82 for 1

1 1/2" Alloy Steel Hex Bar 4140/4142-Cold Finish - 
Part #: 20244

1 1/2" Alloy Steel Hex Bar 4140/4142-Cold Finish-
Part #: 20244

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

Dimensions

  • Across Flats: 1.5"
See all available dimensions for this product
Pricing and availability for this item changes frequently. Contact us now for a fast quote.

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

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

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

Dimensions

  • Across Flats: 1"
See all available dimensions for this product
  • 12″ (1 ft.) - $39.69 ea.
  • 24″ (2 ft.) - $77.26 ea.
  • 36″ (3 ft.) - $105.44 ea.

    Buy 4 at the 12 ft price!

  • 48″ (4 ft.) - $131.48 ea.
  • 72″ (6 ft.) - $185.70 ea.
  • 96″ (8 ft.) - $231.29 ea.
  • 144″ (12 ft.) - $287.89 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

$39.69 ea.
$39.69 for 1
quantity discountBuy More & Save up to 18% !
Qty
Price ea.
Savings
20+
$32.39
18%
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1 3/4" Alloy Steel Hex Bar 4140/4142-Cold Finish - 
Part #: 20246

1 3/4" Alloy Steel Hex Bar 4140/4142-Cold Finish -
Part #: 20246

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

Dimensions

  • Across Flats: 1.75"
See all available dimensions for this product
  • 12″ (1 ft.) - $89.98 ea.
  • 24″ (2 ft.) - $170.07 ea.
  • 36″ (3 ft.) - $251.16 ea.

    Buy 4 at the 12 ft price!

  • 48″ (4 ft.) - $325.64 ea.
  • 72″ (6 ft.) - $448.92 ea.
  • 96″ (8 ft.) - $574.82 ea.
  • 144″ (12 ft.) - $791.02 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

$89.98 ea.
$89.98 for 1

2 1/4" Alloy Steel Hex Bar 4140/4142-Cold Finish - 
Part #: 20248

2 1/4" Alloy Steel Hex Bar 4140/4142-Cold Finish -
Part #: 20248

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

Dimensions

  • Across Flats: 2.25"
See all available dimensions for this product
  • 12″ (1 ft.) - $127.08 ea.
  • 24″ (2 ft.) - $240.20 ea.
  • 36″ (3 ft.) - $354.71 ea.

    Buy 4 at the 12 ft price!

  • 48″ (4 ft.) - $459.92 ea.
  • 72″ (6 ft.) - $634.02 ea.
  • 96″ (8 ft.) - $811.83 ea.
  • 144″ (12 ft.) - $1,117.21 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

$127.08 ea.
$127.08 for 1

2 3/8" Alloy Steel Hex Bar 4140/4142-Cold Finish - 
Part #: 20249

2 3/8" Alloy Steel Hex Bar 4140/4142-Cold Finish-
Part #: 20249

Click for more details

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

Dimensions

  • Across Flats: 2.375"
See all available dimensions for this product
Pricing and availability for this item changes frequently. Contact us now for a fast quote.

2" Alloy Steel Hex Bar 4140/4142-Cold Finish - 
Part #: 20247

2" Alloy Steel Hex Bar 4140/4142-Cold Finish -
Part #: 20247

Click for more details

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

Dimensions

  • Across Flats: 2"
See all available dimensions for this product
  • 12″ (1 ft.) - $112.14 ea.
  • 24″ (2 ft.) - $211.94 ea.
  • 36″ (3 ft.) - $313.00 ea.

    Buy 4 at the 12 ft price!

  • 48″ (4 ft.) - $405.85 ea.
  • 72″ (6 ft.) - $559.46 ea.
  • 96″ (8 ft.) - $716.36 ea.
  • 144″ (12 ft.) - $985.84 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

$112.14 ea.
$112.14 for 1

2/ 1/2" Alloy Steel Hex Bar 4140/4142-Cold Finish - 
Part #: 20250

2/ 1/2" Alloy Steel Hex Bar 4140/4142-Cold Finish -
Part #: 20250

Click for more details

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

Dimensions

  • Across Flats: 2.5"
See all available dimensions for this product
  • 12″ (1 ft.) - $158.31 ea.
  • 24″ (2 ft.) - $299.23 ea.
  • 36″ (3 ft.) - $441.88 ea.

    Buy 4 at the 12 ft price!

  • 48″ (4 ft.) - $572.97 ea.
  • 72″ (6 ft.) - $789.85 ea.
  • 144″ (12 ft.) - $1,391.80 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

$158.31 ea.
$158.31 for 1

2 3/4" Alloy Steel Hex Bar 4140/4142-Cold Finish - 
Part #: 20251

2 3/4" Alloy Steel Hex Bar 4140/4142-Cold Finish -
Part #: 20251

Click for more details

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

Dimensions

  • Across Flats: 2.75"
See all available dimensions for this product
  • 12″ (1 ft.) - $231.04 ea.
  • 24″ (2 ft.) - $436.67 ea.
  • 36″ (3 ft.) - $644.86 ea.

    Buy 4 at the 12 ft price!

  • 48″ (4 ft.) - $836.10 ea.
  • 72″ (6 ft.) - $1,152.62 ea.
  • 144″ (12 ft.) - $2,031.02 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

$231.04 ea.
$231.04 for 1

5/8" Alloy Steel Plate 4140-Annealed - 
Part #: 9558

5/8" Alloy Steel Plate 4140-Annealed-
Part #: 9558

Click for more details

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

Dimensions

  • Thickness: 0.625"
  • Ships In: 5-7 Business 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 Plate 4140-Annealed - 
Part #: 23736

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

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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.

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.) - $78.78 ea.
  • 24″ (2 ft.) - $153.27 ea.
  • 36″ (3 ft.) - $209.20 ea.

