Milwaukee High Carbon Steel SAE Straight Plug Tap 4-40 NC

Introducing the Milwaukee High Carbon Steel SAE Straight Plug Tap 4-40 NC—a precision tool designed to deliver clean, accurate internal threads in metalworking projects. Built from high carbon steel and finished in black oxide, this plug tap is engineered for durability and dependable performance when you need small, reliable fastener threads.

• Material: High carbon steel for enhanced wear resistance and long life in demanding tapping tasks
• Style and size: Straight plug tap in 4-40 NC for precise internal threading in a variety of metals
• Finish: Black oxide coating provides modest corrosion resistance and reduced galling between the tap and workpiece
• Packaging: Carded packaging for easy retail display and quick identification
• Drill bit included: No; drill bit not included—please source the appropriate pilot size separately for your project
• Usage: Ideal for metalworking applications where compact, reliable internal threads are required, including small hardware, enclosures, and precision components

Why this Milwaukee tap stands out

Milwaukee’s high carbon steel construction offers superior wear resistance compared to lighter-duty taps, making it a trustworthy choice for both professional shops and serious hobbyists. The straight plug design ensures straightforward alignment and consistent thread cutting, which is especially important when working in tight spaces or with thinner materials. The 4-40 NC thread format is a staple for small fasteners, widely used in electronics housings, instrument panels, and precision assemblies.

Practical use cases

Use this tap when you need to create or repair internal threads for small machine screws. It’s well-suited for aluminum, mild steel, and brass workpieces where a clean, accurate 4-40 thread is critical. Pair it with a compatible tap wrench or handle and the appropriate pilot drill size (not included) to achieve reliable results in a single setup.

Tips for optimal results

• Lubricate generously with tapping fluid or cutting oil to reduce friction and extend tap life
• Keep the tap square to the hole to ensure true, straight threads
• Turn slowly and steadily; back off occasionally to break and clear chips
• Cool and clean the workpiece after tapping to prevent galling and residue buildup

This tap is a purpose-built tool for dedicated metalworking tasks that require precise 4-40 internal threads. With Milwaukee’s reputation for durability and exacting standards, it’s a dependable choice for assembling small components where secure, accurate threading matters most.