Description
Authorized Channel Sourcing — Every INA BK0910 we dispatch ships with batch-linked documentation traceable back through the authorized distributor network, not an unverified trading desk.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | INA BK0910 |
| Bearing Type | Closed End Needle Roller Bearing |
| Bore Diameter (d) | 9 mm |
| Outside Diameter (D) | 13 mm |
| Width (B) | 10 mm |
| Series | Bk Series |
| Cup Style | Drawn Cup, Closed End |
| Material | Bearing Steel |
| Precision Class | P6 |
| Seal or Shield Type | Closed End (Integral) |
| Standard | ISO 3245 / DIN 618-1 |
| Origin | Manufacturer production facilities |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Automotive & Heavy Vehicle Repair | Manual transmission input shaft support, transfer case needle pockets |
| Industrial Machinery | Compact gearbox pilot bearings, cam-follower support in packaging equipment |
| General MRO | Power tool spindle needle bushings, agricultural PTO shaft ends |
| Electric Motors | High-speed rotor shaft support where radial envelope is limited |
Why a Soft Cup Wrecks a Transmission Rebuild
Heat treatment shortcuts on the drawn cup turn a precision bearing into a field failure waiting to happen.
When a middleman substitutes an INA BK0910 closed end needle roller bearing with an unverified copy, the cup wall often measures right but carries a softer core from skipped carbonitriding passes. The needles score first, then the cup deforms under radial load, and the gearbox comes apart within weeks. Shops that rebuild automotive transmissions see this pattern repeatedly — dimensional accuracy on paper, metallurgical failure in the housing [NEED_CITE: premature bearing failure modes in remanufactured transmissions]. The cost isn’t just the bearing; it’s the labor tearing down a transmission a second time.
Fitting the Compact Envelope of a Transmission Shaft Pocket
The drawn cup outer ring gives the INA BK0910 closed end needle roller bearing a minimal radial cross-section, so it drops directly into a machined housing bore without a separate outer ring seat. In transmission rebuilds where the shaft pocket depth is fixed by the casting, this matters — a thicker alternative simply won’t seat. We’ve supplied matched batches for shops rebuilding light-duty commercial gearboxes where the closed end blocks contaminant ingress from the blind side of the housing, removing the need for an extra seal plate.
Load Direction, Speed, and Contamination Risks
Pure radial loads dominate in transmission needle pockets, with occasional shock from gear engagement. The high-speed transmission environment demands needles that maintain surface integrity above moderate rpm thresholds, where lubricant film thickness narrows. Temperature stays moderate in most gearbox applications, but heat from adjacent friction clutches can raise local oil temperature, thinning the film further. The closed end of the INA BK0910 keeps out metallic debris circulating in shared sump oil — an open-end substitute would let that debris migrate past the needle complement [NEED_CITE: contamination impact on needle roller bearing fatigue life per ISO 281].
What the Closed End and P6 Precision Actually Deliver
The closed end is not merely a dust cap; it functions as an integral thrust face for needle retention and a barrier against axial contaminant migration. Combined with the drawn cup geometry, this produces a bearing that handles radial loads within its compact footprint while sealing one side without added hardware. The P6 precision class controls bore and cup OD tolerances tightly enough for transmission shaft fits where runout directly affects gear mesh noise. Bearing steel construction in both the cup and needles provides the surface hardness needed for rolling contact fatigue resistance under repeated gear-shift shock loads. The 9 mm bore, 13 mm OD, and 10 mm width define a bearing that fits spaces where even slim ball bearings cannot.
What a Wrong Source Costs Beyond the Part Number
A counterfeit INA BK0910 may pass a caliper check yet carry needles with subsurface softness that triggers spalling under normal transmission loads. The downstream cost — unplanned downtime, warranty disputes with the vehicle owner, and reputation damage for the repair shop — dwarfs any per-unit savings. ISO 15243 classifies these failures under subsurface fatigue and surface wear, both accelerated when material integrity is compromised [NEED_CITE: rolling bearing failure mode classification per ISO 15243]. Sourcing through verified channels with full batch traceability is the only defense that holds up when a teardown photo lands on a warranty claim desk.
