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Bearing references by application

Koyo / JTEKT Bearings by Application: Matched to Your Part Number

Connect your Koyo and JTEKT references to a clear bearing request. Part Number Company is a Koyo / JTEKT bearing supplier serving industrial equipment, transmission, gearbox, heavy-duty, automotive aftermarket and repair buyers worldwide. Send the marking, packaging reference or equipment details and we quote by part number.

  • KOYO body marking
  • JTEKT packaging reference
  • REF equipment manual
Send Your Equipment Details → Find Your Application
Koyo and JTEKT roller and ball bearings laid out on a workbench beside industrial gearbox parts

2

brand names handled

Koyo or JTEKT, whichever is on your record

Choose your application

Each application below lists the Koyo / JTEKT bearing types buyers usually ask for, the common sourcing problems and what to include in your enquiry so we can quote in one pass.

Koyo or JTEKT

Quote by either brand name on your record

Part number first

Body marking, packaging label or manual reference

Checked before quote

Execution, complete assembly, alternatives

Global supply

Shipping terms stated in the written quote

General industrial machine with an exposed bearing housing on a factory floor

01 · Industrial equipment & general machinery

Replacement bearings for general machinery

Replacement buyers often hold a maintenance record that says Koyo while the purchasing system searches JTEKT. We handle both names and confirm the reference before quoting.

Common types

  • Deep groove ball
  • Tapered roller
  • Angular contact ball
  • Thrust ball

Sourcing problems

  • Koyo vs JTEKT name mismatch
  • Body marking differs from box label
  • Unsure which reference to order

Send us

  • Body marking and box reference
  • Equipment manual number
  • Quantity, country, postcode
View deep groove ball bearings →
Disassembled vehicle transmission showing tapered roller bearings on the shaft

02 · Transmissions & drivetrain

Clearly identified drivetrain bearings

You can enquire about clearly identified transmission parts as well as general equipment bearings. Old references are often superseded, so we confirm the current reference and whether you need a complete assembly.

Common types

  • Tapered roller
  • Cylindrical roller
  • Needle roller

Sourcing problems

  • Superseded part numbers
  • Assembly vs single component
  • Execution variations

Send us

  • Old and current markings
  • Equipment or vehicle details
  • Whether alternatives are acceptable
View tapered roller bearings →
Open industrial gearbox with shafts and cylindrical roller bearings in place

03 · Gearboxes & shaft applications

Shaft and gearbox bearings, execution confirmed

Gearbox lists usually mix several bearing types. We confirm the exact execution of each line before quoting, and any technical change needs your approval.

Common types

  • Cylindrical roller
  • Tapered roller
  • Angular contact ball

Sourcing problems

  • Mixed multi-type lists
  • Repeated back-and-forth
  • Unclear quote terms

Send us

  • Full reference list with quantities
  • Gearbox or equipment details
  • Required delivery date
View cylindrical roller bearings →
Large spherical roller bearing being fitted into heavy-duty machinery

04 · Heavy-duty assembly machinery

Heavy-duty bearings for long-term spares planning

For heavy-duty machinery, the risk is a reference that is close to end-of-life. Where we can identify it, we flag it and point to the replacement series so you can plan spares.

Common types

  • Spherical roller
  • Tapered roller
  • Cylindrical roller

Sourcing problems

  • End-of-life references
  • Long-term spares planning
  • Worn or unreadable markings

Send us

  • Marking or clear photos
  • Machine identification
  • Planned annual quantity
View spherical roller bearings →
Technician removing a needle roller bearing from a compact machine mechanism

05 · Specialized machinery repair

Bearings for repair work on specialized machinery

Repair work often starts with a used bearing and little documentation. A clear photo plus measured dimensions is often enough to start identification.

Common types

  • Needle roller
  • Deep groove ball
  • Thrust ball

Sourcing problems

  • Partially worn part numbers
  • No manual available
  • Compact, hard-to-measure parts

Send us

  • Clear photos of the bearing
  • Measured dimensions
  • Machine type and quantity
View needle roller bearings →

Have a mixed list from several machines?

Send the full Koyo / JTEKT reference list and get one written quote that covers every line.

Send Your Reference List →

06 · Automotive aftermarket

Automotive bearing references need vehicle or equipment identification

We can only quote application-specific automotive bearing references once fitment is confirmed. If you send the vehicle or equipment details with the bearing marking, we can check fitment before we quote, not after delivery.

