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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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0.25" X 12" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002532

0.25" X 12" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002532

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Dimensions

  • Thickness: 0.25"
  • Width: 12"
See all available dimensions for this product
  • 12″ (1 ft.) - $120.31 ea.
  • 24″ (2 ft.) - $240.62 ea.
  • 36″ (3 ft.) - $360.93 ea.
  • 48″ (4 ft.) - $481.24 ea.
  • 60″ (5 ft.) - $601.55 ea.
  • 72″ (6 ft.) - $721.86 ea.
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$120.31 ea.
$120.31 for 1
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Savings
2-4
$116.70
3%
5-9
$114.29
5%
10+
$108.28
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0.25" X 8" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002555

0.25" X 8" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002555

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Dimensions

  • Thickness: 0.25"
  • Width: 8"
See all available dimensions for this product
  • 12″ (1 ft.) - $80.59 ea.
  • 24″ (2 ft.) - $161.17 ea.
  • 36″ (3 ft.) - $241.76 ea.
  • 48″ (4 ft.) - $322.34 ea.
  • 60″ (5 ft.) - $402.93 ea.
  • 72″ (6 ft.) - $483.51 ea.
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$80.59 ea.
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$78.17
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5-9
$76.56
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10+
$72.53
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0.25" X 1.5" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002591

0.25" X 1.5" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002591

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Dimensions

  • Thickness: 0.25"
  • Width: 1.5"
See all available dimensions for this product
  • 12″ (1 ft.) - $14.76 ea.
  • 24″ (2 ft.) - $29.51 ea.
  • 36″ (3 ft.) - $44.27 ea.
  • 48″ (4 ft.) - $59.02 ea.
  • 60″ (5 ft.) - $73.78 ea.
  • 72″ (6 ft.) - $88.53 ea.
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$14.76 ea.
$14.76 for 1
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$14.32
2%
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$14.02
5%
10+
$13.28
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0.25" X 4" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002626

0.25" X 4" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002626

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Dimensions

  • Thickness: 0.25"
  • Width: 4"
See all available dimensions for this product
  • 12″ (1 ft.) - $39.73 ea.
  • 24″ (2 ft.) - $79.45 ea.
  • 36″ (3 ft.) - $119.18 ea.
  • 48″ (4 ft.) - $158.90 ea.
  • 60″ (5 ft.) - $198.63 ea.
  • 72″ (6 ft.) - $238.35 ea.
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$39.73 ea.
$39.73 for 1
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$38.54
2%
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$37.74
5%
10+
$35.76
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0.25" X 2" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002633

0.25" X 2" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002633

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Dimensions

  • Thickness: 0.25"
  • Width: 2"
See all available dimensions for this product
  • 12″ (1 ft.) - $20.43 ea.
  • 24″ (2 ft.) - $40.86 ea.
  • 36″ (3 ft.) - $61.29 ea.
  • 48″ (4 ft.) - $81.72 ea.
  • 60″ (5 ft.) - $102.15 ea.
  • 72″ (6 ft.) - $122.58 ea.
Create Custom Cut

QTY

$20.43 ea.
$20.43 for 1
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Qty
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Savings
2-4
$19.82
2%
5-9
$19.41
4%
10+
$18.39
9%
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0.25" X 6" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002636

0.25" X 6" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002636

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Dimensions

  • Thickness: 0.25"
  • Width: 6"
See all available dimensions for this product
  • 12″ (1 ft.) - $60.16 ea.
  • 24″ (2 ft.) - $120.31 ea.
  • 36″ (3 ft.) - $180.47 ea.
  • 48″ (4 ft.) - $240.62 ea.
  • 60″ (5 ft.) - $300.78 ea.
  • 72″ (6 ft.) - $360.93 ea.
Create Custom Cut

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$60.16 ea.
$60.16 for 1
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Savings
2-4
$58.36
2%
5-9
$57.15
5%
10+
$54.14
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0.25" X 3" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002662

0.25" X 3" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002662

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Dimensions

  • Thickness: 0.25"
  • Width: 3"
See all available dimensions for this product
  • 12″ (1 ft.) - $30.65 ea.
  • 24″ (2 ft.) - $61.29 ea.
  • 36″ (3 ft.) - $91.94 ea.
  • 48″ (4 ft.) - $122.58 ea.
  • 60″ (5 ft.) - $153.23 ea.
  • 72″ (6 ft.) - $183.87 ea.
Create Custom Cut

