Key Metals Size Tolerances

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Alloy - Aluminum - Carbon - Stainless - Tool Steel - PGFS/Drill Rod - Hardened & Ground Round

Alloy Steel

Hot Rolled Rounds
Size 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 & Flats
Size 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



Carbon Steel

Cold Finished Rounds
Size 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 Rounds
Size 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 Flats
 
Size 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 Tolerance
 
Size 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.