A 40-piece metallic tap and die set is a more compact, but still very useful, version of a tap and die kit. It’s ideal for a range of common threading tasks, from repairing damaged threads on bolts and holes to creating new ones in various metallic materials. What’s typically included in a 40-piece set: While the exact sizes and types might vary slightly between manufacturers, a 40-piece set generally focuses on the most commonly used sizes, often in both metric and/or SAE (imperial) measurements. Here’s a typical breakdown: Taps (Internal Threads): You’ll find a selection of taps to cut internal threads in holes. This usually includes: Taper Taps: For starting new threads. Plug Taps: For cutting threads deeper. A 40-piece set might include around 16-17 pairs of taps and dies, covering sizes like M3x0.5, M4x0.7, M5x0.8, M6x1.0, M8x1.25, M10x1.5, M12x1.75 for metric, and equivalent SAE sizes (e.g., 4-40 NC, 6-32 NC, 8-32 NC, 10-24 NC, 1/4-20 NC, 5/16-18 NC, 3/8-16 NC, 7/16-14 NC, 1/2-13 NC). Some sets may also include NPT (National Pipe Taper) sizes like 1/8″ NPT for pipe threads. Dies (External Threads): Corresponding dies for cutting external threads on rods or bolts. These often come in round or hexagonal shapes. You’ll typically find the same range of sizes as the taps. Wrenches and Holders: Tap Wrenches: Usually an adjustable long-handle tap wrench and a T-handle tap wrench for smaller taps. Die Holder/Wrench: To hold and turn the dies. Accessories: Screw Pitch Gauge: Essential for identifying the thread pitch of existing threads. Screwdriver: Often a small flat-head screwdriver for adjusting die holders or other components. Storage Case: A durable case (often blow-molded plastic) to keep all the pieces organized and protected.