Mechanic holding a wheel hub bearing next to a raised vehicle in a service bay

Fitment checklist for your enquiry

  1. 01Koyo / JTEKT markingEverything legible on the bearing body
  2. 02Packaging referenceBox label number, even if it differs from the body
  3. 03Vehicle or equipment identificationThe identification details from the vehicle or equipment record
  4. 04Complete assembly or componentSay which one you need replaced
  5. 05Alternative reference acceptanceSay whether a separately marked alternative is acceptable
  6. 06Quantity and deliveryDestination country, postcode and required delivery date
Send Vehicle Details →
Workshop technician measuring a worn bearing with a caliper on a repair bench

Repair workshops: worn part number? Send a photo and dimensions

If the part number on a Koyo bearing is partly worn, send clear photos of every remaining mark plus the measured bore, outside diameter and width. We use these to identify the correct reference before quoting.

  • PhotoAll faces with remaining marks
  • DimensionsBore, outside diameter, width
  • EquipmentMachine where it was fitted
"We had a Koyo bearing on a piece of equipment where the part number was partially worn. We sent a photo and the dimensions, and they identified the correct Koyo reference. The bearing arrived and fit perfectly. Good identification support."
Jorge Ramirez · Talleres Ramirez, Mexico

Distributors and industrial suppliers: one quote for a mixed list

Bearing distributors and industrial suppliers can send Koyo and JTEKT part numbers straight from their stock list. We match each line, confirm execution variations and quote in one response. Where we can identify references nearing end-of-life, we flag them and suggest the replacement series.

Warehouse shelves stacked with boxed bearings ready for distributor orders

Mixed list · one response

"We send Koyo and JTEKT part numbers straight from our stock list. This supplier matches them exactly, confirms any execution variations, and quotes in one response. Our buyer spends less time following up and more time on higher-value work."
David MartinezMartinez Industrial Supply, USA (CA)

End-of-life notice

"Pricing on a mixed list of Koyo and JTEKT part numbers was competitive. The supplier flagged two references that were approaching end-of-life and suggested the replacement series. That kind of proactive notice is valuable for long-term planning."
Klaus WeberWeber Industrieteile, Austria
Replacement bearing seated in a transmission housing on a service bench

Transmission systems: from a superseded Koyo number to the current JTEKT reference

If an old Koyo part number has been superseded, send it with any packaging reference and the equipment details. Where a current JTEKT replacement exists, we identify it and share the interchange details. Any technical change is put to you for approval before you order.

  1. 1Send the old Koyo reference as recorded
  2. 2We identify the current JTEKT reference and interchange details
  3. 3You approve the change, then receive a written quote
"When we had a Koyo bearing with a part number that had been superseded, they identified the current JTEKT replacement and the interchange details. We ordered the new reference and it dropped into the same housing. No modification needed."
Yuki Tanaka · Tanaka Precision Parts, Japan

Related Koyo / JTEKT bearing categories

You can buy ball, tapered, cylindrical, spherical and needle roller bearings across both brand names and send them on one request.

Browse all bearing categories →

Who provides what: role matrix for bearing enquiries

A quote goes fastest when each person on your side sends the details they already hold. The table shows what each role usually provides and what they confirm before ordering.

Role Provides in the enquiry Confirms before ordering
Parts identification specialist Koyo / JTEKT body markings, packaging references, old and superseded numbers, photos and dimensions Legacy marking matches the current reference; execution; separately marked alternatives
Aftermarket purchasing manager Application, required parts, quantities, destination country and postcode, delivery date Reference, quantity, price and currency, availability, lead time, quote validity, shipping and tax terms, payment
Workshop service manager Equipment or vehicle identification, where the bearing was fitted, condition of the removed part Fitment for the vehicle or equipment; complete assembly or component; label, quantity and condition on receipt

Application enquiry FAQ

Short answers to questions buyers ask before sending a Koyo / JTEKT request.

My record says Koyo but the box says JTEKT. What should I send?+

Send both: the marking on the bearing body and the reference on the packaging label, plus a clear photo. We handle enquiries under either brand name and confirm which reference applies before quoting. Add the equipment manual number if you have it.

What extra details are needed for automotive or specialized parts?+

Add the vehicle or equipment identification to the bearing marking. Say whether you need a complete assembly and whether a separately marked alternative is acceptable. Without this we cannot confirm fitment, so we will ask for it before quoting.

What does the written quote include?+

The written quote states the product reference, quantity, price and currency, availability, estimated lead time, quote validity and the shipping and tax terms that apply. Ask us which product documents we can supply for your order.

Send your equipment details for a written quote

To get a written quote from Part Number Company, send your Koyo / JTEKT markings, packaging references and equipment or vehicle details. If anything is missing, we ask for it before we quote.

Purchasing manager reviewing boxed bearings and a removed part at a workshop desk

Send Your Equipment Details

Four fields. Put every reference in the requirements box.