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Tapered roller bearings and ball bearings laid out on a steel workbench next to a caliper

Help Center · Part Number Company

Koyo / JTEKT Part Number Enquiry FAQ

Answers for parts identification specialists, aftermarket buyers and workshop managers who need to connect a Koyo or JTEKT marking, packaging reference or equipment detail to a clear written quote from a Koyo / JTEKT bearing supplier.

KOYO marking JTEKT reference VEHICLE / equipment ID

Most asked: identifying the right Koyo / JTEKT bearing

Send every marking and identification detail you have in your first message. The more references we can compare, the faster we can match the part and quote it in writing.

Close-up of the laser-etched marking on the outer ring of a used roller bearing

Pinned · Brands & Markings

Which markings should I send when the brand labels don't match?

Send all of them. Your records may say Koyo while your buyer searches JTEKT, and the bearing body and packaging may show different information, so we compare every reference before quoting.

  • Every Koyo or JTEKT marking on the bearing body
  • Packaging reference numbers from the box or label
  • References from the equipment manual or service records
  • Clear photos, plus dimensions if the marking is worn
Mechanic in a vehicle workshop removing a wheel hub bearing from a car axle

Pinned · Automotive & Special Parts

What extra information do automotive or special parts need?

Application-specific automotive bearing references need vehicle or equipment identification details alongside the part number. Without them, fitment cannot be confirmed.

  • Vehicle or equipment identification information
  • Any Koyo / JTEKT marking or packaging reference
  • Whether you need a complete assembly or a single part
  • Quantity, destination country and postcode, required date

01 · Brands & Markings

Koyo and JTEKT markings, labels and part numbers

Part Number Company handles enquiries under both brand names, so start with whatever reference your records or old part show.

My records say Koyo but my buyer searches JTEKT. Is it the same part?

Send us the reference as written and we will check it. We focus on Koyo and JTEKT and handle enquiries under either name, so we compare your marking, packaging reference and application details before quoting. Any difference in execution is confirmed with you first.

The bearing marking and the packaging label differ. Which one do I order by?

Don't choose one yourself. Send both. We review the body marking and the packaging reference together and confirm the exact specification before you accept a quote.

The part number on my bearing is worn and hard to read. What can I do?

Send clear photos of the bearing and its measured dimensions. Add any readable characters, the packaging or the equipment manual reference. We use these to identify the Koyo / JTEKT reference and confirm it with you before quoting.

My old part number has been superseded. How do I find the current one?

Send the superseded reference and we will identify the current replacement. Any alternative reference is shown separately in the quote, and you decide whether to accept it. Any technical change needs your approval.

Specialist measuring the bore of a cylindrical roller bearing with a digital caliper at an inspection bench
“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.”

Yuki Tanaka · Tanaka Precision Parts, Japan

02 · Automotive & Special Parts

Automotive and special machinery bearing enquiries

Application-specific parts are quoted with your vehicle or equipment details, not just a part number.

Which vehicle or equipment details do you need?

Send the vehicle or equipment identification information along with every Koyo / JTEKT marking and packaging reference you have. Also tell us if you need a complete assembly, plus quantity, destination country and postcode, and required date.

My information is incomplete. How do you confirm the part fits?

We ask you for the missing details before we quote. That means confirming the exact execution, whether it is a complete assembly, and whether you accept a separately marked alternative. Photos and dimensions of the old part help when vehicle data is limited.

03 · Quotes & Terms

What a written bearing quote includes

Every quote is in writing, so your team can check it without going back and forth.

Quote itemWhat it tells you
Product referenceThe exact Koyo / JTEKT reference being quoted
Quantity · Price · CurrencyCommercial basis of the offer
Stock · Lead timeStock position and estimated delivery time
ValidityHow long the quote stays valid
Shipping · Tax termsShipping and tax terms that apply
What does the written quote include?

It lists the product reference, quantity, price and currency, stock position, estimated lead time, quote validity, and the shipping and tax terms that apply. You can also ask which product documentation we can supply for that order.

How long is a quote valid?

Each written quote states its own validity period. Check that date when you review the quote, and confirm before ordering if it has passed.

How are alternative or replacement references shown?

Alternatives are always marked separately from the reference you asked for. Before you accept the quote, we confirm whether you will take a separately marked alternative, so nothing is substituted without your knowledge.

Can a technical change be made without my approval?

No. Any technical change must be approved by the buyer. We raise differences in execution, assembly or reference before quoting so you can decide.

Have a mixed Koyo / JTEKT list?

Send every reference in one message and get a single written quote.

Send Your Part List

04 · Ordering & Delivery

Ordering, shipping and documents

You confirm the specification and commercial terms before ordering, then the shipping details before dispatch.

Which terms should I confirm before placing an order?

Check the specification, quantity, delivery details, payment method and commercial terms against the quote before you order.

How are shipping method and shipping documents agreed?

We confirm the shipping method, dispatch timing and shipping documents for each order with you. Tell us in your enquiry which documents your import or customer process needs.

Which product documentation can you supply?

It depends on the order, so ask when you request a quote. We will tell you which documents we can actually supply for those references before you commit.

05 · Receiving Goods

Checking your bearings on arrival

Check labels, quantity and condition when the goods arrive, and report any issue with your order number and photos.

Warehouse worker opening a carton of boxed bearings on a receiving table
What should I check when the bearings arrive?

Check the product labels against your order, count the quantity, and inspect the outer condition of the packaging and bearings.

Something doesn't match. How do I report it?

Contact us with your order number and photos of the labels, packaging or bearing. Send them by WhatsApp at +1(740)407 or email info@koyojtekt.com so we can review the case.

Send your Koyo / JTEKT part number for a written quote

Share the references you have. Part Number Company, a Koyo / JTEKT bearing supplier serving buyers worldwide, will confirm identification details and then send a written quote.

  1. 01

    Send references. Send all markings, packaging references, and vehicle or equipment details.

  2. 02

    Confirm identification. Confirm execution, assembly and whether you accept alternatives.

  3. 03

    Review the quote. Check reference, price, stock, lead time, validity and terms.

Boxed bearings stacked on a pallet ready for dispatch in a warehouse

Prefer chat? Message us on WhatsApp at +1(740)407.