Cart Over $1000? Contact Us Now for Further Discounts on Large Orders!


Shop all Products
Shop Aerospace Materials

Open for Orders 24/7!

Deals
Get a Quick Quote!

4340

-89 Products

4340 Product Guide Product   | 4340 Alloy Steel Tolerance Guide product

Alloy Steel 4340 steel has high strength, toughness, wear resistance, and fatigue strength. It can be machined in all states other than hardened and it is easily welded. Additionally, 4340 can be cold worked easily in the annealed state. This material is typically used in military aircraft, automotive systems, hydraulic parts, machine tools, and a steel crankshafts.

 

We carry 4330 alloy steel in hex bar, rectangle bar, square bar, round bar & sheet/plate.

 

NEW! - We offer waterjet services for this product. Learn More | Request Quote >

 

Relevant Knowledge Hub Resources: 5 Reasons to Cut-to-Size | Understanding Steel

Aerospace Icon Aerospace Grade Store

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

Temper

Shape

Can't find what you need?

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


1/4" Alloy Steel Plate 4340 Annealed - 
Part #: 25339

1/4" Alloy Steel Plate 4340 Annealed-
Part #: 25339

Click for more details

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

Dimensions

  • Thickness: 0.25"
See all available dimensions for this product
Pricing and availability for this item changes frequently. Contact us now for a fast quote.

1/4" x 2" Alloy Steel Rectangle Bar 4340 Cold Drawn - 
Part #: 25678

1/4" x 2" Alloy Steel Rectangle Bar 4340 Cold Drawn -
Part #: 25678

Click for more details

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

Dimensions

  • Thickness: 0.25"
  • Width: 2"
See all available dimensions for this product
  • 12″ (1 ft.) - $40.81 ea.
  • 24″ (2 ft.) - $79.35 ea.
  • 36″ (3 ft.) - $108.34 ea.
  • 48″ (4 ft.) - $135.05 ea.
  • 72″ (6 ft.) - $190.75 ea.
  • 96″ (8 ft.) - $237.58 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

$40.81 ea.
$40.81 for 1

5/16" Alloy Steel Round Bar 4340-Normalized Cold Finish - 
Part #: 23268

5/16" Alloy Steel Round Bar 4340-Normalized Cold Finish-
Part #: 23268

Click for more details

alloy-steel-round-bar-4340-normalized-cold-finished-turned-1superZoom

Dimensions

  • Diameter: 0.3125"
See all available dimensions for this product
Pricing and availability for this item changes frequently. Contact us now for a fast quote.

3/8" Alloy Steel Round Bar 4340-Normalized Cold Finish - 
Part #: 7383

3/8" Alloy Steel Round Bar 4340-Normalized Cold Finish -
Part #: 7383

Click for more details

alloy-steel-round-bar-4340-normalized-cold-finished-turned-1superZoom

Dimensions

  • Diameter: 0.375"
See all available dimensions for this product
  • 12″ (1 ft.) - $10.50 ea.
  • 24″ (2 ft.) - $20.46 ea.
  • 36″ (3 ft.) - $27.91 ea.
  • 48″ (4 ft.) - $34.83 ea.
  • 72″ (6 ft.) - $49.18 ea.
  • 96″ (8 ft.) - $61.26 ea.
  • 144″ (12 ft.) - $76.26 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

$10.50 ea.
$10.50 for 1

3/8" Alloy Steel Plate 4340 Annealed - 
Part #: 27629

3/8" Alloy Steel Plate 4340 Annealed-
Part #: 27629

Click for more details

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

Dimensions

  • Thickness: 0.375"
  • 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.

7/16" Alloy Steel Round Bar 4340-Normalized Cold Finish - 
Part #: 7384

7/16" Alloy Steel Round Bar 4340-Normalized Cold Finish -
Part #: 7384

Click for more details

alloy-steel-round-bar-4340-normalized-cold-finished-turned-1superZoom

Dimensions

  • Diameter: 0.4375"
See all available dimensions for this product
  • 12″ (1 ft.) - $40.61 ea.
  • 24″ (2 ft.) - $76.77 ea.
  • 36″ (3 ft.) - $113.37 ea.
  • 48″ (4 ft.) - $147.00 ea.
  • 72″ (6 ft.) - $202.64 ea.
  • 96″ (8 ft.) - $259.49 ea.
  • 144″ (12 ft.) - $357.08 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

