When looking at stepper motor part numbers from Sanyo Denki SanMotion, you may see a P suffix at the end of your part number that isn’t explained on its datasheet, such as SS2421-5041P.
Confirmed by Sanyo Denki, the “P” suffix merely means the part was made in the Philippines.
Applicable part numbers
SH2141-5511P
SH2141-5541P
SH2145-5611P
SH2145-5641P
SS2421-5041P
SS2422-5041P
SS2501-8040P
SS2502-8040P
2300-SH2141-5511P-ND
2300-SH2141-5541P-ND
2300-SH2145-5611P-ND
2300-SH2145-5641P-ND
2300-SS2421-5041P-ND
2300-SS2422-5041P-ND
2300-SS2501-8040P-ND
2300-SS2502-8040P-ND