Key Metals Size Tolerances
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Alloy - Aluminum - Brass - Carbon - Stainless - Tool Steel - PGFS/Drill Rod - Hardened & Ground Round
Alloy Steel
Hot Rolled RoundsSize in Inches | Size Tolerance (inches) |
|
Over |
Under |
|
Up thru 5/16 | 0.005 |
0.005 |
Over 5/16 thru 7/16 | 0.006 |
0.006 |
Over 7/16 thru 5/8 | 0.007 |
0.007 |
Over 5/8 thru 7/8 | 0.008 |
0.008 |
Over 7/8 thru 1 | 0.009 |
0.009 |
Over 1 thru 1-1/8 | 0.010 |
0.010 |
Over 1-1/8 thru 1-1/4 | 0.011 |
0.011 |
Over 1-1/4 thru 1-3/8 | 0.012 |
0.012 |
Over 1-3/8 thru 1-1/2 | 0.014 |
0.014 |
Over 1-1/2 thru 2 | 1/64 |
1/64 |
Over 2 thru 2-1/2 | 1/32 |
0 |
Over 2-1/2 thru 3-1/2 | 3/64 |
0 |
Over 3-1/2 thru 4-1/2 | 1/16 |
0 |
Over 4-1/2 thru 5-1/2 | 5/64 |
0 |
Over 5-1/2 thru 6-1/2 | 1/8 |
0 |
Over 6-1/2 thru 8-1/4 | 5/32 |
0 |
Over 8-1/4 thru 9-1/2 | 3/16 |
0 |
Over 9-1/2 | 1/4 |
0 |
Cold Finished Rounds
Size in Inches | Size Tolerance (inches) |
|
Over |
Under |
|
Up thru 1-1/2 | 0 |
0.006 |
Over 1-1/2 thru 2-1/2 | 0 |
0.007 |
Over 2-1/2 thru 4 | 0 |
0.008 |
Hexagons
Size in Inches | Size Tolerance (inches) |
|
Over |
Under |
|
Up thru 3/4 | 0 |
0.007 |
Over 3/4 thru 1-1/2 | 0 |
0.008 |
Over 1-1/2 thru 2-1/2 | 0 |
0.009 |
Over 2-1/2 thru 3-1/2 | 0 |
0.010 |
DCF Flats
Size Tolerance (inches) |
||
Over |
Under |
|
Thickness | 0.020/0.040 |
0 |
Width | 0.060/0.120 |
0 |
Aluminum
Extruded Rounds, Squares & FlatsSize in Inches | Size Tolerance (inches) |
|
Over |
Under |
|
Up to 1/8 | 0.006 |
0.006 |
1/8 up to 1/4 | 0.007 |
0.007 |
1/4 up to 1/2 | 0.008 |
0.008 |
1/2 up to 3/4 | 0.009 |
0.009 |
3/4 up to 1 | 0.010 |
0.010 |
1 up to 1-1/2 | 0.012 |
0.012 |
1-1/2 up to 2 | 0.014 |
0.014 |
2 up to 4 | 0.024 |
0.024 |
4 up to 6 | 0.034 |
0.034 |
6 up to 8 | 0.044 |
0.044 |
8 up to 10 | 0.054 |
0.054 |
6061 Plate
Thickness | Size Tolerance (inches) |
|
Over |
Under |
|
1/8 | 0.005 |
0.005 |
3/16 | 0.010 |
0.010 |
1/4 thru 5/16 | 0.013 |
0.013 |
3/8 | 0.019 |
0.019 |
1/2 thru 5/8 | 0.025 |
0.025 |
3/4 thru 7/8 | 0.030 |
0.030 |
1 thru 1-1/8 | 0.035 |
0.035 |
1-1/4 thru 1-3/8 | 0.040 |
0.040 |
1-1/2 thru 1-5/8 | 0.045 |
0.045 |
1-3/4 thru 1-7/8 | 0.052 |
0.052 |
2 thru 2-1/4 | 0.060 |
0.060 |
2-1/2 thru 2-3/4 | 0.075 |
0.075 |
3 | 0.090 |