$40.61 ea.
$40.61 for 1

1/2" Alloy Steel Round Bar 4340-Normalized Cold Finish - 
Part #: 7385

1/2" Alloy Steel Round Bar 4340-Normalized Cold Finish -
Part #: 7385

Click for more details

alloy-steel-round-bar-4340-normalized-cold-finished-turned-1superZoom

Dimensions

  • Diameter: 0.5"
See all available dimensions for this product
  • 12″ (1 ft.) - $15.19 ea.
  • 24″ (2 ft.) - $29.55 ea.
  • 36″ (3 ft.) - $40.31 ea.
  • 48″ (4 ft.) - $50.26 ea.
  • 72″ (6 ft.) - $71.00 ea.
  • 96″ (8 ft.) - $88.42 ea.
  • 144″ (12 ft.) - $110.07 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

$15.19 ea.
$15.19 for 1

1/2" Alloy Steel Round Bar 4340-Annealed Cold Finish - 
Part #: 25262

1/2" Alloy Steel Round Bar 4340-Annealed Cold Finish -
Part #: 25262

Click for more details

alloy-steel-round-bar-4340-normalized-cold-finished-turned-1superZoom

Dimensions

  • Diameter: 0.5"
See all available dimensions for this product
  • 12″ (1 ft.) - $9.45 ea.
  • 24″ (2 ft.) - $18.39 ea.
  • 36″ (3 ft.) - $25.10 ea.
  • 48″ (4 ft.) - $31.30 ea.
  • 72″ (6 ft.) - $44.21 ea.
  • 96″ (8 ft.) - $55.06 ea.
  • 144″ (12 ft.) - $68.54 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

$9.45 ea.
$9.45 for 1

1/2" Alloy Steel Plate 4340 Annealed - 
Part #: 25340

1/2" Alloy Steel Plate 4340 Annealed-
Part #: 25340

Click for more details

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

Dimensions

  • Thickness: 0.5"
See all available dimensions for this product
Pricing and availability for this item changes frequently. Contact us now for a fast quote.

1/2" x 2" Alloy Steel Rectangle Bar 4340 Cold Drawn - 
Part #: 25679

1/2" x 2" Alloy Steel Rectangle Bar 4340 Cold Drawn -
Part #: 25679

Click for more details

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

Dimensions

  • Thickness: 0.5"
  • Width: 2"
See all available dimensions for this product
  • 12″ (1 ft.) - $75.08 ea.
  • 24″ (2 ft.) - $146.08 ea.
  • 36″ (3 ft.) - $199.35 ea.
  • 48″ (4 ft.) - $248.57 ea.
  • 72″ (6 ft.) - $351.10 ea.
  • 96″ (8 ft.) - $437.28 ea.
  • 144″ (12 ft.) - $544.35 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.

QTY

$75.08 ea.
$75.08 for 1

1/2" Alloy Steel Hex Bar 4340 Cold Finished, Normalized & Tempered - 
Part #: 27933

1/2" Alloy Steel Hex Bar 4340 Cold Finished, Normalized & Tempered -
Part #: 27933

Click for more details

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

Dimensions

  • Across Flats: 0.5"
See all available dimensions for this product
  • 12″ (1 ft.) - $13.60 ea.
  • 24″ (2 ft.) - $26.50 ea.
  • 36″ (3 ft.) - $36.16 ea.
  • 48″ (4 ft.) - $45.09 ea.
  • 72″ (6 ft.) - $63.67 ea.
  • 96″ (8 ft.) - $79.31 ea.
  • 144″ (12 ft.) - $98.73 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

$13.60 ea.
$13.60 for 1

1/2" Alloy Steel Hex Bar 4340-Normalized - 
Part #: 13587

1/2" Alloy Steel Hex Bar 4340-Normalized -
Part #: 13587

Click for more details

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

Dimensions

  • Across Flats: 0.5"
See all available dimensions for this product
  • 12″ (1 ft.) - $17.68 ea.
  • 24″ (2 ft.) - $34.40 ea.
  • 36″ (3 ft.) - $46.95 ea.
  • 48″ (4 ft.) - $58.53 ea.
  • 72″ (6 ft.) - $82.65 ea.
  • 96″ (8 ft.) - $102.95 ea.
  • 144″ (12 ft.) - $128.16 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

$17.68 ea.
$17.68 for 1

1/2" x 3" Alloy Steel Rectangle Bar 4340 Normalized, Tempered, and Cold Drawn - 
Part #: 28842

1/2" x 3" Alloy Steel Rectangle Bar 4340 Normalized, Tempered, and Cold Drawn-
Part #: 28842

Click for more details

Placeholder for future product image

Dimensions

  • Thickness: 0.5"
  • Width: 3"
See all available dimensions for this product
Pricing and availability for this item changes frequently. Contact us now for a fast quote.

