Machining and Decarburization Limits

Minimum Allowances For Machining and Maximum Decarburization Limits (Hot Rolled Square and Flat Bars*)

machining

Ordered Thickness Inches Minimum Allowance Per Side for Machining Prior to Heat Treatment, Inch
Ordered Width. Inches
0 to ½ Incl. Over ½ to 1 incl. Over 1 to 2 incl. Over 2 to 3 incl. Over 3 to 4 incl. Over 4 to 5 incl. Over 5 to 6 incl. Over 6 to 7 incl. Over 7 to 8 incl. Over 8 to 9 incl. Over 9 to 10 incl.
0 to ½ incl. A .025 .025 .030 .035 .040 .045 .050 .055 .060 .060 .060
B .025 .036 .044 .056 .068 .092 .104 .120 .136 .144 .152
Over ½ to 1 incl. A .045 .045 .050 .055 .060 .070 .070 .075 .075 .075
B .045 .052 .064 .080 .104 .120 .136 .160 .160 .160
Over 1 to 2 incl. A .065 .065 .070 .070 .075 .075 .090 .095 .100
B .065 .075 .084 .112 .124 .144 .168 .180 .180
Over 2 to 3 incl. A .085 .085 .085 .085 .090 .100 .100 .100
B .085 .102 .120 .136 .160 .180 .190 .190
Over 3 to 4 incl. A .115 .115 .115 .115 .125 .125 .125
B .115 .127 .140 .180 .190 .190 .190
Over 4 to 5 incl. A .150 .150 .150 .150 .150 .150
B .150 .165 .180 .190 .190 .190
Over 5 to 6 incl. A .190 .190 .190 .190 .190
B .190 .190 .190 .190 .190
Over 6 A .250 .250 .250. .250
B .250 .250 .250 .250
MAXIMUM DECARBURIZATION LIMITS
80 Percent of above allowance per side

*These allowances also applicable to Cold Drawn Bars where cold drawn sizes are available.

Minimum Allowances For Machining and Maximum Decarburization Limits (Forged Square and Flat Bars)machining

Ordered Thickness Inches Minimum Allowance Per Side for Machining Prior to Heat Treatment. Inch
Ordered Width. Inches
0 to ½ incl. Over ½ to 1 incl. Over 1 to 2 incl. Over 2 to 3 incl. Over 3 to 4 incl. Over 4 to 5 incl. Over 5 to 6 incl. Over 6 to 7 incl. Over 7 to 8 incl. Over 8 to 9 incl. Over 9 to 10 incl.
0 to ½ incl. A .030 .030 .035 :040 I .045 .055 .065 .070 .075
B .030 .048 .064 .080 .100 .120 .144 .168 200
Over ½ to 1 incl. A .060 .060 .065 .065 .075 .080 .085 .090 .090 .110
B .060 .072 .084 .100 .120 .144 .168 .200 .200 200
Over I to 2 incl. A .090 .090 .090 .100 .110 .115 .125 .140 .150
B .090 .100 .108 .124 .148 .172 200 .200 .200
Over 2 to 3 incl. A .120 .120 .125 .130 .135 .150 .160 .175
B .120 .130 .140 .148 .172 .200 .200 .200
Over 3 to 4 incl. A .150 .150 .160 .180 .200 .210 .225
B .150 .150 .160 .180 200 .210 .225
Over 4 to 5 incl. A .180 .180 .190 210 .225 .250
B .180 .180 .190 .210 .225 .250
Over 5 to 6 incl. A .210 .225 .225 .250 .250
B .210 .225 .225 .250 .250
Over 6 A .250 .250 .250 .250
B .250 .250 .250 .250
MAXIMUM DECARBURIZATION LIMITS
80 Percent of above allowances per side
Data is typical and should not be construed as actual values for any category.
Applications and technical information require engineers and tool designers to exercise independent judgement.