Alloy Steel Tolerances
Round Bars | Square Bars | Hex Bars | Rectangle Bars | Sheet/Plate | Round Tubes
Round Bar | |||
Alloy(s) | Spec. Diameter, in. | Diameter Tol. (over(+)/under(-)) | |
4130-Norm., 4140-Ann., 4340-Norm. | Cold Finish | Up to 1.5, incl. | +/- 0.004" |
4130-Norm., 4140-Ann. | Cold Finish | Over 1.5 to 2.5, incl. | +/- 0.005" |
4130-Norm., 4140-Ann. | Cold Finish | Over 2.5 to 4, incl. | +/- 0.006" |
4130-Norm. | Cold Finish | Over 4 to 6, incl. | +/- 0.007" |
Round Bar | |||
Alloy(s) | Spec. Diameter, in. | Diameter Tol. (over(+)/under(-)) | |
8620 | Cold Finish | Up to 1.5, incl. | +/- 0.003" |
8620 | Cold Finish | Over 1.5 to 2.5, incl. | +/- 0.004" |
8620 | Cold Finish | Over 2.5 to 4, incl. | +/- 0.005" |
Round Bar | |||
Alloy(s) | Spec. Diameter, in. | Diameter Tol. (over(+)/under(-)) | |
4340-Norm. | Hot Rolled/ Rough Turned | Over 1 to 1.125, incl. | +/- 0.010" |
4340-Norm. | Hot Rolled/ Rough Turned | Over 1.125 to 1.25, incl. | +/- 0.011" |
4340-Norm. | Hot Rolled/ Rough Turned | Over 1.25 to 1.375, incl. | +/- 0.012" |
4340-Norm. | Hot Rolled/ Rough Turned | Over 1.375 to 1.5, incl. | +/- 0.014" |
4340-Norm., 8620 | Hot Rolled/ Rough Turned | Over 1.5 to 2, incl. | +/- 0.015625" |
4340-Norm., 8620 | Hot Rolled/ Rough Turned | Over 2 to 2.5, incl. | + 0.03125" |
4340-Norm., 8620 | Hot Rolled/ Rough Turned | Over 2.5 to 3.5, incl. | + 0.046875" |
4340-Norm., 8620 | Hot Rolled/ Rough Turned | Over 3.5 to 4.5, incl. | + 0.0625" |
4340-Norm., 8620 | Hot Rolled/ Rough Turned | Over 4.5 to 5.5, incl. | + 0.078125" |
4340-Norm., 8620 | Hot Rolled/ Rough Turned | Over 5.5 to 6.5, incl. | + 0.125" |
4340-Norm. | Hot Rolled/ Rough Turned | Over 6.5 to 8.25, incl. | + 0.15625" |
4340-Norm. | Hot Rolled/ Rough Turned | Over 8.25 to 9.5, incl. | + 0.1875" |
Round Bar | |||
Alloy(s) | Spec. Diameter, in. | Diameter Tol. (over(+)/under(-)) | |
4330, 4340, 9310 | VAR | Up to 0.3125 | +/- 0.005" |
4330, 4340, 9310 | VAR | Over 0.3125 to 0.4375, incl. | +/- 0.006" |
4330, 4340, 9310 | VAR | Over 0.4375 to 0.625, incl. | +/- 0.007" |
4330, 4340, 9310 | VAR | Over 0.625 to 0.875, incl. | +/- 0.008" |
4330, 4340, 9310 | VAR | Over 0.875 to 1.000, incl. | +/- 0.009" |
4330, 4340, 9310 | VAR | Over 1.000 to 1.125, incl. | +/- 0.010" |
4330, 4340, 9310 | VAR | Over 1.125 to 1.250, incl. | +/- 0.011" |
4330, 4340, 9310 | VAR | Over 1.250 to 1.375, incl. | +/- 0.012" |
4330, 4340, 9310 | VAR | Over 1.375 to 1.500, incl. | +/- 0.014" |
4330, 4340, 9310 | VAR | Over 1.500 to 2.000, incl. | +/- 0.016" |
4330, 4340, 9310 | VAR | Over 2.000 to 2.500, incl. | + 0.031" |
4330, 4340, 9310 | VAR | Over 2.500 to 3.500, incl. | + 0.047" |
4330, 4340, 9310 | VAR | Over 3.500 to 4.500, incl. | + 0.063" |
4330, 4340, 9310 | VAR | Over 4.500 to 5.500, incl. | + 0.078" |
4330, 4340, 9310 | VAR | Over 5.500 to 6.500, incl. | + 0.125" |
4330, 4340, 9310 | VAR | Over 6.500 to 8.250, incl. | + 0.156" |
4330, 4340, 9310 | VAR | Over 8.250 to 9.500, incl. | + 0.188" |
4330, 4340, 9310 | VAR | Over 9.500 ot 10.000, incl. | + 0.250" |
Metric Round Bar | |||
Alloy(s) | Spec. Dia., mm | Dia. Tol. (over(+)/under(-)) | |
