Understanding the Actual Thickness of 1.5mm Stainless Steel Sheet

1. What is the actual thickness of 1.5 thick stainless steel? What is the actual thickness of a 1.5mm stainless steel plate? I recently purchased a 1.5mm thick stainless steel sheet, but the actual thickness measured was only 1.3mm. Is this in accordance with national standards? The actual thickness of 304 stainless steel with a […]

Table Of Contents

1. What is the actual thickness of 1.5 thick stainless steel?

What is the actual thickness of a 1.5mm stainless steel plate?

I recently purchased a 1.5mm thick stainless steel sheet, but the actual thickness measured was only 1.3mm. Is this in accordance with national standards?

The actual thickness of 304 stainless steel with a nominal thickness of 1.5mm is usually less than 1.5mm.

What is the standard thickness for 1.5mm stainless steel?

According to national standards, the acceptable positive and negative tolerance for a 1.5mm thick stainless steel sheet should fall within a specified range.

The difference between standard and actual thickness for stainless steel is that the standard thickness is typically greater than the actual thickness.

The difference in thickness between actual and standard thickness should conform to relevant standards.

2. Allowable thickness deviation of 1.5 thick stainless steel plate

What is the national standard for the thickness tolerance of a 1.5mm cold-rolled stainless steel sheet?

The national standard for the thickness of a 1.5mm cold-rolled stainless steel sheet is specified in GBT3280-2015 Cold Rolled Stainless Steel Plate and Strip.

The actual thickness of a 1.5mm stainless steel sheet must conform to the following guidelines:

Allowable thickness deviation of 1.5mm stainless steel plate

National standard Tolerance requirements (unit: mm)
Standard name Situation   PT.A PT.B
GB/T3280-2015 Cold Rolled Stainless Steel Plate and Strip Wide steel strip and rolled steel plate, longitudinal wide steel strip and rolled steel strip Width case <1250 1250~2100 600~<1000 1000~<1250 1250~2100
Tolerance ±0.12 ±0.15 ±0.07 ±0.08 ±0.10
Narrow steel strip and coiled steel strip   PT.A PT.B
Width case <125 125~<250 250~<600 <125 125~<250 250~<600
Tolerance ±0.035 ±0.04 ±0.045 ±0.03 ±0.035 ±0.04
  • The permissible deviation in thickness must adhere to the provisions of general accuracy (PT. A). If the buyer requires it and it is specified in the contract, a higher level of precision (PT. B) can be utilized.
  • For instance, when a 1.5mm thick stainless steel plate is 1219mm wide, the tolerance for ordinary accuracy is 1.38-1.62mm, and for higher accuracy it is 1.42-1.58mm. This means that the minimum thickness for a 1.5mm * 1219mm stainless steel plate must be at least 1.38mm.

3. Minimum thickness requirements of 1.5 thick stainless steel plate

According to the national standard table, the minimum required actual thickness for stainless steel sheets of certain specifications must meet the following standards:

  • For a 1.5mm thick and 1000mm wide stainless steel sheet, the actual thickness must be at least 1.38mm.
  • For a 1.5mm thick and 1219mm wide stainless steel sheet, the actual thickness must be at least 1.38mm.
  • For a 1.5mm thick and 1500mm wide stainless steel sheet, the actual thickness must be at least 1.35mm.
  • For a 1.5mm thick and 1800mm wide stainless steel sheet, the actual thickness must be at least 1.35mm.
  • For a 1.5mm thick and 2000mm wide stainless steel sheet, the actual thickness must be at least 1.35mm.

When purchasing a stainless steel sheet, if it is stated to be 1.5mm thick but the actual measurement is only 1.3mm, it does not meet the national standard. The actual thickness and minimum required thickness to meet the standard vary depending on the specifications of the stainless steel sheet.

What is the actual thickness of the 1.5mm stainless steel plate and what thickness must be reached to meet the standard? I assume you have your own answer.

4. Provisions of other standards on 1.5mm thick stainless steel

The actual thickness of a stainless steel plate should be determined according to the relevant standard. For example, as per Japanese standard JIS G4305:2012 for Cold Rolled Stainless Steel Plate, Sheet, and Strip, a 1.5mm stainless steel plate (wide strip and rolled plate, longitudinal wide strip and rolled strip) has a precision of ± 0.12mm when its width is less than 1250mm and ± 0.15mm when its width is between 1250-1600mm.

Therefore, according to the Japanese standard:

(1) The actual thickness of a 1.5mm thick and 1000mm wide stainless steel plate must not be less than 1.38mm;

(2) For a 1.5mm thick and 1219mm finished stainless steel plate, the actual thickness must not be less than 1.38mm;

(3) The actual thickness of a 1.5mm thick and 1500mm finished stainless steel plate must not be less than 1.35mm, which is in line with the national standard GB/T3280-2015.

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Shane
Author

Shane

Founder of MachineMFG

As the founder of MachineMFG, I have dedicated over a decade of my career to the metalworking industry. My extensive experience has allowed me to become an expert in the fields of sheet metal fabrication, machining, mechanical engineering, and machine tools for metals. I am constantly thinking, reading, and writing about these subjects, constantly striving to stay at the forefront of my field. Let my knowledge and expertise be an asset to your business.

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