0.090 |
3-1/2 thru 4 | 0.110 |
0.110 |
4-1/2 thru 5 | 0.125 |
0.125 |
5-1/2 up | 0.135 |
0.135 |
Mic6 Cast Aluminum Plate
Thickness | Size Tolerance (inches) |
|
Over |
Under |
|
1/4 up thru 6 | 0.005 |
0.005 |
360 Brass
Rounds and HexSize in Inches | Size Tolerance (inches) |
|
Rounds |
Hex |
|
Up to .150 | +/- .0013 |
+/- .0025 |
Over .150 thru 1/2 | +/- .0015 |
+/- .003 |
Over 1/2 thru 1 | +/- .002 |
+/- .004 |
Over 1 thru 2 | +/- .0025 |
+/- .005 |
Over 2 | +/- .15% |
+/- .30% |
Flat and Square Thickness
Thickness in Inches | Size Tolerance (inches) |
|
Up to 2" Wide |
Over 2" Wide |
|
.062 thru .130 | +/- .0035 |
+/- .0035 |
Over .130 thru .188 | +/- .004 |
+/- .004 |
Over .188 thru 1/2 | +/- .0045 |
+/- .006 |
Over 1/2 thru 1 | +/- .005 |
+/- .007 |
Over 1 thru 2 | +/- .005 |
+/- .008 |
Over 2 thru 4 | +/- .30% |
+/- .30% |
Flat Width
Width in Inches | Size Tolerance (inches) |
|
.130 thru .188 | +/- .003 |
|
Over .188 thru 1/2 | +/- .0035 |
|
Over 1/2 thru 1-1/4 | +/- .005 |
|
Over 1-1/4 thru 2 | +/- .008 |
|
Over 2 thru 4 | +/- .012 |
|
Over 4 | +/- .30% |
Carbon Steel
Cold Finished RoundsSize in Inches | Size Tolerance (inches) |
|
Over |
Under |
|
Up thru 1-1/2 | 0 |
0.002 |
Over 1-1/2 thru 2-1/2 | 0 |
0.003 |
Over 2-1/2 thru 4 | 0 |
0.004 |
4 thru 6 | 0 |
0.005 |
6 thru 8 | 0 |
0.006 |
8 thru 10 | 0 |
0.007 |
Over 10 (rough turned) | 0.125/0.188 |
0 |
Cold Finished Flats
Width in Inches | Size Tolerance (inches) |
|
Over |
Under |
|
Up thru 3/4 | 0 |
0.003 |
Over 3/4 thru 1-1/2 | 0 |
0.004 |
Over 1-1/2 thru 3 | 0 |
0.005 |
Over 3 thru 4 | 0 |
0.006 |
Over 4 thru 6 | 0 |
0.008 |
Over 6 | 0 |
0.013 |
Squares & Hexagons
Size in Inches | Size Tolerance (inches) |
|
Over |
Under |
|
Up thru 3/4 | 0 |
0.002 |
Over 3/4 thru 1-1/2 | 0 |
0.003 |
Over 1-1/2 thru 2-1/2 | 0 |
0.004 |
Over 2-1/2 thru 4 | 0 |
0.005 |
Over 4 thru 5 | 0 |
0.010 |
Ground & Polished 1144 Stressproof
Size in Inches | Size Tolerance (inches) |
|
Over |
Under |
|
Up thru 1-1/2 | 0 |
0.001 |
Over 1-1/2 thru 2-1/2 | 0 |
0.0015 |
Over 2-1/2 thru 3 | 0 |
0.002 |
Over 3 | 0 |
0.003 |
Freemax DCF Flats
Size Tolerance (inches) |
||
Over |
Under |
|
Thickness | 0.020/0.040 |
0 |
Width | 0.060/0.120 |
0 |
Stainless Steel
Cold Finished RoundsSize in Inches | Size Tolerance (inches) |