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$30.65 ea.
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2-4
$29.73
3%
5-9
$29.12
4%
10+
$27.59
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0.25" X 10" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002667

0.25" X 10" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002667

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Dimensions

  • Thickness: 0.25"
  • Width: 10"
See all available dimensions for this product
  • 12″ (1 ft.) - $101.02 ea.
  • 24″ (2 ft.) - $202.03 ea.
  • 36″ (3 ft.) - $303.05 ea.
  • 48″ (4 ft.) - $404.06 ea.
  • 60″ (5 ft.) - $505.08 ea.
  • 72″ (6 ft.) - $606.09 ea.
Create Custom Cut

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$101.02 ea.
$101.02 for 1
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Savings
2-4
$97.99
2%
5-9
$95.97
4%
10+
$90.92
9%
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0.25" X 1" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002669

0.25" X 1" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002669

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Dimensions

  • Thickness: 0.25"
  • Width: 1"
See all available dimensions for this product
  • 12″ (1 ft.) - $10.22 ea.
  • 24″ (2 ft.) - $20.43 ea.
  • 36″ (3 ft.) - $30.65 ea.
  • 48″ (4 ft.) - $40.86 ea.
  • 60″ (5 ft.) - $51.08 ea.
  • 72″ (6 ft.) - $61.29 ea.
Create Custom Cut

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$10.22 ea.
$10.22 for 1
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Savings
2-4
$9.91
3%
5-9
$9.71
4%
10+
$9.20
9%
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0.375" x 1" Alloy Steel Rectangle Bar 4140 - 
Part #: 28042

0.375" 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.

0.375" Alloy Steel Round Bar 4140 Cold Finished Heat Treated - 
Part #: mp-00002485

0.375" Alloy Steel Round Bar 4140 Cold Finished Heat Treated -
Part #: mp-00002485

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Dimensions

  • Diameter: 0.375"
See all available dimensions for this product
  • 12″ (1 ft.) - $4.88 ea.
  • 24″ (2 ft.) - $9.75 ea.
  • 36″ (3 ft.) - $14.63 ea.
  • 48″ (4 ft.) - $19.51 ea.
  • 72″ (6 ft.) - $29.26 ea.
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$4.88 ea.
$4.88 for 1
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Savings
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$4.73
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5-9
$4.64
4%
10+
$4.39
10%
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0.375" X 12" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002573

0.375" X 12" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002573

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Dimensions

  • Thickness: 0.375"
  • Width: 12"
See all available dimensions for this product
  • 12″ (1 ft.) - $152.96 ea.
  • 24″ (2 ft.) - $305.92 ea.
  • 36″ (3 ft.) - $458.87 ea.
  • 48″ (4 ft.) - $611.83 ea.
  • 60″ (5 ft.) - $764.79 ea.
  • 72″ (6 ft.) - $917.75 ea.
Create Custom Cut

QTY

$152.96 ea.
$152.96 for 1
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Price ea.
Savings
2-4
$148.37
3%
5-9
$145.31
5%
10+
$137.66
10%
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0.375" X 1.5" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002576

0.375" X 1.5" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002576

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Dimensions

  • Thickness: 0.375"
  • Width: 1.5"
See all available dimensions for this product
  • 12″ (1 ft.) - $19.24 ea.
  • 24″ (2 ft.) - $38.48 ea.
  • 36″ (3 ft.) - $57.72 ea.
  • 48″ (4 ft.) - $76.96 ea.
  • 60″ (5 ft.) - $96.20 ea.
  • 72″ (6 ft.) - $115.44 ea.
Create Custom Cut

QTY

$19.24 ea.
$19.24 for 1
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Qty
Price ea.
Savings
2-4
$18.66
3%
5-9
$18.28
4%
10+
$17.32
9%
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0.375" X 8" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002601

