Square steel keys resist failure by shear and crushing effectively and are normally fabricated from _______________ steel stock?
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Answer: B. Cold rolled mild
Explanation
Square keys for power transmission are typically manufactured from cold-rolled mild steel stock. Cold-rolled steel provides tight dimensional tolerances and smooth surface finishes required for tight keyways. Mild steel offers sufficient strength to resist shear and crushing failures under normal operational torques. Machine keys are removable fasteners used to secure rotating elements like gears and pulleys to shafts. Cold rolling increases yield strength and dimensional accuracy compared to hot rolling manufacturing methods. Key stock is produced in long bars cut to length as needed for various mechanical drive assemblies.
Industrial gearbox assembly requires precisely fitted square keys to transmit motor torque reliably. Electric motor shafts feature keyways machined to accept cold-rolled steel keys for pulley attachments. Maintenance engineers replace sheared drive keys with standard cold-rolled mild steel stock replacements. Hot rolled mild steel lacks the tight dimensional tolerances required for precision machine keyways. Forged steel is unnecessary for standard key stock since cold-drawn bar provides superior surface finish. Machinable stainless steel is only used when corrosive environments demand specialized non-rusting key stock.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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