Value Collection JY4847869 Straight Flute Tap 13/16-20 Unef

Product Description

The VALUE COLLECTION JY4847869 is a straight flute bottoming tap designed for cutting internal threads in through-holes and blind holes where threads must extend close to the bottom. Manufactured from high-speed steel with a bright/uncoated finish, this tap produces 13/16-20 UNEF right-hand threads to a 3B class of fit. The H4 thread limit designation ensures the tap cuts within the appropriate tolerance range for functional threaded assemblies. With 4 flutes and a bottoming chamfer, it is suited for use in machine tapping and hand tapping operations where full thread depth near the bottom of a hole is required.

This tap is used in metalworking and machining applications where 13/16-20 UNEF extra-fine threads are specified. The UNEF thread form is common in aerospace, precision instrument, and thin-walled component applications where fine thread pitch improves clamping force and reduces the risk of stripping. The bottoming chamfer style makes it appropriate as a finishing tap after a plug or taper tap has been used to start the thread, particularly in blind-hole applications requiring maximum thread engagement.

Key Features

• 13/16-20 UNEF thread form with right-hand thread direction
• Bottoming chamfer for threading close to the bottom of blind holes
• High-speed steel construction for durability across a range of workpiece materials
• 3B class of fit for standard tolerance internal threads
• H4 thread limit for consistent, in-tolerance thread production
• 4-flute design provides chip clearance and cutting stability

Compatibility

Designed as an OEM-style replacement or direct-use tap for applications requiring 13/16-20 UNEF internal threads in metalworking, machining, and fabrication environments.

Installation Notes

This tap is installed by machinists and toolmakers using a tap wrench, tapping head, or CNC machine spindle. Always ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill diameter before threading. Apply cutting fluid appropriate to the workpiece material to extend tap life and improve thread finish. When using as a bottoming tap in a blind hole, follow a taper or plug tap first to avoid overloading the tool.