How We Source What a Shop Actually Needs
Our authorized distributor channels provide each INA BK0910 with a Certificate of Conformity tied to a specific production batch, so the paper trail reaches back to the manufacturing lot. We run hardness spot-checks on incoming needle bearing batches because heat treatment quality is invisible to visual inspection. For shops converting from a different brand, our cross-reference matching verifies bore, OD, width, and precision class simultaneously — not just the base designation. Origin documentation arrives with every shipment to smooth import clearance. When a rebuild requires twenty units of one size, we pull from traceable stock rather than consolidating from unknown resellers.
Documentation & Authenticity
- Supplier Certificate of Conformity referencing the specific INA BK0910 batch and production date code
- QR code verification pathway through the INA official app to confirm authenticity before the bearing leaves your receiving dock
- Hardness spot-check records on needle rollers and drawn cup wall, confirming heat treatment compliance
- Third-party dimensional inspection covering bore, cup OD, and closed-end depth tolerances
- Country-of-origin documentation and HS code classification ready for import filing
- Material certificate confirming bearing steel grade for the cup and needle elements
Storage, Handling & Mounting
- Keep the INA BK0910 sealed in its original anti-corrosion packaging until the transmission housing is prepped — the drawn cup surface corrodes quickly once the factory oil film degrades
- Store closed end bearings cup-down on a clean surface to prevent dust accumulation on the open needle face
- Press-fit using a sleeve that contacts only the cup outer diameter; loading through the needles or the closed end will collapse the drawn cup
- Confirm housing bore roundness before installation — a distorted bore in a worn transmission case will ovalize the thin cup and bind the needles
- Apply the specified transmission oil or grease to the needle complement immediately after press-fit, before the first shaft rotation
Requesting a Quotation That Matches Your Rebuild Schedule
Share the transmission model or OEM equipment number so we can cross-check the INA BK0910 closed end needle roller bearing against your specific housing pocket dimensions and confirm fit. If you’re switching from another brand’s needle bearing, send the current designation along with any clearance or precision suffixes printed on the existing part. We’ll respond with batch availability, lead time, and the documentation package that accompanies your shipment.
Frequently Asked Questions
Q: What does the BK suffix indicate on this needle roller bearing?
A: BK designates a drawn cup needle roller bearing with a closed end. The closed end acts as an integral seal and thrust retention face on one side, eliminating the need for a separate end cap in blind-bore transmission pockets.
Q: How can I confirm the INA BK0910 I received is genuine?
A: Each unit carries a traceable batch code readable through the INA official app QR verification pathway. We also supply a Certificate of Conformity linked to the production batch, and the packaging includes anti-counterfeit features consistent with authorized distribution.
Q: Can I substitute an open-end HK series bearing where a BK closed end is specified?
A: Not without adding a separate seal or end plate. The BK closed end provides contamination blocking and needle retention that an open-end design does not. Swapping to open without compensating for the missing closure invites debris ingress and needle migration in a shared-sump transmission.
Q: What cross-reference checks do you perform when matching another brand to the INA BK0910?
A: We align bore diameter, outside diameter, width, closed-end geometry, and precision class — not just the base number. A mismatch in any of these can cause fit issues or premature failure in the transmission housing.
Q: Is the P6 precision class sufficient for high-speed transmission use?
A: P6 provides the bore and OD tolerances needed for transmission shaft fits where gear mesh noise and running accuracy matter. For applications demanding tighter runout than P6 allows, we can discuss whether a higher precision needle bearing or an alternative bearing type better suits the position.
Secure Your INA BK0910 Batch with Full Traceability
Send us your transmission model or OEM part number, and we’ll confirm availability, match documentation to your import requirements, and quote a lead time you can plan around.
