The Anderon is a unit of bearing vibration equal to 1 μm/s RMS velocity. It was developed by the bearing industry (named after the Anderson meter) to quantify rolling element bearing vibration during manufacturing quality checks at a standard speed of 1800 RPM.

ISO 15242 defines methods for measuring vibration of rolling bearings. It specifies three frequency bands: Low (50–300 Hz), Medium (300–1800 Hz), and High (1800–10000 Hz). Each band captures different defect types.

What do the frequency bands represent?

Low band (50–300 Hz): waviness of raceways. Medium band (300–1800 Hz): surface roughness and minor defects. High band (1800–10000 Hz): micro-defects, contamination, and noise. Each band has separate acceptance limits.

How do I convert μm/s to Anderon?

1 Anderon = 1 μm/s RMS velocity. So the conversion is direct: a measurement of 50 μm/s = 50 Anderon. The measurement is typically performed at 1800 RPM inner ring rotation with outer ring fixed.

What are typical Anderon limits for good bearings?

For ABEC-1 (P0) bearings: Low band < 50 And, Medium < 40 And, High < 35 And. For ABEC-5 (P5): Low < 25 And, Medium < 20 And, High < 15 And. Precision grades have even tighter limits.

Free Engineering Tool — #030

Bearing Vibration Anderon Calculator

Convert bearing vibration measurements to Anderon units per ISO 15242. Enter measured vibration velocity for each frequency band and bearing grade to assess quality.

ISO 15242Anderon UnitsABEC Grades

Results

Overall Assessment

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Low Band

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Medium Band

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High Band

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Overall (RSS)

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Anderon Unit

Measured at standard speed (typically 1800 RPM inner ring rotation, outer ring stationary).

ISO 15242 Frequency Bands

Band	Frequency Range	Defect Type
Low	50–300 Hz	Waviness, out-of-round
Medium	300–1800 Hz	Surface roughness, minor defects
High	1800–10000 Hz	Micro-defects, contamination

Typical Limits (Anderon)

Grade	Low	Medium	High
ABEC-1 (P0)	≤ 50	≤ 40	≤ 35
ABEC-3 (P6)	≤ 35	≤ 30	≤ 25
ABEC-5 (P5)	≤ 25	≤ 20	≤ 15
ABEC-7 (P4)	≤ 15	≤ 12	≤ 10
ABEC-9 (P2)	≤ 10	≤ 8	≤ 6

ℹ️ Note: Actual limits vary by bearing size and manufacturer. These are representative values. Always consult the bearing manufacturer's specifications.

Bearing Vibration Anderon Calculator | ISO 15242 | Free Online Tool

Published by admin on February 15, 2026 February 15, 2026

Results

Anderon Unit

ISO 15242 Frequency Bands

Typical Limits (Anderon)