INA HK0812 Drawn Cup Needle Roller Bearing Wholesale

Traceable Channel Sourcing — Every INA HK0812 drawn cup needle roller bearing ships with lot-level documentation traced back to the manufacturer's authorized distribution network.

Technical Specifications

Suffix availability and exact origin may vary; confirm specific requirements with the supply chain documentation at the time of purchase.

Application Suitability

What Happens When Needle Count and Hardness Don't Match the Data Sheet

A single missing roller in the complement can shift load distribution enough to trigger spalling within the first maintenance cycle.

On high-cycle power tool lines and compact motor assemblies, the INA HK0812 needle roller bearing runs at speeds where every needle shares the radial load equally. Counterfeit or sub-spec batches often arrive with fewer rollers or softer needle elements that pass visual inspection but deform under sustained cyclic stress. The cage pockets wear unevenly, generating debris that migrates into adjacent assemblies. Procurement engineers who matched the base designation without verifying the full internals specification have reported premature field breakdowns within weeks of installation [NEED_CITE: common failure modes in drawn cup needle bearings per ISO 15243].

Matching the HK0812 to Compact High-Speed Shafts

The drawn cup geometry of the INA HK0812 needle roller bearing provides a minimal radial envelope while maintaining high load density across the needle complement. In motor and gearbox applications where shaft diameter is constrained to 8 mm, this bearing absorbs radial forces from gear mesh or belt tension without requiring a* as the raceway. When sourcing replacement units for OEM equipment, cross-referencing the bore, outer diameter, width, and cage material together ensures the substitute matches the original load capacity and speed behavior. Our cross-brand interchange comparison checks these parameters simultaneously rather than matching on base number alone.

Thermal and Lubrication Demands in Enclosed Assemblies

Needle roller bearings in gearbox and motor housings operate with limited airflow, meaning frictional heat builds faster than in open-frame applications. The open design of the HK0812 allows lubricant to flow through the needle complement during initial fill, but it also means the housing must provide adequate sealing against contaminant ingress. Grease selection becomes critical: a lithium-complex grease with appropriate base oil viscosity maintains film thickness at the needle-to-shaft contact zone without churning losses at 19000 r/min limiting speed. Temperature swings inside sealed gearboxes can affect the shaft-to-cup interference fit, so engineers must verify that thermal expansion does not reduce the already-tight radial clearance to zero. Installation practices matter equally — pressing the drawn cup into a housing with insufficient chamfer guidance can collapse the thin outer shell [NEED_CITE: drawn cup needle bearing installation practices and housing tolerances per ISO 3245].

Why GCr15 Steel and Steel Cage Matter Here

The GCr15 chrome steel used in the INA HK0812 needle roller bearing provides through-hardened needle elements that resist brinelling under repeated load reversals typical in oscillating motor applications. The steel cage maintains precise needle spacing at high rotational speeds, preventing roller-to-roller contact that would generate localized heat and accelerated wear. Compared to polyamide cages, steel retains dimensional stability across a wider temperature range — important when the bearing sits inside a gearbox where ambient oil temperature can fluctuate during startup and shutdown cycles. The open-end drawn cup design (HK series designation) means no integrated seals, so the surrounding housing design must account for contamination exclusion and lubricant retention independently.

The Hidden Cost of a Wrong Needle Bearing

Specifying by base number alone leaves clearance, needle complement, and cage material unverified — and each mismatch shortens service life in ways that compound across a production line.

A drawn cup bearing with incorrect needle hardness will not fail catastrophically at first; instead, it generates fine metallic particles that contaminate the lubricant and accelerate wear in adjacent components. In high-volume motor manufacturing, this translates into warranty claims that trace back to a single bearing lot. ISO 281 provides the framework for calculating rated bearing life, but that calculation assumes correct material properties, proper lubrication, and verified internal geometry — none of which are guaranteed when the supply chain lacks traceability [NEED_CITE: bearing life calculation factors per ISO 281]. Counterfeit units with cloned markings pass casual receiving inspection, yet the soft inner needles deform within the first few hundred operating hours. The cost of unplanned downtime on an assembly line, or a field return from a power tool customer, far exceeds the unit price difference between a verified and an unverified bearing.

