Luminum

Standard Tolerances Of Aluminum Wire, Rod & Bar



The tables below provide general information on the tolerances of wire, rod and bar.

The tolerances are based on published standards used throughout the industry.


Diameter — Round Wire And Rod, Cold Finished

  Tolerance In Inches
Specified Diameter
In Inches
Drawn Wire Cold Finished Rod Rolled Rod
Over or Under Over Under
>= 0.125 <= 0.374 ± 0.0015 - - -
>= 0.375 <= 0.500 - ± 0.0015 - -
>= 0.501 <= 1.000 - ± 0.002 - -
>= 1.001 <= 1.500 - ± 0.0025 - -
>= 1.501 <= 2.000 - ± 0.004 + 0.006 - 0.006
>= 2.001 <= 3.000 - ± 0.008 + 0.008 -
>= 3.001 <= 3.499 - ± 0.008 + 0.012 - 0.012
>= 3.500 <= 5.000 - ± 0.008 + 0.012 - 0.012
>= 5.001 <= 8.000 - - + 0.062 - 0.031

Distance Across Flats — Square Or Hex Bar, Cold Finished

Specified Distance Across Flats Tolerance In Inches
>= 0.375 <= 0.500 ± 0.002
>= 0.501 <= 1.000 ± 0.0025
>= 1.001 <= 1.500 ± 0.003
>= 1.501 <= 2.000 ± 0.005
>= 2.001 <= 3.000 ± 0.008

Diameter Or Distance Across Flats —
Round, Hex, Square Or Rectangular Rod And Bar, Extruded

Specified Size Tolerance In Inches
>= 0.250 <= 0.499 ± 0.008
>= 0.500 <= 0.749 ± 0.009
>= 0.750 <= 0.999 ± 0.010
>= 1.000 <= 1.499 ± 0.012
>= 1.500 <= 1.999 ± 0.014
>= 2.000 <= 3.999 ± 0.024
>= 4.900 <= 5.999 ± 0.034
>= 6.000 <= 7.999 ± 0.044
>= 8.000 - ± 0.054

Diameter — Class I Forging Stock

  Tolerance In Inches
Specified Diameter Allowable Deviation Conditioning Allowance
>= 0.375 <= 3.000 ± 0.015 - 1/32
>= 3.001 <= 5.000 ± 0.031 - 1/16
>= 5.001 <= 8.000 ± 0.063 - 1/16

Diameter — Class II Forging Stock

  Tolerance In Inches
Specified Diameter Allowable Deviation
>= 0.375 <= 0.500 ± 0.015
>= 0.501 <= 1.000 ± 0.002
>= 1.001 <= 1.500 ± 0.025
>= 1.501 <= 3.000 ± 0.008

Thickness And Width — Rectangular Bar, Cold Finished

  Tolerance In Inches
Specified Dimension Thickness Width
>= 0.125 <= 0.500 ± 0.002 ± 0.002
>= 0.501 <= 1.000 ± 0.0025 ± 0.0025
>= 1.001 <= 1.500 ± 0.003 ± 0.003
>= 1.501 <= 2.000 ± 0.005 ± 0.005
>= 2.001 <= 3.000 ± 0.008 ± 0.008
>= 3.001 <= 4.000 - ± 0.010

Twist — Square Or Rectangular Bar, Cold Finished
All Tempers Except T351, T651, T7351

Allowable twist per segment length is based on deviation in total length or deviation in any measured segment of one foot or more, expressed in degrees per foot of segment length.  Maximum is deviation in total length of material.

  Twist Tolerance
Specified Width Segment Length Maximum
- <= 1.499 1º X length
>= 1.500 <= 2.999 0.5º X length
>= 3.000 - 0.25º X length

Twist — Square Or Rectangular Bar, Cold Finished
Tempers T531, T651, T7351

Allowable twist per segment length is based on deviation in total length or deviation in any measured segment of one foot or more, expressed in degrees per foot of segment length.  Maximum is deviation in total length of material.

  Twist Tolerance
Specified Width Segment Length Maximum
>= 0.500 <= 2.999 1.5º X length
>= 3.000 - 0.5º X length

Twist — Hexagonal Bar, Cold Finished

Allowable twist per segment length is based on deviation in total length or deviation in any measured segment of one foot or more, expressed in degrees per foot of segment length.  Maximum is deviation in total length of material.

  Twist Tolerance
Specified Width Across Flats Segment Length Maximum
- <= 1.499 1º X length
>= 1.500 <= 2.999 0.5º X length
>= 3.000 - 0.25º X length

Straightness — Rod Or Hex Bar Other Than Screw Machine Stock
All Tempers Except T531, T651, T7351

Tolerances are expressed in inches per total length or inches in any measured segment of at least one foot or more.  Specified dimension is diameter or distance across flats.

  Tolerance In Inches
Specified Dimension Segment Deviation
All 0.25 X length

Straightness — Rod Or Hex Bar Other Than Screw Machine Stock
Tempers T531, T651, T7351

Tolerances are expressed in inches per total length or inches in any measured segment of at least one foot or more.  Specified dimension is diameter or distance across flats.

  Tolerance In Inches
Specified Dimension Segment Deviation
>= 0.500 - 0.25 X length

Straightness — Square or Rectangular Bar Other Than Screw Machine Stock
All Tempers Except T531, T651, T7351

Tolerances are expressed in inches per total length or inches in any measured segment of at least one foot or more.  Specified dimension is thickness or distance across flats.

  Tolerance In Inches
Specified Dimension Segment Deviation
All 0.25 X length

Straightness — Square or Rectangular Bar Other Than Screw Machine Stock
Tempers T531, T651, T7351

Tolerances are expressed in inches per total length or inches in any measured segment of at least one foot or more.  Specified dimension is thickness or distance across flats.

  Tolerance In Inches
Specified Dimension Segment Deviation
>= 0.500 - 0.5 X length

Straightness — Screw Machine Stock, Cold Finished
All Tempers Except T531, T651, T7351

Segment tolerances are expressed in inches per total length or inches in any measured segment of at least one foot or more.  Length tolerances are deviations in inches per 12-foot length.  Specified dimension is thickness or distance across flats.

  Tolerance In Inches
Specified Dimension Segment Deviation Length Deviation
All 0.125 X length 0.100

Straightness — Screw Machine Stock, Cold Finished
Tempers T531, T651, T7351

Segment tolerances are expressed in inches per total length or inches in any measured segment of at least one foot or more.  Length tolerances are deviations in inches per 12-foot length.  Specified dimension is thickness or distance across flats.

  Tolerance In Inches
Specified Dimension Segment Deviation Length Deviation
>= 0.500 - 0.125 X length 0.100

Length

Specified dimension is diameter, width or width across flats.

  Tolerance In Inches Per Length In Feet
Specified Dimension Up to 12' 12' - 30' 30' - 50' > 50'
- <= 2.999 1/8 1/4 3/8 1
>= 3.000 <= 7.999 3/16 5/16 7/16 1
>= 8.000 - 1/4 3/8 1/2 1

Flatness — Cold Finished Bar

  Tolerance In Inches
Surface Width In Inches Segment Deviation
Up to 1 .004
Over 1 .004 X Width
In any 1 inch of width .004

Squareness Of Saw Cuts


Angularity


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