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Alloy Steel Tolerances


​​​​​​​Round Bars | Square Bars | Hex Bars | Rectangle Bars | Sheet/Plate | Round Tubes


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Round Bars
Spec. Diameter, in. Diameter Tol.
Alloy Steel Round Bar 4130-Norm., 4140-Ann., 4340-Norm. Cold Finish  Up to 1.5, incl.  +/- 0.004"
Alloy Steel Round Bar 4130-Norm., 4140-Ann. Cold Finish  Over 1.5 to 2.5, incl.    +/- 0.005" 
Alloy Steel Round Bar 4130-Norm., 4140-Ann. Cold Finish  Over 2.5 to 4, incl.  +/- 0.006" 
Alloy Steel Round Bar 4130-Norm. Cold Finish  Over 4 to 6, incl.   +/- 0.007" 


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Round Bars
Spec. Diameter, in. Diameter Tol.
Alloy Steel Round Bar 8620 Cold Finish  Up to 1.5, incl.  +/- 0.003"
Alloy Steel Round Bar 8620 Cold Finish  Over 1.5 to 2.5, incl.    +/- 0.004"
Alloy Steel Round Bar 8620 Cold Finish  Over 2.5 to 4, incl.  +/- 0.005"


 
Round Bars
Spec. Diameter, in. Diameter Tol. 
Alloy Steel Round Bar 4340-Norm. Hot Rolled/ Rough Turned  Over 1 to 1.125, incl.  +/- 0.010"
Alloy Steel Round Bar 4340-Norm. Hot Rolled/ Rough Turned  Over 1.125 to 1.25, incl.  +/- 0.011" 
Alloy Steel Round Bar 4340-Norm. Hot Rolled/ Rough Turned  Over 1.25 to 1.375, incl.  +/- 0.012" 
Alloy Steel Round Bar 4340-Norm. Hot Rolled/ Rough Turned  Over 1.375 to 1.5, incl.  +/- 0.014" 
Alloy Steel Round Bar 4340-Norm., 8620 Hot Rolled/ Rough Turned  Over 1.5 to 2, incl.  +/- 1/64" 
Alloy Steel Round Bar 4340-Norm., 8620 Hot Rolled/ Rough Turned  Over 2 to 2.5, incl.  + 1/32" 
Alloy Steel Round Bar 4340-Norm., 8620 Hot Rolled/ Rough Turned  Over 2.5 to 3.5, incl.  + 3/64" 
Alloy Steel Round Bar 4340-Norm., 8620 Hot Rolled/ Rough Turned  Over 3.5 to 4.5, incl.  + 1/16" 
Alloy Steel Round Bar 4340-Norm., 8620 Hot Rolled/ Rough Turned  Over 4.5 to 5.5, incl.  + 5/64" 
Alloy Steel Round Bar 4340-Norm., 8620 Hot Rolled/ Rough Turned  Over 5.5 to 6.5, incl.  + 1/8" 
Alloy Steel Round Bar 4340-Norm. Hot Rolled/ Rough Turned  Over 6.5 to 8.25, incl.  + 5/32"
Alloy Steel Round Bar 4340-Norm. Hot Rolled/ Rough Turned  Over 8.25 to 9.5, incl.  + 3/16" 


