# HK Versus BK Cups When Space Is Tight

HK open-end cups need a hardened shaft race; BK closed cups stop axial oil wash but need extra length. Mixing them on a shared shaft is a classic warranty claim.

Use the PT reference charts to confirm bore, width, and load ratings side by side. For sizing and interchange notes, see needle roller cross reference and the full write-up on TFL Bearing needle charts.

If the housing is stamped steel, verify ovality before you press the cup. Buyers who need OEM-fit replacements can also open Read the needle roller charts before they freeze a drawing or RFQ.

Shandong TFL Bearing Co., Ltd keeps Portuguese product pages aligned with English engineering notes so global plants share one cross-reference language.