Ms81-2021 Standard Pdf ^new^ Jun 2026

Areas for Improvement

Revisions occur every 5-7 years. The next scheduled revision is 2027. The 2021 PDF remains valid until then, though a supplement (MS81-2023-S1) was issued for hydrogen fuel cell compressors.

The standard specifies permissible deviations for linear dimensions up to 2000 mm when individual tolerances are not indicated on the drawing. Nominal Dimension (mm) 1st Class Tolerance (mm) 2nd Class Tolerance (mm) 6 and under ±0.1plus or minus 0.1 ±0.2plus or minus 0.2 Over 6 up to 30 ±0.2plus or minus 0.2 ±0.5plus or minus 0.5 Over 30 up to 120 ±0.3plus or minus 0.3 ±0.8plus or minus 0.8 Over 120 up to 315 ±0.5plus or minus 0.5 ±1.2plus or minus 1.2 Over 315 up to 1000 ±0.8plus or minus 0.8 ±2.0plus or minus 2.0 Key Application Details

Areas for Improvement

Revisions occur every 5-7 years. The next scheduled revision is 2027. The 2021 PDF remains valid until then, though a supplement (MS81-2023-S1) was issued for hydrogen fuel cell compressors. Ms81-2021 Standard Pdf

The standard specifies permissible deviations for linear dimensions up to 2000 mm when individual tolerances are not indicated on the drawing. Nominal Dimension (mm) 1st Class Tolerance (mm) 2nd Class Tolerance (mm) 6 and under ±0.1plus or minus 0.1 ±0.2plus or minus 0.2 Over 6 up to 30 ±0.2plus or minus 0.2 ±0.5plus or minus 0.5 Over 30 up to 120 ±0.3plus or minus 0.3 ±0.8plus or minus 0.8 Over 120 up to 315 ±0.5plus or minus 0.5 ±1.2plus or minus 1.2 Over 315 up to 1000 ±0.8plus or minus 0.8 ±2.0plus or minus 2.0 Key Application Details Areas for Improvement Revisions occur every 5-7 years