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 Rounds

Size in Inches	Size Tolerance (inches)
Size in 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)
Size in 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)
Size in 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)
Size in 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)
Thickness	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)
Thickness	Over	Under
1/4 up thru 6	0.005	0.005

360 Brass

Rounds and Hex

Size in Inches	Size Tolerance (inches)
Size in 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)
Thickness in 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)
Width in 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 Rounds

Size in Inches	Size Tolerance (inches)
Size in 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)
Width in 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)
Size in 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)
Size in 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)
Size in 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)
Size in 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)
Size in Inches	Over	Under
1/4 up to 2	0	0.0005/0.0015

Squares & Hexagons

Size in Inches	Size Tolerance (inches)
Size in 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	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)
Width	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)
Size in 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)
Size in 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.