AKASAKA.GH-R3T-108.520 MECHANICAL SEAL AKASAKA.GH-R3T-108.524 SPRING SEAT CARBON STEEL SS400 AKASAKA.GH-R3T-108.531 O-RING RUBBER VITON AKASAKA.GH-R3T-108.532 OIL SEAL RUBBER NBR AKASAKA.GH-R3T-108.540 BALL BEARING SUJ2