|
Over |
Under |
|
1/8 up to 5/16 | 0.001 |
0.001 |
5/16 up to 1/2 | 0.0015 |
0.0015 |
1/2 up to 1 | 0.002 |
0.002 |
1 up to 1-1/2 | 0.0025 |
0.0025 |
1-1/2 up to 4 | 0.003 |
0.003 |
Rough Turned Rounds
Size in Inches | Size Tolerance (inches) |
|
Over |
Under |
|
2 up to 2-1/2 | 0.023 |
0 |
Over 2-1/2 thru 3-1/2 | 0.035 |
0 |
Over 3-1/2 thru 4-1/2 | 0.046 |
0 |
Over 4-1/2 thru 5-1/2 | 0.058 |
0 |
Over 5-1/2 thru 6-1/2 | 0.125 |
0 |
Over 6-1/2 thru 8 | 0.156 |
0 |
Over 8 thru 12 | 0.187 |
0 |
T303 Bearing Shaft Quality
Size in Inches | Size Tolerance (inches) |
|
Over |
Under |
|
1/4 up to 2 | 0 |
0.0005/0.0015 |
Squares & Hexagons
Size in Inches | Size Tolerance (inches) |
|
Over |
Under |
|
1/8 up to 5/16 | 0 |
0.002 |
5/16 up to 1/2 | 0 |
0.003 |
1/2 thru 1 | 0 |
0.004 |
Over 1 thru 2 | 0 |
0.006 |
Over 2 thru 3 | 0 |
0.008 |
Sheared Flats
Thickness | Size Tolerance (inches) |
|
Thickness |
Width |
|
1/8 | +/-0.010 |
+0.094/-0.031 |
3/16 thru 3/8 | +0.050/-0.010 |
+0.094/-0.031 |
True Bar Flats
Width | Size Tolerance (inches) |
|
Thickness |
Width |
|
Up thru 1 | +/-0.010 |
+/-0.015 |
Over 1 thru 2 | +/-0.015 |
+/-0.031 |
Over 2 thru 4 | +/-0.020 |
+0.062/-0.031 |
Over 4 thru 6 | +/-0.020 |
+0.093/-0.062 |
Tool Steel
DCF FlatsSize Tolerance (inches) |
||
Over |
Under |
|
Thickness | 0.020/0.040 |
0 |
Width | 0.060/0.120 |
0 |
DCF Rounds
Size in Inches | Size Tolerance (inches) |
|
Over |
Under |
|
1/2 thru 1-1/2 | 0.010/0.020 |
0 |
Over 1-1/2 up to 3 | 0.015/0.025 |
0 |
3 thru 6 | 0.062/0.188 |
0 |
Over 6 thru 7 | 0.093/0.188 |
0 |
Over 7 | 0.125/0.250 |
0 |
PGFS & Drill Rod
PGFS Standard ToleranceSize Tolerance (inches) |
||
Over |
Under |
|
Thickness | 0.001 |
0.001 |
Width | 0.000/0.005 |
0 |
PGFS Oversize Tolerance
Size Tolerance (inches) |
||
Over |
Under |
|
Thickness | 0.010/0.015 |
0 |
Width | 0.010/0.015 |
0 |
Round Drill Rod
Size in Inches | Size Tolerance (inches) |
|
Over |
Under |
|
Up to 1/8 | 0.0003 |
0.0003 |
1/8 up to 1/2 | 0.0005 |
0.0005 |
1/2 thru 3 | 0.001 |
0.001 |
Hardened & Ground Round
Tolerance: +/-.0005"This data is for informational purposes only and based upon generally accepted industry standards and are not guaranteed to be accurate. Data on any particular material may vary from values shown.