How Verification Works Before Shipment

Our sourcing model pulls the INA HK0812 needle roller bearing through authorized distributor channels, meaning each batch carries documentation that traces back to the manufacturer's production facilities. Cross-reference verification covers bore diameter, outer diameter, width, cage type, and needle material specification — not just the printed designation. For buyers replacing an OEM-specified bearing, we provide interchange comparison across SKF, NSK, FAG, TIMKEN, NTN, and KOYO equivalents, matched on all relevant suffixes and internal parameters. Authenticity verification includes QR code pathways via the brand's official application and Certificate of Conformity with batch-level lot traceability. Country-of-origin documentation accompanies each shipment for import compliance and buyer verification requirements.

Documentation & Authenticity

• Certificate of Conformity issued against the specific HK0812 batch, confirming GCr15 material grade and dimensional conformance to ISO 3245 tolerances
• Lot traceability documentation linking each shipment to the manufacturer's production run for downstream audit requirements
• QR code verification pathway through INA's official application to confirm bearing authenticity before installation
• Country-of-origin documentation prepared for customs clearance and buyer import records
• Dimensional inspection report verifying bore, OD, and width within P0/P6 tolerance bands before dispatch

Storage, Handling & Mounting

• Keep the HK0812 in its original sealed packaging until the moment of installation; the open-end drawn cup design offers no seal protection against humidity or particulate contamination during storage
• Store in a climate-controlled environment with stable temperature to prevent condensation inside the drawn cup shell, which has minimal wall thickness and is susceptible to surface corrosion
• During mounting, apply press force to the outer cup only — never transmit installation force through the needle rollers or cage, as this will damage the steel cage pockets and compromise needle alignment
• Verify housing bore tolerance and chamfer geometry before pressing the 12 mm OD cup into place; inadequate chamfer guidance can collapse the thin-walled drawn cup shell
• Lubricate the needle complement and shaft raceway before first rotation; the open design means no factory grease fill is retained, making initial lubrication the installer's responsibility

Request a Quote or Technical Review

Share your application parameters — load, speed, operating temperature, and housing design — so we can verify the INA HK0812 needle roller bearing matches your requirements or recommend a cross-brand equivalent. If you are replacing an OEM-specified bearing, provide the equipment model number for a full interchange check including cage material and clearance alignment. Request the documentation package and country-of-origin confirmation before placing your order. Our team will confirm batch availability and provide lead time within one business day.

Frequently Asked Questions

Q: How can I verify that an INA HK0812 is genuine before installation? A: Each bearing sourced through authorized channels carries a QR code that links to INA's official verification application. Combined with the Certificate of Conformity and batch traceability documentation, this provides a reliable authenticity check before the bearing enters your inventory or assembly line.

Q: What should I check when cross-referencing the HK0812 to another brand? A: Beyond the basic 8 mm bore, 12 mm OD, and 12 mm width, verify that the substitute uses a steel cage, matches the needle complement count, and carries the same precision class. A mismatch in any of these parameters changes load distribution and limiting speed behavior in the application.

Q: Does the HK0812 come pre-lubricated? A: No. The open-end drawn cup design (HK series) does not include integrated seals or factory grease fill. Lubrication must be applied during installation, and the housing must provide adequate sealing for the operating environment.

Q: What precision class is available for this bearing? A: The INA HK0812 is available in P0 and P6 precision grades, which cover standard industrial tolerance requirements for motor and gearbox applications. Confirm the required grade based on your application's running accuracy and speed demands.

Q: Can I get country-of-origin documentation for import purposes? A: Yes. Origin documentation, HS code information, and customs support materials are included with each shipment to facilitate import clearance and buyer verification in the destination country.

Get Your INA HK0812 Quote Submit your application details or OEM equipment number to confirm the correct specification and receive batch availability with documentation.