VIBRATION STANDARDS

V1 V2 V3 VELOCITY LIMIT CHART

TECHNICAL SPECIFICATION

Bearing Vibration Standards & Technical Specifications

Bearing Vibration Standards are the primary indicators of a bearing's manufacturing quality and rotational smoothness. In the demanding world of industrial engineering, excessive vibration is more than just an annoyance—it is a sign of internal friction, misalignment, or surface defects that can lead to catastrophic system failure.

By adhering to international Bearing Vibration Standards, ZGBK ensures that every component provides the silent operation required for precision applications. For a complete understanding of how materials impact these levels, refer to our technical guide on Materials & Accuracy Standards.

Catalogue

1. Importance of Vibration Standards
2. Vibration Velocity Limit Chart (V1, V2, V3)
3. Technical Vibration Analysis & Testing
4. Understanding Noise Grades (V vs Z)
5. Environmental Factors Affecting Vibration
6. Predictive Maintenance & Installation

Vibration Velocity Limit Chart (V1, V2, V3)

▸ Smart Search — Filter by bore size or application grade

BORE DIAMETER (MM)	V1 GRADE (STANDARD)			V2 GRADE (LOW NOISE)			V3 GRADE (SUPER SILENT)
BORE DIAMETER (MM)	LOW	MED	HIGH	LOW	MED	HIGH	LOW	MED	HIGH
5 – 6	90	60	50	58	36	33	35	21	18
7 – 9	110	80	65	72	48	40	44	28	24
10 – 12	140	100	85	90	60	50	55	35	30
15 – 17	180	130	100	115	75	60	70	45	36
20 – 25	230	160	130	150	100	80	90	60	48
28 – 32	290	210	170	190	130	100	115	75	60
35 – 40	380	260	210	240	160	130	150	100	80
45 – 50	480	330	260	300	200	160	190	130	100
55 – 60	600	420	340	380	260	210	240	160	130
65 – 70	750	520	420	480	330	260	300	200	160
75 – 100	1450	1000	800	950	650	520	600	420	340

* Vibration velocity limits in µm/s. Frequency bands: Low (unbalance), Med (waviness), High (roughness/dust).

Technical Vibration Analysis & Testing

To ensure 100% compliance with Bearing Vibration Standards, ZGBK utilizes high-precision transducers that measure velocity in micrometers per second (µm/s). The testing environment is strictly controlled to eliminate external interference. Vibration is analyzed across three critical frequency bands:

The Low Band: Detects unbalance.
The Medium Band: Detects raceway waviness.
The High Band: Detects surface roughness and dust contamination.

This thorough testing protocol is what allows us to guarantee the performance of our V2 and V3 silent series.

Understanding Noise Grades (V vs Z)

A common question in the industry involves the difference between V-Grade and Z-Grade. While both are part of Bearing Vibration Standards, they measure different physical properties.

V-Grade (V1, V2, V3): Measures vibration velocity, which is the best indicator of a bearing's overall structural integrity.

Z-Grade (Z1, Z2, Z3): Measures vibration acceleration in decibels (dB), which correlates more closely to the high-pitched audible noise humans hear.

For electric motors, both metrics are often used in tandem to ensure a premium, silent user experience.

Environmental Factors Affecting Vibration

Even the highest quality bearing following strict Bearing Vibration Standards can exhibit noise if environmental factors are not managed. Factors such as lubricant viscosity, ambient temperature, and external resonance from the machine housing can amplify vibration signals.

ZGBK recommends using high-purity synthetic greases for applications where noise reduction is the primary objective. Furthermore, ensuring that the bearing seat is machined to the correct tolerances will prevent deformation of the rings, which is a leading cause of vibration.

Predictive Maintenance & Installation

Maintaining Bearing Vibration Standards throughout the machine's life cycle requires a proactive approach. Predictive maintenance using handheld vibration pens or permanently mounted sensors allows engineers to detect early warning signs of wear. By comparing field data against our original Bearing Vibration Standards chart, maintenance teams can schedule replacements before a failure occurs.

Proper installation using induction heaters and precision alignment tools is also vital. A bearing that is "forced" onto a shaft will immediately lose its V3 rating due to internal stresses.

Acoustic Engineering

Need Total Silence?

Our laboratory can perform 100% vibration testing for your specific order, providing serialized noise reports for high-end motor applications.

Consult an Engineer View Catalog

Quality Assured

Silent Operation, Guaranteed.

✓ 100% Automated Noise Testing
✓ EMQ Grade Selection Experts
✓ ISO 15242 Testing Protocol

Talk to our Experts

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