5/8" Alloy Steel Round Bar 4340-Normalized Cold Finish - 
Part #: 7387

5/8" Alloy Steel Round Bar 4340-Normalized Cold Finish -
Part #: 7387

Click for more details

alloy-steel-round-bar-4340-normalized-cold-finished-turned-1superZoom

Dimensions

  • Diameter: 0.625"
See all available dimensions for this product
  • 12″ (1 ft.) - $34.10 ea.
  • 24″ (2 ft.) - $66.34 ea.
  • 36″ (3 ft.) - $90.55 ea.
  • 48″ (4 ft.) - $112.89 ea.
  • 72″ (6 ft.) - $159.46 ea.
  • 96″ (8 ft.) - $198.60 ea.
  • 144″ (12 ft.) - $247.21 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

$34.10 ea.
$34.10 for 1

5/8" Alloy Steel Hex Bar 4340 Cold Finished, Normalized & Tempered - 
Part #: 27781

5/8" Alloy Steel Hex Bar 4340 Cold Finished, Normalized & Tempered -
Part #: 27781

Click for more details

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

Dimensions

  • Across Flats: 0.625"
See all available dimensions for this product
  • 12″ (1 ft.) - $21.40 ea.
  • 24″ (2 ft.) - $41.66 ea.
  • 36″ (3 ft.) - $56.84 ea.
  • 48″ (4 ft.) - $70.90 ea.
  • 72″ (6 ft.) - $100.12 ea.
  • 96″ (8 ft.) - $124.70 ea.
  • 144″ (12 ft.) - $155.24 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

$21.40 ea.
$21.40 for 1

5/8" Alloy Steel Plate 4340 Annealed - 
Part #: 27499

5/8" Alloy Steel Plate 4340 Annealed-
Part #: 27499

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.

3/4" x 1" Alloy Steel Rectangle Bar 4340 - 
Part #: 12788

3/4" x 1" Alloy Steel Rectangle Bar 4340 -
Part #: 12788

Click for more details

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

Dimensions

  • Thickness: 0.75"
  • Width: 1"
See all available dimensions for this product
  • 12″ (1 ft.) - $169.90 ea.
  • 24″ (2 ft.) - $330.60 ea.
  • 36″ (3 ft.) - $451.22 ea.
  • 48″ (4 ft.) - $562.60 ea.
  • 72″ (6 ft.) - $794.64 ea.
  • 84″ (7 ft.) - $447.58 ea.
  • 96″ (8 ft.) - $989.71 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.
Create Custom Cut

QTY

$169.90 ea.
$169.90 for 1

3/4" Alloy Steel Round Bar 4340-Normalized Cold Finish - 
Part #: 7388

3/4" Alloy Steel Round Bar 4340-Normalized Cold Finish -
Part #: 7388

Click for more details

alloy-steel-round-bar-4340-normalized-cold-finished-turned-1superZoom

Dimensions

  • Diameter: 0.75"
See all available dimensions for this product
  • 12″ (1 ft.) - $42.39 ea.
  • 24″ (2 ft.) - $82.45 ea.
  • 36″ (3 ft.) - $112.54 ea.
  • 48″ (4 ft.) - $140.32 ea.
  • 72″ (6 ft.) - $198.17 ea.
  • 96″ (8 ft.) - $246.82 ea.
  • 144″ (12 ft.) - $307.25 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.
Create Custom Cut

QTY

$42.39 ea.
$42.39 for 1

3/4" Alloy Steel Round Bar 4340-Annealed Cold Finish - 
Part #: 25263

3/4" Alloy Steel Round Bar 4340-Annealed Cold Finish -
Part #: 25263

Click for more details

alloy-steel-round-bar-4340-normalized-cold-finished-turned-1superZoom

Dimensions

  • Diameter: 0.75"
See all available dimensions for this product
  • 12″ (1 ft.) - $31.93 ea.
  • 24″ (2 ft.) - $62.12 ea.
  • 36″ (3 ft.) - $84.79 ea.
  • 48″ (4 ft.) - $105.73 ea.
  • 72″ (6 ft.) - $149.33 ea.
  • 96″ (8 ft.) - $185.99 ea.
  • 144″ (12 ft.) - $231.52 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

