Astm Sheet Metal Tolerances

Astm s steel standards are instrumental in classifying evaluating and specifying the material chemical mechanical and metallurgical properties of the different types of steels which are primarily used in the production of mechanical components industrial parts and construction elements as well as other accessories related to them.

Astm sheet metal tolerances.

Theoretical nominal weight tnw weight based upon the lineal footage using nominal weight per foot. The following charts give typical astm and ansi steel sheet mechanical tolerance ranges. It applies to the following specifications that describe carbon steel structural steel and high strength low alloy steel hsla furnished as hot rolled sheet and cold rolled sheet. 0236 plus 004 is considered the nominal for 24 ga.

And astma653 a653m 94 standard specification for sheet steel zinc coat galvanized or zinc iron alloy coated galvanized by the hot dip process. 1 1 this specification covers the general requirements for steel sheet in coils and cut lengths. 0236 004 0276. This explains why 11 gauge at 0 1196 inch is called 1 8th inch.

Table a2 8 permitted variations in flatness of cold rolled wide coil processed product as cut lengths. Actual weight actual scale weight of the coil. 0236 plus 008 is considered to be 24 ga. Astm a480hot rolled sheet coil thickness tolerance.

These measurements are based on astm a924 924m 94 standard specification for general requirements for sheet steel metallic coated by the hot dip process formerly astma525. Thcikness in mm deviation allowed for the specified width w in mm w 60 1525 w 60 1525 0 072 1 83 0 006 0 15 0 009 0 22 0 072 1 83 0 083 2 11 0 007 0 18 0 010 0 25 0 083 2 11 0 098 2 49 0 008 0 20 0 011 0 27. The permitted thickness would be from 0 1196 to 0 1356 as this thickness permits 0 016 inch tolerance for sheets over 40 inch wide. During the rolling process the rollers bow slightly which results in the sheets being thinner on the edges.

Astm ansi mechanical steel sheet mechanical tolerances. Let s say that 11 gauge has a nominal thickness of 0 1196 inch from memory. The tolerances in the table and attachments reflect current manufacturing practices and commercial standards and are not representative of the manufacturer s standard gauge which has no inherent tolerances. 253 330 333 304 309 316 321 347 410 446 2205 2507 2101 17 4 17 5 800 tolerances listed were taken from astm a480 reference only cold rolled coil.

Tolerance below apply to the following alloys. Astm a240 a480 steel sheet sthickness tolerance. Sheet metal guage tolerances. Specifications a414 a414m a424 a424m a606 a606m a659 a659m a794 a794m a1008 a1008m a1011 a1011m and a1039.

The tolerance is only 0 014 inch for sheet narrower than 40 inches. Browse by astm or ams select by astm or ams i e.