UC200 Series Insert Bearings (JIS B 1558 / ISO 9628) are insert bearings & housed units. The full size table is below, followed by the material and cage options, how the bearing is located on the shaft and in the housing, and where the type is and is not the right choice.
What Are UC200 Series Insert Bearings?
UC200 Series Insert Bearings are insert bearings & housed units defined by JIS B 1558 / ISO 9628. They are selected by bearing designation and the dimensional characteristics shown below. Material, cage and sealing are specified separately from the designation and are covered further down this page.
Materials & Cage
The insert bearing is through-hardened GCr15 / 100Cr6 with a spherical outer ring. The housing is a separate material decision: grey cast iron for general industrial duty, ductile iron where shock is expected, pressed steel for light duty and low mass, thermoplastic or 304 stainless for washdown and food service. Seals are normally nitrile; specify FKM above 100 degrees C.
Typical Applications
Conveyors, agricultural equipment, fans and general OEM machinery, bolted straight to a frame with no machined housing bore. Read the full application guide for UC200 Series Insert Bearings →
Pricing
UC200 Series Insert Bearings are supplied to order. Pricing starts from approximately US$3.50 per piece for standard shaft sizes with a grey cast iron housing and setscrew locking; final pricing depends on size, material, finish and order quantity (MOQ applies). Submit your exact configuration with the quote form above.
Specifying the UC200 Series Insert Bearings
The sizes specified most often from this range are 17 mm bore, 20 mm bore, 25 mm bore and 30 mm bore. Each has its own page, so a drawing can be checked against one bore without reading the whole table above.
Where the environment decides the specification rather than the load, the material pages are the ones to read: Martensitic Stainless 440C, Cast Iron and Pressed Steel Cage. Each states what the grade survives, and what choosing it costs in load capacity or temperature range.
For the machines and duties this type is actually specified for, see where uc200 series insert bearings are fitted.
Manufactured in our own plant
This bearing is forged, hardened, ground, superfinished and clearance-set in-house. The stages below are where its tolerance class, its internal clearance and its noise grade are actually decided.
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01 Forging & turning
GCr15 bar and tube is cut, heated and forged into ring blanks, then turned to leave a uniform grinding allowance. Forging rather than machining from solid keeps the grain flow following the raceway, which is the surface that eventually fails.
Blank dimensions and grinding stock checked at set-up and per shift.
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02 Heat treatment
Through-hardening brings GCr15 / 100Cr6 to 58–64 HRC; carburizing case-hardens 20CrMnTi where the section is heavy or the load is shock. Rings are then stabilized so they hold size in service rather than growing in the housing.
Core and surface hardness per lot; retained austenite and dimensional stability to the ordered temperature class.
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03 Raceway grinding
Faces, bore, outer diameter and raceway are ground in sequence on separate machines. This is where the tolerance class is created: P0, P6, P5 or P4 is a grinding outcome, not a sorting outcome.
Bore and outer diameter deviation, raceway roundness and face runout measured to ISO 492 on every setup.
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04 Honing & superfinishing
The ground raceway is honed to remove the grinding lay and bring surface roughness down to a fraction of a micrometre. Raceway finish is what decides whether a lubricant film forms, and therefore what decides bearing life far more than the load rating alone.
Surface roughness Ra and waviness measured per lot.