Allen bolts (Hex bolts) are tightened using a hex key (Allen key). For proper fastening, the key size must perfectly match the bolt head. Using the wrong size can round the head, damage the tool, and reduce tightening accuracy. Key Points to Know: Each Allen bolt has a specific internal hex dimension. Always use the exact key size, especially in high-torque areas. Avoid worn or rounded keys to maintain grip. A correct fit ensures clean torque transfer and longer bolt life. Professional Tip: If a bolt head begins to round, stop immediately. Switch to a fresh, sharp hex key or use penetrating oil before re-tightening. Prevention is always easier than extraction. #AllenBolt #HexKey #MechanicalFasteners

Here’s a clear comparison between the old World Trade Center (WTC 1) and the new One World Trade Center (often called the Freedom Tower): 🏙 Old WTC 1 (North Tower) Official Name: World Trade Center 1 (North Tower) Completed: 1972 Height (roof): 1,368 feet (417 meters) Height (with antenna): 1,728 feet (527 meters) Floors: 110 Destroyed: September 11, 2001 🗽 New WTC 1 (One World Trade Center / Freedom Tower) Completed: 2013 Height (architectural top / spire): 1,776 feet (541 meters) (Symbolic number representing the year 1776 — U.S. independence) Height (roof): 1,368 feet (417 meters) — the same as the old North Tower’s roof height. Floors: 104 (plus mechanical and observation levels) ✅ Quick Summary: Both towers reach 1,368 ft to the roof, but the new WTC 1’s spire makes it the tallest building in the Western Hemisphere at 1,776 ft. The old North Tower was slightly shorter if you compare total height (its antenna wasn’t part of the official architectural height).

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