NSK bearing supply · Quote by complete part number
NSK bearing FAQ · NSK Bearings: Source Factory Direct Sales
NSK Bearings: Source Factory Direct Sales is an authorized NSK supply source for spindle rebuild shops, CNC retrofit teams, machine tool rebuilders and distributor buyers. These answers explain what we need from you — complete part number, bearing position, exact execution — so the quote matches your machine specification, not a guess.
Most asked
Short answers here; full detail in the categories below.
Send the short code together with the machine model and bearing position. A short code often hides the seal and clearance; we confirm the complete NSK part number with you before quoting, so you do not receive the wrong execution.
Read part number answers →Yes — when the part number is incomplete, clear photos of the markings on the old bearing help us confirm the correct NSK precision reference. Shoot the ring faces straight on, in good light, and add the machine model.
Send a marking photo →We provide authorized NSK supply: genuine bearings in original NSK packaging with documentation. The documents available for your specific order are confirmed in the written quote, so you know before you order what will pass your incoming inspection.
Read document answers →01 · Part number & identification
Two NSK bearings with identical bore, OD and width can differ in seal, clearance, cage and tolerance class — so we quote from the complete part number, not from dimensions alone.
The full suffix is everything after the basic bearing number, and it defines the exact execution. It carries the seal or shield type, internal clearance, precision class and, on spindle bearings, the arrangement and preload. Without it, a quote is only a size match.
Yes, but we will first fill in the missing identification with you. Abbreviated codes usually drop the original seal and clearance, which is how wrong structures get ordered. Send the code, the machine model and the bearing position; if the old bearing is available, add photos of its markings.
Yes. Deep groove ball bearings are specified as open, shielded or sealed, and each behaves differently for lubrication, contamination and friction. If the original was sealed and an open bearing is fitted, the lubrication arrangement of the position no longer matches.
Internal clearance sets how the bearing runs once fitted and at operating temperature; precision class sets dimensional and running tolerances. On spindles and high-speed positions, the wrong class or clearance shows up as runout, heat or noise. We match both to the original specification, or flag the difference for your approval.
Because machine specifications often call for a special structure that dimensions cannot show. Contact angle, cage material, seal design and tolerance class are invisible in a bore × OD × width match. We ask about the application — speed, preload, lubrication — before confirming the NSK series.
"As a precision machinery maintenance buyer, I value suppliers who do not guess. They asked about speed, preload and lubrication before confirming the NSK series."
02 · Matched sets & preload
Precision spindles and ball screw supports rely on matched bearing sets with a defined arrangement and preload; replacing one bearing alone can miss the runout or positioning accuracy the machine was built to hold.
Usually not, if the bearings were installed as a matched set. Matched sets are produced so that the bearings share load and preload evenly; mixing one new bearing with used ones changes that balance. We recommend quoting the complete set for the position.
The same principle applies: the support bearings define the axial stiffness that keeps the axis on position. Tell us the machine, the axis and the current arrangement, and we confirm the correct execution before quoting.
We confirm the matching set and preload arrangement against your specification before the order ships. Send the arrangement on the old set (back-to-back, face-to-face or tandem, if known), the preload designation and the bearing count per position. Any deviation is raised with you first, never substituted silently.
Yes. Super-precision series and machine tool bearing series can be sourced in one enquiry, alongside the general bearings used on the same equipment. List them per position so each line is quoted to its own specification.
"They confirm the matching set and preload arrangement before dispatch, and every spindle we have rebuilt has met the runout specification."
03 · Positions & quantities
List each bearing by machine and position — drive end, non-drive end, spindle front, spindle rear, axis support — with its own quantity, so the quote cannot mix positions or totals.
| Column | What to write |
|---|---|
| Machine | Equipment model the bearing comes from |
| Position | Drive end / non-drive end, spindle front / rear, axis support |
| Part number | Complete NSK number with full suffix |
| Accessories | Adapter sleeve or housing model, if used |
| Quantity | Per position, not one combined total |
Split it into one line per position, each with its own part number and quantity. Drive-end and non-drive-end bearings are frequently different types or executions, and a merged line is the most common cause of wrong quantities or wrong installation positions.
Yes. Before quoting we confirm with you whether the assembly is complete — bearings, adapter sleeves or housings listed for each position — so the parts arrive together for the planned shutdown.
Send your previous list with line quantities and we compare each repeat part number against it. Distributor buyers and maintenance teams with long-term spares needs get a direct contact for repair quantities and maintenance lists.
04 · Genuine supply & documents
NSK Bearings: Source Factory Direct Sales provides authorized NSK supply: genuine NSK bearings in original packaging with documentation, and the documents available for each order are confirmed in writing in the quote.
Yes. We are an authorized NSK supply source, and the NSK bearings we supply are genuine, in original NSK packaging, with documentation. That is what lets your quality team pass incoming inspection.
The documents actually available for your order are stated in the written quote. Tell us at enquiry stage what your incoming inspection requires — certificates, measurement report, shipping documents — and we confirm what can be provided before you place the order.
Ask for it in your enquiry and we confirm availability in the quote. Customers rebuilding spindles and retrofitting CNC axes have used the measurement report to verify internal clearance and fit on arrival.
"Genuine NSK packaging and full documentation. Our quality inspection passed on first sample."
05 · Quotes & ordering
Every written quote states part number, quantity, price and currency, stock status, estimated lead time, validity, applicable shipping or tax terms, and the documents we can actually provide.
The more of this you send, the faster the quote:
Part number, quantity, price and currency, stock status, estimated lead time and quote validity. It also states the applicable shipping or tax terms and confirms which product documents can be provided, so your purchasing engineer can check everything in one place.
No. Any alternative is listed separately and clearly marked in the quote, and every technical change requires the buyer's approval. If you can accept an approved alternative, tell us in the enquiry.
Review the quote, confirm specification, quantities, delivery details, payment method and commercial terms, then place the order. Questions on any line can be resolved on WhatsApp or by email before you commit.
Have your list ready? Send it as it is — we will fill the gaps with you.
Send Your Model List →06 · Shipping & receiving
Shipping method, dispatch timing and the shipping documents your order needs are confirmed after you order; on arrival, check labels, quantities and appearance, and report any mismatch with your order number and photos.
They are confirmed per order. We agree the shipping method, dispatch timing and the shipping documents required for your destination before the goods leave, so customs paperwork matches what your receiving team expects.
Check the product labels against the order lines, count quantities per position, and inspect packaging and bearing appearance. Do this before installation so any issue is raised while the machine is still scheduled for its rebuild.
Contact us with your order number and clear photos of the labels, packaging and the item in question. Send them on WhatsApp at +86 152 691 88020 or by email to info@jpnsk.com, and we handle it from there.
Still unsure?
A clear photo of the old bearing, the machine model and the position is often enough for NSK Bearings: Source Factory Direct Sales to confirm the correct NSK reference and start the quote.
Part numbers, positions and quantities go in the requirements box.
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