0.375" X 8" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002601

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Dimensions

  • Thickness: 0.375"
  • Width: 8"
See all available dimensions for this product
  • 12″ (1 ft.) - $101.97 ea.
  • 24″ (2 ft.) - $203.94 ea.
  • 36″ (3 ft.) - $305.92 ea.
  • 48″ (4 ft.) - $407.89 ea.
  • 60″ (5 ft.) - $509.86 ea.
  • 72″ (6 ft.) - $611.83 ea.
Create Custom Cut

QTY

$101.97 ea.
$101.97 for 1
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Savings
2-4
$98.91
3%
5-9
$96.87
5%
10+
$91.77
10%
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0.375" X 6" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002614

0.375" X 6" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002614

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Dimensions

  • Thickness: 0.375"
  • Width: 6"
See all available dimensions for this product
  • 12″ (1 ft.) - $76.96 ea.
  • 24″ (2 ft.) - $153.92 ea.
  • 36″ (3 ft.) - $230.88 ea.
  • 48″ (4 ft.) - $307.84 ea.
  • 60″ (5 ft.) - $384.80 ea.
  • 72″ (6 ft.) - $461.76 ea.
Create Custom Cut

QTY

$76.96 ea.
$76.96 for 1
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Savings
2-4
$74.65
3%
5-9
$73.11
5%
10+
$69.26
10%
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0.375" X 3" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002622

0.375" X 3" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002622

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Dimensions

  • Thickness: 0.375"
  • Width: 3"
See all available dimensions for this product
  • 12″ (1 ft.) - $38.48 ea.
  • 24″ (2 ft.) - $76.96 ea.
  • 36″ (3 ft.) - $115.44 ea.
  • 48″ (4 ft.) - $153.92 ea.
  • 60″ (5 ft.) - $192.40 ea.
  • 72″ (6 ft.) - $230.88 ea.
Create Custom Cut

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$38.48 ea.
$38.48 for 1
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Savings
2-4
$37.33
2%
5-9
$36.56
4%
10+
$34.63
10%
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0.375" X 2" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002620

0.375" X 2" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002620

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Dimensions

  • Thickness: 0.375"
  • Width: 2"
See all available dimensions for this product
  • 12″ (1 ft.) - $25.97 ea.
  • 24″ (2 ft.) - $51.95 ea.
  • 36″ (3 ft.) - $77.92 ea.
  • 48″ (4 ft.) - $103.90 ea.
  • 60″ (5 ft.) - $129.87 ea.
  • 72″ (6 ft.) - $155.84 ea.
Create Custom Cut

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$25.97 ea.
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Savings
2-4
$25.19
3%
5-9
$24.67
5%
10+
$23.37
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0.375" X 1" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002653

0.375" X 1" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002653

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Dimensions

  • Thickness: 0.375"
  • Width: 1"
See all available dimensions for this product
  • 12″ (1 ft.) - $12.51 ea.
  • 24″ (2 ft.) - $25.01 ea.
  • 36″ (3 ft.) - $37.52 ea.
  • 48″ (4 ft.) - $50.02 ea.
  • 60″ (5 ft.) - $62.53 ea.
  • 72″ (6 ft.) - $75.04 ea.
Create Custom Cut

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$12.51 ea.
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Savings
2-4
$12.13
3%
5-9
$11.88
5%
10+
$11.26
9%
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0.375" X 4" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002644

0.375" X 4" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002644

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Dimensions

  • Thickness: 0.375"
  • Width: 4"
See all available dimensions for this product
  • 12″ (1 ft.) - $50.99 ea.
  • 24″ (2 ft.) - $101.97 ea.
  • 36″ (3 ft.) - $152.96 ea.
  • 48″ (4 ft.) - $203.94 ea.
  • 60″ (5 ft.) - $254.93 ea.
  • 72″ (6 ft.) - $305.92 ea.
Create Custom Cut

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$50.99 ea.
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Savings
2-4
$49.46
3%
5-9
$48.44
5%
10+
$45.89
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0.5" Alloy Steel Round Bar 4140-Annealed Cold Finish - 
Part #: 15484

0.5" Alloy Steel Round Bar 4140-Annealed Cold Finish -
Part #: 15484

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

Dimensions

  • Diameter: 0.5"
See all available dimensions for this product
  • 12″ (1 ft.) - $12.74 ea.
  • 24″ (2 ft.) - $24.83 ea.
  • 36″ (3 ft.) - $33.87 ea.

