Value Collection MSC-04919098 Straight Flute Tap 1-8 Unc

Product Description

The VALUE COLLECTION MSC-04919098 is a straight flute tap designed for cutting 1-8 UNC internal threads in through-holes and blind holes requiring a bottoming chamfer. Built from high-speed steel (HSS) with a bright, uncoated finish, this tap delivers reliable thread-forming performance in ferrous and non-ferrous materials. It features a left-hand thread direction, four flutes for efficient chip clearance, and an H4 thread limit for close-tolerance 3B class of fit applications. With a 2.5-inch thread length and an overall length of 5.125 inches, it accommodates standard tapping depths on large-diameter fastener applications. Machinists and tooling professionals use this tap in manual and CNC tapping operations where precision thread form is required.

This tap is suited for production machining, maintenance and repair operations, and fabrication environments where 1-8 UNC threads are required. The bottoming chamfer allows threading close to the bottom of a blind hole, making it appropriate for applications where full thread engagement depth is critical. The left-hand configuration makes it specific to left-hand threaded assemblies. Typical users include machinists, tool and die makers, and maintenance technicians working with large-diameter fasteners in steel, aluminum, cast iron, and similar workpiece materials.

Key Features

• 1-8 UNC thread form for large-diameter fastener applications
• Bottoming chamfer allows threading to near the bottom of blind holes
• Left-hand thread direction for left-hand threaded assemblies
• Four straight flutes provide efficient chip evacuation in shorter-chipping materials
• H4 thread limit holds tight tolerances for 3B class of fit
• High-speed steel construction offers durability across a wide range of workpiece materials
• Bright, uncoated finish suitable for use with cutting fluids

Compatibility

Designed as an OEM-style replacement or direct tooling option for machine shops and maintenance operations requiring 1-8 UNC left-hand straight flute taps with a bottoming chamfer and H4 thread limit.

Installation Notes

This tap should be installed and operated by qualified machinists or tooling professionals familiar with tapping operations. Ensure the workpiece is securely fixtured and the spindle is properly aligned before tapping to avoid tap breakage or thread distortion. Use an appropriate cutting fluid or tapping compound for the workpiece material to extend tap life and improve thread quality. For manual tapping, back off periodically to break chips; for machine tapping, verify the tapping head or CNC cycle is configured for left-hand rotation.