    Buy 4 at the 12 ft price!

  • 72″ (6 ft.) - $368.42 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

$78.78 ea.
$78.78 for 1

2 1/4" Alloy Steel Round Bar 4140-Annealed Cold Finish - 
Part #: 15475

2 1/4" Alloy Steel Round Bar 4140-Annealed Cold Finish -
Part #: 15475

Click for more details

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

Dimensions

  • Diameter: 2.25"
See all available dimensions for this product
  • 12″ (1 ft.) - $137.22 ea.
  • 24″ (2 ft.) - $259.36 ea.
  • 36″ (3 ft.) - $383.00 ea.

    Buy 4 at the 12 ft price!

  • 48″ (4 ft.) - $496.60 ea.
  • 72″ (6 ft.) - $684.58 ea.
  • 96″ (8 ft.) - $876.60 ea.
  • 144″ (12 ft.) - $1,206.32 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

$137.22 ea.
$137.22 for 1

1/2" Alloy Steel Round Bar 4140-Annealed Cold Finish - 
Part #: 15484

1/2" Alloy Steel Round Bar 4140-Annealed Cold Finish -
Part #: 15484

Click for more details

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

Dimensions

  • Diameter: 0.5"
See all available dimensions for this product
  • 12″ (1 ft.) - $7.23 ea.
  • 24″ (2 ft.) - $14.03 ea.
  • 36″ (3 ft.) - $19.17 ea.

    Buy 4 at the 12 ft price!

  • 48″ (4 ft.) - $23.91 ea.
  • 72″ (6 ft.) - $33.76 ea.
  • 96″ (8 ft.) - $42.06 ea.
  • 144″ (12 ft.) - $52.35 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

$7.23 ea.
$7.23 for 1

9/16" Alloy Steel Round Bar 4140-Annealed Cold Finish - 
Part #: 15485

9/16" Alloy Steel Round Bar 4140-Annealed Cold Finish -
Part #: 15485

Click for more details

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

Dimensions

  • Diameter: 0.5625"
See all available dimensions for this product
  • 12″ (1 ft.) - $15.45 ea.
  • 24″ (2 ft.) - $30.08 ea.
  • 36″ (3 ft.) - $41.02 ea.

    Buy 4 at the 12 ft price!

  • 48″ (4 ft.) - $51.15 ea.
  • 72″ (6 ft.) - $72.26 ea.
  • 96″ (8 ft.) - $89.98 ea.
  • 144″ (12 ft.) - $112.03 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

$15.45 ea.
$15.45 for 1

5/8" Alloy Steel Round Bar 4140-Annealed Cold Finish - 
Part #: 15486

5/8" Alloy Steel Round Bar 4140-Annealed Cold Finish -
Part #: 15486

Click for more details

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

Dimensions

  • Diameter: 0.625"
See all available dimensions for this product
  • 12″ (1 ft.) - $12.50 ea.
  • 24″ (2 ft.) - $24.35 ea.
  • 36″ (3 ft.) - $33.22 ea.

    Buy 4 at the 12 ft price!

  • 48″ (4 ft.) - $41.40 ea.
  • 72″ (6 ft.) - $58.49 ea.
  • 96″ (8 ft.) - $72.83 ea.
  • 144″ (12 ft.) - $90.69 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

$12.50 ea.
$12.50 for 1

11/16" Alloy Steel Round Bar 4140-Annealed Cold Finish - 
Part #: 15487

11/16" Alloy Steel Round Bar 4140-Annealed Cold Finish -
Part #: 15487

Click for more details

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

Dimensions

  • Diameter: 0.6875"
See all available dimensions for this product
  • 12″ (1 ft.) - $21.41 ea.
  • 24″ (2 ft.) - $41.69 ea.
  • 36″ (3 ft.) - $56.89 ea.

    Buy 4 at the 12 ft price!

  • 48″ (4 ft.) - $70.93 ea.
  • 72″ (6 ft.) - $100.19 ea.
  • 96″ (8 ft.) - $124.77 ea.
  • 144″ (12 ft.) - $155.33 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

$21.41 ea.
$21.41 for 1

2" Alloy Steel Round Bar 4140-Annealed Cold Finish - 
Part #: 10587

2" Alloy Steel Round Bar 4140-Annealed Cold Finish -
Part #: 10587

Click for more details

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

Dimensions

  • Diameter: 2"
See all available dimensions for this product
  • 12″ (1 ft.) - $67.86 ea.
  • 24″ (2 ft.) - $128.25 ea.
  • 36″ (3 ft.) - $189.40 ea.

    Buy 4 at the 12 ft price!

  • 48″ (4 ft.) - $245.58 ea.
  • 72″ (6 ft.) - $338.54 ea.
  • 96″ (8 ft.) - $433.51 ea.
  • 144″ (12 ft.) - $596.56 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

$67.86 ea.
$67.86 for 1

1 3/4" Alloy Steel Round Bar 4140-Annealed Cold Finish - 
Part #: 14538

1 3/4" Alloy Steel Round Bar 4140-Annealed Cold Finish -
Part #: 14538

Click for more details

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

Dimensions

  • Diameter: 1.75"
See all available dimensions for this product
  • 12″ (1 ft.) - $78.45 ea.
  • 24″ (2 ft.) - $152.64 ea.
  • 36″ (3 ft.) - $208.36 ea.

    Buy 4 at the 12 ft price!

  • 48″ (4 ft.) - $259.80 ea.
  • 72″ (6 ft.) - $366.92 ea.
  • 96″ (8 ft.) - $457.02 ea.
  • 144″ (12 ft.) - $568.88 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

$78.45 ea.
$78.45 for 1

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