: Check that the document explicitly lists Annex MS81-2021 Rev. 2 or later to avoid obsolete measurements.
, this standard ensures that parts produced by metal removal meet strict quality benchmarks. 2. Key Scope and Applications The standard applies to dimensions produced through metal removal (machining), including: Linear Dimensions:
: Covers unspecified corner roundings, fillets, and chamfers.
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specifically pertains to the dimensional and material requirements for specialized threaded fasteners and washers, often involving corrosion-resistant steel coatings. Unlike generic commercial standards, MS812021 includes: ms812021 standard pdf best
The identifier MS 81:2021 appears to refer to a specific technical standard or internal corporate regulation, most notably used by Mitsubishi Fuso Truck & Bus Corporation as an annex for general machining tolerances.
: Machining a batch of components using outdated revision classes (such as older Class 1 or Class 2 parameters replaced by newer f/m/c designations) can result in an entire production batch being scrapped.
Drawings adhering to the MS81-2021 revision are typically divided into distinct accuracy categories, commonly referred to as "Classes". Tolerance Category Typical Application Accuracy Level
For legacy engineering tasks, EverySpec MS21209 Repositories provide zero-cost downloads of the complete "Revision E" layout. This platform hosts standard unredacted military specifications in scanned print formats. It includes historic revision notes showing the standard’s transition trail. 2. ASSIST-QuickSearch (Best for Official Audits) : Check that the document explicitly lists Annex
The Department of Standards Malaysia (JSM) is the national body that publishes and maintains Malaysian Standards (MS).
The standard provides a uniform framework for manufacturers, ensuring performance and safety. The key requirements include:
: This includes external diameters, internal bores, step heights, thickness, distances, corner roundings, and chamfers.
Academic or engineering institutions often have access to these documents. ensuring performance and safety.
Below is the foundational breakdown of permissible deviations for linear dimensions under the standard: Nominal Dimension Range (mm) 1st Class (Fine/Medium) 2nd Class (Coarse) ±0.1plus or minus 0.1 ±0.2plus or minus 0.2 Over 6 up to and including 30 ±0.2plus or minus 0.2 ±0.5plus or minus 0.5 Over 30 up to and including 120 ±0.3plus or minus 0.3 ±0.8plus or minus 0.8 Over 120 up to and including 315 ±0.5plus or minus 0.5 ±1.2plus or minus 1.2 Over 315 up to and including 1000 ±0.8plus or minus 0.8 ±2.0plus or minus 2.0
: It applies automatically to any machine-cut dimension that lacks explicit tolerance callouts.
Linear and angular dimensions obtained through the machining of assembled components. 3. Tolerance Classes
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