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Representative image of an RCScrewZ metal-shielded bearing kit for Kyosho Caliber 5 Nitro RC Helicopter (21250); exact bearing sizes and quantities vary by RC model.
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Infographic reminder: Refer to the item description for more detailed information about the product - kyo064b
Notice: Check the product description for detailed information on the specific bearing sizes included in this bearing kit - kyo064b

Why Choose This Kit

Key features and intended use for this kit.

Shield type

Metal-Shielded (On-Road)

Performance focus

Low-drag, not sealed

Best suited for

Clean operating conditions

Metal-Shielded Bearings45+ Pieces

RCScrewZ Metal Shielded Bearing Kit kyo064b for Kyosho Caliber 5 Nitro RC Helicopter (21250) | SET

RCScrewZSKU: kyo064b

Model-specific metal-shielded bearings for smooth, low-drag rotation in this RC helicopter, intended for clean operating conditions.

Fits: Kyosho Caliber 5 Nitro RC Helicopter (21250)
OEM / model: 21250

US
Regular price
$69.88
Sale price
$69.88
Regular price
$79.95

In stock

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Confirm this kit fits your RCMatch the RC model and OEM/model number shown above to your vehicle.

Exact model check

Confirm This Fits Your RC

Match the RC model and OEM/model number below before ordering.

RC model
Kyosho Caliber 5 Nitro RC Helicopter (21250)
OEM / model number
21250
Kit type
Metal-Shielded Bearing Kit — Low-Drag for Cleaner Running
Piece count
45+ Pieces
Scale
1:10
Power
Nitro & Glow Fuel
View all verified kits for this model →
More compatibility details
RC brand
Kyosho
Vehicle class
Helicopter
Kit SKU
kyo064b
Model series
Caliber, Caliber 5
Product information

Everything You Need Before Ordering

Review what is included, installation notes, shipping details, and complete kit information.

Kit Contents & Installation

What’s Included Model-specific bearing set with one spare of each included size.
  • All bearing sizes listed below for this model-specific kit
  • One spare of each included size
  • Bearing styles vary by RC model and may include standard, flanged, one-way, or thrust bearings

Included bearing sizes for this kit:

    • 3mm x 7mm x 3mm bearings +(1) extra
    • 5mm x 10mm x 4mm bearings +(1) extra
    • 6mm x 10mm x 3mm bearings +(1) extra
    • 6mm x 12mm x 4.5mm thrust bearings
    • 6mm x 13mm x 5mm bearings +(1) extra
    • 8mm x 16mm x 5mm bearings +(1) extra
    • 10mm x 19mm x 5mm bearings +(1) extra
Installation & Model NotesImportant instructions and model-specific guidance.

Seat bearings fully and squarely. Do not force them into the housing or overtighten the hardware that retains them.

Keep metal-shielded bearings clean and dry.

After cleaning and drying, apply a small amount of light bearing oil.

Details & Support

Kit Details Lower-drag metal shields for clean, dry running conditions.
Shield Type
Metal-Shielded Bearings
Performance Priority
Lower drag
Protection
Not sealed; best kept clean and dry
Best For
Cleaner on-road or prepared surfaces when lower drag is the priority
Not Ideal For
Dust, dirt, sand, mud, water, or frequent wet-condition use
Shipping & Returns Handling time, current delivery estimate, and return policy.
Free shipping on all U.S. orders (USPS Priority Mail).
Ships within 1–2 business days (Mon–Fri); some Saturday shipments by 12:00 PM ET.
Most orders ship from Canton, MI 48187. APO/FPO/DPO & PO Boxes welcome.
Priority Mail typically delivers in 2–3 business days (estimates; not guaranteed).
Easy 30-day returns with prepaid USPS label; refunds issued within 3 business days after the return is received.

Over 99% positive over ~14,000 orders on eBay (last 12 months) — as of October 2025. View on eBay

Full Product Description Read the complete product specifications and details.

Exact RC Model Fitment

Confirm the exact RC model and RC vehicle OEM/model number below before ordering.

