INA BK2216 Closed End Needle Bearing 22x28x16mm P6

Genuine INA Sourcing — every BK2216 shipment arrives with traceable lot documentation from authorized distributor channels, verified through INA's official authentication tools before dispatch.

Technical Specifications

Note: The HK2216 is the open-end variant of this bearing series; confirm whether your housing requires a closed or open end before finalizing the order.

Application Suitability

When a Drawn Cup Wall Decides Whether a Gearbox Lives or Dies

The closed-end cup is not just a seal — it is the structural backbone of the BK2216.

A common mistake we see with drawn cup needle bearings is treating the BK and HK series as interchangeable because the bore and width match. The INA BK2216 needle roller bearing carries a closed end that serves double duty: it retains grease and blocks contaminant ingress from one side, but it also adds axial locating capability that an open-end HK2216 simply does not provide. When a maintenance engineer swaps in an open-end part without checking the housing shoulder design, the needles can walk axially under vibration, and the cage follows. That failure mode shows up weeks later as scoring on the shaft journal — well after the machine is back in production and the installer has moved on to the next job. [NEED_CITE: drawn cup needle bearing failure modes per ISO 15243]

Matching the INA BK2216 to Compact Drivetrain Environments

This bearing thrives where radial space is tight but load capacity cannot be compromised. The 22×28×16 mm envelope gives you a high needle count in a slim cross-section, which matters in transmission assemblies and small gearboxes where every millimeter of housing wall counts. The P6 precision class keeps bore and OD tolerances tight enough for reliable press-fit behavior without requiring matched housing bores ground to special limits. In our cross-reference work, we have seen procurement teams pull HK2216 open-end stock for applications that specifically need the closed end to act as an axial stop — always verify the housing design before substituting.

Operating Conditions That Push Drawn Cup Bearings to Their Limits

The GCr15 steel construction handles the HRC 58-62 surface hardness range needed for rolling contact fatigue resistance, but the drawn cup itself is relatively thin-walled compared to machined outer rings. That means housing bore roundness and surface finish matter more here than with heavier-section bearings. In agricultural or mining-adjacent equipment where dust and moisture are constant, the closed end provides one sealed face, but the open side still depends on the application's external seal design. Temperature swings common in outdoor equipment can affect the press-fit retention force; thermal cycling gradually relaxes interference fits in aluminum housings faster than in cast iron. Relubrication intervals depend entirely on whether the open side is fitted with a supplementary seal — without one, contamination shortens grease life noticeably. [NEED_CITE: drawn cup needle bearing housing tolerance requirements per DIN 618-1]

Reading the Specs That Actually Matter for BK2216

The P6 precision class on this INA BK2216 needle roller bearing governs bore diameter and OD tolerances to tighter bands than standard P0, which directly affects how the bearing seats in the housing during press-fit installation. Too loose, and the cup spins under load — a failure we have seen crack open gearboxes in the field. Too tight, and the thin drawn cup wall deforms inward, reducing internal clearance and generating heat. The GCr15 material (equivalent to SAE 52100 / 100Cr6) provides through-hardening characteristics that maintain raceway hardness across the full depth of the contact zone, not just the surface. The 16 mm width with a 22 mm bore gives a length-to-bore ratio that favors load distribution over the full needle length, reducing edge loading on the shaft journal.

What a Wrong Substitution Really Costs the Maintenance Budget

An incorrectly specified drawn cup bearing rarely fails immediately. The damage accumulates: micro-movement in a loose housing bore wears the cup OD, contamination enters past a missing external seal, and the cage begins to show wear patterns that a routine vibration check will not catch until the needles themselves start spalling. When that failure finally stops production, the cost is not just the bearing — it is the shaft journal regrind, the housing bore sleeving, the unplanned line stoppage, and the expedited freight on replacement parts. ISO 15243 catalogs these failure progressions in detail, and a significant share of them trace back to selection errors made at the procurement stage, not installation mistakes. [NEED_CITE: economic impact of unplanned bearing-related downtime in industrial plants]

