Value Collection JY4861274 Straight Flute Tap 1-1/16-20 Uns

Product Description

The VALUE COLLECTION JY4861274 is a straight flute tap designed for cutting internal threads in through-holes and blind holes where a bottoming chamfer is required. Built from high-speed steel (HSS) with a bright, uncoated finish, this tap cuts 1-1/16-20 UNS threads to a 3B class of fit with an H4 thread limit. It features four flutes and a right-hand thread direction, with an overall length of 4 inches. This tap is suited for machinists and toolroom technicians working on precision threading applications where tight tolerance and clean thread form are critical.

This tap is used in machine shop and maintenance environments for producing 1-1/16-20 UNS internal threads in a variety of materials compatible with HSS tooling. The bottoming chamfer allows threading close to the bottom of a blind hole, making it appropriate for applications where full thread depth near the base is required. It is commonly used in manual tapping operations and compatible tapping heads on drill presses, mills, and CNC machines running low-speed tapping cycles.

Key Features

• 1-1/16-20 UNS thread form with right-hand cut
• Bottoming chamfer for threading close to the bottom of blind holes
• 4-flute design provides good chip support and thread form stability
• High-speed steel construction withstands heat generated during tapping
• 3B class of fit with H4 thread limit for standard precision tolerance requirements
• Bright, uncoated finish suitable for general-purpose threading applications

Compatibility

Designed as a standard replacement or toolroom tap for manual and machine tapping operations requiring 1-1/16-20 UNS internal threads in materials appropriate for HSS tooling.

Installation Notes

Tapping should be performed by a qualified machinist following established shop safety procedures. Ensure the workpiece is securely fixtured before beginning the tapping operation. Apply appropriate cutting fluid to reduce heat and extend tool life. Never exceed the recommended speed for the material being tapped, and back the tap off periodically to break chips and prevent tap breakage in blind-hole applications.