Shaft failure is catastrophic. A broken shaft inside a high-speed turbine or a heavy press can send shrapnel flying, destroy adjacent equipment, and cause severe injuries. ASME B106.1M provides safety factors tested over decades of industrial use.
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ASME B106.1M is an American National Standard titled: "Design of Transmission Shafting for Mechanical Power Transmission."
Published by the American Society of Mechanical Engineers (ASME) , this standard provides a uniform methodology for the design, rating, and selection of power transmission shafting. Specifically, it covers solid and hollow cylindrical shafts used in general industrial machinery.
The "M" in the title denotes that the standard uses SI (Metric) units, aligning with global engineering practices while maintaining the rigorous safety factors expected from ASME. Asme B106.1m Pdf
Measurement Parameters: Unlike later standards (ISO 10816), B106.1m focuses heavily on velocity (mm/s, RMS) as the primary severity indicator because velocity correlates best with mechanical fatigue stress independent of rotational speed.
Machine Classification: The standard separates machinery into rigid (Class I) and flexible (Class II) foundations and distinguishes between small, medium, and large machines based on shaft height and power output.
If you genuinely need this document, here is the safe, legal, and professional workflow:
Let us look at a real-world scenario. A facility has a 150 kW centrifugal pump (flexible foundation) rotating at 1,800 RPM. An engineer obtains the legitimate ASME B106.1m PDF and performs a measurement: Shaft failure is catastrophic
Step 1: Measurement Location Place accelerometers on the bearing housing in three orthogonal axes (vertical, horizontal, axial).
Step 2: Data Collection Record broad-band vibration velocity (RMS). The horizontal measurement reads 7.1 mm/s.
Step 3: Reference the Standard Open the PDF to Table 1 – "Vibration Severity for Rotating Machinery." For a flexible foundation Class II machine (medium size):
Step 4: Diagnosis The measured 7.1 mm/s falls exactly on the boundary between Satisfactory (B) and Unsatisfactory (C). The standard advises: "Values at the boundary should be considered acceptable only if previous trend data shows stability." Since this machine has shown increasing vibration from 4.5 mm/s to 7.1 mm/s over six months, the engineer flags it for maintenance. If you genuinely need this document
Step 5: Report Using Standard Language The maintenance report cites: "Per ASME B106.1m, Clause 4.2, vibration severity is elevated to Zone C. Plan corrective balancing within 30 days."
This level of precision is impossible without the actual standard document.
The only safe, legal, and reliable source for the ASME B106.1m PDF is directly through ASME's digital repository or their authorized resellers. Here is the step-by-step process:
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The standard specifically addresses: