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2. Bottom bracket - Wikipedia

   en.wikipedia.org/wiki/Bottom_bracket

   The term "bracket" refers to the tube fittings that are used to hold frame tubes together in lugged steel frames [1] which also form the shell that contains the spindle and bearings; the term is now used for all frames, bracketed or not. There is some disagreement as to whether the word axle or spindle should be used in particular contexts.

3. Pillow block bearing - Wikipedia

   en.wikipedia.org/wiki/Pillow_block_bearing

   An early pillow-block with a whitemetal plain bearing Stainless-steel-sea-water-resistance-split-plummer-pillow-block-bearing-unit. A pillow block bearing (or plummer block) is a mounting used to support a rotating shaft with the use of bearings and various accessories. The assembly consists of a mounting block which houses a bearing. [1]

4. Bearing (mechanical) - Wikipedia

   en.wikipedia.org/wiki/Bearing_(mechanical)

   A ball bearing. A bearing is a machine element that constrains relative motion to only the desired motion and reduces friction between moving parts.The design of the bearing may, for example, provide for free linear movement of the moving part or for free rotation around a fixed axis; or, it may prevent a motion by controlling the vectors of normal forces that bear on the moving parts.

5. Steel frame - Wikipedia

   en.wikipedia.org/wiki/Steel_frame

   Steel frame structure Rectangular steel frame, or "perimeter frame" of the Willis building (at right) contrasted against the diagrid frame at 30 St Mary Axe (at center), in London. Steel frame is a building technique with a " skeleton frame" of vertical steel columns and horizontal I-beams , constructed in a rectangular grid to support the ...

6. Main bearing - Wikipedia

   en.wikipedia.org/wiki/Main_bearing

   The lower half of the main bearings are typically held in place by 'bearing caps' which are secured to the engine block using bolts. The basic arrangement is for each bearing cap to have two bolts, but some engines may have four or six bolts per bearing cap (often referred to as "four-bolt mains" or "six-bolt mains" engines).

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