: It provides permissible deviations for machining dimensions (typically less than 2000 mm) when specific tolerances are not indicated on a drawing by individual numerals or symbols. Context within Mitsubishi Fuso : It is an annex standard often cited alongside
| | MS81-2021 Clarification (from PDF) | | :--- | :--- | | Using the same ISO cleanliness code for all machines | Section 5.3: Target codes depend on bearing type, speed factor (DN), and oil film thickness. A wind turbine main bearing (DN > 500,000) requires ISO 14/11/9, not 16/13/10. | | Sampling from the bottom drain valve | Section 6.2.1 explicitly prohibits drain sampling. Use a vacuum pump or dedicated sample port, at least 6” above sediment zone. | | Ignoring water activity (aw) | Section 7.1.5: For ester-based oils, aw > 0.6 triggers immediate action, even if Karl Fischer < 500 ppm. |
The or revision number of your drawing.
The primary purpose of the MS81 technical protocol is to establish a uniform system of dimensional rules for sheet metal processing. Its integration into a manufacturing workflow ensures several distinct operational benefits:
I can help clarify specific deviation limits or point you toward the correct administrative engineering protocols. Share public link Ms81-2021 Standard Pdf
This standard is essential for manufacturers, engineers, and fire safety authorities to ensure that fire hydrants are durable and functional during emergencies.
: Acts as a legally binding reference point within Requests for Quotation (RFQs) to align expectations between OEMs and third-party suppliers. Technical Scope & Application | | Sampling from the bottom drain valve | Section 6
The MSS SP-81 standard is also available internationally. For instance, the Chinese national digital standards library includes the Chinese translation of MSS SP-81-2021: "不锈钢或不锈钢衬里、无阀盖、带法兰端的刀闸阀," which includes the errata from 2022.
For basic lengths, widths, and steps, MS81 divides measurements into progressive brackets (e.g., 0.5mm to 3mm, 3mm to 6mm, up to several hundred millimeters). | The or revision number of your drawing
: Checking for leaks or ruptures under high pressure.