$31.93 ea.
$31.93 for 1

3/4" Alloy Steel Plate 4340 Annealed - 
Part #: 25341

3/4" Alloy Steel Plate 4340 Annealed-
Part #: 25341

Click for more details

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

Dimensions

  • Thickness: 0.75"
  • 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.

3/4" x 1 1/2" Alloy Steel Rectangle Bar 4340 - 
Part #: 26418

3/4" x 1 1/2" Alloy Steel Rectangle Bar 4340-
Part #: 26418

Click for more details

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

Dimensions

  • Thickness: 0.75"
  • Width: 1.5"
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 4340-Normalized Cold Finish - 
Part #: 7389

7/8" Alloy Steel Round Bar 4340-Normalized Cold Finish -
Part #: 7389

Click for more details

alloy-steel-round-bar-4340-normalized-cold-finished-turned-1superZoom

Dimensions

  • Diameter: 0.875"
See all available dimensions for this product
  • 12″ (1 ft.) - $53.26 ea.
  • 24″ (2 ft.) - $103.60 ea.
  • 36″ (3 ft.) - $141.42 ea.
  • 48″ (4 ft.) - $176.33 ea.
  • 72″ (6 ft.) - $249.04 ea.
  • 96″ (8 ft.) - $310.18 ea.
  • 144″ (12 ft.) - $386.12 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

$53.26 ea.
$53.26 for 1

7/8" Alloy Steel Round Bar 4340-Annealed Cold Finish - 
Part #: 25264

7/8" Alloy Steel Round Bar 4340-Annealed Cold Finish -
Part #: 25264

Click for more details

alloy-steel-round-bar-4340-normalized-cold-finished-turned-1superZoom

Dimensions

  • Diameter: 0.875"
See all available dimensions for this product
  • 12″ (1 ft.) - $51.97 ea.
  • 24″ (2 ft.) - $101.14 ea.
  • 36″ (3 ft.) - $138.03 ea.
  • 48″ (4 ft.) - $172.10 ea.
  • 72″ (6 ft.) - $243.09 ea.
  • 96″ (8 ft.) - $302.74 ea.
  • 144″ (12 ft.) - $376.88 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

$51.97 ea.
$51.97 for 1

1" Alloy Steel Round Bar 4340-Normalized Cold Finish - 
Part #: 7391

1" Alloy Steel Round Bar 4340-Normalized Cold Finish -
Part #: 7391

Click for more details

alloy-steel-round-bar-4340-normalized-cold-finished-turned-1superZoom

Dimensions

  • Diameter: 1"
See all available dimensions for this product
  • 12″ (1 ft.) - $48.17 ea.
  • 24″ (2 ft.) - $93.71 ea.
  • 36″ (3 ft.) - $127.91 ea.
  • 48″ (4 ft.) - $159.49 ea.
  • 72″ (6 ft.) - $225.26 ea.
  • 96″ (8 ft.) - $280.56 ea.
  • 144″ (12 ft.) - $349.24 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

$48.17 ea.
$48.17 for 1

1" Alloy Steel Round Bar 4340-Annealed Hot Rolled - 
Part #: 25265

1" Alloy Steel Round Bar 4340-Annealed Hot Rolled -
Part #: 25265

Click for more details

alloy-steel-round-bar-4340-normalized-rough-turned-1superZoom

Dimensions

  • Diameter: 1"
See all available dimensions for this product
  • 12″ (1 ft.) - $30.63 ea.
  • 24″ (2 ft.) - $59.60 ea.
  • 36″ (3 ft.) - $81.35 ea.
  • 48″ (4 ft.) - $101.42 ea.
  • 72″ (6 ft.) - $143.26 ea.
  • 96″ (8 ft.) - $178.42 ea.
  • 144″ (12 ft.) - $222.12 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

$30.63 ea.
$30.63 for 1
  • 1
  • 3
  • 4

Can't find what you're looking for?

Contact us for a custom quote