What size are the screws in the sub-base of the BLACK+DECKER RP250 router? Wilson December 23, 2020 20:30 Updated Follow The six sub base screws are M4x12. The two longer ones (screws into the columns) are M5x25. Related articles Where can I obtain a copy of the instruction manual BLACK & DECKER HVLP Paint Sprayer, model # BDPH400? Comments 0 comments Please sign in to leave a comment.