SPL250 belongs to the later SPL heavy-duty joint family, which uses a bolted, greasable-for-life design in place of the older ring-retained sizes.
SPL joints are not interchangeable with the numeric series even where dimensions look close. Match the SPL designation exactly.
The SPL family was introduced as a heavier, longer-life alternative to the conventional numbered series in commercial driveline service. Retention is bolted and the joints are designed around extended service intervals.
Because SPL sizes do not cross-reference cleanly to the numeric series, always order by the SPL designation stamped on the part rather than by a dimensional match.