Stub shaft se obično prevodi s rukavac osovine.

rukavac
dio osovine ili vratila koji se oslanja na ležaj ili nepomični dio konstrukcije
http://struna.ihjj.hr/naziv/rukavac/10243/

Rukavci su oni dijelovi osovina i vratila kojima se oslanjaju na klizne ili valjne
ležaje ili na nepokretne dijelove. Rukavci koji se nalaze na kraju osovine/vratila se
nazivaju čelnim, a ostali unutarnjim.
http://www.riteh.uniri.hr/zav_katd_sluz/zvd_kons_stroj/kated...

Rukavac osovine
http://www.autoprikolice.hr/product.asp?product=rukavac-osov...

In common engineering parlance, a stub shaft is a short rotating shaft that extends, cantilevered out past its supporting bearings in the main structure of a power transmission subsystem.

Stub shafts are often used as input and/or output connections, which allows for a compact assembly where their short length provides just enough material for attachment of a coupling (usually splined or keyed) sized for the design loads of the system.

The size and position of the stub shafts are essentially the “interface definition” of a gearbox or other component, which can otherwise to a certain extent be considered as a black box where the internal implementation details are not important.
https://www.quora.com/What-is-a-stub-shaft

What a Tube Shaft Does
A tube shaft is a drive shaft component that is used with a slip yoke, which in turn allows for axial movement. Most tube shafts have blue colored splines. That blue color is often referred to as glidecoat, which is a nylon coating that is used to prevent premature wear of the part.
https://www.machineservice.com/products/driveline-parts/tube...

Stub shafts
https://www.hayescouplings.com/products/sae-stub-shafts/

P.S. Kad sam već istražio, vidio sam da se traži SR, a ne HR :-) Ali mislim da odgovara i na SR.