不含滾珠軸承、滑動軸承或滾柱軸承的單件或多件式組件。其設計旨在滿足各種或特定的安裝條件。對於帶有軸承的組件,請參閱滾珠軸承單元;滑動軸承單元;以及滾柱軸承單元。
2.760 inches nominal base length, 7.500 inches nominal center to center distance between mounting holes along width, 4.000 inches nominal height from bottom of base to bore centerline, 2.8470 inches minimum and 2.8480 inches maximum bore diameter, 4.000 inches nominal base thickness