    Bundle and Save!

  • 44″ (44 in.) - $38.91 ea.

    Order to avoid UPS additional handling fees

  • 48″ (4 ft.) - $42.22 ea.
  • 72″ (6 ft.) - $59.65 ea.
  • 96″ (8 ft.) - $74.28 ea.
  • 144″ (12 ft.) - $92.46 ea.
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$12.74 ea.
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0.500" Alloy Steel Round Bar 4140 Cold Finished Heat Treated - 
Part #: mp-00002423

0.500" Alloy Steel Round Bar 4140 Cold Finished Heat Treated -
Part #: mp-00002423

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Dimensions

  • Diameter: 0.5"
See all available dimensions for this product
  • 12″ (1 ft.) - $8.34 ea.
  • 24″ (2 ft.) - $16.67 ea.
  • 36″ (3 ft.) - $25.01 ea.
  • 48″ (4 ft.) - $33.35 ea.
  • 72″ (6 ft.) - $50.02 ea.
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$8.34 ea.
$8.34 for 1
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Savings
2-4
$8.09
2%
5-9
$7.92
5%
10+
$7.51
9%
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0.5" X 8" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002551

0.5" X 8" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002551

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Dimensions

  • Thickness: 0.5"
  • Width: 8"
See all available dimensions for this product
  • 12″ (1 ft.) - $110.05 ea.
  • 24″ (2 ft.) - $220.10 ea.
  • 36″ (3 ft.) - $330.15 ea.
  • 48″ (4 ft.) - $440.20 ea.
  • 60″ (5 ft.) - $550.25 ea.
  • 72″ (6 ft.) - $660.30 ea.
Create Custom Cut

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$110.05 ea.
$110.05 for 1
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Savings
2-4
$106.75
2%
5-9
$104.55
4%
10+
$99.05
9%
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0.5" X 4" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002580

0.5" X 4" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002580

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Dimensions

  • Thickness: 0.5"
  • Width: 4"
See all available dimensions for this product
  • 12″ (1 ft.) - $55.03 ea.
  • 24″ (2 ft.) - $110.05 ea.
  • 36″ (3 ft.) - $165.08 ea.
  • 48″ (4 ft.) - $220.10 ea.
  • 60″ (5 ft.) - $275.13 ea.
  • 72″ (6 ft.) - $330.15 ea.
Create Custom Cut

QTY

$55.03 ea.
$55.03 for 1
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Qty
Price ea.
Savings
2-4
$53.38
2%
5-9
$52.28
4%
10+
$49.53
9%
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0.5" X 3" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002575

0.5" X 3" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002575

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Dimensions

  • Thickness: 0.5"
  • Width: 3"
See all available dimensions for this product
  • 12″ (1 ft.) - $41.08 ea.
  • 24″ (2 ft.) - $82.15 ea.
  • 36″ (3 ft.) - $123.23 ea.
  • 48″ (4 ft.) - $164.30 ea.
  • 60″ (5 ft.) - $205.38 ea.
  • 72″ (6 ft.) - $246.45 ea.
Create Custom Cut

QTY

$41.08 ea.
$41.08 for 1
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Qty
Price ea.
Savings
2-4
$39.85
2%
5-9
$39.03
4%
10+
$36.97
10%
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0.5" X 12" Alloy Steel Rectangle Bar 4140 Heat Treated - 
Part #: mp-00002594

0.5" X 12" Alloy Steel Rectangle Bar 4140 Heat Treated -
Part #: mp-00002594

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Dimensions

  • Thickness: 0.5"
  • Width: 12"
See all available dimensions for this product
  • 12″ (1 ft.) - $164.30 ea.
  • 24″ (2 ft.) - $328.60 ea.
  • 36″ (3 ft.) - $492.90 ea.
  • 48″ (4 ft.) - $657.20 ea.
  • 60″ (5 ft.) - $821.50 ea.
  • 72″ (6 ft.) - $985.80 ea.
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QTY

$164.30 ea.
$164.30 for 1
qty discount iconBuy More & Save up to 10% !
Qty
Price ea.
Savings
2-4
$159.37
3%
5-9
$156.09
4%
10+
$147.87
10%
More
Less
Sold and shipped by MSP Metals

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