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Ground Flat Stock - Manufacturer Tolerances
The following Manufacturer-Tolerance Table shows the tolerances of Ground Flat Stock (GFS) provided by the leading North American manufacturers. To use this table, find a product in the left column. Read the tolerance specification for each manufacturer in the other columns of the same row. An empty cell indicates that the manufacturer does not offer the product.
| Product | Precision Marshall | DB&S Steel | Starrett | Precision Brand |
| Regular Tol. (Inch) Tool Steel |
Thickness: ±.001″ Width: .000/+.005″ Squares: ±.001″ Length (18″): +.125/.250″ Length (24″): .1875/.375″ Length (36″): +.250/.500″ |
Thickness (up to 1.25″): ±.001″ Thickness (over 1.25″): ±.002″ Width: .000/+.005″ Squares (up to 1.25″): ±.001″ Squares (over 1.25″): ±.002″ Length: .000/+.125″ |
Thickness: ±.001″ Width (up to 8″): .000/+.005″ Width (over 8″): .000/+.015″ Squares: +/-.001″ Length (18″): .000/+.250 Length (24″): .000/+.500 Length (36″): .000/+.625 |
Thickness: ±.001″ Width: .000/+.005″ Squares: ±.001″ |
| Regular Tol. (Metric) Tool Steel |
Thickness: .00/+.05mm Width: .0/+.2mm Squares: .00/+.05mm Length: +5mm/+8mm |
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| Regular (Inch) Pre-hardened |
Thickness (L<72″): +/-.001″ Thickness (L=72″): +/-.002″ Width: .000/+.005″ Length (18″): +.125/.250″ Length (36″): +.250/.500″ Length (72″): .00/+1.00″ |
Thickness (up to 1.25″): ±.001″ Thickness (over 1.25″): ±.002″ Width: .000/+.005″ Squares (up to 1.25″): ±.001″ Squares (over 1.25″): ±.002″ Length: .000/+.125″ |
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| Regular Tol.Low Carbon (Inch) |
Thickness: +/-.001″ Width: .000/+.005″ Length (24″): 188/.375″ |
Thickness (up to 1.25″): ±.001″ Thickness (over 1.25″): ±.002″ Width: .000/+.005″ Squares (up to 1.25″): ±.001″ Squares (over 1.25″): ±.002″ Length: .000/+.125″ |
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| Regular Tol. (Inch) Stainless |
Thickness: ±.001″ Width: .000/+.005″ Length: .00/+.50″ |
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| Oversize Tol. (Inch) |
Thickness: +.010/+.015″ Width: +.010/+.015″ Length (18″): +.125/.250″ Length (36″): +.250/.500″ |
Thickness: +.010/+.015″ Width: +.010/+.015″ Length: +.000/+.125″ |
Thickness: +.010/+.015″ Width: +.010/+.015″ Length (18″): .000/+.250 Length (24″): .000/+.500 Length (36″): .000/+.625 |
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| Squareness (Inch) |
Edge: .003″ / Inch End: .004″ / Inch |
Edge: .003″ / Inch | ||
| Squareness (Metric) |
Edge: .075mm / 25mm End: .100mm / 25mm |
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| Cold Drawn | Thickness (< .249″): ±.0005″ Width (< .249″): ±.0005″ Thickness (.250-.749″): ±.001″ Width (.250-.749″): ±.001″ Thickness (> 750″): ±.0015″ Width (> 750″): ±.0015″ Length: .000/+.125″ |
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| Finish | 35 Microinch Maximum | 35 Microinch Maximum |