 
Round Bars
Spec. Diameter, in. Diameter Tol.
Alloy Steel  Round Bar 4330, 4340, 9310 VAR  Up to 0.3125  +/- 0.005"
Alloy Steel  Round Bar 4330, 4340, 9310 VAR  Over 0.3125 to 0.4375, incl.  +/- 0.006"
Alloy Steel  Round Bar 4330, 4340, 9310 VAR  Over 0.4375 to 0.625, incl.  +/- 0.007"
Alloy Steel  Round Bar 4330, 4340, 9310 VAR  Over 0.625 to 0.875, incl.  +/- 0.008"
Alloy Steel  Round Bar 4330, 4340, 9310 VAR  Over 0.875 to 1.000, incl.  +/- 0.009"
Alloy Steel  Round Bar 4330, 4340, 9310 VAR  Over 1.000 to 1.125, incl.  +/- 0.010"
Alloy Steel  Round Bar 4330, 4340, 9310 VAR  Over 1.125 to 1.250, incl.  +/- 0.011"
Alloy Steel  Round Bar 4330, 4340, 9310 VAR  Over 1.250 to 1.375, incl.  +/- 0.012"
Alloy Steel  Round Bar 4330, 4340, 9310 VAR  Over 1.375 to 1.500, incl.  +/- 0.014"
Alloy Steel  Round Bar 4330, 4340, 9310 VAR  Over 1.500 to 2.000, incl.  +/- 0.016"
Alloy Steel  Round Bar 4330, 4340, 9310 VAR  Over 2.000 to 2.500, incl.  + 0.031"
Alloy Steel  Round Bar 4330, 4340, 9310 VAR  Over 2.500 to 3.500, incl.   + 0.047"
Alloy Steel  Round Bar 4330, 4340, 9310 VAR  Over 3.500 to 4.500, incl.  + 0.063"
Alloy Steel  Round Bar 4330, 4340, 9310 VAR  Over 4.500 to 5.500, incl.  + 0.078"
Alloy Steel  Round Bar 4330, 4340, 9310 VAR  Over 5.500 to 6.500, incl.  + 0.125"
Alloy Steel  Round Bar 4330, 4340, 9310 VAR  Over 6.500 to 8.250, incl.  + 0.156"
Alloy Steel  Round Bar 4330, 4340, 9310 VAR  Over 8.250 to 9.500, incl.  + 0.188"
Alloy Steel  Round Bar 4330, 4340, 9310 VAR  Over 9.500 ot 10.000, incl.  + 0.250"


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       Metric Round Bars
Spec. Dia., mm Dia. Tol.
Alloy Steel Round Bar 4140 metric Ann. TGP 6mm to 42mm 0/-.0005″ (.0127mm)
Alloy Steel Round Bar 4140 metric Ann. TGP 45mm to 60mm 0/-.00075″ (.0191mm)

 

Square Bars        
 Spec. Sq., in.  Sq. Tol.  Spec. Length Length Tol.

Alloy

Steel

Sq. Bar 4142 Pre- hard All Sizes  +/- 0.001"  18"  + 0.125" to 0.25"

Alloy

Steel

Sq. Bar 4142 Pre- hard All Sizes  +/- 0.001"  36"  + 0.25" to 0.50"

Alloy

Steel

Sq. Bar 4142 Pre- hard All Sizes  +/- 0.001"  72"  + 1.00", - 0"

 

Hex Bars         
Spec. Across Flats Across Flats Tol.
Alloy Steel Hex Bar 4140/4142 Cold Finish  Up to 0.75, incl.  +/- 0.004"
Alloy Steel Hex Bar 4140/4142 Cold Finish  Over 0.75 to 1.5, incl.   +/- 0.005" 
Alloy Steel Hex Bar 4140/4142 Cold Finish  Over 1.5 to 2.5, incl.   +/- 0.006" 
Alloy Steel Hex Bar 4140/4142 Cold Finish  Over 2.5 to 3.125, incl.   +/- 0.007" 


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Hex Bars 
 Spec. Across Flats  Across Flats Tol.
Alloy Steel Hex Bar 4140 metric Quench Tempered/ Stress Relieved   > 3mm to ≤ 6mm  0/-.075mm
Alloy Steel Hex Bar 4140 metric QT/SR  > 6mm to ≤ 10mm  0/-.090mm
Alloy Steel Hex Bar 4140 metric QT/SR  > 10mm to ≤ 18mm  0/-.110mm
Alloy Steel Hex Bar 4140 metric QT/SR  > 18mm to ≤ 30mm  0/-.130mm
Alloy Steel Hex Bar 4140 metric QT/SR  > 30mm to ≤ 50mm  0/-.160mm

 

Rectangle Bars
 Spec. Thick, in.  Thick Tol.  Spec. Width, in.  Width Tol.
 Alloy Steel  Rect. Bar  4142  pre- hard  Any  +/- 0.001"   Any  + 0.000" to + 0.005" 

 