4140 metric | Ann. TGP | 6mm to 42mm | + 0/- 0.0005″ (.0127mm) |
4140 metric | Ann. TGP | 45mm to 60mm | + 0/- 0.00075″ (.0191mm) |
Square Bar | |||||
Alloy(s) | Spec. Sq., in. |
Sq. Tol. (over(+)/under(-)) | Spec. Length | Length Tol. (over(+)/under(-)) | |
4142 | Pre- hard | All Sizes | +/- 0.001" | 18" | + 0.125" to 0.25" |
4142 | Pre- hard | All Sizes | +/- 0.001" | 36" | + 0.25" to 0.50" |
4142 | Pre- hard | All Sizes | +/- 0.001" | 72" | + 1.00"/- 0" |
Hex Bar | |||
Alloy(s) | Spec. Across Flats | Across Flats Tol. (over(+)/under(-)) | |
4130 | Cold Drawn Normalized | Up to 0.500, incl. | +/- 0.007" |
4130 | Cold Drawn Normalized | Over 0.500 to 1.000, incl. | +/- 0.010" |
4130 | Cold Drawn Normalized | Over 1.000 to 1.500, incl. | + 0.021"/- 0.013" |
4130 | Cold Drawn Normalized | Over 1.500 to 2.000, incl. | + 0.03125"/- 0.015625" |
Hex Bar | |||
Alloy(s) | Spec. Across Flats | Across Flats Tol. (over(+)/under(-)) | |
4140/4142 | Cold Finish | Up to 0.750, incl. | +/- 0.004" |
4140/4142 | Cold Finish | Over 0.750 to 1.500, incl. | +/- 0.005" |
4140/4142 | Cold Finish | Over 1.500 to 2.500, incl. | +/- 0.006" |
4140/4142 | Cold Finish | Over 2.500 to 3.125, incl. | +/- 0.007" |
Metric Hex Bar | |||
Alloy(s) | Spec. Across Flats | Across Flats Tol. (over(+)/under(-)) | |
4140 metric | Quench Tempered/ Stress Relieved | > 3mm to ≤ 6mm | + 0/- 0.075mm |
4140 metric | QT/SR | > 6mm to ≤ 10mm | + 0/- 0.090mm |
4140 metric | QT/SR | > 10mm to ≤ 18mm | + 0/- 0.110mm |
4140 metric | QT/SR | > 18mm to ≤ 30mm | + 0/- 0.130mm |
4140 metric | QT/SR | > 30mm to ≤ 50mm | + 0/- 0.160mm |
Rectangle Bar | |||||
Alloy(s) | Spec. Thick, in. | Thick Tol. (over(+)/under(-)) | Spec. Width, in. | Width Tol. (over(+)/under(-)) | |
4142 | Pre-hard | Any | +/- 0.001" | Any | + 0.000" to + 0.005" |
Rectangle Bar | |||
Alloy(s) | Spec. Width, in. | Width & Thick Tol. (over(+)/under(-)) | |
4340 | Cold Drawn | Up to 0.75, incl. | +/- 0.004" |
4340 | Cold Drawn | Over 0.75 to 1.5, incl. | +/- 0.005" |
4340 | Cold Drawn | Over 1.5 to 3, incl. | +/- 0.006" |
4340 | Cold Drawn | Over 3 to 4, incl. | +/- 0.008" |
4340 | Cold Drawn | Over 4 to 6, incl. | +/- 0.010" |
Rectangle Bar | |||||||||
Permissible Variations in Thickness, for Thickness Given, in. (over(+)/under(-)) | |||||||||
Alloy(s) | Spec. Width, in. | 0.230 to 0.250, excl. | 0.250 to 0.500, incl. | Over 0.500 to 1, incl. | Over 1 to 2, incl. | Over 2 to 3, incl. | Over 3 | Width Tol. | |
4340 | Hot Rolled | Over 1 to 2, incl. | +/- 0.007" | +/- 0.008" | +/- 0.010" | ... | ... | ... | +/- 0.15625" |
4340 | Hot Rolled | Over 1 to 2, incl. | +/- 0.007" | +/- 0.012" | +/- 0.015" | +/- 0.03125" | ... | ... | +/- 0.03125" |
4340 | Hot Rolled | Over 2 to 4, incl. | +/- 0.008" | +/- 0.015" | +/- 0.020" | +/- 0.03125" | +/- 0.046875" | +/- 0.046875" | + 0.0625", - 0.03125" |
4340 | Hot Rolled | Over 4 to 6, incl. | +/ 0.009" | +/- 0.015" | +/- 0.020" | +/- 0.03125" | +/- 0.046875" | +/- 0.046875" | + 0.09375", - 0.0625" |
4340 | Hot Rolled | Over 6 to 8, incl. | +/- 0.015" | +/- 0.016" | +/- 0.025" | +/- 0.03125" | +/- 0.046875" | +/- 0.0625" | + 0.125", - 0.09375" |
