Shaft Grounding: Products
The Industry’s Best Shaft Grounding Solution: Bearing Protection Kits (BPK)™
Premature bearing failure is a major cause of motor downtime and costly repairs. Helwig’s Bearing Protection Kit (BPK)™ Shaft Grounding Solution is the most effective, longest lasting way to divert VFD-induced electrical currents away from the bearings, preventing damage like arcing, fluting, pitting, burnt grease, and eventual failure.
Maintenance-free BPKs use a proprietary silver graphite brush and positive spring force for reliable motor shaft grounding (also known as shaft earthing outside of the U.S.). Our BPKs are economical, easy to install, and provide the industry’s best shaft grounding performance, outperforming carbon fiber rings. Stock and Custom Solutions available.
Benefits of Helwig Bearing Protection Kit (BPK)™ Shaft Grounding:
- Exceptional grounding for 10+ years in typical conditions
- Proven to protect motor bearings better than carbon fiber rings and other shaft grounding products by providing lowest resistance path to ground
- Effective at high frequencies and in contaminated environments
- One size fits many shaft diameters
- Maintenance-free
- Multiple installation options available, including EZ Multifit brackets to mount using existing motor bolts with no drilling or tapping
- Stock and custom solutions available
With Stock and Custom Solutions available, Helwig BPK Shaft Grounding protects motor bearings in a wide range of applications. Our experienced engineering team works directly with you to integrate shaft grounding seamlessly into new designs or existing products. We offer rapid prototyping for custom-engineered shaft grounding solutions, optimizing performance while keeping development timelines on track. OEMs rely on Helwig’s BPK™ Shaft Grounding for outstanding durability, consistent performance, and long-term reliability.
Upgrade Your Grounding Rings to Helwig Carbon’s BPK™ Technology
Bearing
Protection Kits (BPKs)™
BPK-Probe ™
Custom
Solutions
Explore Cutting-Edge Shaft Grounding Solutions
Bearing Protection Kit BPK-IM5
- Ideal shaft grounding system for small/medium size motors (shaft sizes 0”–2” or 0–50 mm)
- Features a brass holder with positive spring force and a proprietary silver graphite grounding brush
- Typical applications: HVAC, small- to medium-size pumps, fans, and internal mounts
- Perimeter or retaining bolt mounting options also available
Bearing Protection Kit BPK-SB
- Ideal shaft grounding system for contaminated environments and/or motors with shaft sizes 1.5”–4.5” (38–114 mm)
- Features a durable sealed brass holder with a constant force spring and proprietary silver graphite grounding brush
- Typical applications: motor OEMs, manufacturing, medical, steel, elevator, paper, and other contaminated environments
- Perimeter or retaining bolt mounting options also available
Bearing Protection Kit BPK-AM
- Ideal shaft grounding system for large motors (shaft sizes 4”–6.5” or 101–165 mm)
- Features a heavy-duty brass holder with a constant force spring and proprietary silver graphite grounding brush with a red top pad to reduce vibration
- Typical applications: large industrial, marine, and military
- Retaining bolt mounting option also available
Axially Mounted Shaft Grounding Kit
- Ideal shaft grounding system when it is not possible to install a BPK shaft grounding kit radially on the motor shaft
- Typically used for the non-drive end of the motor
- Typical applications: pitch motors, compressors, refrigerant motors, fan walls, and large HVAC units
- Standard and custom options available
- Perimeter or retaining bolt mounting options also available
Explore Additional Bearing Protection Kits
Bearing Protection Kit BPK-IM2
- Shaft grounding for small motors (shaft sizes 0”–1” or 0–25 mm)
- Features a brass holder with positive spring force and proprietary silver graphite grounding brush
- Typical applications: HVAC, small pumps, fans, and internal mounts
Bearing Protection Kit BPK-S
- Shaft grounding system for contaminated environments and/or motors with shaft sizes 1.5”–4.5” (38–114 mm)
- Features a sealed high-temperature-resistant plastic holder with a constant force spring and proprietary silver graphite grounding brush plus required grounding strap
- Typical applications: paper industry, foodservice, and other contaminated environments
Bearing Protection Kit BPK-4
- Shaft grounding system for medium-sized motors (shaft sizes 1.5”–4.5” or 38–114 mm)
- Features a durable brass holder with a constant force spring and proprietary silver graphite grounding brush
- Typical applications: manufacturing, medical, steel, and elevator
BPK Field Pack
- Variety pack that includes (6) BPK IM-5, (2) BPK-SB, (4) EZ-1 MultiFit Brackets for perimeter bolt mounting, and (4) EZ-3 MultiFit Brackets for retaining bolt mounting
- Ideal for motor shops and field installs
- In stock and ready to ship
Not Sure Which BPK™ & EZ MultiFit Bracket Are Right?
Contact Us or Explore Our EZ MultiFit Bracket Finder
Explore Our Shaft Voltage Detection Device
Find damaging discharges and determine risk.
Measure the performance of your grounding device.
Remote Testing options for confined, hard to access, or dangerous areas.
Complete kit includes everything you need to get started.
Request a Quote for a Custom-Engineered Solution
- Experienced engineering team works directly with you to seamlessly integrate shaft grounding into new designs or existing products
- Rapid prototyping capabilities
- Engineering, manufacturing, test lab, and R&D under one roof
- High-performance, cost-effective shaft grounding solutions developed within your project timeline
- OEMs rely on Helwig’s BPK™ Shaft Grounding for outstanding durability, consistent performance, and long-term reliability
Explore Shaft Grounding Resources
Learn how Helwig BPK Shaft Grounding products perform across a wide range of industries on our Applications page and access expert guidance on our Research and Literature page. You’ll find practical resources to help identify, select, and install BPK Shaft Grounding, learn how to test for damaging shaft voltage, and stay aligned with best practices.