Value Collection MSC-04489316 Straight Flute Tap 1-1/8-7

Product Description

The VALUE COLLECTION MSC-04489316 is a straight flute bottoming tap designed for cutting internal threads in through-holes and blind holes where full thread depth close to the bottom is required. Built from high-speed steel with a bright, uncoated finish, this tap produces 1-1/8-7 UNC right-hand threads and carries a 3B class of fit for standard tolerance applications. It runs 4 flutes and an H4 thread limit, making it a practical choice for machining shops and maintenance operations that need reliable, consistent thread quality without specialty coatings.

This tap is suited for use in general machining environments where UNC coarse-thread fastener holes are required in ferrous and non-ferrous materials. The bottoming chamfer — typically 1 to 2 threads — allows threading to the bottom of blind holes, which is a common requirement in fixture work, tooling plates, and machine component repair. At 5.75 inches overall length, it is compatible with standard tap handles and machine tap holders used in manual or light CNC tapping operations.

Key Features

• Bottoming chamfer for threading to the bottom of blind holes
• 1-1/8-7 UNC thread size with right-hand thread direction
• 4 straight flutes for chip evacuation in through and shallow blind holes
• H4 thread limit for 3B class of fit tolerancing
• High-speed steel construction for use across a broad range of workpiece materials
• Bright, uncoated finish — no coating buildup that can affect thread tolerance

Compatibility

Designed as a standard OEM-style replacement or production tap for use wherever 1-1/8-7 UNC bottoming taps are specified in manual tapping, drill press, or light machine tapping setups.

Installation Notes

This tap should be installed in an appropriate tap handle or machine holder rated for the shank size before use. Always ensure the workpiece is securely fixtured and use cutting fluid appropriate to the workpiece material to prolong tool life and improve thread finish. Apply consistent, controlled torque when hand-tapping to avoid tap breakage — oversized or misaligned pilot holes are the most common cause of tap failure at this diameter. Dispose of worn taps per shop safety procedures; damaged high-speed steel tools should not be reground without proper equipment.