Milwaukee High Carbon Steel SAE Straight Plug Tap 5/8-18 NF

Milwaukee High Carbon Steel SAE Straight Plug Tap 5/8-18 NF is a purpose-built tool for precise internal threading in metalworking projects. Crafted from high carbon steel and finished in black oxide, this plug tap delivers durable performance for a wide range of materials, from mild steel to cast iron.

Designed for finishing internal threads, the straight plug tap creates clean, consistent 5/8-18 NF threads where you need a strong fastener fit. The compact 3.75-inch length makes it versatile for through-holes and shorter workpieces, and it's sold as a single carded piece for easy retail display and immediate use in the shop.

• Durable construction: High carbon steel construction provides rigidity and wear resistance for repeated tapping work.
• Accurate National Fine threading: 5/8-18 NF is a common fine-thread size, delivering tighter tolerances and stronger engagement than coarse threads.
• Straight plug tap design: Optimized for finishing internal threads in metal, ideal after an initial roughing pass to achieve accurate depth and fit.
• Black oxide finish: Helps resist corrosion and provides smoother cutting action with proper lubrication.
• Compact, practical packaging: 1-piece carded Tap ready for use in portable tool kits or workshop drawers.
• No drill bit included: Use with your existing drill/press setup and tapping fluid for best results.

Practical use cases and best practices

Ideal for professionals and DIYers working on automotive repairs, equipment maintenance, or metal fabrication tasks that require precise internal threads in steel or iron. This Milwaukee tap is well-suited for finishing threads after a roughing pass, repairing stripped threads, or creating new, repeatable fastener points in metal components.

• Use with a tap wrench or T-handle and appropriate tapping oil or cutting fluid to reduce heat and enhance chip removal.
• Keep the tap aligned with the hole to prevent cross-threading; back the tap off periodically to break and clear chips.
• Pair with compatible dies and tools in your toolkit for a full threading solution on steel, cast iron, or alloys supported by high carbon steel taps.

Whether you're outfitting a busy machine shop or tackling a home workshop project, the Milwaukee High Carbon Steel SAE Straight Plug Tap 5/8-18 NF is built to deliver precise, durable internal threads with a finish that stands up to repeated use. Add it to your tapping arsenal and approach every job with confidence—clean threads, dependable engagement, and a finish you can trust.