Sheet/Plate
Spec. Thick, in.  Thick Tol.
Alloy Steel Sheet 4130 Annealed/ Normalized Cold Rolled   0.025  +/- 0.005"
Alloy Steel Sheet 4130 Annealed/ Normalized Cold Rolled   0.032  +/- 0.005"
Alloy Steel Sheet 4130 Annealed/ Normalized Cold Rolled   0.040  +/- 0.009"
Alloy Steel Sheet 4130 Annealed/ Normalized Cold Rolled   0.050  +/- 0.009"
Alloy Steel Sheet 4130 Annealed/ Normalized Cold Rolled   0.063  +/- 0.009"
Alloy Steel Sheet 4130 Annealed/ Normalized Cold Rolled   0.071  +/- 0.009"
Alloy Steel Sheet 4130 Annealed/ Normalized Cold Rolled   0.080  +/- 0.009"
Alloy Steel Sheet 4130 Annealed/ Normalized Cold Rolled   0.090  +/- 0.009"
Alloy Steel Sheet 4130 Annealed/ Normalized Cold Rolled   0.100  +/- 0.009"
Alloy Steel Sheet 4130 Annealed/ Normalized Cold Rolled   0.125  +/- 0.009"
Alloy Steel Sheet 4130 Annealed/ Normalized Cold Rolled   0.160  +/- 0.009"
Alloy Steel Sheet 4130 Annealed/ Normalized Hot Rolled   0.190  +/- 0.009"


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Sheet/Plate
Spec. Thick, in.  Thick Tol.
Alloy Steel Plate 4340 Annealed Hot Rolled   Up to 0.5, excl.  +0.03", -0.01"
Alloy Steel Plate 4340 Annealed Hot Rolled   0.5 to 0.625, excl.  +0.03", -0.01"
Alloy Steel Plate 4340 Annealed Hot Rolled   0.625 to 0.75, excl.  +0.03", -0.01"
Alloy Steel Plate 4340 Annealed Hot Rolled   0.75 to 1, excl.  +0.03", -0.01"
Alloy Steel Plate 4340 Annealed Hot Rolled   1 to 2, excl.  +0.06", -0.01"
Alloy Steel Plate 4340 Annealed Hot Rolled   2 to 3, excl.  +0.09", -0.01"
Alloy Steel Plate 4340 Annealed Hot Rolled   3 to 4, excl.  +0.11", -0.01"
Alloy Steel Plate 4340 Annealed Hot Rolled   4 to 6, excl.  +0.15", -0.01"
Alloy Steel Plate 4340 Annealed Hot Rolled   6 to 10, excl.  +0.24", -0.01"

 

Round Tubes         
Spec. O.D., in. O.D. Tol.
Alloy Steel Round Tube 4130-N Cold Drawn/ Seamless  Up to 0.499 + 0.005", - 0.002"
Alloy Steel Round Tube 4130-N Cold Drawn/ Seamless  0.500 to 1.699 + 0.007", - 0.002"
Alloy Steel Round Tube 4130-N Cold Drawn/ Seamless  1.700 to 2.099 + 0.006", - 0.005"
Alloy Steel Round Tube 4130-N Cold Drawn/ Seamless  2.100 to 2.499 + 0.008", - 0.005"
Alloy Steel Round Tube 4130-N Cold Drawn/ Seamless  2.500 to 2.899 + 0.009", - 0.005"
Alloy Steel Round Tube 4130-N Cold Drawn/ Seamless  2.900 to 3.299 + 0.011", - 0.005"
Alloy Steel Round Tube 4130-N Cold Drawn/ Seamless  3.300 to 3.699 + 0.013", - 0.005"
Alloy Steel Round Tube 4130-N Cold Drawn/ Seamless  3.700 to 4.099 + 0.013", - 0.007"
Alloy Steel Round Tube 4130-N Cold Drawn/ Seamless  4.100 to 4.499 + 0.014", - 0.007"
Alloy Steel Round Tube 4130-N Cold Drawn/ Seamless  4.500 to 4.899 + 0.016", - 0.007"
Alloy Steel Round Tube 4130-N Cold Drawn/ Seamless  4.900 to 5.299 + 0.018", - 0.007"
Alloy Steel Round Tube 4130-N Cold Drawn/ Seamless  5.300 to 5.549 + 0.020", - 0.007"


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Round Tubes
  Wall Tolerance
Wall Thick % of OD Spec. I.D. Under 0.500" Spec. I.D 0.500" and Over
Alloy Steel Round Tube 4130-N Cold Drawn/ smls.  Under 10%  +/- 10%  +/- 7.5% 
Alloy Steel Round Tube 4130-N Cold Drawn/ smls.  10 to 25%  +/- 10%  +/- 6.0%
Alloy Steel Round Tube 4130-N Cold Drawn/ smls.  Over 25%  +/- 12.5%  +/- 7.5%