Value Collection JY4872289 Straight Flute Tap 1-3/8-27 Uns

Product Description

The VALUE COLLECTION JY4872289 is a straight flute bottoming tap designed for cutting internal threads in through-holes and blind holes where the thread must extend close to the bottom. Manufactured from high-speed steel with a bright, uncoated finish, this tap produces 1-3/8-27 UNS right-hand threads to a 3B class of fit. The H4 thread limit ensures dimensional accuracy within the specified tolerance range. With six flutes, this tap provides excellent chip clearance and stable cutting action during threading operations in metal and similar materials. Overall length is 4 inches.

This bottoming tap is suited for production and maintenance machining environments where a full thread depth in a blind hole is required. The 1-3/8-27 UNS thread form serves specialty fastening applications that fall outside standard UN series pitches. Machinists and tooling professionals use this tap on manual lathes, drill presses, milling machines, and CNC tapping equipment where a rigid or floating tap holder is used with appropriate feed rate control.

Key Features

• Bottoming chamfer allows threading to within 1-2 threads of the bottom of a blind hole
• Six flutes provide stable cutting and distribute wear across multiple cutting edges
• High-speed steel construction offers toughness and resistance to heat generated during tapping
• Bright, uncoated finish suited for use with cutting fluid on a wide range of workpiece materials
• H4 thread limit maintains tight dimensional control for 3B class of fit requirements
• Right-hand thread direction compatible with standard tapping equipment and holders

Compatibility

Designed as a direct-use bottoming tap for applications requiring 1-3/8-27 UNS internal threads in metal workpieces where 3B class of fit tolerance is specified.

Installation Notes

Tap installation should be performed by a qualified machinist following standard tapping procedures. Always use an appropriate cutting fluid for the workpiece material to reduce friction and extend tool life. Ensure the workpiece is securely fixtured and that the tap is properly aligned with the drilled hole before engagement to prevent tap breakage. Follow OSHA and shop safety guidelines when operating tapping equipment.