Compatible RC Model
Kyosho Caliber 5 Nitro RC Helicopter (21250)
Compatible RC Brand
Kyosho
RC Vehicle OEM / Model Number(s)
21250
RCScrewZ Kit Part Number
kyo064b

Vehicle Compatibility Details

Review these vehicle details to help confirm compatibility with your RC model.

RC Vehicle OEM / Model Number(s)
21250
RC Chassis Compatibility
Kyosho Caliber 5 helicopter (21250)
Compatible Vehicle Type
Nitro RC Helicopter
Terrain Compatibility
Compatible Scale
1:10
Compatible Fuel Type
Nitro & Glow Fuel

What Is Included

Included bearing sizes for this Metal-Shielded Bearing Kit:

    • 3mm x 7mm x 3mm bearings +(1) extra
    • 5mm x 10mm x 4mm bearings +(1) extra
    • 6mm x 10mm x 3mm bearings +(1) extra
    • 6mm x 12mm x 4.5mm thrust bearings
    • 6mm x 13mm x 5mm bearings +(1) extra
    • 8mm x 16mm x 5mm bearings +(1) extra
    • 10mm x 19mm x 5mm bearings +(1) extra

What Is Not Included

Only the bearings identified in the included-bearing-size list are part of this kit. 

The RC vehicle and separately sold parts are not included unless specifically listed.

Installation & Model Notes

Metal Shielded Bearing Kit Compatibility:

Quick Fit Summary:

  • Compatible Brand: Kyosho

  • Fit: Model-specific fitment for Kyosho Caliber 5 Nitro RC Helicopter, OEM/model code 21250.

  • Compatible RC Model/OEM Numbers: 21250

  • Scale: Not currently verified

  • Power Source / Fuel Type: Nitro & Glow Fuel

  • Battery / Cell Count: Not applicable - nitro powered.

  • Drive Type: Rotor-driven helicopter

  • Vehicle Type: Nitro RC Helicopter

  • Chassis: Kyosho Caliber 5 helicopter (21250)

  • Era: Not currently verified

  • OEM / Models: 21250

  • RC Model Terrain: Aerial Use

This Kit Details:

  • SKU: kyo064b

  • MPN: kyo064b

  • Kit Type: Metal Shielded Bearing Kit

  • Bearing Kit Piece Count: 45+ Pieces

  • Bearing Type: Metal-Shielded Bearings (On-Road / Low-Drag)

  • Sealed Bearings: No

  • Water/Dust Protection: Low-drag, not sealed

  • Product Material: Carbon Chrome Steel Bearings

  • Product Color: Silver

Bearing Size Details:

  • 3x7x3mm bearings
  • 5x10x4mm bearings
  • 6x10x3mm bearings
  • 6x12x4.5mm thrust bearings
  • 6x13x5mm bearings
  • 8x16x5mm bearings
  • 10x19x5mm bearings

OEM / Model Code / Alias Coverage:

  • 21250

Model Family Coverage: Caliber, Caliber 5

Product Benefits:

  • Metal shielded bearings are tuned for low drag and smooth drivetrain feel in cleaner running conditions.
  • Best for clean-surface use, race-prep, display builds, or buyers who prefer reduced rolling resistance.

Fitment Note: Confirm your Kyosho OEM/model number before ordering. Bearing sizes are included only where source-backed; otherwise they remain marked as not currently verified.

Search-Friendly Notes: Compatible Kyosho Caliber 5 parts for RC maintenance, rebuilds, restoration, and model-specific fitment lookup.

Metal-Shielded Bearing Kit Details

Review the bearing-kit details below before ordering.

RCScrewZ Kit Part Number
kyo064b
Product Brand
RCScrewZ
Shielding Type
Metal-Shielded (On-Road)
Sealed Bearing Status
No
Bearing Material
Carbon Chrome Bearings
Approximate Piece Count
45+ Pieces
Color
Silver

Before Ordering

  • Confirm your exact RC model, RC brand, and OEM/model number whenever possible.
  • Review the included-bearing-size list before purchase.
  • Read the installation and model notes before disassembly or installation.

Vehicle versions, chassis revisions, and model-year configurations can differ. 

Confirm fitment before purchase when your RC vehicle differs from the details shown above.

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Fits: Kyosho Caliber 5 Nitro RC Helicopter (21250)
$69.88