Value Collection JY74734138 Straight Flute Tap M28x1

Product Description

The VALUE COLLECTION JY74734138 is a straight flute tap designed for cutting internal metric fine threads in a bottoming application. Built from high-speed steel (HSS) with a bright, uncoated finish, this tap produces M28x1 threads to a 6H class of fit with a D5 thread limit. The bottoming chamfer allows threading close to the bottom of blind holes where standard or plug chamfer taps cannot reach. With 4 flutes and a right-hand thread direction, it is suited for use in manual tapping setups or rigid machine tapping operations. Machinists, toolroom technicians, and maintenance professionals working with metric fine fastener specifications will find this tap appropriate for production and repair tasks alike.

This tap is used when a precise M28x1 metric fine thread is required in ferrous and non-ferrous materials in a shop or field maintenance environment. The bottoming chamfer makes it the final tap in a two- or three-tap sequence for blind holes, following a taper or plug tap to establish the thread. It is appropriate for threading operations in automotive, industrial machinery, and equipment repair applications where metric fine thread pitches are specified.

Key Features

• M28x1 metric fine thread form for close-tolerance fastener applications
• Bottoming chamfer allows threading to the bottom of blind holes
• 4-flute straight flute design provides rigidity and chip control in through and blind holes
• 6H class of fit with D5 thread limit for standard metric tolerance requirements
• High-speed steel (HSS) construction for use across a broad range of workpiece materials
• Bright, uncoated finish — no coating buildup to affect thread tolerance
• Right-hand thread direction; compatible with standard tapping chucks and tap wrenches

Compatibility

Designed as a standard replacement or toolroom tap for any application requiring an M28x1 metric fine, 6H class of fit, bottoming chamfer straight flute tap in HSS.

Installation Notes

Install and operate this tap with a properly sized tap wrench or rigid tapping holder matched to the square drive. Always use cutting fluid appropriate for the workpiece material to extend tool life and improve thread finish. When tapping blind holes, use a taper tap first to establish the thread, then follow with this bottoming tap to complete threading to the required depth. Ensure the workpiece is securely fixtured and the tap is aligned axially with the drilled hole before applying torque.