Encyclopedia Of Screws, Nuts, Bolts & Washers






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    • Software used: Free cad (Opensource)
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    • Relevant Material: "Screws, nuts, bolts, and washers are fundamental fasteners for joining materials, with screws creating their own threads or mating with existing ones (tapered), bolts (non-tapered) pairing with a nut for clamping, and nuts (internal threads) securing bolts, while washers spread load and prevent damage/loosening. They differ in application: screws often for wood/metal (wood, sheet metal), bolts for heavy-duty, aligned joining (hex, carriage), with various types of nuts (hex, cap) and washers (flat, lock) for specific needs, forming secure assemblies. 
      Screws
      • Definition: A threaded fastener that forms its own mating thread or engages with a pre-tapped hole as it's turned.
      • Types: Wood screws (tapered for wood), machine screws (for tapped holes), sheet metal screws (sharp point, full thread), self-drilling (with a drill bit tip).
      • Function: Versatile for wood, metal, plastic; creates strong hold by cutting into material. 
      Bolts & Nuts
      • Definition: A bolt has external threads and a head, designed to pass through aligned holes; a nut has internal threads that match the bolt.
      • Function: Creates tension and clamps objects together; often used with washers.
      • Types: Hex bolts (common, six-sided head), carriage bolts (smooth, square neck for counter-rotation).
      • Nuts: Hex nuts (standard), lock nuts (prevent loosening), cap nuts (decorative/protective). 
      Washers
      • Definition: A thin, flat ring placed under a nut or bolt head.
      • Function: Distributes load over a larger area, prevents surface damage (crushing), reduces friction, and helps keep fasteners tight (lock washers).
      • Types: Flat (general use), lock (spring action), fender (large outer diameter for soft materials). 
      Key Differences & Applications
      • Screws vs. Bolts: Screws are often self-tapping or used in pre-tapped holes; bolts usually go through clearance holes and are tightened with a nut.
      • When to Use: Use screws for wood/sheet metal; use bolts/nuts for structural connections requiring high clamping force (e.g., machinery, framing).
      • Assembly: A typical assembly uses a bolt, a washer (under the head), through materials, then another washer (optional), and a nut, with a final washer/lock washer against the nut. .. (Google)
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