Value Collection JY4862157 Straight Flute Tap 1-1/8-16 Uns

Product Description

The VALUE COLLECTION JY4862157 is a straight flute tap designed to cut 1-1/8-16 UNS internal threads in through-holes and blind holes requiring a bottoming chamfer. Built from high-speed steel (HSS) with a bright, uncoated finish, it delivers consistent thread cutting in a wide range of ferrous and non-ferrous materials. The tap features four flutes and a right-hand thread direction, with an overall length of 4 inches and a thread limit of H4. The 3B class of fit designation makes it suitable for standard fastener applications where moderate tolerance control is required. Machinists and tool-and-die technicians are the primary users of this tap.

This tap is suited for production and maintenance machining environments where threads must be cut close to the bottom of a blind hole. The bottoming chamfer — typically 1 to 2 threads of lead — allows thread engagement to begin within one to two thread pitches of the hole bottom, making it the correct choice when full thread depth near a shoulder or closed end is required. It is appropriate for use in manual tapping, tapping heads, and low-speed CNC tapping cycles on mill or drill press setups where coolant-through tooling is not required.

Key Features

• 1-1/8-16 UNS thread form for unified national special thread applications
• Bottoming chamfer allows threading close to the bottom of blind holes
• 4-flute straight design provides rigidity and stability during the cut
• High-speed steel construction for durability across a range of workpiece materials
• H4 thread limit for controlled pitch diameter in 3B fit applications
• Right-hand thread direction, bright uncoated finish — no coolant-through required

Compatibility

Designed as an OEM-style replacement or direct-use tap for standard manual and CNC tapping operations requiring 1-1/8-16 UNS internal threads with a 3B class of fit.

Installation Notes

Installation should be performed by a qualified machinist following standard tapping procedures. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill diameter for a 1-1/8-16 UNS thread before use. Apply appropriate cutting fluid for the workpiece material to extend tool life and improve thread finish. Back the tap off periodically to break chips and prevent tap breakage, particularly in deeper blind holes.