مكون خارجي لمحمل أسطواني مدبب يوفر سطح اتصال للعناصر الدوارة للمحمل.
0.1250 inches nominal backface corner radius, 8.3750 inches nominal outside diameter, 2.1250 inches nominal overall width, steel overall material, medium heavy series,7.4375 in. s shoulder dia,7.9375 in. o shoulder dia special features