Sheet/Plate | |||
Alloy(s) | Spec. Thick, in. | Thick Tol. (over(+)/under(-)) | |
4130 Annealed/ Normalized | Cold Rolled | 0.025 | +/- 0.005" |
4130 Annealed/ Normalized | Cold Rolled | 0.032 | +/- 0.005" |
4130 Annealed/ Normalized | Cold Rolled | 0.040 | +/- 0.009" |
4130 Annealed/ Normalized | Cold Rolled | 0.050 | +/- 0.009" |
4130 Annealed/ Normalized | Cold Rolled | 0.063 | +/- 0.009" |
4130 Annealed/ Normalized | Cold Rolled | 0.071 | +/- 0.009" |
4130 Annealed/ Normalized | Cold Rolled | 0.080 | +/- 0.009" |
4130 Annealed/ Normalized | Cold Rolled | 0.090 | +/- 0.009" |
4130 Annealed/ Normalized | Cold Rolled | 0.100 | +/- 0.009" |
4130 Annealed/ Normalized | Cold Rolled | 0.125 | +/- 0.009" |
4130 Annealed/ Normalized | Cold Rolled | 0.160 | +/- 0.009" |
4130 Annealed/ Normalized | Hot Rolled | 0.190 | +/- 0.009" |
Sheet/Plate | |||
Alloy(s) | Spec. Thick, in. | Thick Tol. (over(+)/under(-)) | |
4340 Annealed | Hot Rolled | Up to 0.5, excl. | + 0.03"/- 0.01" |
4340 Annealed | Hot Rolled | 0.5 to 0.625, excl. | + 0.03"/- 0.01" |
4340 Annealed | Hot Rolled | 0.625 to 0.75, excl. | + 0.03"/- 0.01" |
4340 Annealed | Hot Rolled | 0.75 to 1, excl. | + 0.03"/- 0.01" |
4340 Annealed | Hot Rolled | 1 to 2, excl. | + 0.06"/- 0.01" |
4340 Annealed | Hot Rolled | 2 to 3, excl. | + 0.09"/- 0.01" |
4340 Annealed | Hot Rolled | 3 to 4, excl. | + 0.11"/- 0.01" |
4340 Annealed | Hot Rolled | 4 to 6, excl. | + 0.15"/- 0.01" |
4340 Annealed | Hot Rolled | 6 to 10, excl. | + 0.24"/- 0.01" |
Round Tubes | |||
Alloy(s) | Spec. O.D., in. | O.D. Tol. (over(+)/under(-)) | |
4130-N | Cold Drawn/ Seamless | Up to 0.499 | + 0.005"/- 0.002" |
4130-N | Cold Drawn/ Seamless | 0.500 to 1.699 | + 0.007"/- 0.002" |
4130-N | Cold Drawn/ Seamless | 1.700 to 2.099 | + 0.006"/- 0.005" |
4130-N | Cold Drawn/ Seamless | 2.100 to 2.499 | + 0.008"/- 0.005" |
4130-N | Cold Drawn/ Seamless | 2.500 to 2.899 | + 0.009"/- 0.005" |
4130-N | Cold Drawn/ Seamless | 2.900 to 3.299 | + 0.011"/- 0.005" |
4130-N | Cold Drawn/ Seamless | 3.300 to 3.699 | + 0.013"/- 0.005" |
4130-N | Cold Drawn/ Seamless | 3.700 to 4.099 | + 0.013"/- 0.007" |
4130-N | Cold Drawn/ Seamless | 4.100 to 4.499 | + 0.014"/- 0.007" |
4130-N | Cold Drawn/ Seamless | 4.500 to 4.899 | + 0.016"/- 0.007" |
4130-N | Cold Drawn/ Seamless | 4.900 to 5.299 | + 0.018"/- 0.007" |
4130-N | Cold Drawn/ Seamless | 5.300 to 5.549 | + 0.020"/- 0.007" |
Round Tubes | ||||
Wall Tol. (over(+)/under(-)) | ||||
Alloy(s) | Wall Thick % of OD | Spec. I.D. Under 0.500" | Spec. I.D 0.500" and Over | |
4130-N | Cold Drawn / Smls. | Under 10% | +/- 10% | +/- 7.5% |
4130-N | Cold Drawn / Smls. | 10 to 25% | +/- 10% | +/- 6.0% |
4130-N | Cold Drawn / Smls. | Over 25% | +/- 12.5% | +/- 7.5% |
Metric Round Tubes | |||
Alloy(s) | Spec. O.D., mm | O.D. Tol. (over(+)/under(-)) | |
4140 Metric | Cold Drawn/ TGP | 8mm to 30mm | +/- 0.08mm |
4140 Metric | Cold Drawn/ TGP | 40mm | +/- 0.15mm |
Spec. Wall Thickness, mm | Wall Tol. (over(+)/under(-)) | ||
4140 Metric | Cold Drawn/ TGP | Any | +/- 10% or +/- 0.1mm (which ever value is greater) |