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!

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

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

Production Method

Secondary Shape

Surface

Domestic

DFARS

seller

Material

Shape

Online Metals #1 in Freight Shipping!

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

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" 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.) - $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%
More
Less

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

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.

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

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" Alloy Steel Plate 4140-Annealed - 
Part #: 27510

1" Alloy Steel Plate 4140-Annealed-
Part #: 27510

Click for more details

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

Dimensions

  • Thickness: 1"
  • 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.

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.

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

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
Sold and shipped by MSP Metals

2" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated - 
Part #: mp-00002391

2" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated -
Part #: mp-00002391

Click for more details

Dimensions

  • Diameter: 2"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $62.26 ea.
  • 24″ (2 ft.) - $124.53 ea.
  • 36″ (3 ft.) - $186.79 ea.
  • 48″ (4 ft.) - $249.05 ea.
  • 72″ (6 ft.) - $373.57 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.

QTY

$62.26 ea.
$62.26 for 1
Sold and shipped by MSP Metals

3/4" Alloy Steel Round Bar 4140 Cold Finished Heat Treated - 
Part #: mp-00002397

3/4" Alloy Steel Round Bar 4140 Cold Finished Heat Treated -
Part #: mp-00002397

Click for more details

Dimensions

  • Diameter: 0.75"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $13.17 ea.
  • 24″ (2 ft.) - $26.35 ea.
  • 36″ (3 ft.) - $39.53 ea.
  • 48″ (4 ft.) - $52.70 ea.
  • 72″ (6 ft.) - $79.05 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

$13.17 ea.
$13.17 for 1
Sold and shipped by MSP Metals

3" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated - 
Part #: mp-00002398

3" Alloy Steel Round Bar 4140 Hot Rolled Heat Treated -
Part #: mp-00002398

Click for more details

Dimensions

  • Diameter: 3"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $140.10 ea.
  • 24″ (2 ft.) - $280.18 ea.
  • 36″ (3 ft.) - $420.27 ea.
  • 48″ (4 ft.) - $560.36 ea.
  • 72″ (6 ft.) - $840.54 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

$140.10 ea.
$140.10 for 1
Sold and shipped by MSP Metals

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

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
Sold and shipped by MSP Metals

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

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
Sold and shipped by MSP Metals

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

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
Sold and shipped by MSP Metals

1 1/2" Alloy Steel Round Bar 4140 Cold Finished Heat Treated - 
Part #: mp-00002404

1 1/2" Alloy Steel Round Bar 4140 Cold Finished Heat Treated -
Part #: mp-00002404

Click for more details

Dimensions

  • Diameter: 1.5"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $37.66 ea.
  • 24″ (2 ft.) - $75.33 ea.
  • 36″ (3 ft.) - $112.99 ea.
  • 48″ (4 ft.) - $150.67 ea.
  • 72″ (6 ft.) - $225.99 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

$37.66 ea.
$37.66 for 1
Sold and shipped by MSP Metals

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

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
Sold and shipped by MSP Metals

1 5/8" Alloy Steel Round Bar 4140 Cold Finished Heat Treated - 
Part #: mp-00002412

1 5/8" Alloy Steel Round Bar 4140 Cold Finished Heat Treated -
Part #: mp-00002412

Click for more details

Dimensions

  • Diameter: 1.625"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $44.20 ea.
  • 24″ (2 ft.) - $88.41 ea.
  • 36″ (3 ft.) - $132.62 ea.
  • 48″ (4 ft.) - $176.82 ea.
  • 72″ (6 ft.) - $265.23 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

$44.20 ea.
$44.20 for 1
Sold and shipped by MSP Metals

2 3/4" Alloy Steel Round Bar 4140 Cold Finished Heat Treated - 
Part #: mp-00002413

2 3/4" Alloy Steel Round Bar 4140 Cold Finished Heat Treated -
Part #: mp-00002413

Click for more details

Dimensions

  • Diameter: 2.75"
  • Ships In: 1 Business Day
See all available dimensions for this product
  • 12″ (1 ft.) - $129.91 ea.
  • 24″ (2 ft.) - $259.82 ea.
  • 36″ (3 ft.) - $389.73 ea.
  • 48″ (4 ft.) - $519.63 ea.
  • 72″ (6 ft.) - $779.46 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

$129.91 ea.
$129.91 for 1
Sold and shipped by MSP Metals

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

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
Sold and shipped by MSP Metals

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

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
Sold and shipped by MSP Metals

Can't find what you're looking for?

Contact us for a custom quote