How We Keep the INA BK2216 Supply Chain Transparent

Every INA BK2216 needle roller bearing we ship originates from authorized distributor channels — not from open-market traders where lot mixing and repackaged counterfeits circulate. We provide batch-level traceability that ties back to the manufacturer's production records, and the bearings carry authentic INA markings that can be cross-checked through official verification tools. Our cross-reference database does not just match base numbers; it checks the closed-end versus open-end distinction, cage material, and precision suffix so that substitutions between INA, SKF, and other brands are technically sound. When you need country-of-origin documentation for customs clearance or a certificate of conformity for a plant audit, those documents ship with the order, not as an afterthought.

Documentation & Authenticity

• INA Certificate of Conformity tied to the specific production lot of your BK2216 shipment, not a generic brand certificate
• Material test report confirming GCr15 / 100Cr6 chemical composition and through-hardening heat treatment compliance
• Dimensional inspection data covering bore diameter, OD, and width tolerances against P6 class limits per ISO 492
• QR code verification pathway using INA's official mobile application to confirm authenticity on arrival
• Country-of-origin certificate prepared for your import documentation package, including HS code classification support

Storage, Handling & Mounting

• Keep the BK2216 in its original sealed packaging until the moment of installation; the thin drawn cup wall is vulnerable to corrosion pitting that becomes a stress riser under load
• Handle with clean lint-free gloves — fingerprint acids etch the GCr15 raceway surface, and the closed-end cup base is especially difficult to clean once contaminated
• Press-fit using a sleeve that contacts only the outer cup OD, never the closed end face; driving force on the cup base will collapse the thin wall and distort the needle path
• Verify housing bore roundness and surface finish before mounting; DIN 618-1 specifies tighter housing tolerances for drawn cup bearings than for machined-ring equivalents
• If supplementary sealing is needed on the open side, install it before pressing the bearing home — accessing the open face afterward means disassembly

Getting Your BK2216 Specification Right Before You Commit

Share your operating parameters — shaft speed, load type, housing material, and whether the application needs the closed end as an axial locating surface — so we can confirm this exact suffix configuration fits your machine. If you are working from an OEM equipment number rather than a bearing part number, send it over and we will cross-reference against our database to verify the closed-end requirement. Request the documentation package and lot availability check early in your planning cycle, especially if this is a first-time order or a substitute for a previously open-end HK2216 installation.

Frequently Asked Questions

Q: How do I confirm that my BK2216 bearing is genuine INA product? A: Check the markings on the cup surface against INA's official product documentation, then scan the packaging QR code through INA's verified mobile application. We supply each shipment with batch-level traceability documents that link back to authorized distributor records. Counterfeit drawn cup bearings often have shallow or laser-etched markings rather than the manufacturer's standard stamping depth and font.

Q: Can I substitute an HK2216 open-end bearing in place of the BK2216 closed end? A: Only if the housing design provides an independent axial locating shoulder on the side where the BK2216 closed end would normally sit. The open-end HK2216 has no axial retention capability on that face, and the needles can migrate out of position under vibration. Always verify the housing drawing before cross-referencing between open and closed variants.

Q: What installation method is recommended for drawn cup needle bearings like the BK2216? A: An arbor press with a fitting sleeve sized to contact only the outer cup OD. Never hammer directly on the bearing or apply force through the closed end face. The housing bore should be clean, dry, and within the tolerance band specified in DIN 618-1 — drawn cup walls are thin and will conform to bore irregularities rather than bridge them.

Q: Does the BK2216 require relubrication after installation? A: The closed end retains the factory grease charge on one side, but the open side is exposed unless your application includes a supplementary seal. In dusty or wet environments, plan for relubrication at intervals appropriate to the contamination level, and use a grease compatible with the original factory fill to avoid additive conflicts.

Secure Your BK2216 Supply With Verified Documentation

Send us your equipment parameters or OEM reference number, and we will confirm the correct closed-end specification, cross-reference alternatives if needed, and quote with full traceability documentation.