Value Collection MSC-04423489 Straight Flute Tap 3-48 Unc

Product Description

The VALUE COLLECTION MSC-04423489 is a straight flute tap designed to cut internal threads in through-holes and shallow blind holes where chip evacuation flows back through the flute. Built from high-speed steel (HSS) with a bright, uncoated finish, this tap cuts a 3-48 UNC thread profile and is ground to an H2 thread limit for consistent dimensional control. The plug chamfer, spanning approximately 3 to 5 threads, suits general-purpose tapping in a range of materials including mild steel, aluminum, and plastics. With an overall length of 1-13/16 inches and a thread length of 1/2 inch, it fits standard tap holders and drive adapters used in manual and machine tapping operations. Machinists, tool-and-die makers, and maintenance technicians are the primary users of this tap.

This tap is suited for threading small-diameter fastener holes in light manufacturing, repair, and maintenance applications. The 3-48 UNC coarse-thread designation is common in precision instrument work, electronics enclosures, and small mechanical assemblies where a No. 3 screw is specified. The straight flute design works best in through-holes or shallow blind holes where chips can be backed out or cleared with intermittent reversing. The right-hand thread direction is standard for conventional fastener engagement. Coolant-through capability is not included, so flood or brush-applied cutting fluid is recommended when tapping ferrous materials.

Key Features

• 3-48 UNC thread form for No. 3 coarse-thread applications in instruments and small assemblies
• High-speed steel construction provides adequate hardness and toughness for general-purpose tapping
• Plug chamfer (3-5 thread lead) balances starting ease with thread engagement depth
• H2 thread limit ensures 2B class of fit tolerance compliance for standard nut and fastener mating
• Bright, uncoated finish — no coating buildup to affect thread tolerance on small-diameter work
• 3-flute design offers good chip clearance relative to tap cross-section at this small diameter

Compatibility

Designed as an OEM-style replacement or direct-use tap for any application requiring a 3-48 UNC, 2B class of fit, plug chamfer straight flute tap in a standard tap holder or T-handle driver.

Installation Notes

This tap should be installed and driven by a licensed machinist or qualified maintenance technician using a calibrated tap holder, T-handle, or tapping head sized for the shank diameter. Always secure the workpiece before tapping and apply a suitable cutting fluid to reduce friction and heat buildup, particularly in ferrous materials. Back the tap out periodically to break and clear chips, preventing tap breakage in small-diameter holes. Follow shop safety practices and applicable OSHA machine-guarding requirements when operating drill presses or CNC equipment.