61928-MA (brass cage) bearing: complete specifications & equivalents

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-27

Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018)); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.

Cross references & equivalents

Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.

How the 61928-MA model number is decoded

In the 61900-series, the last two digits encode the bore: 61928 carries code 28 = 140 mm (code × 5). The envelope is 140×190×24 mm (5.512×7.48×0.945 in) with a 25.0 mm radial section height, C 66.3 kN, C0 72 kN and Pu 2.36 kN. The open 61928 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 5600 r/min, catalogue mass 2000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Do not preload 61928-MA to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.
• Assign interference to the rotating ring: on a conventional shaft-mounted 140 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.
• The MA suffix on 61928-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 2000 g quoted mass includes the heavier cage.
• Open 61928-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.
• Plan a relubrication interval for 61928-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
• Deep-groove geometry tolerates only minutes of misalignment; if the 190 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 61928-MA.
• Where two 61928 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.
• For positions that need relubrication, choose the open execution of 61928 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.